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Derivative Instruments - Quantitative Disclosures of Derivative Instruments Including Estimated Fair Values (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivatives designated as cash flow hedges | Interest rate swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain or (Loss) Recognized in Other Comprehensive Income (Loss) $ (333) $ (102) $ (37)
Derivatives designated as cash flow hedges | Interest rate swaps | Interest expense, net      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain or (Loss) Reclassified from AOCI into Earnings (102) (26) (19)
Derivatives designated as cash flow hedges | Forward-currency contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain or (Loss) Recognized in Other Comprehensive Income (Loss) (2) (4) 11
Derivatives designated as cash flow hedges | Forward-currency contracts | Cost of sales      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain or (Loss) Reclassified from AOCI into Earnings 2 5 (1)
Derivatives designated as net investment hedges | Cross-currency rate swaps      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain or (Loss) Recognized in Other Comprehensive Income (Loss) (302) (118) 383
Derivatives designated as net investment hedges | Cross-currency rate swaps | Interest expense, net      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain or (Loss) Recognized in Earnings (Amount Excluded from Effectiveness Testing) $ 69 $ 70 $ 60