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Balance Sheet Components (Details) $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Aug. 11, 2021 USD ($) | Jan. 06, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Apr. 09, 2020 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 27 |  |  | $ 27 |  | $ 27 |  | $ 22 |  | $ 16 |
Unbilled Receivables, Current | 80 |  |  | 80 |  | 80 |  |  |  | 97 |
Finite-Lived Intangible Assets, Accumulated Amortization | 432 |  |  | 432 |  | 432 |  |  |  | 388 |
Amortization of Intangible Assets |  |  |  | 14 | $ 16 | 44 | $ 47 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 750 |  |  | $ 750 |  | $ 750 |  |  |  |  |
Debt Instrument, Covenant Description |  |  |  |  |  | 65.00% |  |  |  |  |
Ratio of Indebtedness to Net Capital | 0.564 |  |  | 0.564 |  | 0.564 |  |  |  |  |
Short-term debt | $ 0 |  |  | $ 0 |  | $ 0 |  |  | $ 200 | 150 | $ 150
Line of Credit Facility, Remaining Borrowing Capacity | 650 |  |  | 650 |  | 650 |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | 220 |  |  | 220 | 650 | 220 | 650 |  |  |  |
Letters of credit issued | 78 |  |  | 78 |  | 78 |  |  |  |  |
Authorized Short-Term Debt | 900 |  |  | 900 |  | 900 |  |  |  |  |
Long-term Debt, Current Maturities | 0 |  |  | 0 |  | 0 |  |  |  | 160 |
Proceeds from Issuance of Long-term Debt | 400 |  |  |  |  | 400 | 319 |  |  |  |
Purchased power and fuel |  |  |  | 259 | $ 292 | 613 | 554 |  |  |  |
Repayments of Long-term Debt |  | $ 20 | $ 140 |  |  | 160 | $ 98 |  |  |  |
Operating Lease, Right-of-Use Asset | 140 |  |  | 140 |  | 140 |  |  |  |  |
Amount above baseline net variable power costs |  |  |  |  |  | 60 |  |  |  |  |
Lower deadband limit below baseline net variable power costs |  |  |  |  |  | 15 |  |  |  |  |
Upper deadband limit above baseline net variable power costs |  |  |  |  |  | 30 |  |  |  |  |
Issuance of 2028 Bonds | 100 |  |  |  |  |  |  |  |  |  |
Issuance of 2031 Bonds | 50 |  |  |  |  |  |  |  |  |  |
Issuance of 2034 Bonds | 100 |  |  |  |  |  |  |  |  |  |
Issuance of 2051 Bonds | 150 |  |  |  |  |  |  |  |  |  |
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 | 27 |  |  | 27 |  | 27 |  |  |  | 0 |
Fire |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 36 |  |  | 36 |  | 36 |  |  |  | 15 |
pandemic |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Accounts Payable and Other Operating Liabilities | 27 |  |  | 27 |  | 27 |  |  |  | $ 10 |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term debt | $ 0 |  |  | $ 0 |  | $ 0 |  |  |  |  |

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