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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Changes in Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period $ 5,070 $ 4,850
Balance at end of period 5,035 5,000
Foreign Currency Translation Adjustment    
Changes in Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period (1,160) (915)
Other comprehensive income (loss) before reclassifications, net of tax (82) (210)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0
Balance at end of period (1,242) (1,125)
Unrecognized Net Actuarial Losses and Prior Service Costs    
Changes in Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period (2,923) (3,052)
Other comprehensive income (loss) before reclassifications, net of tax 1 (1)
Amounts reclassified from accumulated other comprehensive loss, net of tax 78 92
Balance at end of period (2,844) (2,961)
Deferred Derivative Gains (Losses)    
Changes in Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period 7 (9)
Other comprehensive income (loss) before reclassifications, net of tax 14 6
Amounts reclassified from accumulated other comprehensive loss, net of tax (8) 6
Balance at end of period 13 3
Total    
Changes in Accumulated Other Comprehensive Loss [Roll Forward]    
Balance at beginning of period (4,076) (3,976)
Other comprehensive income (loss) before reclassifications, net of tax (67) (205)
Amounts reclassified from accumulated other comprehensive loss, net of tax 70 98
Balance at end of period $ (4,073) $ (4,083)