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v3.21.1

Balance Sheet Components (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | 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 | $ 20 |  | $ 16 |
Unbilled Receivables, Current | 86 |  | 97 |
Finite-Lived Intangible Assets, Accumulated Amortization | 403 |  | 388 |
Amortization of Intangible Assets | 15 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 600 |  |  |
Debt Instrument, Covenant Description | 65.00% |  |  |
Ratio of Indebtedness to Net Capital | 0.552 |  |  |
Short-term debt | $ 200 |  | 150 | $ 150
Line of Credit Facility, Remaining Borrowing Capacity | 500 |  |  |
Line of Credit Facility, Current Borrowing Capacity | 220 | $ 500 |  |
Letters of credit issued | 75 |  |  |
Authorized Short-Term Debt | 900 |  |  |
Long-term Debt, Current Maturities | 20 |  | $ 160 |
Proceeds from Issuance of Long-term Debt | 0 | 119 |  |
Purchased power and fuel | 169 | 153 |  |
Repayments of Long-term Debt | 140 | $ 98 |  |
Letter of Credit [Member] |  |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Short-term debt | $ 0 |  |  |

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