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Derivative Financial Instruments (Details 3) (Interest rate contracts [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Other Assets [Member]
   
Fair value of derivative instruments, designated and qualifying as cash flow hedges    
Derivative Assets $ 40 $ 29
Interest Taxes and Other Liabilities [Member]
   
Fair value of derivative instruments, designated and qualifying as cash flow hedges    
Derivative Liabilities $ 261 $ 248