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Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2023 USD ($) internal_grade | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Number of internal grades of credit quality | internal_grade |  |  | 3 |  |
Asset (gains) losses and impairments, net |  |  | $ 4,000,000 | $ 23,000,000 | $ (17,000,000)
Proceeds from sale of notes receivable |  |  | $ 0 | 22,000,000 | 0
Specific review of probable future collections based on receivable balances, threshold duration |  |  | 30 days |  |
Uncollectible expense (recovery) |  |  | $ 0 | 0 | 0
Allowance for expected credit loss related to accounts receivable |  |  | 0 | 0 |
Operation and maintenance |  |  | 245,000,000 | $ 267,000,000 | 231,000,000
Separation related transaction costs |  |  |  |  | 20,000,000
Related Party |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Operation and maintenance |  |  |  |  | $ 32,000,000
Past due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing receivables |  |  | 0 |  |
Notes receivable |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing receivables on nonaccrual status |  |  | $ 0 |  |
Asset (gains) losses and impairments, net | $ 17,000,000 | $ 19,000,000 |  |  |
Proceeds from sale of notes receivable | $ 22,000,000 |  |  |  |
Notes receivable | Minimum |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Period past due |  |  | 60 days |  |
Notes receivable | Maximum |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Period past due |  |  | 120 days |  |
Notes receivable | Internal grade 1 | Related Party |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing receivable originated prior to 2021 |  |  | $ 4,000,000 |  |

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