v3.26.1
Income Taxes (Operating Loss and Tax Credit Carryforwards) (Detail)
¥ in Millions
Mar. 31, 2026
JPY (¥)
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards ¥ 131,039
Tax credit carryforwards 6,375
2027  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 417
Tax credit carryforwards 475
2028  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 1,286
Tax credit carryforwards 331
2029  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 10,544
Tax credit carryforwards 173
2030  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 41,168
Tax credit carryforwards 377
2031  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 15,151
Tax credit carryforwards 199
2032  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 1,339
Tax credit carryforwards 281
2033 and thereafter  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 6,979
Tax credit carryforwards 2,646
No definite expiration date  
Operating Loss and Tax Credit Carryforwards [Line Items]  
Operating loss carryforwards 54,155
Tax credit carryforwards ¥ 1,893