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Securitizations and Variable Interest Entities - Type and Carrying Value of Financial Assets (Detail) (JPY ¥)	Sep. 30, 2014	Mar. 31, 2014
Liabilities [Abstract]
Long-term borrowings	¥ 8,412,012,000,000us-gaap_LongTermDebt	¥ 8,227,063,000,000us-gaap_LongTermDebt
Transferred to SPEs [Member]
Trading assets
Equities	89,000,000,000	99,000,000,000
Debt securities	57,000,000,000	64,000,000,000
Mortgage and mortgage-backed securities	25,000,000,000	23,000,000,000
Long-term loans receivable	7,000,000,000	7,000,000,000
Total	178,000,000,000	193,000,000,000
Liabilities [Abstract]
Long-term borrowings	¥ 167,000,000,000	¥ 182,000,000,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details

- Definition

Amount of investments in debt securities classified as trading.

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- Definition

Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

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