Securities (Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Securities
AFS securities, debt securities due in one year or less, amortized cost	$ 251
AFS securities, debt securities due in one year or less, fair value	251
AFS securities, debt securities due after one year through five years, amortized cost	432
AFS securities, debt securities due after one year through five years, fair value	440
AFS securities, debt securities due after five years through ten years, amortized cost	572
AFS securities, debt securities due after five years through ten years, fair value	595
AFS securities, debt securities due after ten years, amortized cost	21,466
AFS securities, debt securities due after ten years, fair value	21,579
Total AFS debt securities, amortized cost	22,721
Total AFS debt securities, fair value	22,865
HTM securities, debt securities due after five years through ten years, amortized cost	5,213
HTM securities, debt securities due after five years through ten years, fair value	4,901
HTM securities, debt securities due after ten years, amortized cost	8,316
HTM securities, debt securities due after ten years, fair value	8,280
Total HTM debt securities, amortized cost	13,529
Total HTM debt securities, fair value	$ 13,181

Available For Sale Securities With Debt Maturities Amortized Cost

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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Amount of investments in debt securities categorized as held-to-maturity valued at amortized cost, excludes other than temporary impairment (OTTI).

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Amount of held-to-maturity debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.

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