v3.25.2
Finance Receivables - Summary of Aging Analysis of Past Due Finance Receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Past Due [Line Items]    
Total finance receivables $ 52,912 $ 47,601
Total past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 657 528
30 – 59 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 504 403
60 – 89 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 118 98
90 days or greater past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 35 27
Current or less than 30 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 52,255 47,073
Retail    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 48,568 43,541
Retail | New automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 38,529 34,185
Retail | Used and certified automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 8,494 7,991
Retail | Motorcycle and other    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1,545 1,365
Retail | Total past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 656 527
Retail | Total past due | New automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 424 327
Retail | Total past due | Used and certified automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 203 176
Retail | Total past due | Motorcycle and other    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 29 24
Retail | 30 – 59 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 504 402
Retail | 30 – 59 days past due | New automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 331 253
Retail | 30 – 59 days past due | Used and certified automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 155 134
Retail | 30 – 59 days past due | Motorcycle and other    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 18 15
Retail | 60 – 89 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 118 98
Retail | 60 – 89 days past due | New automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 73 59
Retail | 60 – 89 days past due | Used and certified automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 38 33
Retail | 60 – 89 days past due | Motorcycle and other    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 7 6
Retail | 90 days or greater past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 34 27
Retail | 90 days or greater past due | New automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 20 15
Retail | 90 days or greater past due | Used and certified automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 10 9
Retail | 90 days or greater past due | Motorcycle and other    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 4 3
Retail | Current or less than 30 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 47,912 43,014
Retail | Current or less than 30 days past due | New automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 38,105 33,858
Retail | Current or less than 30 days past due | Used and certified automobile    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 8,291 7,815
Retail | Current or less than 30 days past due | Motorcycle and other    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1,516 1,341
Dealer    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 4,344 4,060
Dealer | Wholesale flooring    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 3,006 2,786
Dealer | Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1,338 1,274
Dealer | Total past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1 1
Dealer | Total past due | Wholesale flooring    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1 1
Dealer | Total past due | Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 0
Dealer | 30 – 59 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 1
Dealer | 30 – 59 days past due | Wholesale flooring    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 1
Dealer | 30 – 59 days past due | Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 0
Dealer | 60 – 89 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 0
Dealer | 60 – 89 days past due | Wholesale flooring    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 0
Dealer | 60 – 89 days past due | Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 0
Dealer | 90 days or greater past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1 0
Dealer | 90 days or greater past due | Wholesale flooring    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 1 0
Dealer | 90 days or greater past due | Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 0 0
Dealer | Current or less than 30 days past due    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 4,343 4,059
Dealer | Current or less than 30 days past due | Wholesale flooring    
Financing Receivable, Past Due [Line Items]    
Total finance receivables 3,005 2,785
Dealer | Current or less than 30 days past due | Commercial loans    
Financing Receivable, Past Due [Line Items]    
Total finance receivables $ 1,338 $ 1,274