v3.25.2
Fair Value Measurements - Summary of Carrying Values and Fair Values of Financial Instruments Except for those Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Assets    
Dealer loans, net $ 4,576 $ 4,335
Retail loans, net 49,698 48,181
Liabilities    
Commercial paper 6,751 6,022
Related party debt 1,000 1,800
Bank loans 2,663 2,100
Medium-term note program 38,010 37,153
Other debt 3,301 3,088
Secured debt 12,700 12,384
Fair value    
Assets    
Dealer loans, net 4,186 3,940
Retail loans, net 49,795 48,102
Liabilities    
Commercial paper 6,751 6,023
Related party debt 999 1,800
Bank loans 2,665 2,099
Medium-term note program 37,855 36,795
Other debt 3,355 3,130
Secured debt 12,807 12,472
Fair value | Level 1    
Assets    
Dealer loans, net 0 0
Retail loans, net 0 0
Liabilities    
Commercial paper 0 0
Related party debt
Bank loans 0 0
Medium-term note program 0 0
Other debt 0 0
Secured debt 0 0
Fair value | Level 2    
Assets    
Dealer loans, net 0 0
Retail loans, net 0 0
Liabilities    
Commercial paper 6,751 6,023
Related party debt 999 1,800
Bank loans 2,665 2,099
Medium-term note program 37,855 36,795
Other debt 3,355 3,130
Secured debt 12,807 12,472
Fair value | Level 3    
Assets    
Dealer loans, net 4,186 3,940
Retail loans, net 49,795 48,102
Liabilities    
Commercial paper 0 0
Related party debt
Bank loans 0 0
Medium-term note program 0 0
Other debt 0 0
Secured debt $ 0 $ 0