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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, 2024 | Mar. 31, 2023
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Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |
Revolving repayment card loans (Gross write-offs) | ¥ 780 |
Modification of collection condition by relief of contract condition (Gross write-offs) | 138 |
Total—revolving repayment card loans (Gross write-offs) | 918 |
Total— origination year (excluding revolving repayment card loans) (Gross write-offs) | 62,275 |
Total— financial assets measured at amortized cost (Gross write-offs) | 63,193 |
Performing |  |
Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |
Revolving repayment card loans | 72,353 | ¥ 166,392
Modification of collection condition by relief of contract condition | 0 | 0
Total—revolving repayment card loans | 72,353 | 166,392
Total— origination year (excluding revolving repayment card loans) | 4,785,497 | 4,518,503
Total— financial assets measured at amortized cost | 4,857,850 | 4,684,895
Non-Performing |  |
Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |
Revolving repayment card loans | 0 | 1,588
Modification of collection condition by relief of contract condition | 0 | 3,655
Total—revolving repayment card loans | 0 | 5,243
Total— origination year (excluding revolving repayment card loans) | 109,381 | 93,608
Total— financial assets measured at amortized cost | ¥ 109,381 | ¥ 98,851

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