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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Derivatives, Fair Value [Line Items] |  |
Fair value of hedged assets | $ 58 | $ 65
Fair value of hedged liabilities | 88 | 66
Derivative asset at fair value, current | 56 | 64
Derivative asset at fair value, noncurrent | 2 | 1
Total derivatives, hedge assets at fair value | 58 | 65
Derivative liability at fair value, current | 77 | 59
Derivative liability at fair value, noncurrent | 11 | 7
Total derivatives, hedge liabilities at fair value | 88 | 66
Derivatives accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of hedged assets | 34 | 31
Fair value of hedged liabilities | 67 | 37
Derivatives accounted for as hedges | Foreign exchange forwards/options |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,123 | 874
Fair value of hedged assets | 31 | 27
Fair value of hedged liabilities | $ 28 | $ 8
Maximum term of foreign exchange forwards/options | 18 months | 17 months
Derivatives accounted for as hedges | Commodity swaps/options |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 335 | $ 375
Fair value of hedged assets | 3 | 4
Fair value of hedged liabilities | $ 39 | $ 29
Maximum term of commodity swaps/options | 33 months | 36 months
Derivatives not accounted for as hedges |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of hedged assets | $ 24 | $ 34
Fair value of hedged liabilities | 21 | 29
Derivatives not accounted for as hedges | Foreign exchange forwards/options |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,328 | 2,358
Fair value of hedged assets | 24 | 34
Fair value of hedged liabilities | $ 21 | $ 29
Maximum term of foreign exchange forwards/options | 11 months | 10 months
Derivatives not accounted for as hedges | Commodity swaps/options |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 8 | $ 8
Fair value of hedged assets | 0 | 0
Fair value of hedged liabilities | $ 0 | $ 0
Maximum term of commodity swaps/options | 11 months | 4 months

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