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Accumulated Other Comprehensive Income (Loss) - Summary of AOCI(L) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Changes in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance $ 3,182 $ 3,030
Other comprehensive income (loss) 4 (278)
Ending balance 3,276 2,284
Accumulated Other Comprehensive Income Attributable to Parent    
Changes in Accumulated Other Comprehensive Income [Roll Forward]    
Beginning balance (1,642) (1,705)
Ending balance (1,638) (1,983)
Accumulated Foreign Currency Adjustment Attributable to Parent    
Changes in Accumulated Other Comprehensive Income [Roll Forward]    
Other comprehensive income (loss), adjustments during the period 33 (272)
Other comprehensive income (loss), adjustments reclassified to income 2 0
Income taxes (42) (15)
Other comprehensive income (loss) (7) (287)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
Changes in Accumulated Other Comprehensive Income [Roll Forward]    
Other comprehensive income (loss), adjustments reclassified to income 13 12
Income taxes (2) (3)
Other comprehensive income (loss) $ 11 $ 9