v3.25.2
Other Financial Assets - Summary of Other Financial Assets by Component (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2025
Mar. 31, 2024
Statement [Line Items]    
Current assets ¥ 6,935,759 ¥ 4,702,168
Non-current assets 9,882,841 11,390,559
Other financial assets 16,818,600 16,092,727
Financial assets measured at amortized cost [Member] | Time deposits [Member]    
Statement [Line Items]    
Other financial assets 2,264,841 1,606,834
Financial assets measured at amortized cost [Member] | Other [Member]    
Statement [Line Items]    
Other financial assets 837,954 824,448
Financial assets measured at fair value through profit or loss [Member] | Public and corporate bonds [Member]    
Statement [Line Items]    
Other financial assets 231,713 221,743
Financial assets measured at fair value through profit or loss [Member] | Stocks [Member]    
Statement [Line Items]    
Other financial assets 46,215 212,393
Financial assets measured at fair value through profit or loss [Member] | Investment trusts [Member]    
Statement [Line Items]    
Other financial assets 618,228 553,174
Financial assets measured at fair value through profit or loss [Member] | Derivatives [Member]    
Statement [Line Items]    
Other financial assets 483,378 552,921
Financial assets measured at fair value through other comprehensive income [Member] | Public and corporate bonds [Member]    
Statement [Line Items]    
Other financial assets 9,078,437 8,279,783
Financial assets measured at fair value through other comprehensive income [Member] | Stocks [Member]    
Statement [Line Items]    
Other financial assets 3,246,885 3,829,893
Financial assets measured at fair value through other comprehensive income [Member] | Other [Member]    
Statement [Line Items]    
Other financial assets ¥ 10,947 ¥ 11,537