v3.26.1
Employee Benefits - Schedule of Sensitivity Analysis for Actuarial Assumptions (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.50%  
Percentage of reasonably possible decrease in actuarial assumption (0.50%)  
Japan | Discount Rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption (0.50%) (0.50%)
Increase (decrease) in defined benefit obligation due to increase in assumption ¥ (5,919) ¥ (7,178)
Increase (decrease) in defined benefit obligation due to decrease in assumption ¥ 6,540 ¥ 7,914
Japan | Future Salary Increases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption (0.50%) (0.50%)
Increase (decrease) in defined benefit obligation due to increase in assumption ¥ 0 ¥ 0
Increase (decrease) in defined benefit obligation due to decrease in assumption ¥ 0 ¥ 0
Foreign | Discount Rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption (0.50%) (0.50%)
Increase (decrease) in defined benefit obligation due to increase in assumption ¥ (15,920) ¥ (14,452)
Increase (decrease) in defined benefit obligation due to decrease in assumption ¥ 17,903 ¥ 16,049
Foreign | Future Salary Increases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption (0.50%) (0.50%)
Increase (decrease) in defined benefit obligation due to increase in assumption ¥ 5,668 ¥ 4,871
Increase (decrease) in defined benefit obligation due to decrease in assumption ¥ (5,092) ¥ (4,397)