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Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance $ 7,143 $ 6,814 $ 6,975 $ 7,269 $ 6,932 $ 6,814 $ 6,975 $ 6,814
Amounts reclassified from AOCI (3)     (7)     (29) (20)
Other comprehensive loss (3)     (7)     (29) (20)
Income taxes (benefits) on other comprehensive income (loss) (1)     (3)     (7) (6)
Other comprehensive loss, net of tax (2) (2) (18) (4) (5) (5) (22) (14)
Ending balance 7,188 7,143 6,814 7,272 7,269 6,932 7,188 7,272
Gains & Losses on Cash Flow Hedges                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance (8)   (9) (10)   (11) (9) (11)
Amounts reclassified from AOCI 0     0     1 1
Other comprehensive loss 0     0     1 1
Income taxes (benefits) on other comprehensive income (loss) 0     0     0 0
Other comprehensive loss, net of tax 0     0     1 1
Ending balance (8) (8)   (10) (10)   (8) (10)
Defined Benefit Pension & OPEB Plans                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance 8   29 41   52 29 52
Amounts reclassified from AOCI (3)     (7)     (30) (21)
Other comprehensive loss (3)     (7)     (30) (21)
Income taxes (benefits) on other comprehensive income (loss) (1)     (3)     (7) (6)
Other comprehensive loss, net of tax (2)     (4)     (23) (15)
Ending balance 6 8   37 41   6 37
AOCI                
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]                
Beginning balance 0 2 20 31 36 41 20 41
Other comprehensive loss, net of tax (2) (2) (18) (4) (5) (5)    
Ending balance $ (2) $ 0 $ 2 $ 27 $ 31 $ 36 $ (2) $ 27