v3.25.4
Transactions Involving Related Parties - Summary of Balance Sheet Impact of Transactions with Parent and Affiliated Companies (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Mar. 31, 2025
Other liabilities:    
Operating lease liabilities $ 49 $ 55
Affiliated Entity    
Finance receivables, net:    
Unearned subsidy income (749) (731)
Investment in operating leases, net:    
Unearned subsidy income (1,090) (1,290)
Due from Parent and affiliated companies 96 146
Debt:    
Due to Parent and affiliated companies 144 181
Other liabilities:    
Accrued benefit expenses 65 65
Operating lease liabilities 6 8
Related Party    
Debt:    
Related party debt 0 1,800
Accrued interest expense:    
Related party debt $ 0 $ 11