Securities (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Securities
Securities available for sale, debt securities due in one year or less, amortized cost	$ 179
Securities available for sale, debt securities due in one year or less, fair value	179
Securities available for sale, debt securities due after one year through five years, amortized cost	186
Securities available for sale, debt securities due after one year through five years, fair value	188
Securities available for sale, debt securities due after five years through ten years, amortized cost	652
Securities available for sale, debt securities due after five years through ten years, fair value	685
Securities available for sale, debt securities due after ten years, amortized cost	22,734
Securities available for sale, debt securities due after ten years, fair value	23,322
Total available for sale debt securities, amortized cost	23,751
Total available for sale debt securities, fair value	24,374
Total available for sale securities with no stated maturity, amortized cost	6
Total available for sale securities with no stated maturity, fair value	6
Total available for sale securities, amortized cost	23,757
Total available for sale securities, fair value	24,380
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	499
Securities held to maturity, debt securities due after ten years, amortized cost	12,983
Securities held to maturity, debt securities due after ten years, fair value	13,007
Total held to maturity debt securities, amortized cost	13,485
Total held to maturity debt securities, fair value	13,507
Total held to maturity securities, amortized cost	13,485
Total held to maturity securities, fair value	$ 13,507

Available For Sale Securities With Debt Maturities Amortized Cost

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This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified neither as held-to-maturity nor trading securities.

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For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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This item represents the amortized cost, prior to other than temporary impairment (OTTI), of investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity. The temporary impairments arise from the unrealized losses that are recognized in AOCI.

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