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Financial and Derivative Instruments (Details 3) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Offsetting Assets [Abstract]    
Derivative Assets, Gross Amount Recognized $ 1,146 $ 3,685
Derivative Assets, Gross Amounts Offset 1,124 3,402
Derivative Assets, Net Amounts Presented 22 283
Derivative Assets, Gross Amounts Not Offset 0 0
Derivative Assets, Net Amounts Presented 22 283
Offsetting Liabilities [Abstract]    
Derivative Liabilities, Gross Amount Recognized 1,187 3,414
Derivative Liabilities, Gross Amounts Offset 1,124 3,402
Derivative Liabilities, Net Amounts Presented 63 12
Derivative Liabilities, Gross Amounts Not Offset 2 0
Derivative Liabilities, Net Amounts Presented $ 61 $ 12