v3.25.2
Employee Benefits - Schedule of Breakdown of Fair Value of Plan Assets by Asset Class (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of fair value of plan assets [line items]    
Total plan assets ¥ 347,123 ¥ 391,743
With quoted prices in active markets    
Disclosure of fair value of plan assets [line items]    
Life insurance company general accounts 0 0
Cash and cash equivalent 11,070 10,951
Others 1,640 1,541
Total plan assets 114,332 111,236
No quoted prices in active markets    
Disclosure of fair value of plan assets [line items]    
Life insurance company general accounts 68,741 70,070
Cash and cash equivalent 0 0
Others 27,386 24,736
Total plan assets 232,791 280,507
Japan    
Disclosure of fair value of plan assets [line items]    
Total plan assets 221,422 226,229
Japan | With quoted prices in active markets    
Disclosure of fair value of plan assets [line items]    
Equities 10,531 11,796
Bonds 387 399
Japan | No quoted prices in active markets    
Disclosure of fair value of plan assets [line items]    
Equities 2,315 2,803
Bonds 19,513 17,276
Foreign    
Disclosure of fair value of plan assets [line items]    
Total plan assets 125,701 165,514
Foreign | With quoted prices in active markets    
Disclosure of fair value of plan assets [line items]    
Equities 57,690 53,396
Bonds 33,014 33,153
Foreign | No quoted prices in active markets    
Disclosure of fair value of plan assets [line items]    
Equities 81,589 86,372
Bonds ¥ 33,246 ¥ 79,251