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Investment in Securities (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	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized cost	¥ 3,174,036	¥ 3,015,940
Available-for-sale debt securities, Allowance for credit losses	(670)	(634)	¥ (144)
Available-for-sale debt securities, Gross unrealized gains	25,470	41,989
Available-for-sale debt securities, Gross unrealized losses	(591,199)	(391,817)
Available-for-sale debt securities, Fair value	2,607,637	2,665,478
Japanese and foreign government bond securities
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized cost	1,520,672	1,299,025
Available-for-sale debt securities, Allowance for credit losses	0	0
Available-for-sale debt securities, Gross unrealized gains	1,325	11,526
Available-for-sale debt securities, Gross unrealized losses	(429,471)	(275,637)
Available-for-sale debt securities, Fair value	1,092,526	1,034,914
Japanese prefectural and foreign municipal bond securities
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized cost	439,565	425,426
Available-for-sale debt securities, Allowance for credit losses	(245)	(248)
Available-for-sale debt securities, Gross unrealized gains	2,408	2,623
Available-for-sale debt securities, Gross unrealized losses	(34,898)	(26,336)
Available-for-sale debt securities, Fair value	406,830	401,465
Corporate debt securities
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized cost	906,297	905,706
Available-for-sale debt securities, Allowance for credit losses	(34)	0
Available-for-sale debt securities, Gross unrealized gains	15,246	21,415
Available-for-sale debt securities, Gross unrealized losses	(118,964)	(82,542)
Available-for-sale debt securities, Fair value	802,545	844,579
CMBS and RMBS in the Americas
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized cost	106,578	88,586
Available-for-sale debt securities, Allowance for credit losses	0	0
Available-for-sale debt securities, Gross unrealized gains	1,053	929
Available-for-sale debt securities, Gross unrealized losses	(880)	(1,775)
Available-for-sale debt securities, Fair value	106,751	87,740
Other asset-backed securities and debt securities
Schedule of Investments [Line Items]
Available-for-sale debt securities, Amortized cost	200,924	297,197
Available-for-sale debt securities, Allowance for credit losses	(391)	(386)
Available-for-sale debt securities, Gross unrealized gains	5,438	5,496
Available-for-sale debt securities, Gross unrealized losses	(6,986)	(5,527)
Available-for-sale debt securities, Fair value	¥ 198,985	¥ 296,780

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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