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Investment Securities (Details 1) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Amount of interest income from taxable and non-taxable investment securities        
Taxable $ 382 $ 317 $ 733 $ 650
Non-taxable 77 77 154 154
Total interest income from investment securities $ 459 $ 394 $ 887 $ 804