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Accumulated Other Comprehensive Income (Loss) - Components of the Company's AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, deferred taxes $ (136) $ (39) $ 26
Balance 10,042 [1] 8,788 8,574
Change in value, deferred tax (24) (83) 74
Change in value 88 289 (239)
Amounts reclassified to earnings, deferred taxes 0 13 21
Amounts reclassified to earnings (3) 49 39
Reclassification of stranded tax effects     0
Amounts reclassified to retained earnings, deferred taxes   (1)  
Amounts reclassified to retained earnings   6  
Balance, deferred taxes (160) (136) (39)
Balance 11,531 10,042 [1] 8,788
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (803) (1,147) (829)
Reclassification of stranded tax effects     (118)
Balance (718) (803) (1,147)
Pension and Other Postretirement Liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, before tax (663) (1,102) (854)
Change in value, before tax 105 377 (306)
Amounts reclassified to earnings, before tax (2) 62 58
Amounts reclassified to retained earnings, before tax   0  
Balance, before tax (560) (663) (1,102)
Investments and Other      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, before tax (4) (6) (1)
Change in value, before tax 7 (5) (7)
Amounts reclassified to earnings, before tax (1) 0 2
Amounts reclassified to retained earnings, before tax   7  
Balance, before tax $ 2 $ (4) $ (6)
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.