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Fair Value Measurements (Details) - Recurring - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets    
Fair value, assets $ 1,309 $ 1,438
Liabilities    
Fair value, liabilities (42) (45)
Net assets (liabilities) 1,267 1,393
FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities (1) (1)
NUG contracts | Derivative Liabilities    
Liabilities    
Fair value, liabilities (41) (44)
Corporate debt securities    
Assets    
Fair value, assets 416 405
FTRs | Derivative Assets    
Assets    
Fair value, assets 0 10
Equity securities    
Assets    
Fair value, assets 384 339
Foreign government debt securities    
Assets    
Fair value, assets 16 13
U.S. government debt securities    
Assets    
Fair value, assets 29 20
U.S. state debt securities    
Assets    
Fair value, assets 256 250
Other    
Assets    
Fair value, assets 208 401
Level 1    
Assets    
Fair value, assets 558 706
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 558 706
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 384 339
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 174 367
Level 2    
Assets    
Fair value, assets 751 722
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 751 722
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 416 405
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 16 13
Level 2 | U.S. government debt securities    
Assets    
Fair value, assets 29 20
Level 2 | U.S. state debt securities    
Assets    
Fair value, assets 256 250
Level 2 | Other    
Assets    
Fair value, assets 34 34
Level 3    
Assets    
Fair value, assets 0 10
Liabilities    
Fair value, liabilities (42) (45)
Net assets (liabilities) (42) (35)
Level 3 | FTRs | Derivative Liabilities    
Liabilities    
Fair value, liabilities (1) (1)
Level 3 | NUG contracts | Derivative Liabilities    
Liabilities    
Fair value, liabilities (41) (44)
Level 3 | Corporate debt securities    
Assets    
Fair value, assets 0 0
Level 3 | FTRs | Derivative Assets    
Assets    
Fair value, assets 0 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