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Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance $ 6,814 $ 6,975 $ 6,932 $ 6,814 $ 6,975 $ 6,814
Amounts reclassified from AOCI (3)   (7)   (26) (13)
Other comprehensive loss (3)   (7)   (26) (13)
Income taxes (benefits) on other comprehensive income (loss) (1)   (2)   (6) (3)
Other comprehensive loss, net of tax (2) (18) (5) (5) (20) (10)
Ending balance 7,143 6,814 7,269 6,932 7,143 7,269
Gains & Losses on Cash Flow Hedges            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (9) (9) (10) (11) (9) (11)
Amounts reclassified from AOCI 1   0   1 1
Other comprehensive loss 1   0   1 1
Income taxes (benefits) on other comprehensive income (loss) 0   0   0 0
Other comprehensive loss, net of tax 1   0   1 1
Ending balance (8) (9) (10) (10) (8) (10)
Defined Benefit Pension & OPEB Plans            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance 11 29 46 52 29 52
Amounts reclassified from AOCI (4)   (7)   (27) (14)
Other comprehensive loss (4)   (7)   (27) (14)
Income taxes (benefits) on other comprehensive income (loss) (1)   (2)   (6) (3)
Other comprehensive loss, net of tax (3)   (5)   (21) (11)
Ending balance 8 11 41 46 8 41
AOCI            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance 2 20 36 41 20 41
Other comprehensive loss, net of tax (2) (18) (5) (5)    
Ending balance $ 0 $ 2 $ 31 $ 36 $ 0 $ 31