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Risk Management Not Designated as Hedges Location Effect on Income Statements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (7) $ 4 $ 30
Energy Related Derivative      
Derivative [Line Items]      
Loss on Derivative Instruments, Pretax 4    
Derivative, Gain on Derivative   57 73
Revenues—Natural gas sales | Energy Related Derivative      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 3 20 (10)
Revenues—Product sales and other | Energy Related Derivative      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (12) (16) (26)
Cost of Sales [Member] | Energy Related Derivative      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 2 0 3
Interest Expense [Member] | Interest Rate Contract      
Derivative [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0 $ 0 $ 63
Other Current Liabilities [Member] | Contract and Over the Counter | Energy Related Derivative      
Derivative [Line Items]      
Derivative, Collateral, Right to Reclaim Cash $ 16