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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 | Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024
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Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |  |
Revolving repayment card loans (Gross write-offs) | ¥ 0 |  | ¥ 0
Modification of collection condition by relief of contract condition (Gross write-offs) | 0 |  | 0
Total—revolving repayment card loans (Gross write-offs) | 0 |  | 0
Total— origination year (excluding revolving repayment card loans) (Gross write-offs) | 8,390 |  | 6,498
Total— financial assets measured at amortized cost (Gross write-offs) | 8,390 |  | ¥ 6,498
Performing |  |  |
Details Of Financial Assets Including Revolving Repayment Card Loans [Line Items] |  |  |
Revolving repayment card loans | 65,759 | ¥ 67,874 |
Modification of collection condition by relief of contract condition | 0 | 0 |
Total—revolving repayment card loans | 65,759 | 67,874 |
Total— origination year (excluding revolving repayment card loans) | 5,069,197 | 4,895,662 |
Total— financial assets measured at amortized cost | 5,134,956 | 4,963,536 |
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) | 167,717 | 163,322 |
Total— financial assets measured at amortized cost | ¥ 167,717 | ¥ 163,322 |

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