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Balance Sheet Components Allowance for Uncollectible accounts activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance as of beginning of year | $ 16 | $ 5 | $ 15
Increase in provision | 35 | 15 | 2
Amounts written off, less recoveries | (25) | (4) | (12)
Balance as of end of year | 26 | 16 | $ 5
OPUC |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in provision | $ 29 | $ 8 |

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