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Derivative Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Gain or loss recorded on cash flow hedging relationships        
Unrealized gain loss on cash flow hedges net of tax accumulated other comprehensive income loss $ (14) $ (23) $ 65 $ 60
Interest Income [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Cash Flow Hedge Gain (Loss) Reclassified to Interest Expense, Net, Total (6) (18) (15) (36)
Derivative related income [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net, Total (4) 4 (1) (3)
Interest rate swaps [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) Recognized in OCI on Interest Rate Swaps (53) (33) 37 22
Interest rate swaps [Member] | Interest Income [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) Reclassed from Accumulated OCI into Income on Interest Rate Swaps (1) (12) (4) (23)
Interest rate swaps [Member] | Derivative related income [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) Recognized in Income on Interest Rate Swaps (1)     2
Currency swaps [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) Recognized in OCI on Currency Swaps 39 10 28 38
Currency swaps [Member] | Interest Income [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) Reclassed from Accumulated OCI into Income on Currency Swaps (5) (6) (11) (13)
Currency swaps [Member] | Derivative related income [Member]
       
Gain or loss recorded on cash flow hedging relationships        
Gain (Loss) Recognized in Income on Currency Swaps $ (3) $ 4 $ (1) $ (5)