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Information about Available-for-Sale Securities and Held-to-Maturity Securities with Gross Unrealized Losses and the Length of Time that Individual Securities Have Been in a Continuous Unrealized Loss Position (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, 2010 Held-to-maturity Securities Japanese Government Bond Securities JPY (¥)
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Investments, Unrealized Loss Position [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less than 12 months Fair value |  |  | ¥ 290,876 | $ 80 | ¥ 6,660 | ¥ 17,578 | $ 4,054 | ¥ 337,103 | ¥ 247,859 | $ 763 | ¥ 63,438 | ¥ 81,432 | $ 270 | ¥ 22,444 | ¥ 12,480 | $ 2,215 | ¥ 184,185 | ¥ 88,305 | $ 591 | ¥ 49,180 | ¥ 30,189 | $ 135 | ¥ 11,196 | ¥ 17,875 |  | ¥ 43,017
Less than 12 months Gross unrealized losses |  |  | (7,279) | (11) | (853) | (2,141) | (80) | (6,680) | (6,564) | (1) | (169) | (99) | (1) | (92) | (60) | (25) | (2,071) | (484) | (25) | (2,025) | (1,041) | (17) | (1,470) | (2,739) |  | (715)
12 months or more Fair value |  |  | 183,784 | 328 | 27,276 | 65,070 | 1,005 | 83,545 | 183,784 | 0 | 0 | 4,768 | 0 | 0 | 0 | 24 | 1,980 | 26,100 | 594 | 49,398 | 83,024 | 59 | 4,891 | 4,822 |  | 0
12 months or more Gross unrealized losses |  |  | (10,790) | (36) | (3,002) | (6,080) | (59) | (4,925) | (10,790) | 0 | 0 | (79) | 0 | 0 | 0 | 0 | (20) | (1,072) | (13) | (1,100) | (2,653) | (10) | (803) | (906) |  | 0
Total Fair value |  |  | 474,660 | 408 | 33,936 | 82,648 | 5,059 | 420,648 | 431,643 | 763 | 63,438 | 86,200 | 270 | 22,444 | 12,480 | 2,239 | 186,165 | 114,405 | 1,185 | 98,578 | 113,213 | 194 | 16,087 | 22,697 |  | 43,017
Total 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 | ¥ (715)

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