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Accumulated Other Comprehensive Income (Loss) - Summary of AOCI(L) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Changes in Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance $ 3,276 $ 2,284 $ 3,182 $ 3,030
Other comprehensive income (loss) 48 74 52 (204)
Ending balance 3,521 2,358 3,521 2,358
Accumulated Other Comprehensive Income Attributable to Parent        
Changes in Accumulated Other Comprehensive Income [Roll Forward]        
Beginning balance (1,638) (1,983) (1,642) (1,705)
Ending balance (1,590) (1,909) (1,590) (1,909)
Accumulated Foreign Currency Adjustment Attributable to Parent        
Changes in Accumulated Other Comprehensive Income [Roll Forward]        
Other comprehensive income (loss), adjustments during the period 24 47 57 (225)
Other comprehensive income (loss), adjustments reclassified to income 2 0 4 0
Income taxes 11 17 (31) 2
Other comprehensive income (loss) 37 64 30 (223)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent        
Changes in Accumulated Other Comprehensive Income [Roll Forward]        
Other comprehensive income (loss), adjustments reclassified to income 14 12 27 24
Income taxes (3) (2) (5) (5)
Other comprehensive income (loss) $ 11 $ 10 $ 22 $ 19