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Derivatives (Details-BS) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivatives Fair Value [Line Items]          
Derivative Cash Settlements Received - Commodity $ 34 $ 17 $ 51 $ 41  
Derivative Asset, Fair Value, Gross Asset 10   10   $ 68
Derivative Liability, Fair Value, Gross Liability 5   5   60
Derivative Asset, Fair Value, Net 5   5   8
Derivative, Gain (Loss) on Derivative, Net 22   115    
Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Instruments in Hedges, Assets, at Fair Value         68
Derivative Instruments in Hedges, Liabilities, at Fair Value         0
Derivative Instruments in Hedges, at Fair Value, Net         68
Not Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Liability, Fair Value, Gross Liability 5   5   60
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 5   5   (60)
Derivative Liability, Fair Value, Gross Asset 10   10   0
Commodity [Member] | Not Designated as Hedging Instrument [Member] | Sales [Member]          
Derivatives Fair Value [Line Items]          
Derivative, Gain (Loss) on Derivative, Net   $ (42)   $ (48)  
Commodity Contract [Member] | Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Asset, Fair Value, Gross Asset 10   10    
Derivative Asset, Fair Value, Gross Liability 1   1    
Derivative Asset, Fair Value, Net 9   9    
Commodity Contract [Member] | Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Asset, Fair Value, Gross Asset 0   0   0
Derivative Asset, Fair Value, Gross Liability 4   4   60
Derivative Asset, Fair Value, Net (4)   (4)   (60)
Fair Value Hedging [Member] | Interest rate [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Asset, Fair Value, Gross Asset         3
Derivative Asset, Fair Value, Gross Liability         0
Derivative Asset, Fair Value, Net         3
Fair Value Hedging [Member] | Interest rate [Member] | Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Asset, Fair Value, Gross Asset         1
Derivative Asset, Fair Value, Gross Liability         0
Derivative Asset, Fair Value, Net         1
Cash Flow Hedging [Member] | Interest rate [Member] | Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member]          
Derivatives Fair Value [Line Items]          
Derivative Asset, Fair Value, Net         64
Interest Rate Cash Flow Hedge Asset at Fair Value         64
Interest Rate Cash Flow Hedge Liability at Fair Value         $ 0
Unsecured Debt [Member]          
Derivatives Fair Value [Line Items]          
Debt Instrument, Face Amount $ 1,000   $ 1,000