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Financial Instruments - Terminated Swaps (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Amortization of fair value adjustments for terminated swaps $ 49 $ 53 $ 28
Expected net decrease to interest expense in future years through 2018 $ 142