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Derivative Financial Instruments (Details) (Interest rate contracts [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Other Assets [Member]
   
Fair value of derivative instruments that are designated and their location on the Balance Sheet    
Fair value hedge assets $ 5 $ 4
Interest Taxes and Other Liabilities [Member]
   
Fair value of derivative instruments that are designated and their location on the Balance Sheet    
Fair value hedge liabilities $ 983 $ 1,134