Securities (Details 4) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Securities by Maturity
Amortized cost of securities available for sale, Due in one year or less	$ 950
Amortized cost of securities available for sale, Due after one through five years	11,748
Amortized cost of securities available for sale, Due after five through ten years	66
Amortized cost of securities available for sale, Due after ten years	4
Total amortized cost of securities available for sale	12,768
Fair Value of securities available for sale, Due in one year or less	966
Fair Value of securities available for sale, Due after one through five years	12,163
Fair Value of securities available for sale, Due after five through ten years	72
Fair Value of securities available for sale, Due after ten years	4
Total Fair Value of securities available for sale	13,205
Amortized cost of held-to-maturity securities, Due in one year or less	5
Amortized cost of held-to-maturity securities, Due after one through five years	4,347
Amortized cost of held-to-maturity securities, Due after five through ten years
Amortized cost of held-to-maturity securities, Due after ten years
Total amortized cost of held-to-maturity securities	4,352
Fair Value of held-to-maturity securities, Due in one year or less	5
Fair Value of held-to-maturity securities, Due after one through five years	4,391
Fair Value of held-to-maturity securities, Due after five through ten years
Fair Value of held-to-maturity securities, Due after ten years
Total Fair Value of held-to-maturity securities	$ 4,396

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