v3.25.4
Transactions Involving Related Parties - Narrative (Detail) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
AHM    
Related Party Transaction [Line Items]    
Dividends $ 562 $ 536
HCFI | HMC    
Related Party Transaction [Line Items]    
Honda Motor Company required ownership interest (percentage) 80.00%  
HCFI | AHFC    
Related Party Transaction [Line Items]    
Dividends $ 74 74
HCFI | HCI    
Related Party Transaction [Line Items]    
Dividends $ 68 $ 68
AHFC | HMC    
Related Party Transaction [Line Items]    
Honda Motor Company required ownership interest (percentage) 80.00%