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Derivatives and Risk Management Activities (Details 2) (USD $)
 1 Months Ended
Sep. 30, 2013
Sep. 30, 2013
PNG
contract
Sep. 30, 2013
10 forward starting swaps (30-year)
contract
Aug. 31, 2013
5 forward starting swaps (30-year)
contract
Aug. 31, 2013
5 forward starting swaps (30-year)
Interest expense
Interest Rate Risk Hedging          
Net deferred losses from interest rate risk hedging included in AOCI $ (76,000,000)        
Number of outstanding interest rate swaps (in contracts)   3 10    
Notional amount of interest rate cash flow hedge derivatives     250,000,000    
Rate of fixed interest to be received on interest rate swap (as a percent)   0.95% 3.60%    
Notional amount of interest rate derivatives   100,000,000      
Number of interest rate swaps that terminated (in contracts)       5  
Proceeds from termination of interest rate swaps       11,000,000  
Gain on derivative instruments deferred in AOCI         3,000,000
Gain on derivative instruments recognized in interest expense attributable to the ineffective portion       $ 8,000,000