Derivatives and Risk Management Activities (Details 6) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative Asset Positions
Gross Position - Asset	$ 133	$ 191
Netting Adjustment	(148)	(148)
Cash collateral paid	161	41
Net Position - Asset	146	84
Derivative Liability Positions
Gross Position - Liability	(157)	(189)
Netting Adjustment	148	148
Net Position - Liability	(9)	(41)
Other current assets
Derivative Asset Positions
Net Position - Asset	116	76
Other long-term assets
Derivative Asset Positions
Net Position - Asset	30	8
Other current liabilities
Derivative Liability Positions
Net Position - Liability	(8)	(3)
Other long term liabilities
Derivative Liability Positions
Net Position - Liability	$ (1)	$ (38)