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Securities - Amortized Cost and Fair Value of Debt Securities Available for Sale by Contractual Maturity (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]  
Due in one year or less, Amortized cost $ 1,195
Due after one year through five years, Amortized cost 2,557
Due after five years through ten years, Amortized cost 2,295
Due after ten years, Amortized cost 14,451
Total debt securities available for sale, Amortized cost 20,498
Due in one year or less, Fair value 1,202
Due after one year through five years, Fair value 2,578
Due after five years through ten years, Fair value 2,231
Due after ten years, Fair value 14,792
Total securities available-for-sale, Fair Value $ 20,803