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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) (JPY ¥) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | ¥ 821,550 | ¥ 714,190
Available-for-sale securities, Gross unrealized gains | 62,522 | 47,477
Available-for-sale securities, Gross unrealized losses | (2,466) | (4,368)
Available-for-sale securities, Fair value | 881,606 | 757,299
Held-to-maturity securities, Amortized cost | 96,731 | 89,451
Held-to-maturity securities, Fair value | 104,036 |
Amortized cost | 918,281 | 803,641
Gross unrealized gains | 69,827 | 56,497
Gross unrealized losses | (2,466) | (4,368)
Fair value | 985,642 | 855,770
Japanese and foreign government bond securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 359,148 | 276,832
Available-for-sale securities, Gross unrealized gains | 1,230 | 1,906
Available-for-sale securities, Gross unrealized losses | (18) | (21)
Available-for-sale securities, Fair value | 360,360 | 278,717
Japanese prefectural and foreign municipal bond securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 93,927 | 58,571
Available-for-sale securities, Gross unrealized gains | 2,913 | 2,519
Available-for-sale securities, Gross unrealized losses | (143) | 0
Available-for-sale securities, Fair value | 96,697 | 61,090
Corporate debt securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 199,340 | 193,973
Available-for-sale securities, Gross unrealized gains | 2,601 | 3,809
Available-for-sale securities, Gross unrealized losses | (555) | (947)
Available-for-sale securities, Fair value | 201,386 | 196,835
Specified bonds issued by SPEs in Japan |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 6,850 | 64,159
Available-for-sale securities, Gross unrealized gains | 70 | 116
Available-for-sale securities, Gross unrealized losses | (148) | (1,031)
Available-for-sale securities, Fair value | 6,772 | 63,244
CMBS and RMBS in the U.S., and other asset-backed securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 64,789 | 59,419
Available-for-sale securities, Gross unrealized gains | 1,883 | 3,480
Available-for-sale securities, Gross unrealized losses | (1,041) | (2,208)
Available-for-sale securities, Fair value | 65,631 | 60,691
Other Debt Securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 9,508 | 7,367
Available-for-sale securities, Gross unrealized gains | 2,042 | 944
Available-for-sale securities, Gross unrealized losses | 0 | 0
Available-for-sale securities, Fair value | 11,550 | 8,311
Equity securities |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, Amortized cost | 87,988 | 53,869
Available-for-sale securities, Gross unrealized gains | 51,783 | 34,703
Available-for-sale securities, Gross unrealized losses | (561) | (161)
Available-for-sale securities, Fair value | 139,210 | 88,411
Japanese Government Bond Securities |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity securities, Amortized cost | 96,731 | 89,451
Held-to-maturity securities, Gross unrealized gains | 7,305 | 9,020
Held-to-maturity securities, Gross unrealized losses | 0 | 0
Held-to-maturity securities, Fair value | ¥ 104,036 | ¥ 98,471

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