| Dec 31, 2010 | Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | 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 | - | - | - | - | - | 302 | 332 | 129 | -51 | 383 | -14 | 589 | 792 | 674 | 845 |
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| Depreciation and amortization | 596 | 538 | 562 | 577 | 606 | 524 | 547 | 570 | 600 | 717 | 726 | 748 | 821 | 908 | 1,043 |
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| Deferred income taxes | 200 | 178 | 305 | 287 | 299 | 135 | 182 | 307 | -188 | 118 | -29 | 112 | 157 | 134 | 168 |
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| Share-Based Payment Arrangement, Noncash Expense | 31 | 39 | 45 | 51 | 72 | 51 | 47 | 40 | 29 | 26 | 17 | 24 | 25 | 34 | 44 |
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| Loss (gain) on sale of assets | - | - | - | - | - | - | - | - | - | - | -410 | -6 | 105 | -3 | -3 |
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| Payments for assets retirement obligations | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 73 |
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| Other adjustments | - | - | - | - | - | - | -4 | 7 | 2 | -1 | 0 | -1 | 6 | -18 | -53 |
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| Accounts receivable | 244 | -220 | 51 | 95 | 63 | -262 | 188 | 52 | 186 | -188 | 4 | 40 | 216 | -184 | 102 |
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| Gas storage and other inventories | -103 | 142 | -62 | 9 | 120 | -47 | -39 | -19 | -41 | 2 | 2 | 113 | 259 | -234 | -102 |
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| Accounts payable | 38 | -155 | 57 | 68 | 38 | -190 | 109 | 49 | 268 | -300 | -30 | 55 | 165 | -172 | 72 |
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| Exchange gas receivable/payable | 14 | 100 | 9 | -21 | 43 | 32 | -37 | 65 | - | -55 | 7 | 114 | -58 | -126 | 134 |
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| Other accruals | -56 | -33 | 26 | -2 | -5 | 55 | 6 | -32 | - | -105 | 219 | -43 | -73 | 103 | -9 |
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| Prepayments and other current assets | -11 | -10 | -4 | -17 | -10 | 1 | -0 | -13 | - | -34 | -6 | -37 | -10 | 37 | -76 |
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| Regulatory assets/liabilities | -164 | 323 | 52 | -479 | 247 | 18 | 188 | -57 | 53 | 86 | -71 | -77 | 129 | 26 | 9 |
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| Postretirement and postemployment benefits | -147 | -93 | 123 | -549 | 138 | 26 | -45 | -381 | 58 | -21 | -104 | -96 | 85 | -22 | -64 |
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| Deferred charges and other noncurrent assets | 8 | 7 | 72 | 20 | -0 | 5 | -1 | -2 | - | -76 | -15 | -5 | -4 | -10 | -21 |
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| Other noncurrent liabilities and deferred credits | -13 | 82 | -14 | -9 | -3 | -20 | 1 | -34 | -3 | 62 | 22 | -30 | -48 | -48 | 26 |
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| Net Cash Flows from Operating Activities | 725 | 870 | 1,276 | 1,437 | 1,320 | 1,457 | 803 | 742 | 540 | 1,583 | 1,104 | 1,218 | 1,409 | 1,935 | 1,782 |
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| Capital expenditures | 804 | 1,125 | 1,499 | 1,880 | 2,029 | 1,361 | 1,475 | 1,696 | 1,818 | 1,802 | 1,758 | 1,838 | 2,203 | 2,646 | 2,614 |
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| Proceeds from Insurance Settlement, Investing Activities | - | - | 7 | 6 | 11 | - | - | - | - | - | - | - | 105 | 3 | 1 |
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| Cost of removal | - | - | - | - | - | - | 110 | 109 | 104 | 113 | 138 | 121 | 152 | 161 | 167 |
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| Purchases of available-for-sale securities | - | - | - | - | - | - | - | 168 | 90 | 140 | 145 | 103 | 74 | 43 | 18 |
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| Sales of available-for-sale securities | - | - | - | - | - | - | - | 163 | 82 | 132 | 131 | 98 | 76 | 40 | 93 |
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| Milestone and final payments to renewable generation asset developer | - | - | - | - | - | - | - | - | - | - | 85 | 240 | 324 | 761 | 482 |
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| Advanced deposits for project costs | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 29 |
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| Other investing activities | 53 | 69 | 49 | 68 | 26 | 62 | 18 | -2 | -4 | -1 | 0 | 1 | -1 | 4 | -3 |
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| Net Cash Flows used for Investing Activities | -943 | -1,149 | -1,425 | -1,891 | -2,117 | 1,945 | -1,583 | -1,808 | -1,926 | -1,922 | -879 | -2,205 | -2,570 | -3,572 | -3,213 |
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| Proceeds from issuance of long-term debt | 245 | 890 | 991 | 1,308 | 748 | - | 500 | 3,250 | 350 | 750 | 2,974 | - | 346 | 1,489 | 2,230 |
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| Repayments of long-term debt and finance lease obligations | - | - | - | 511 | 521 | 2,092 | 435 | 1,855 | 1,046 | 52 | 1,622 | 26 | 60 | 33 | 26 |
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| Repayment of short term credit agreements | - | - | - | - | - | - | - | - | - | 700 | - | - | - | - | 1,650 |
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| Issuance of short term credit agreements | - | - | - | - | - | - | - | - | - | - | 1,350 | - | 1,000 | - | - |
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| Net change in commercial paper and other short-term borrowings | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -794 |
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| Proceeds from Issuance of Common Stock | 14 | 24 | 384 | 44 | 30 | 23 | 23 | 337 | 848 | 244 | 211 | 300 | 154 | 13 | 613 |
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| Redemption of preferred stock | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 486 |
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| Preferred stock redemption premium | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 14 |
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| Payment of obligation to renewable generation asset developer | - | - | - | - | - | - | - | - | - | - | - | - | - | 347 | - |
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| Equity costs, premiums and other debt related costs | - | - | - | - | - | - | - | - | - | - | - | 18 | 13 | 30 | 67 |
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| Contributions from NIPSCO minority interest holders | - | - | - | - | - | - | - | - | - | - | 82 | 245 | 21 | 2,403 | 100 |
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| Distributions to NIPSCO minority interest holders | - | - | - | - | - | - | - | - | - | - | - | 1 | 6 | 14 | 50 |
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| Distributions to tax equity partners | - | - | - | - | - | - | - | - | - | - | - | 1 | 6 | 14 | 50 |
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| Distributions to tax equity partners | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 16 |
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| Dividends paid - common stock | 256 | 258 | 273 | 306 | 321 | 263 | 206 | 229 | 273 | 299 | 322 | 345 | 382 | 414 | 481 |
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| Dividends paid - preferred stock | - | - | - | - | - | - | - | - | 12 | 56 | 55 | 55 | 55 | 44 | 8 |
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| Contract liability payment | - | -62 | -3 | -3 | -9 | -93 | -4 | -144 | -46 | -18 | -246 | -40 | -66 | -67 | - |
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| Net Cash Flows (used for) from Financing Activities | 211 | 281 | 175 | 445 | 796 | -3,412 | 791 | 1,069 | 1,469 | 366 | -248 | 956 | 1,141 | 3,842 | -651 |
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| Change in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | - | - | 27 | -23 | -31 | -19 | 2,206 | -2,082 |
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