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Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Offsetting Derivative Assets [Abstract]    
Assets - gross amounts recognized $ 301 $ 311
Assets - gross amounts offset 206 186
Assets - net amounts presented 95 125
Assets - cash collateral 0 0
Assets - amounts without right of setoff 7 4
Assets - net amounts 88 121
Offsetting Derivative Liabilities [Abstract]    
Liabilities - gross amounts recognized 315 310
Liabilities - gross amounts offset 206 186
Liabilities - net amounts presented 109 124
Liabilities - cash collateral 2 7
Liabilities - amounts without right of setoff 3 5
Liabilities - net amounts $ 104 $ 112