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Derivatives and Hedging (Details 2) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Other current assets
  
Aggregate carrying amount of derivatives  
Interest rate swaps, fair value hedges $ 4
Other assets
  
Aggregate carrying amount of derivatives  
Interest rate swaps, fair value hedges3517
Other long-term liabilities
  
Aggregate carrying amount of derivatives  
Interest rate swaps, cash flow hedges$ 19$ 13