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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Regulatory Liabilities | $ 1,493 | $ 1,446 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 506 |  |
Other Investments | $ 12 | 0 |
Document Period End Date | Dec. 31, 2024 |  |
Letters of Credit Outstanding, Amount | $ 85 | $ 40 |
Public Utilities, Allowance for Funds Used During Construction, Rate | 6.70% | 6.50% | 6.50%
Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest | $ 15 | $ 13 | $ 7
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | $ 23 | $ 19 | $ 14
Depreciation expense rate | 3.50% | 340.00% | 340.00%
Amortization of Intangible Assets | $ 72 | $ 61 | $ 58
Public Utilities, Approved Return on Equity, Percentage | 9.50% | 9.50% |
Regulatory Assets | $ 837 | $ 713 |
Finite-Lived Intangible Assets, Accumulated Amortization | 611 | 558 |
Future Amortization Expense, Year One | 70 |  |
Future Amortization Expense, Year Two | 62 |  |
Future Amortization Expense, Year Three | 56 |  |
Future Amortization Expense, Year Four | 33 |  |
Future Amortization Expense, Year Five | 13 |  |
Power Cost Deadband - Lower Threshold | 15 |  |
Power Cost Deadband - Upper Threshold | 30 |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 5,714 | 5,249 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 5,085 | 4,757 |
Other Operating Activities, Cash Flow Statement | 112 | 24 | 0
Asset Retirement Obligation, Cash Paid to Settle | 16 | 25 | 27
Deferred Purchased Power Costs | 78 | 5 |
Unbilled Receivables, Current | 177 | 138 |
Excise Taxes Collected | 63 | 56 | 53
Other Operating Activities, Cash Flow Statement | 112 | 24 | $ 0
LettersOfCreditOutstandingAmountForPriceRiskManagement | 18 |  |
Trojan decommissioning [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 161 | 139 |
Asset Retirement Obligation Costs [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Regulatory Liabilities | 7 | 4 |
Deferred Income Tax Charge [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Regulatory Liabilities | 179 | $ 177 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 0 |  |

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