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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in AOCL (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 4,545 $ 5,070
Ending balance 3,039 5,035
Foreign Currency Translation Adjustment    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (1,156) (1,160)
Other comprehensive income (loss) before reclassifications, net of tax (237) (82)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0
Ending balance (1,393) (1,242)
Unrecognized Net Actuarial Losses and Prior Service Costs    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (2,983) (2,923)
Other comprehensive income (loss) before reclassifications, net of tax (12) 1
Amounts reclassified from accumulated other comprehensive loss, net of tax 96 78
Ending balance (2,899) (2,844)
Deferred Derivative Gains (Losses)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 3 7
Other comprehensive income (loss) before reclassifications, net of tax 18 14
Amounts reclassified from accumulated other comprehensive loss, net of tax (11) (8)
Ending balance 10 13
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (4,136) (4,076)
Other comprehensive income (loss) before reclassifications, net of tax (231) (67)
Amounts reclassified from accumulated other comprehensive loss, net of tax 85 70
Ending balance $ (4,282) $ (4,073)