| 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 | 95 | 104 | 79 | 112 | 192 | 123 | 137 | 116 | 137 | 197 | 129 | 147 | 155 | 171 | 180 |
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| Depreciation and amortization | 108 | 114 | 126 | 133 | 138 | 148 | 165 | 176 | 187 | 206 | 224 | 232 | 253 | 265 | 274 |
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| Provision for deferred income taxes | 38 | 24 | 21 | 24 | 144 | 52 | - | - | 9 | 15 | 45 | 11 | -18 | -37 | -5 |
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| Power And Natural Gas Cost Amortization Deferrals Net | - | - | - | - | - | - | - | - | - | - | -10 | -52 | -78 | 7 | 104 |
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| Amortization of debt expense | 4 | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 3 | 2 |
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| Stock-based compensation expense | 5 | 6 | 6 | 6 | 8 | 7 | 8 | 7 | 5 | 11 | 6 | 5 | 9 | 8 | 9 |
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| Equity-related AFUDC | 3 | 2 | 4 | 6 | 9 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 9 |
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| Pension and other postretirement benefit expense | - | - | 40 | 42 | 23 | 37 | 39 | 37 | 32 | 36 | 34 | 29 | 32 | 14 | 12 |
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| Other regulatory assets and liabilities | - | - | - | - | - | - | - | - | - | - | - | - | - | 34 | 28 |
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| Other non-current assets and liabilities | - | - | - | - | - | - | - | - | - | - | - | - | - | -26 | -36 |
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| Change in decoupling regulatory deferral | - | - | - | - | - | - | - | - | - | - | -3 | -6 | -33 | 3 | 35 |
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| Realized and unrealized losses (gains) on assets and investments | - | - | - | - | - | - | - | - | - | - | - | - | 50 | -3 | -5 |
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| Other | - | - | 5 | 13 | 9 | -7 | 6 | 2 | 1 | -14 | 2 | -3 | 12 | -6 | -4 |
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| Contributions to defined benefit pension plan | 21 | 26 | - | - | 32 | 12 | 12 | 22 | 22 | 22 | 22 | 42 | 42 | 10 | 10 |
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| Cash paid on settlement of interest rate swap agreements | - | - | - | - | - | - | 54 | - | - | - | 34 | 18 | 17 | 0 | - |
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| Proceeds from Settlement Of Derivative Instruments | - | - | - | - | - | - | - | - | - | - | - | 0 | - | 8 | 4 |
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| Accounts and notes receivable | 19 | -31 | -8 | 33 | -16 | -11 | -17 | 9 | -15 | 4 | 11 | 46 | 56 | -37 | -3 |
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| Inventory | 11 | 3 | -5 | -3 | 19 | 12 | 1 | 5 | 6 | 6 | 1 | 17 | 23 | 52 | 40 |
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| Collateral posted for derivative instruments | - | - | - | - | - | -13 | 11 | 22 | 4 | -64 | -2 | 18 | 141 | -129 | -18 |
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| Income taxes receivable | - | - | - | - | 36 | 20 | -34 | -53 | -2 | 9 | 41 | -20 | 1 | -2 | 3 |
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| Other current assets | 9 | 24 | -27 | 18 | 7 | 2 | -4 | 2 | 3 | 4 | 2 | -1 | 7 | 26 | -16 |
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| Accounts payable | 14 | -18 | 30 | -8 | -13 | -8 | 5 | -8 | -0 | 7 | -10 | 33 | 66 | -66 | -8 |
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| Other current liabilities | 7 | -0 | -6 | 9 | 32 | -6 | 11 | 1 | -0 | -1 | 16 | 4 | 22 | 15 | 13 |
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| Net cash provided by operating activities | 228 | 269 | 317 | 243 | 267 | 376 | 358 | 410 | 362 | 398 | 331 | 267 | 124 | 447 | 534 |
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| Utility property capital expenditures (excluding equity-related AFUDC) | 202 | 240 | 271 | 294 | 326 | 393 | 407 | 412 | 424 | 443 | 404 | 440 | 452 | 499 | 533 |
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| Issuance of notes receivable | - | - | - | - | - | - | 10 | 4 | 4 | 7 | 4 | 2 | 3 | 3 | - |
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| Equity and property investments | - | - | - | - | - | - | - | - | - | - | 6 | 16 | 11 | 13 | 10 |
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| Proceeds from sale of investments | - | - | - | - | - | - | - | - | - | - | 7 | 8 | 1 | 3 | - |
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| Other | 4 | 6 | 7 | 1 | 3 | 10 | 7 | 6 | 2 | -1 | 3 | 5 | -4 | -2 | -4 |
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| Net cash used in investing activities | -253 | -282 | -295 | -312 | -104 | -388 | -432 | -434 | -440 | -446 | -411 | -445 | -460 | -510 | -539 |
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| Proceeds from (Repayments of) Short-Term Debt | 23 | -49 | -9 | 119 | -66 | - | 15 | -15 | 85 | -4 | 17 | 81 | 179 | -114 | 5 |
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| Proceeds from issuance of long-term debt | 136 | 85 | 80 | 90 | 150 | 100 | 245 | 90 | 375 | 180 | 165 | 140 | 400 | 250 | 84 |
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| Maturity of long-term debt and finance leases | - | - | - | - | - | - | - | - | - | 93 | 55 | - | 253 | 17 | 3 |
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| Proceeds from Issuance of Common Stock | 46 | 26 | 29 | 5 | 4 | 2 | 67 | 56 | 1 | 65 | 72 | 90 | 138 | 112 | 68 |
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| Cash dividends paid | 56 | 64 | 69 | 73 | 78 | 82 | 87 | 92 | 98 | 103 | 110 | 118 | 129 | 141 | 150 |
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| Other | -0 | 1 | 1 | 0 | 2 | -2 | -4 | -4 | -8 | -2 | -5 | -4 | -7 | -6 | -4 |
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| Net cash provided by financing activities | 57 | 18 | -21 | 77 | -224 | 1 | 72 | 31 | 77 | 43 | 84 | 186 | 327 | 85 | - |
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| Net increase (decrease) in cash and cash equivalents | - | - | - | - | - | - | - | - | - | - | 4 | 8 | -9 | 22 | -5 |
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| Interest | - | - | - | - | - | - | - | - | - | - | - | - | 107 | 132 | 141 |
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| Income taxes paid | 14 | 26 | 8 | 45 | 45 | - | - | 6 | 18 | 27 | 2 | 4 | 2 | 3 | 12 |
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| Income tax refunds | - | - | - | - | 36 | 37 | 19 | 47 | 3 | 1 | 1 | 22 | 0 | 1 | 1 |
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| Accounts payable for capital expenditures | 8 | 21 | 21 | 13 | 27 | 35 | 30 | 31 | 32 | 26 | 32 | 24 | 28 | 34 | 24 |
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