Securities (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Securities
Securities available for sale, debt securities due in one year or less, amortized cost	$ 144
Securities available for sale, debt securities due in one year or less, fair value	144
Securities available for sale, debt securities due after one year through five years, amortized cost	200
Securities available for sale, debt securities due after one year through five years, fair value	204
Securities available for sale, debt securities due after five years through ten years, amortized cost	657
Securities available for sale, debt securities due after five years through ten years, fair value	698
Securities available for sale, debt securities due after ten years, amortized cost	22,124
Securities available for sale, debt securities due after ten years, fair value	23,052
Total available for sale debt securities, amortized cost	23,125
Total available for sale debt securities, fair value	24,098
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	1,323
Securities held to maturity, debt securities due after five years through ten years, fair value	1,326
Securities held to maturity, debt securities due after ten years, amortized cost	11,816
Securities held to maturity, debt securities due after ten years, fair value	12,118
Total held to maturity debt securities, amortized cost	13,140
Total held to maturity debt securities, fair value	$ 13,445

Available For Sale Securities With Debt Maturities Amortized Cost

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