| Dec 31, 2010 | Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net Income/(Loss) | 476 | 197 | 579 | -352 | 132 | -891 | -2,337 | 268 | 4,441 | 510 | 2,187 | 1,221 | -202 | 1,125 |
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| Equity in earnings of unconsolidated affiliates, net of distributions | 19 | -9 | -2 | -84 | -49 | -54 | -55 | -46 | -14 | -45 | -20 | -7 | 6 | 13 |
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| Depreciation, Amortization and Accretion, Net | - | - | - | - | - | - | - | 459 | 373 | 435 | 785 | 634 | 1,127 | 1,071 |
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| Capitalized Contract Cost, Amortization | - | - | - | - | - | - | - | - | - | - | - | - | - | 332 |
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| Accretion of asset retirement obligations | - | - | - | - | - | - | - | - | 51 | 45 | 30 | 55 | 27 | 34 |
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| Provision for credit losses | 54 | 59 | 45 | 67 | 64 | 48 | 68 | 85 | 95 | 108 | 698 | 11 | 251 | 314 |
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| Amortization of nuclear fuel | 40 | 39 | 39 | 36 | 46 | 49 | 51 | 48 | 52 | 54 | 51 | 54 | 47 | - |
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| Amortization of Debt Issuance Costs and Discounts | 32 | 32 | 31 | 33 | -12 | 3 | 60 | 29 | 26 | 48 | 39 | 23 | 52 | 39 |
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| Loss/(Gain) on debt extinguishment | - | -58 | -9 | 15 | -25 | -21 | -53 | -44 | -51 | -9 | -77 | - | 109 | -382 |
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| Amortization of in-the-money contracts and emissions allowances | - | - | - | - | - | - | - | - | - | - | - | 158 | 137 | 105 |
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| Amortization of unearned equity compensation | 30 | 28 | 41 | 38 | 42 | 10 | 35 | 25 | 20 | 22 | 21 | 28 | 101 | 102 |
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| Net gain on sale of assets and disposal of assets | - | - | - | - | - | - | - | - | 23 | 23 | 261 | 102 | 1,559 | 192 |
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| Impairment losses | - | - | - | - | - | - | - | - | - | 93 | 544 | 206 | 128 | 43 |
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| Changes in derivative instruments | - | - | - | - | - | - | - | - | -34 | - | - | 3,221 | -2,455 | 337 |
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| Increase (Decrease) in Income Taxes | 255 | -859 | -353 | -67 | -154 | -43 | 91 | 5 | -3,353 | 228 | 604 | 382 | -92 | 165 |
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| Changes in collateral deposits in support of risk management activities | 38 | - | - | - | - | 365 | -80 | -105 | 105 | 127 | 797 | 896 | -1,806 | 245 |
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| Changes in nuclear decommissioning trust liability | 34 | 20 | 37 | 15 | 19 | 41 | 11 | 60 | 37 | 51 | 40 | 9 | - | - |
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| Uplift securitization proceeds received from ERCOT | - | - | - | - | - | - | - | - | - | - | - | 689 | - | - |
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| Accounts receivable - trade | -138 | 119 | 131 | 224 | 2 | 12 | 99 | 83 | -5 | - | 1,232 | 1,560 | -840 | 366 |
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| Inventory | -91 | -145 | 172 | -11 | 245 | -134 | -143 | -31 | -22 | -27 | 61 | 252 | -189 | -111 |
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| Prepayments and other current assets | 51 | -59 | 26 | 22 | -182 | 39 | -12 | 41 | -29 | -4 | -31 | -17 | 233 | 539 |
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| Accounts payable | -261 | 9 | -132 | 275 | -12 | -27 | 77 | 113 | -177 | -56 | 476 | 1,295 | -1,455 | 170 |
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| Accrued expenses and other current liabilities | - | - | - | - | - | - | - | - | - | -42 | -55 | -29 | 360 | 136 |
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| Other assets and liabilities | -10 | -4 | -278 | 453 | 217 | 92 | 216 | 104 | 186 | 84 | 89 | 161 | 473 | 621 |
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| Cash provided/(used) by operating activities | 1,623 | 1,166 | 1,149 | 1,270 | 1,510 | 2,072 | 1,387 | 1,377 | 1,413 | 1,837 | 493 | 360 | -221 | 2,306 |
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| Payments for acquisitions of businesses and assets, net of cash acquired | - | - | - | - | - | - | - | - | - | 284 | 3,559 | 62 | 2,523 | 38 |
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| Capital expenditures | 706 | 2,310 | 3,396 | 1,987 | 909 | 1,244 | 1,111 | 388 | 228 | 230 | 269 | 367 | 598 | 472 |
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| Proceeds from Sale of Other Productive Assets | - | - | - | - | - | - | - | - | 1,294 | 81 | 830 | 109 | 2,007 | 501 |
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| Net purchases of emissions allowances | - | - | - | - | - | - | - | - | - | 10 | - | 6 | 24 | 18 |
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| Proceeds from insurance recoveries for property, plant and equipment, net | - | - | - | - | - | - | - | - | - | - | - | - | 240 | 3 |
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| Investments in nuclear decommissioning trust fund securities | - | - | - | - | - | - | - | - | 416 | 492 | 751 | 454 | 367 | - |
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| Proceeds from Sale of Debt Securities, Available-for-Sale | - | - | - | - | - | - | - | - | 381 | 439 | 710 | 448 | 355 | - |
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| Cash used by investing activities | -1,623 | -3,047 | -2,262 | -2,528 | -2,903 | -824 | -1,066 | -205 | 556 | -494 | -3,039 | -332 | -910 | -24 |
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| Proceeds from issuance of preferred stock, net of fees | - | - | - | - | - | - | - | - | - | - | - | - | 635 | - |
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| Payments for share repurchase activity and excise tax | 180 | 430 | - | 25 | 39 | - | - | 1,250 | 1,440 | 229 | 48 | 606 | 1,172 | 935 |
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| Equivalent shares purchased in lieu of tax withholdings | - | - | - | - | - | - | - | - | 36 | 27 | 9 | 6 | 22 | 50 |
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| Payments of dividends to preferred and common stockholders | - | - | - | - | - | 76 | 38 | 37 | 32 | 295 | 319 | 332 | 381 | 405 |
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| Proceeds from issuance of long-term debt | - | - | - | - | - | - | - | - | - | 3,234 | 1,100 | - | 731 | 3,200 |
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| Payments for current and long-term debt | - | - | - | - | - | - | - | - | 2,571 | 335 | 1,861 | 5 | 523 | 3,255 |
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| Payments for debt extinguishment costs | - | - | - | - | - | - | 42 | 32 | 26 | 5 | 65 | - | - | 262 |
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| Payments of debt issuance costs | 75 | 207 | 35 | 50 | 67 | 89 | 63 | 19 | 35 | 75 | 18 | 9 | 32 | 45 |
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| Net (payments)/receipts from settlement of acquired derivatives that include financing elements | - | - | - | - | - | - | - | - | - | - | -938 | -1,995 | -342 | 3 |
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| Proceeds from credit facilities | - | - | - | - | - | - | - | - | - | - | - | - | 3,020 | 1,050 |
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| Repayments to credit facilities | - | - | - | - | - | - | - | - | - | - | - | - | 3,020 | 1,050 |
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| Cash (used)/provided by financing activities | 651 | 33 | 2,099 | 1,427 | 1,265 | -794 | -485 | -1,526 | -2,148 | 2,204 | -272 | 1,043 | -400 | -1,755 |
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| Effect of exchange rate changes on cash and cash equivalents | - | - | - | - | - | - | - | - | - | - | - | -3 | 2 | -3 |
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| Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash | - | - | - | - | - | - | 150 | -473 | -228 | 3,545 | -2,820 | 1,068 | -1,529 | 524 |
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