v3.25.2
Derivative financial instruments - Disclosure of Fair Value Measurement of Derivative Assets and Liabilities (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of detailed information about hedges [line items]    
Current assets - Other financial assets ¥ 6,935,759 ¥ 4,702,168
Non-current assets - Other financial assets 9,882,841 11,390,559
Total 16,818,600 16,092,727
Total derivative assets 483,378 552,921
Current liabilities - Other financial liabilities (1,869,117) (1,700,137)
Non-current liabilities - Other financial liabilities (435,594) (495,814)
Total (2,304,711) (2,195,951)
Total derivative liabilities (319,881) (432,189)
At fair value [Member] | Interest rate and currency swap [Member] | Derivative not designated as hedge [Member]    
Disclosure of detailed information about hedges [line items]    
Current assets - Other financial assets 118,941 180,657
Non-current assets - Other financial assets 276,647 355,245
Total 395,588 535,901
Current liabilities - Other financial liabilities (60,584) (91,120)
Non-current liabilities - Other financial liabilities (243,087) (286,396)
Total (303,670) (377,516)
At fair value [Member] | Foreign exchange forward, option and other contracts [Member] | Derivative not designated as hedge [Member]    
Disclosure of detailed information about hedges [line items]    
Current assets - Other financial assets 62,945 17,006
Non-current assets - Other financial assets 24,845 14
Total 87,790 17,019
Current liabilities - Other financial liabilities (14,711) (54,086)
Non-current liabilities - Other financial liabilities (1,500) (588)
Total ¥ (16,211) ¥ (54,673)