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Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) In Millions | Mar. 31, 2011 USD ($) | Mar. 31, 2011 JPY (¥) | Mar. 31, 2010 JPY (¥) | Mar. 31, 2011 Level 1 USD ($) | Mar. 31, 2011 Level 1 JPY (¥) | Mar. 31, 2010 Level 1 JPY (¥) | Mar. 31, 2011 Level 1 Trading securities USD ($) | Mar. 31, 2011 Level 1 Trading securities JPY (¥) | Mar. 31, 2010 Level 1 Trading securities JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities USD ($) | Mar. 31, 2011 Level 1 Available-for-sale securities JPY (¥) | Mar. 31, 2010 Level 1 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities Japanese and foreign government bond securities USD ($) | Mar. 31, 2011 Level 1 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2010 Level 1 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities Japanese prefectural and foreign municipal bond securities USD ($) | Mar. 31, 2010 Level 1 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities Corporate debt securities USD ($) | Mar. 31, 2010 Level 1 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities Specified bonds issued by SPEs in Japan USD ($) | Mar. 31, 2010 Level 1 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities USD ($) | Mar. 31, 2010 Level 1 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Level 1 Available-for-sale securities Equity securities USD ($) | Mar. 31, 2011 Level 1 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2010 Level 1 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2011 Level 1 Other securities USD ($) | Mar. 31, 2010 Level 1 Other securities JPY (¥) | Mar. 31, 2011 Level 1 Other securities Investment funds USD ($) | Mar. 31, 2010 Level 1 Other securities Investment funds JPY (¥) | Mar. 31, 2011 Level 1 Interest rate swap agreements USD ($) | Mar. 31, 2010 Level 1 Interest rate swap agreements JPY (¥) | Mar. 31, 2011 Level 1 Futures, Foreign exchange contracts USD ($) | Mar. 31, 2011 Level 1 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2010 Level 1 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Level 1 Foreign currency swap agreements USD ($) | Mar. 31, 2010 Level 1 Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Level 1 Credit derivatives held/written USD ($) | Mar. 31, 2010 Level 1 Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Level 1 Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Level 1 Options Held (Written), Caps Held and Other USD ($) | Mar. 31, 2011 Level 2 USD ($) | Mar. 31, 2011 Level 2 JPY (¥) | Mar. 31, 2010 Level 2 JPY (¥) | Mar. 31, 2011 Level 2 Trading securities USD ($) | Mar. 31, 2011 Level 2 Trading securities JPY (¥) | Mar. 31, 2010 Level 2 Trading securities JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities USD ($) | Mar. 31, 2011 Level 2 Available-for-sale securities JPY (¥) | Mar. 31, 2010 Level 2 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities Japanese and foreign government bond securities USD ($) | Mar. 31, 2011 Level 2 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2010 Level 2 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities Japanese prefectural and foreign municipal bond securities USD ($) | Mar. 31, 2011 Level 2 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2010 Level 2 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities Corporate debt securities USD ($) | Mar. 31, 2011 Level 2 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2010 Level 2 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities Specified bonds issued by SPEs in Japan USD ($) | Mar. 31, 2010 Level 2 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities USD ($) | Mar. 31, 2011 Level 2 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2010 Level 2 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Level 2 Available-for-sale securities Equity securities USD ($) | Mar. 31, 2011 Level 2 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2010 Level 2 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2011 Level 2 Other securities USD ($) | Mar. 31, 2011 Level 2 Other securities JPY (¥) | Mar. 31, 2010 Level 2 Other securities JPY (¥) | Mar. 31, 2011 Level 2 Other securities Investment funds USD ($) | Mar. 31, 2011 Level 2 Other securities Investment funds JPY (¥) | Mar. 31, 2010 Level 2 Other securities Investment funds JPY (¥) | Mar. 31, 2011 Level 2 Interest rate swap agreements USD ($) | Mar. 31, 2011 Level 2 Interest rate swap agreements JPY (¥) | Mar. 31, 2010 Level 2 Interest rate swap agreements JPY (¥) | Mar. 31, 2011 Level 2 Futures, Foreign exchange contracts USD ($) | Mar. 31, 2011 Level 2 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2010 Level 2 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Level 2 Foreign currency swap agreements USD ($) | Mar. 31, 2011 Level 2 Foreign currency swap agreements JPY (¥) | Mar. 31, 2010 Level 2 Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Level 2 Credit derivatives held/written USD ($) | Mar. 31, 2011 Level 2 Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Level 2 Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Level 2 Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Level 2 Options Held (Written), Caps Held and Other USD ($) | Mar. 31, 2011 Level 2 Options Held (Written), Caps Held and Other JPY (¥) | Mar. 31, 2011 Level 3 USD ($) | Mar. 31, 2011 Level 3 JPY (¥) | Mar. 31, 2010 Level 3 JPY (¥) | Mar. 31, 2011 Level 3 Trading securities USD ($) | Mar. 31, 2010 Level 3 Trading securities JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities USD ($) | Mar. 31, 2011 Level 3 Available-for-sale securities JPY (¥) | Mar. 31, 2010 Level 3 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities Japanese and foreign government bond securities USD ($) | Mar. 31, 2010 Level 3 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities Japanese prefectural and foreign municipal bond securities USD ($) | Mar. 31, 2010 Level 3 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities Corporate debt securities USD ($) | Mar. 31, 2011 Level 3 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2010 Level 3 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities Specified bonds issued by SPEs in Japan USD ($) | Mar. 31, 2011 Level 3 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2010 Level 3 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities USD ($) | Mar. 31, 2011 Level 3 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2010 Level 3 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Level 3 Available-for-sale securities Equity securities USD ($) | Mar. 31, 2010 Level 3 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2011 Level 3 Other securities USD ($) | Mar. 31, 2010 Level 3 Other securities JPY (¥) | Mar. 31, 2011 Level 3 Other securities Investment funds USD ($) | Mar. 31, 2010 Level 3 Other securities Investment funds JPY (¥) | Mar. 31, 2011 Level 3 Interest rate swap agreements USD ($) | Mar. 31, 2010 Level 3 Interest rate swap agreements JPY (¥) | Mar. 31, 2011 Level 3 Futures, Foreign exchange contracts USD ($) | Mar. 31, 2010 Level 3 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Level 3 Foreign currency swap agreements USD ($) | Mar. 31, 2010 Level 3 Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Level 3 Credit derivatives held/written USD ($) | Mar. 31, 2011 Level 3 Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Level 3 Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Level 3 Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Level 3 Options Held (Written), Caps Held and Other USD ($) | Mar. 31, 2011 Level 3 Options Held (Written), Caps Held and Other JPY (¥) | Mar. 31, 2011 Trading securities USD ($) | Mar. 31, 2011 Trading securities JPY (¥) | Mar. 31, 2010 Trading securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities USD ($) | Mar. 31, 2010 Available-for-sale securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Japanese and foreign government bond securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Japanese and foreign government bond securities USD ($) | 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 JPY (¥) | Mar. 31, 2011 Available-for-sale securities Japanese prefectural and foreign municipal bond securities USD ($) | Mar. 31, 2010 Available-for-sale securities Japanese prefectural and foreign municipal bond securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Corporate debt securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Corporate debt securities USD ($) | 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 ($) | Mar. 31, 2011 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2010 Available-for-sale securities Specified bonds issued by SPEs in Japan JPY (¥) | Mar. 31, 2011 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities USD ($) | Mar. 31, 2011 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2010 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2011 Available-for-sale securities Equity securities USD ($) | Mar. 31, 2010 Available-for-sale securities Equity securities JPY (¥) | Mar. 31, 2011 Other securities JPY (¥) | Mar. 31, 2011 Other securities USD ($) | Mar. 31, 2010 Other securities JPY (¥) | Mar. 31, 2011 Other securities Investment funds USD ($) | Mar. 31, 2011 Other securities Investment funds JPY (¥) | Mar. 31, 2010 Other securities Investment funds JPY (¥) | Mar. 31, 2011 Interest rate swap agreements JPY (¥) | Mar. 31, 2011 Interest rate swap agreements USD ($) | Mar. 31, 2010 Interest rate swap agreements JPY (¥) | Mar. 31, 2011 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Futures, Foreign exchange contracts USD ($) | Mar. 31, 2010 Futures, Foreign exchange contracts JPY (¥) | Mar. 31, 2011 Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Foreign currency swap agreements USD ($) | Mar. 31, 2010 Foreign currency swap agreements JPY (¥) | Mar. 31, 2011 Credit derivatives held/written JPY (¥) | Mar. 31, 2011 Credit derivatives held/written USD ($) | Mar. 31, 2010 Credit derivatives held/written JPY (¥) | Mar. 31, 2010 Options held/written, Caps held JPY (¥) | Mar. 31, 2011 Options Held (Written), Caps Held and Other JPY (¥) | Mar. 31, 2011 Options Held (Written), Caps Held and Other USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measured on recurring basis investments |  |  |  |  |  |  | $ 9 | ¥ 763 | ¥ 1,157 | $ 901 | ¥ 74,914 | ¥ 67,224 | $ 241 | ¥ 19,995 | ¥ 0 | $ 0 | ¥ 0 | $ 0 | ¥ 0 | $ 0 | ¥ 0 | $ 0 | ¥ 0 | $ 660 | ¥ 54,919 | ¥ 67,224 | $ 0 | ¥ 0 | $ 0 | ¥ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 857 | ¥ 71,228 | ¥ 48,386 | $ 5,926 | ¥ 492,820 | ¥ 376,206 | $ 1,796 | ¥ 149,350 | ¥ 146,453 | $ 420 | ¥ 34,968 | ¥ 19,247 | $ 3,481 | ¥ 289,459 | ¥ 192,450 | $ 0 | ¥ 0 | $ 31 | ¥ 2,591 | ¥ 700 | $ 198 | ¥ 16,452 | ¥ 17,356 | $ 121 | ¥ 10,023 | ¥ 14,692 | $ 121 | ¥ 10,023 | ¥ 14,692 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | ¥ 53 | $ 3,797 | ¥ 315,676 | ¥ 401,804 | $ 0 | ¥ 0 | $ 0 | ¥ 0 | $ 31 | ¥ 2,573 | ¥ 6,841 | $ 2,674 | ¥ 222,314 | ¥ 246,305 | $ 1,092 | ¥ 90,789 | ¥ 148,658 | $ 0 | ¥ 0 | $ 0 | ¥ 0 | $ 0 | ¥ 0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 866 | ¥ 71,991 | ¥ 49,596 | ¥ 883,410 | $ 10,624 | ¥ 845,234 | ¥ 169,345 | $ 2,037 | ¥ 146,453 | ¥ 34,968 | $ 420 | ¥ 19,247 | ¥ 292,032 | $ 3,512 | ¥ 199,291 | $ 2,674 | ¥ 222,314 | ¥ 246,305 | $ 1,123 | ¥ 93,380 | ¥ 149,358 | ¥ 71,371 | $ 858 | ¥ 84,580 | ¥ 10,023 | $ 121 | ¥ 14,692 | $ 121 | ¥ 10,023 | ¥ 14,692 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets | 276 | 22,985 | 17,074 | 16 | 1,306 | 1,015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 16 | 1,306 | 1,013 | 0 | 0 | 0 | 0 | 2 | 0 | 222 | 18,497 | 15,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 | 2,070 | 192 | 16 | 1,327 | 1,062 | 177 | 14,766 | 13,724 | 0 | 1 | 0 | 553 | 4 | 333 | 38 | 3,182 | 528 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 48 | 528 | 0 | 37 | 3,134 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,070 | 25 | 192 | 2,633 | 32 | 2,075 | 14,766 | 177 | 13,724 | 49 | 1 | 528 | 555 | 3,467 | 41
Financial assets | 11,887 | 988,409 | 926,596 | 926 | 76,983 | 69,396 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,126 | 592,568 | 454,815 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,835 | 318,858 | 402,385 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities | 506 | 42,076 | 31,975 | 12 | 977 | 660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 12 | 977 | 660 | 0 | 0 | 0 | 0 | 0 | 0 | 491 | 40,863 | 31,280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16 | 1,320 | 2,956 | 48 | 3,991 | 5,077 | 402 | 33,481 | 23,053 | 0 | 0 | 5 | 189 | 25 | 2,071 | 3 | 236 | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 236 | 35 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,320 | 16 | 2,956 | 4,968 | 60 | 5,737 | 33,481 | 402 | 23,053 | 236 | 3 | 40 | 189 | 2,071 | 25
Financial liabilities | $ 506 | ¥ 42,076 | ¥ 31,975 | $ 12 | ¥ 977 | ¥ 660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 491 | ¥ 40,863 | ¥ 31,280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 | ¥ 236 | ¥ 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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