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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivative Asset Positions    
Gross Position - Asset $ 280 $ 493
Netting Adjustment (38) (262)
Cash collateral received (156) (133)
Net Position - Asset 86 98
Derivative Liability Positions    
Gross Position - Liability (110) (384)
Netting Adjustment 38 262
Net Position - Liability (72) (122)
Other current assets    
Derivative Asset Positions    
Net Position - Asset 76 71
Other long-term assets, net    
Derivative Asset Positions    
Net Position - Asset 10 27
Other current liabilities    
Derivative Liability Positions    
Net Position - Liability (38) (91)
Other long-term liabilities and deferred credits    
Derivative Liability Positions    
Net Position - Liability $ (34) $ (31)