v3.25.4
Segment and Geographic Information - Financial Information for Reportable Segments (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Number of reportable segments          
Number of reportable segments | segment     2    
Revenues:          
Retail $ 788 $ 713 $ 2,336 $ 2,027  
Dealer 69 74 209 222  
Operating leases 1,812 1,625 5,382 4,751  
Total revenues 2,669 2,412 7,927 7,000  
Leased vehicle expenses 1,218 1,105 3,607 3,244  
Interest expense 692 632 2,072 1,799  
Realized (gains)/losses on derivatives and foreign    currency denominated debt 86 33 233 78  
Net revenues 673 642 2,015 1,879  
Other income, net 42 37 134 117  
Total net revenues 715 679 2,149 1,996  
Expenses:          
General and administrative expenses 150 152 510 428  
Provision for credit losses 126 70 315 228  
Early termination loss on operating leases 138 40 265 95  
Income before income taxes and valuation adjustments 301 417 1,059 1,245  
Gain/(loss) on derivative instruments 46 551 (559) 351  
Gain/(loss) on foreign currency revaluation of debt 23 (489) 675 (230)  
Income before income taxes and valuation adjustments 318 388 1,176 1,202  
Income tax expense 2 95 214 326  
Assets          
Finance receivables, net 54,214 51,966 54,214 51,966 $ 52,516
Investment in operating leases, net 32,458 29,598 32,458 29,598 30,596
Total assets 92,171 85,186 92,171 85,186 $ 88,969
Operating Segments | United States          
Revenues:          
Retail 706 642 2,094 1,823  
Dealer 65 68 195 203  
Operating leases 1,614 1,424 4,776 4,129  
Total revenues 2,385 2,134 7,065 6,155  
Leased vehicle expenses 1,077 956 3,172 2,779  
Interest expense 640 573 1,909 1,615  
Realized (gains)/losses on derivatives and foreign    currency denominated debt 78 34 213 94  
Net revenues 590 571 1,771 1,667  
Other income, net 37 33 118 105  
Total net revenues 627 604 1,889 1,772  
Expenses:          
General and administrative expenses 136 138 468 386  
Provision for credit losses 123 67 292 218  
Early termination loss on operating leases 137 39 263 94  
Income before income taxes and valuation adjustments 231 360 866 1,074  
Income tax expense (19) 84 157 288  
Assets          
Finance receivables, net 48,789 47,061 48,789 47,061  
Investment in operating leases, net 28,995 26,294 28,995 26,294  
Total assets 82,896 76,691 82,896 76,691  
Operating Segments | Canada          
Revenues:          
Retail 82 71 242 204  
Dealer 4 6 14 19  
Operating leases 198 201 606 622  
Total revenues 284 278 862 845  
Leased vehicle expenses 141 149 435 465  
Interest expense 52 59 163 184  
Realized (gains)/losses on derivatives and foreign    currency denominated debt 8 (1) 20 (16)  
Net revenues 83 71 244 212  
Other income, net 5 4 16 12  
Total net revenues 88 75 260 224  
Expenses:          
General and administrative expenses 14 14 42 42  
Provision for credit losses 3 3 23 10  
Early termination loss on operating leases 1 1 2 1  
Income before income taxes and valuation adjustments 70 57 193 171  
Income tax expense 21 11 57 38  
Assets          
Finance receivables, net 5,425 4,905 5,425 4,905  
Investment in operating leases, net 3,463 3,304 3,463 3,304  
Total assets $ 9,275 $ 8,495 $ 9,275 $ 8,495