v3.26.1
Employee Benefits - Summary of Amounts Related to Defined Benefit Pension Plans Recognized in Consolidated Statements of Financial Position (Details) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Disclosure of net defined benefit liability (asset) [line items]      
Present value of defined benefit obligations ¥ 420,153 ¥ 384,488  
Fair value of plan assets 390,985 347,123  
Net defined benefit liabilities (assets) 127,576 116,083  
Consolidated statements of financial position      
Net defined benefit liabilities 143,683 135,429  
Net defined benefit asset 16,108 19,346  
Net defined benefit liabilities (assets) 127,576 116,083  
Effect of asset ceiling      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liabilities (assets) (98,407) (78,717) ¥ (63,422)
Consolidated statements of financial position      
Net defined benefit liabilities (assets) (98,407) (78,717) ¥ (63,422)
Japan      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of defined benefit obligations 116,648 130,864  
Fair value of plan assets 224,045 221,422  
Net defined benefit liabilities (assets) (8,998) (11,840)  
Consolidated statements of financial position      
Net defined benefit liabilities 7,047 7,462  
Net defined benefit asset 16,044 19,302  
Net defined benefit liabilities (assets) (8,998) (11,840)  
Japan | Effect of asset ceiling      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liabilities (assets) (98,399) (78,717)  
Consolidated statements of financial position      
Net defined benefit liabilities (assets) (98,399) (78,717)  
Foreign      
Disclosure of net defined benefit liability (asset) [line items]      
Present value of defined benefit obligations 303,505 253,624  
Fair value of plan assets 166,940 125,701  
Net defined benefit liabilities (assets) 136,573 127,922  
Consolidated statements of financial position      
Net defined benefit liabilities 136,637 127,967  
Net defined benefit asset 63 44  
Net defined benefit liabilities (assets) 136,573 127,922  
Foreign | Effect of asset ceiling      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liabilities (assets) (8) 0  
Consolidated statements of financial position      
Net defined benefit liabilities (assets) ¥ (8) ¥ 0