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Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Offsetting Derivative Assets [Abstract]    
Assets - gross amounts recognized $ 377 $ 450
Assets - amounts without right of setoff 10 9
Assets - gross amounts 367 441
Assets - gross amounts offset 267 280
Assets - net amounts presented 100 161
Assets - cash collateral 0 0
Assets - net amounts 100 161
Offsetting Derivative Liabilities [Abstract]    
Liabilities - gross amounts recognized 358 400
Liabilities - amounts without right of setoff 5 4
Liabilities - gross amounts recognized 353 396
Liabilities - gross amounts offset 267 280
Liabilities - net amounts presented 86 116
Liabilities - cash collateral 7 10
Liabilities - net amounts $ 79 $ 106