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Financial Instruments (Schedule of the Fair Value of Derivative Instruments) (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset derivatives | [1] | $ 182 | $ 74
Liability derivatives | [1] | 121 | 84
Derivative assets and liabilities subject to master netting arrangement |  | 114 | 35
Other accrued liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash collateral | [2] | 52 | 7
Not Designated as Hedging Instrument [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liability derivatives |  | 121 | 84
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Accounts and notes receivable, net [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset derivatives | [2] | 182 | 74
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other accrued liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liability derivatives |  | 121 | 80
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other accrued liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liability derivatives |  | $ 0 | $ 4
[1] | The company's derivative assets and liabilities subject to enforceable master netting arrangements totaled $114 and $35 at December 31, 2016 and 2015.
[2] | Cash collateral held as of December 31, 2016 and 2015 is related to foreign currency derivatives not related to hedging instruments.

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