v3.25.2
Income Taxes - Summary of Income Tax Expense (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure of current and deferred tax expense benefit [Line items]      
Current income tax expense ¥ 1,737,922 ¥ 2,056,433 ¥ 843,674
Deferred income tax expense (benefit) (113,087) (162,768) 332,091
Income tax expense 1,624,835 1,893,665 1,175,765
TMC and domestic subsidiaries [Member]      
Disclosure of current and deferred tax expense benefit [Line items]      
Current income tax expense 965,512 1,432,299 758,772
Deferred income tax expense (benefit) (131,329) (42,906) 27,783
Foreign subsidiaries [Member]      
Disclosure of current and deferred tax expense benefit [Line items]      
Current income tax expense 772,410 624,134 84,902
Deferred income tax expense (benefit) ¥ 18,242 ¥ (119,862) ¥ 304,308