Hedges and Derivative Financial Instruments - Schedule of Outstanding Derivative Contracts (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Fair value of hedged assets	$ 346	$ 144
Fair value of hedged liabilities	166	139
Derivative asset at fair value, current	167	55
Derivative asset at fair value, noncurrent	179	89
Total derivatives, hedge assets at fair value	346	144
Derivative liability at fair value, current	77	61
Derivative liability at fair value, noncurrent	89	78
Total derivatives, hedge liabilities at fair value	166	139
Derivatives accounted for as hedges(1)
Derivatives, Fair Value [Line Items]
Fair value of hedged assets	298	129
Fair value of hedged liabilities	136	117
Derivatives accounted for as hedges(1) \| Commodity swaps/options
Derivatives, Fair Value [Line Items]
Notional amount	237	174
Fair value of hedged assets	0	4
Fair value of hedged liabilities	$ 55	$ 10
Maximum term of commodity swaps/options (in months)	36 months	21 months
Derivatives accounted for as hedges(1) \| Foreign exchange forwards/options
Derivatives, Fair Value [Line Items]
Notional amount	$ 2,923	$ 3,177
Fair value of hedged assets	183	94
Fair value of hedged liabilities	$ 17	$ 84
Maximum term of foreign exchange forwards/options (in months)	143 months	32 months
Derivatives accounted for as hedges(1) \| Cross-currency swaps
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,275	$ 1,275
Fair value of hedged assets	115	25
Fair value of hedged liabilities	$ 0	$ 23
Maximum term of cross-currency swaps (in months)	107 months	110 months
Derivatives accounted for as hedges(1) \| Interest rate derivatives
Derivatives, Fair Value [Line Items]
Notional amount	$ 300	$ 300
Fair value of hedged assets	0	6
Fair value of hedged liabilities	$ 64	$ 0
Maximum term of interest rate derivatives (in months)	62 months	65 months
Derivatives not accounted for as hedges
Derivatives, Fair Value [Line Items]
Fair value of hedged assets	$ 48	$ 15
Fair value of hedged liabilities	30	22
Derivatives not accounted for as hedges \| Commodity swaps/options
Derivatives, Fair Value [Line Items]
Notional amount	1	1
Fair value of hedged assets	0	0
Fair value of hedged liabilities	$ 0	$ 0
Maximum term of commodity swaps/options (in months)	4 months	7 months
Derivatives not accounted for as hedges \| Foreign exchange forwards/options
Derivatives, Fair Value [Line Items]
Notional amount	$ 2,511	$ 3,182
Fair value of hedged assets	48	15
Fair value of hedged liabilities	$ 30	$ 22
Maximum term of foreign exchange forwards/options (in months)	9 months	12 months

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