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Price Risk Management Price Risk Management (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Derivative, Collateral, Master Netting Arrangements, Letters of Credit $ 10   $ 10   $ 7
Net gain or loss recognized in the statement of income offset by regulatory accounting 52 (56) 64 (59)  
Derivative, Net Liability Position, Aggregate Fair Value 112   112    
Collateral Already Posted, Aggregate Fair Value 18   18    
Collateral Aggregate Fair Value 98   98    
Margin Deposit Assets $ 2   $ 2   $ 9