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Fair Value Measurements - Recurring Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Liabilities |  |
Restricted cash | $ 27 | $ 49
Recurring |  |
Assets |  |
Fair value, assets | 616 | 1,837
Liabilities |  |
Fair value, liabilities | 0 | (1)
Net assets (liabilities) | 616 | 1,836
Recurring | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | (1)
Recurring | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 1 | 9
Recurring | Equity securities |  |
Assets |  |
Fair value, assets | 2 | 2
Recurring | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 258 | 273
Recurring | Cash, cash equivalents and restricted cash |  |
Assets |  |
Fair value, assets | 310 | 1,511
Recurring | Other |  |
Assets |  |
Fair value, assets | 45 | 42
Recurring | Level 1 |  |
Assets |  |
Fair value, assets | 312 | 1,513
Liabilities |  |
Fair value, liabilities | 0 | 0
Net assets (liabilities) | 312 | 1,513
Recurring | Level 1 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Recurring | Level 1 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 1 | Equity securities |  |
Assets |  |
Fair value, assets | 2 | 2
Recurring | Level 1 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 1 | Cash, cash equivalents and restricted cash |  |
Assets |  |
Fair value, assets | 310 | 1,511
Recurring | Level 1 | Other |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 2 |  |
Assets |  |
Fair value, assets | 303 | 315
Liabilities |  |
Fair value, liabilities | 0 | 0
Net assets (liabilities) | 303 | 315
Recurring | Level 2 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Recurring | Level 2 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 2 | Equity securities |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 2 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 258 | 273
Recurring | Level 2 | Cash, cash equivalents and restricted cash |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 2 | Other |  |
Assets |  |
Fair value, assets | 45 | 42
Recurring | Level 3 |  |
Assets |  |
Fair value, assets | 1 | 9
Liabilities |  |
Fair value, liabilities | 0 | (1)
Net assets (liabilities) | 1 | 8
Recurring | Level 3 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | (1)
Recurring | Level 3 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 1 | 9
Recurring | Level 3 | Equity securities |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 3 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 3 | Cash, cash equivalents and restricted cash |  |
Assets |  |
Fair value, assets | 0 | 0
Recurring | Level 3 | Other |  |
Assets |  |
Fair value, assets | $ 0 | $ 0

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