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Balance Sheet Components (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 23 | $ 28 |  | $ 23 |  | $ 26
Unbilled Receivables, Current | 94 |  |  | 94 |  | 117
Finite-Lived Intangible Assets, Accumulated Amortization | 470 |  |  | 470 |  | 446
Amortization of Intangible Assets | 14 |  | $ 15 | 29 | $ 30 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 750 |  |  | $ 750 |  |
Debt Instrument, Covenant Description |  |  |  | 65.00% |  |
Ratio of Indebtedness to Net Capital | 0.556 |  |  | 0.556 |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 650 |  |  | $ 650 |  |
Line of Credit Facility, Current Borrowing Capacity | 220 |  | 650 | 220 | 650 |
Authorized Short-Term Debt | 900 |  |  | 900 |  |
Purchased power and fuel | 168 |  | $ 185 | 370 | 354 |
Repayments of Long-term Debt |  |  |  | 0 | 140 |
Operating Lease, Right-of-Use Asset | 29 |  |  | 29 |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 30 |  |  | 30 |  |
Amount above baseline net variable power costs |  |  |  | (32) |  | 62
Lower deadband limit below baseline net variable power costs |  |  |  | 15 |  |
Upper deadband limit above baseline net variable power costs |  |  |  | 30 |  |
Proceeds from failed sale-leaseback transactions |  |  |  | 25 | $ 0 |
Letters of Credit Outstanding, Amount | 91 |  |  | 91 |  |
Sale Leaseback Transaction, Net Book Value |  |  |  |  |  | 37
Gain (Loss) on Disposition of Intangible Assets |  |  |  | 11 |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 1 |  |
Asset Impairment Charges |  |  |  | 17 |  |
Increase (Decrease) in Deferred Charges |  | $ 15 |  |  |  |
Tangible Asset Impairment Charges |  |  |  | 2 |  |
Finance Lease, Liability | 25 |  |  | 25 |  |
221119 Other Electric Power Generation |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 30 |  |  | 30 |  | 29
Fire |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 30 |  |  | 30 |  | 45
pandemic |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 34 |  |  | 34 |  | $ 36
Letter of Credit [Member] |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Commercial paper | $ 0 |  |  | $ 0 |  |

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