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Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Allowance for Credit Losses for Installment Loans (Detail) (Parenthetical) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowances for credit loss gross up value | ¥ 6,901 | ¥ 2,210 | ¥ 3,899
Total charge-offs | 28,372 | 24,897 | 37,432
Allowance for Credit Losses | 64,723 | 69,459 | 78,945
Provision for credit losses | 7,756 | 3,939 | 16,021
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total charge-offs | 7,142 | 2,372 | 4,040
Purchased loans | Financial asset acquired with credit deterioration |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total charge-offs | ¥ 6,901 | ¥ 2,210 | 3,899
Accounting Standards Update 2016-13 |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowances for credit loss gross up value |  |  | ¥ 176,714

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