Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Fair value of hedge assets	$ 77	$ 142
Fair value of hedge liabilities	144	208
Derivative asset, current	60	89
Derivative asset, noncurrent	17	53
Derivative liability, current	95	81
Derivative liability, noncurrent	49	127
Derivative asset	77	142
Derivative liability	144	208
Derivatives accounted for as hedges
Derivatives, Fair Value [Line Items]
Fair value of hedge assets	50	84
Fair value of hedge liabilities	75	158
Derivatives accounted for as hedges \| Foreign exchange forwards/options
Derivatives, Fair Value [Line Items]
Notional Amount	3,126	3,113
Fair value of hedge assets	49	55
Fair value of hedge liabilities	$ 48	$ 157
Maximum term of foreign exchange forwards/options, in months	44 months	56 months
Derivatives accounted for as hedges \| Commodity swaps/options
Derivatives, Fair Value [Line Items]
Notional Amount	$ 216	$ 269
Fair value of hedge assets	1	29
Fair value of hedge liabilities	$ 27	$ 1
Maximum term of commodity swaps/options, in months	30 months	36 months
Derivatives not accounted for as hedges
Derivatives, Fair Value [Line Items]
Fair value of hedge assets	$ 27	$ 58
Fair value of hedge liabilities	69	50
Derivatives not accounted for as hedges \| Foreign exchange forwards/options
Derivatives, Fair Value [Line Items]
Notional Amount	4,382	3,390
Fair value of hedge assets	27	58
Fair value of hedge liabilities	$ 69	$ 50
Maximum term of foreign exchange forwards/options, in months	21 months	33 months
Derivatives not accounted for as hedges \| Commodity swaps/options
Derivatives, Fair Value [Line Items]
Notional Amount	$ 3	$ 1
Fair value of hedge assets	0	0
Fair value of hedge liabilities	$ 0	$ 0
Maximum term of commodity swaps/options, in months	0 months	5 months

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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