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Investment Securities (Details 3) (USD $)
In Millions
Jun. 30, 2011
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]  
Due within 1 year $ 2,549
Due after 1 year through 5 years 824
Due after 5 years through 10 years 268
Due after 10 years 5,408
Total 9,049
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 2,560
Estimated Fair Value, Due after 1 year through 5 years 839
Estimated Fair Value, Due after 5 years through 10 years 279
Estimated Fair Value, Due after 10 years 5,207
Total $ 8,885