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Financial and Derivative Instruments (Details 2) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Offsetting Assets [Abstract]    
Derivative Assets, Gross Amount Recognized $ 2,700 $ 1,169
Derivative Assets, Gross Amounts Offset 2,693 1,147
Derivative Assets, Net Amounts Presented 7 22
Derivative Assets, Gross Amounts Not Offset 0 0
Derivative Assets, Net Amounts Presented 7 22
Offsetting Liabilities [Abstract]    
Derivative Liabilities, Gross Amount Recognized 2,877 1,271
Derivative Liabilities, Gross Amounts Offset 2,693 1,147
Derivative Liabilities, Net Amounts Presented 184 124
Derivative Liabilities, Gross Amounts Not Offset 0 0
Derivative Liabilities, Net Amounts Presented $ 184 $ 124