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Fair Value Measurements and Financial Instruments - Schedule of Gain (Loss) Included in OCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI $ (49) $ (22) $ 4 $ 3
Foreign Currency Contracts        
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI (2) (12) 4 13
Net investment hedges [Abstract]        
Gain (loss) on instruments (19) (12) 4 13
Gain (loss) on hedged items 19 12 (4) (13)
Forward-starting interest rate swaps        
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI (48) (8) (2) (8)
Commodity Contracts        
Cash flow hedges [Abstract]        
Gain (loss) recognized in OCI 1 (2) 2 (2)
Foreign Currency Debt        
Net investment hedges [Abstract]        
Gain (loss) on instruments (62) (68) 149 (3)
Gain (loss) on hedged items $ 62 $ 68 $ (149) $ 3