v3.26.1
Credit Quality of Financial Assets and the Allowance for Credit Losses - Summary of Allowance for Credit Losses for Installment Loans (Parenthetical) (Detail) - JPY (¥)
¥ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]      
Provision for credit losses ¥ 34,017 ¥ 18,723 ¥ 20,968
Total charge-offs 19,901 19,304 63,473
Purchased loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total charge-offs 3,763 7,547 47,722
Purchased loans | Financial asset acquired with credit deterioration      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total charge-offs ¥ 3,633 ¥ 7,507 ¥ 47,676