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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Fair value of hedged assets	$ 38	$ 54
Fair value of hedged liabilities	104	96
Derivative asset at fair value, current	36	54
Derivative asset at fair value, noncurrent	2	0
Total derivatives, hedge assets at fair value	38	54
Derivative liability at fair value, current	96	79
Derivative liability at fair value, noncurrent	8	17
Total derivatives, hedge liabilities at fair value	104	96
Derivatives accounted for as hedges
Derivatives, Fair Value [Line Items]
Fair value of hedged assets	23	32
Fair value of hedged liabilities	65	74
Derivatives accounted for as hedges | Foreign exchange forwards/options
Derivatives, Fair Value [Line Items]
Notional Amount	937	886
Fair value of hedged assets	17	31
Fair value of hedged liabilities	$ 20	$ 8
Maximum term of foreign exchange forwards/options	12 months	12 months
Derivatives accounted for as hedges | Commodity swaps/options
Derivatives, Fair Value [Line Items]
Notional Amount	$ 306	$ 322
Fair value of hedged assets	6	1
Fair value of hedged liabilities	$ 45	$ 66
Maximum term of commodity swaps/options	31 months	33 months
Derivatives not accounted for as hedges
Derivatives, Fair Value [Line Items]
Fair value of hedged assets	$ 15	$ 22
Fair value of hedged liabilities	39	22
Derivatives not accounted for as hedges | Foreign exchange forwards/options
Derivatives, Fair Value [Line Items]
Notional Amount	2,065	2,886
Fair value of hedged assets	15	22
Fair value of hedged liabilities	$ 39	$ 21
Maximum term of foreign exchange forwards/options	10 months	11 months
Derivatives not accounted for as hedges | Commodity swaps/options
Derivatives, Fair Value [Line Items]
Notional Amount	$ 4	$ 7
Fair value of hedged assets	0	0
Fair value of hedged liabilities	$ 0	$ 1
Maximum term of commodity swaps/options	3 months	6 months

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