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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Revolving Repayment Card Loans (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |
Revolving repayment card loans (Gross write-offs) | ¥ 0 | ¥ 780
Modification of collection condition by relief of contract condition (Gross write-offs) | 0 | 138
Total—revolving repayment card loans (Gross write-offs) | 0 | 918
Total— origination year (excluding revolving repayment card loans) (Gross write-offs) | 19,028 | 62,275
Total— financial assets measured at amortized cost (Gross write-offs) | 19,028 | 63,193
Performing |  |
Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |
Revolving repayment card loans | 67,874 | 72,353
Modification of collection condition by relief of contract condition | 0 | 0
Total—revolving repayment card loans | 67,874 | 72,353
Total— origination year (excluding revolving repayment card loans) | 4,895,662 | 4,785,497
Total— financial assets measured at amortized cost | 4,963,536 | 4,857,850
Non-Performing |  |
Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |
Revolving repayment card loans | 0 | 0
Modification of collection condition by relief of contract condition | 0 | 0
Total—revolving repayment card loans | 0 | 0
Total— origination year (excluding revolving repayment card loans) | 163,322 | 109,381
Total— financial assets measured at amortized cost | ¥ 163,322 | ¥ 109,381

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