Securities (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Securities
Securities available for sale, debt securities due in one year or less, amortized cost	$ 185
Securities available for sale, debt securities due in one year or less, fair value	185
Securities available for sale, debt securities due after one year through five years, amortized cost	195
Securities available for sale, debt securities due after one year through five years, fair value	199
Securities available for sale, debt securities due after five years through ten years, amortized cost	635
Securities available for sale, debt securities due after five years through ten years, fair value	668
Securities available for sale, debt securities due after ten years, amortized cost	23,323
Securities available for sale, debt securities due after ten years, fair value	24,015
Total available for sale debt securities, amortized cost	24,338
Total available for sale debt securities, fair value	25,067
Securities held to maturity, debt securities due in one year or less, amortized cost	1
Securities held to maturity, debt securities due in one year or less, fair value	1
Securities held to maturity, debt securities due after five years through ten years, amortized cost	501
Securities held to maturity, debt securities due after five years through ten years, fair value	502
Securities held to maturity, debt securities due after ten years, amortized cost	12,074
Securities held to maturity, debt securities due after ten years, fair value	12,241
Total held to maturity debt securities, amortized cost	12,576
Total held to maturity debt securities, fair value	$ 12,744

Available For Sale Securities With Debt Maturities Amortized Cost

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