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Fair Value Measurements (Details) - Recurring - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets    
Fair value, assets $ 1,438 $ 1,693
Liabilities    
Fair value, liabilities (45) (79)
Net assets (liabilities) 1,393 1,614
FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities (1) 0
NUG contracts | Derivative Liabilities    
Liabilities    
Fair value, liabilities (44) (79)
Corporate debt securities    
Assets    
Fair value, assets 405 476
FTRs | Derivative Assets    
Assets    
Fair value, assets 10 3
Equity securities    
Assets    
Fair value, assets 339 297
Foreign government debt securities    
Assets    
Fair value, assets 13 23
U.S. government debt securities    
Assets    
Fair value, assets 20 21
U.S. state debt securities    
Assets    
Fair value, assets 250 247
Other    
Assets    
Fair value, assets 401 626
Level 1    
Assets    
Fair value, assets 706 885
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 706 885
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 339 297
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 367 588
Level 2    
Assets    
Fair value, assets 722 805
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 722 805
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 405 476
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 13 23
Level 2 | U.S. government debt securities    
Assets    
Fair value, assets 20 21
Level 2 | U.S. state debt securities    
Assets    
Fair value, assets 250 247
Level 2 | Other    
Assets    
Fair value, assets 34 38
Level 3    
Assets    
Fair value, assets 10 3
Liabilities    
Fair value, liabilities (45) (79)
Net assets (liabilities) (35) (76)
Level 3 | FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities (1) 0
Level 3 | NUG contracts | Derivative Liabilities    
Liabilities    
Fair value, liabilities (44) (79)
Level 3 | Corporate debt securities    
Assets    
Fair value, assets 0 0
Level 3 | FTRs | Derivative Assets    
Assets    
Fair value, assets 10 3
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