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Derivatives and Hedging Activities (Details Textuals) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Fair Value Hedging [Member]
Dec. 31, 2010
Fair Value Hedging [Member]
Jun. 30, 2011
Cash flow hedges [Member]
Dec. 31, 2010
Cash flow hedges [Member]
Derivatives and Hedging Activities (Textuals) [Abstract]                
Net reduction in interest expense on long term debt and other $ 126,000,000 $ 130,000,000 $ 251,000,000 $ 262,000,000        
Net pretax losses on derivatives reclassified from AOCI into earnings     100,000          
Derivative [Line Items]                
Notional amount of long-term debt         $ 16,400,000,000 $ 15,900,000,000 $ 784,000,000,000 $ 1,300,000,000