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Amortized Cost Basis Amounts, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Values of Available-for-Sale Securities and Held-to-Maturity Securities in Each Major Security Type (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 CMBS and RMBS in the U.S., and other asset-backed securities Available-for-sale securities USD ($) | Mar. 31, 2011 CMBS and RMBS in the U.S., and other asset-backed securities Available-for-sale securities JPY (¥) | Mar. 31, 2010 CMBS and RMBS in the U.S., and other asset-backed securities Available-for-sale securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities USD ($) | Mar. 31, 2011 Available-for-sale securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Japanese and foreign government bond securities USD ($) | Mar. 31, 2011 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Japanese prefectural and foreign municipal bond securities USD ($) | Mar. 31, 2011 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Corporate debt securities USD ($) | Mar. 31, 2011 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan USD ($) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2010 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Available-for-sale securities Equity securities USD ($) | Mar. 31, 2011 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2011 Held-to-maturity Securities Japanese Government Bond Securities JPY (¥) | Mar. 31, 2011 Held-to-maturity Securities Japanese Government Bond Securities USD ($) | Mar. 31, 2010 Held-to-maturity Securities Japanese Government Bond Securities JPY (¥)
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Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost | $ 10,914 | ¥ 907,480 | ¥ 876,921 | $ 1,123 | ¥ 93,416 | ¥ 146,820 | $ 10,388 | ¥ 863,785 | ¥ 833,189 | $ 2,030 | ¥ 168,818 | ¥ 146,007 | $ 420 | ¥ 34,907 | ¥ 19,238 | $ 3,522 | ¥ 292,836 | ¥ 199,937 | $ 2,711 | ¥ 225,393 | ¥ 249,696 | $ 582 | ¥ 48,415 | ¥ 71,491 | ¥ 43,695 | $ 526 | ¥ 43,732
Gross unrealized gains | 380 | 31,642 | 29,399 | 47 | 3,819 | 10,759 | 375 | 31,230 | 29,399 | 8 | 696 | 624 | 1 | 153 | 69 | 15 | 1,287 | 910 | 1 | 46 | 303 | 303 | 25,229 | 16,734 | 412 | 5 | 0
Gross unrealized losses | (139) | (11,605) | (18,069) | (47) | (3,855) | (8,221) | (139) | (11,605) | (17,354) | (1) | (169) | (178) | (1) | (92) | (60) | (25) | (2,091) | (1,556) | (38) | (3,125) | (3,694) | (27) | (2,273) | (3,645) | 0 | 0 | (715)
Fair value | $ 11,155 | ¥ 927,517 | ¥ 888,251 | $ 1,123 | ¥ 93,380 | ¥ 149,358 | $ 10,624 | ¥ 883,410 | ¥ 845,234 | $ 2,037 | ¥ 169,345 | ¥ 146,453 | $ 420 | ¥ 34,968 | ¥ 19,247 | $ 3,512 | ¥ 292,032 | ¥ 199,291 | $ 2,674 | ¥ 222,314 | ¥ 246,305 | $ 858 | ¥ 71,371 | ¥ 84,580 | ¥ 44,107 | $ 531 | ¥ 43,017

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