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Financial and Derivative Instruments Financial and Derivative Instruments - Effect of Netting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Offsetting Assets [Abstract]    
Derivative Asset, Gross Amount Recognized $ 3,685 $ 1,169
Derivative Asset, Gross Amounts Offset 3,402 1,147
Derivative Asset, Net Amounts Presented 283 22
Derivative Asset, Gross Amounts Not Offset 0 0
Derivative Asset, Net Amount 283 22
Offsetting Liabilities [Abstract]    
Derivative Liability, Gross Amount Recognized 3,414 1,271
Derivative Liability, Gross Amounts Offset 3,402 1,147
Derivative Liability, Net Amounts Presented 12 124
Derivative Liability, Gross Amounts Not Offset 0 0
Derivative Liability, Net Amount $ 12 $ 124