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Summary of the Contractual Maturities of Debt Securities Classified as Available-for-Sale Securities and Held-to-Maturity Securities (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥)
--- | --- | ---
Available-for-sale securities, amortized cost |  |
Due within one year | $ 2,230 | ¥ 185,404
Due after one to five years | 5,078 | 422,260
Due after five to ten years | 1,816 | 150,967
Due after ten years | 682 | 56,739
Available-for-sale Securities, Debt Maturities, Amortized Cost, Total | 9,806 | 815,370
Available-for-sale securities, fair value |  |
Due within one year | 2,230 | 185,404
Due after one to five years | 5,044 | 419,450
Due after five to ten years | 1,809 | 150,362
Due after ten years | 683 | 56,823
Available-for-sale Securities, Debt Maturities, Fair Value, Total | 9,766 | 812,039
Held-to-maturity securities, amortized cost |  |
Due after ten years | 526 | 43,695
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount, Total | 526 | 43,695
Held-to-maturity securities, fair value |  |
Due after ten years | 531 | 44,107
Held-to-maturity Securities, Debt Maturities, Fair Value, Total | $ 531 | ¥ 44,107

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