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Installment Loans (Contractual Maturities of Installment Loans Except Purchased Loans) (Detail) ¥ in Millions	Mar. 31, 2025 JPY (¥)
Debt Disclosure [Abstract]
2026	¥ 662,965
2027	417,293
2028	334,136
2029	236,224
2030	276,454
Thereafter	2,132,558
Total	¥ 4,059,630

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- Definition

Contractual Maturities of Installment Loans

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Contractual Maturities of Installment Loans Current

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- Definition

Contractual Maturities of Installment Loans in Five Years

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- Definition

Contractual Maturities of Installment Loans in Four Years

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- Definition

Contractual Maturities of Installment Loans in Three Years

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- Definition

Contractual Maturities of Installment Loans in Two Years

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Contractual Maturities of Installment Loans Thereafter

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