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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |
Regulatory Liabilities | $ 1,623 | $ 1,466 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 274 |  |
Other Investments | $ 150 | 44 |
Document Period End Date | Dec. 31, 2022 |  |
Letters of Credit Outstanding, Amount | $ 97 | $ 18 |
Public Utilities, Allowance for Funds Used During Construction, Rate | 6.50% | 6.70% | 6.90%
Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest | $ 7 | $ 8 | $ 8
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity | $ 14 | $ 17 | $ 16
Depreciation expense rate | 3.40% | 3.40% | 3.50%
Amortization of Intangible Assets | $ 58 | $ 58 | $ 64
Public Utilities, Approved Return on Equity, Percentage | 9.50% | 9.50% |
Regulatory Assets | $ 527 | $ 557 |
Finite-Lived Intangible Assets, Accumulated Amortization | 499 | 446 |
Future Amortization Expense, Year One | 54 |  |
Future Amortization Expense, Year Two | 49 |  |
Future Amortization Expense, Year Three | 37 |  |
Future Amortization Expense, Year Four | 28 |  |
Future Amortization Expense, Year Five | 23 |  |
Power Cost Deadband - Lower Threshold | 15 |  |
Power Cost Deadband - Upper Threshold | 30 |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 4,813 | 4,469 |
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation | 4,423 | 4,146 |
Asset Retirement Obligation, Cash Paid to Settle | 27 | 18 | 18
Deferred Purchased Power Costs | 23 | 62 |
Unbilled Receivables, Current | 131 | 117 |
Excise Taxes Collected | 53 | 48 | $ 46
Letter of Credit [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Letters of Credit Outstanding, Amount | 33 |  |
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 | 131 | 90 |
Asset Retirement Obligation Costs [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Regulatory Liabilities | 7 | 43 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | 0 |  |
Deferred Income Tax Charge [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Regulatory Liabilities | 194 | $ 208 |
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided | $ 0 |  |

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