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Financial and Derivative Instruments (Details 3) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Offsetting Assets [Abstract]    
Derivative Assets, Gross Amount Recognized $ 1,269 $ 3,685
Derivative Assets, Gross Amounts Offset 1,267 3,402
Derivative Assets, Net Amounts Presented 2 283
Derivative Assets, Gross Amounts Not Offset 1 0
Derivative Assets, Net Amounts Presented 1 283
Offsetting Liabilities [Abstract]    
Derivative Liabilities, Gross Amount Recognized 1,312 3,414
Derivative Liabilities, Gross Amounts Offset 1,267 3,402
Derivative Liabilities, Net Amounts Presented 45 12
Derivative Liabilities, Gross Amounts Not Offset 3 0
Derivative Liabilities, Net Amounts Presented $ 42 $ 12