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Fair Value Measurements - Recurring Assets and Liabilities (Details) - Recurring - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Fair value, assets | $ 1,902 | $ 1,438
Liabilities |  |
Fair value, liabilities | (27) | (45)
Net assets (liabilities) | 1,875 | 1,393
FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (3) | (1)
NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (24) | (44)
Corporate debt securities |  |
Assets |  |
Fair value, assets | 446 | 405
FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 6 | 10
Equity securities |  |
Assets |  |
Fair value, assets | 362 | 339
Foreign government debt securities |  |
Assets |  |
Fair value, assets | 17 | 13
U.S. government debt securities |  |
Assets |  |
Fair value, assets | 18 | 20
U.S. state debt securities |  |
Assets |  |
Fair value, assets | 266 | 250
Other |  |
Assets |  |
Fair value, assets | 787 | 401
Level 1 |  |
Assets |  |
Fair value, assets | 1,078 | 706
Liabilities |  |
Fair value, liabilities | 0 | 0
Net assets (liabilities) | 1,078 | 706
Level 1 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Equity securities |  |
Assets |  |
Fair value, assets | 362 | 339
Level 1 | Foreign government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Other |  |
Assets |  |
Fair value, assets | 716 | 367
Level 2 |  |
Assets |  |
Fair value, assets | 818 | 722
Liabilities |  |
Fair value, liabilities | 0 | 0
Net assets (liabilities) | 818 | 722
Level 2 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 446 | 405
Level 2 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Equity securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Foreign government debt securities |  |
Assets |  |
Fair value, assets | 17 | 13
Level 2 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 18 | 20
Level 2 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 266 | 250
Level 2 | Other |  |
Assets |  |
Fair value, assets | 71 | 34
Level 3 |  |
Assets |  |
Fair value, assets | 6 | 10
Liabilities |  |
Fair value, liabilities | (27) | (45)
Net assets (liabilities) | (21) | (35)
Level 3 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (3) | (1)
Level 3 | NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (24) | (44)
Level 3 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 6 | 10
Level 3 | Equity securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Foreign government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Other |  |
Assets |  |
Fair value, assets | $ 0 | $ 0

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