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Financial and Derivative Instruments Financial and Derivative Instruments (Details 2) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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