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Derivatives and Risk Management Activities (Details 2) (USD $)
In Millions, unless otherwise specified
 2 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2013
PNG
contract
Jan. 31, 2011
Forward starting interest rate swaps terminated in January 2011
contract
Dec. 31, 2013
10 forward starting interest rate swaps (30-year)
Cash flow hedge
contract
Aug. 31, 2013
5 forward starting interest rate swaps (30-year)
contract
Aug. 31, 2013
5 forward starting interest rate swaps (30-year)
Interest expense
Dec. 31, 2012
6 forward starting interest rate swaps (30-year)
contract
Mar. 31, 2012
4 forward starting interest rate swaps (10-year)
contract
Interest Rate Risk Hedging                
Net deferred losses from interest rate risk hedging included in AOCI $ (65)              
Number of outstanding interest rate swaps (in contracts)       10        
Rate of fixed interest to be received on interest rate swap (as a percent)     3.60% 3.60% 3.39%   4.24% 3.46%
Notional amount of derivatives     100 250 125   250 200
Number of interest rate swaps that terminated (in contracts)   3 3   5   6 4
Cash payment for (proceeds from) termination of interest rate swaps     (12)   (11)   89 24
Gain on derivative instruments deferred in AOCI         8      
Gain on derivative instruments recognized in interest expense attributable to the ineffective portion of the swaps           $ 3