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Derivative and Other Financial Instruments (Fair Values of Outstanding Derivative Instruments in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative assets |  |
Total | $ 63 | $ 45
Derivative liabilities |  |
Total | 23 | 37
Level 2 |  |
Derivative assets |  |
Total | 63 | 45
Derivative liabilities |  |
Total | 23 | 37
Derivatives designated as hedges: | Other current assets | Foreign exchange | Level 2 |  |
Derivative assets |  |
Foreign exchange | 12 | 24
Derivatives designated as hedges: | Other current assets | Commodities | Level 2 |  |
Derivative assets |  |
Commodities | 25 | 13
Derivatives designated as hedges: | Other non-current assets | Commodities | Level 2 |  |
Derivative assets |  |
Commodities | 4 | 3
Derivatives designated as hedges: | Accounts payable and accrued liabilities | Foreign exchange | Level 2 |  |
Derivative liabilities |  |
Foreign exchange, designated as hedges | 8 | 28
Derivatives designated as hedges: | Accounts payable and accrued liabilities | Commodities | Level 2 |  |
Derivative liabilities |  |
Commodities | 0 | 3
Derivatives designated as hedges: | Other non-current liabilities | Foreign exchange | Level 2 |  |
Derivative liabilities |  |
Foreign exchange, designated as hedges | 0 | 1
Derivatives not designated as hedges: | Other current assets | Commodities | Level 2 |  |
Derivative assets |  |
Commodities | 22 | 5
Derivatives not designated as hedges: | Accounts payable and accrued liabilities | Foreign exchange | Level 2 |  |
Derivative liabilities |  |
Foreign exchange, not designated as hedges | 0 | 5
Derivatives not designated as hedges: | Accounts payable and accrued liabilities | Commodities | Level 2 |  |
Derivative liabilities |  |
Commodities | $ 15 | $ 0

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