v3.25.2
Income Taxes (Operating Loss and Tax Credit Carryforwards) (Detail)
¥ in Millions
Mar. 31, 2025
JPY (¥)
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards ¥ 199,246
Tax credit carryforwards 9,268
2026  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 53,901
Tax credit carryforwards 315
2027  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 886
Tax credit carryforwards 292
2028  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 1,833
Tax credit carryforwards 153
2029  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 13,175
Tax credit carryforwards 346
2030  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 67,607
Tax credit carryforwards 183
2031  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 7,143
Tax credit carryforwards 247
2031 and thereafter  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 5,394
Tax credit carryforwards 5,911
No definite expiration date  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 49,307
Tax credit carryforwards ¥ 1,821