v3.26.1
Financial Instruments - Schedule of Derivative Assets and Liabilities (Details) - Derivative hedging instruments - Currency risk - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Euro | Forward exchange contracts, selling    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, liabilities ¥ (4,332) ¥ (3,120)
Euro | Forward exchange contracts, buying    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets (2,177) 1,054
United States Dollar | Forward exchange contracts, selling    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, liabilities   1,673
United States Dollar | Forward exchange contracts, buying    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets   (1,693)
United States Dollar | Cross currency interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Hedging instrument, assets 155,015 68,154
Contract amount | Euro | Forward exchange contracts, selling    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount 1,562,772 1,178,796
Contract amount | Euro | Forward exchange contracts, buying    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount 513,196 305,964
Contract amount | United States Dollar | Forward exchange contracts, selling    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount   128,717
Contract amount | United States Dollar | Forward exchange contracts, buying    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount   129,574
Contract amount | United States Dollar | Cross currency interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount 774,089 774,089
Contract amount to be settled in more than one year | Euro | Forward exchange contracts, selling    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount 0 0
Contract amount to be settled in more than one year | Euro | Forward exchange contracts, buying    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount 0 0
Contract amount to be settled in more than one year | United States Dollar | Forward exchange contracts, selling    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount   0
Contract amount to be settled in more than one year | United States Dollar | Forward exchange contracts, buying    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount   0
Contract amount to be settled in more than one year | United States Dollar | Cross currency interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Contract amount ¥ 774,089 ¥ 774,089