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Derivatives and Risk Management Activities (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Interest Rate Risk Hedging  
Net deferred losses from interest rate risk hedging included in AOCI $ (123)
PNG
  
Interest Rate Risk Hedging  
Number of outstanding interest rate swaps (in contracts) 3
Rate of fixed interest to be received on interest rate swap (as a percent) 0.95%
Notional amount of interest rate derivatives 100
Number of interest rate swaps that terminate in June 2014 (in contracts) 2
Number of interest rate swaps that terminate in August 2014 (in contracts) 1
5 forward starting swaps (30-year)
  
Interest Rate Risk Hedging  
Number of outstanding interest rate swaps (in contracts) 5
Notional amount of interest rate cash flow hedge derivatives 125
Rate of fixed interest to be received on interest rate swap (as a percent) 3.39%
10 forward starting swaps (30-year)
  
Interest Rate Risk Hedging  
Number of outstanding interest rate swaps (in contracts) 10
Notional amount of interest rate cash flow hedge derivatives $ 250
Rate of fixed interest to be received on interest rate swap (as a percent) 3.60%