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Financial and Derivative Instruments Financial and Derivative Instruments (Details 2) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Offsetting Assets [Abstract] |  |
Derivative Asset, Gross Amount Recognized | $ 1,169 | $ 1,052
Derivative Asset, Gross Amounts Offset | 1,147 | 1,020
Derivative Asset, Net Amounts Presented | 22 | 32
Derivative Asset, Gross Amounts Not Offset | 0 | 0
Derivative Asset, Net Amount | 22 | 32
Offsetting Liabilities [Abstract] |  |
Derivative Liability, Gross Amount Recognized | 1,271 | 1,129
Derivative Liability, Gross Amounts Offset | 1,147 | 1,020
Derivative Liability, Net Amounts Presented | 124 | 109
Derivative Liability, Gross Amounts Not Offset | 0 | 0
Derivative Liability, Net Amount | $ 124 | $ 109

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