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Accumulated Other Comprehensive Income (Loss) - Components of the Company's AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, deferred taxes $ (160) $ (136) $ (39)
Balance 11,531 10,042 8,788
Change in value, deferred tax 221 (24) (83)
Change in value (772) 88 289
Amounts reclassified to earnings, deferred taxes (100) 0 (13)
Amounts reclassified to earnings 351 (3) 49
Amounts reclassified to retained earnings, deferred taxes     (1)
Amounts reclassified to retained earnings     6
Balance, deferred taxes (39) (160) (136)
Balance 5,960 11,531 10,042
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (718) (803) (1,147)
Balance (1,139) (718) (803)
Pension and Other Postretirement Liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, before tax (560) (663) (1,102)
Change in value, before tax (993) 105 377
Amounts reclassified to earnings, before tax 451 (2) 62
Amounts reclassified to retained earnings, before tax     0
Balance, before tax (1,102) (560) (663)
Investments and Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, before tax 2 (4) (6)
Change in value, before tax 0 7 (5)
Amounts reclassified to earnings, before tax 0 (1) 0
Amounts reclassified to retained earnings, before tax     7
Balance, before tax $ 2 $ 2 $ (4)