Finance Receivables - Summary of Activity in Allowance for Credit Losses of Finance Receivables (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Mar. 31, 2025 |
|
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |||||
| Beginning balance | $ 430 | $ 412 | $ 396 | $ 353 | $ 353 |
| Provision | 126 | 70 | 315 | 228 | |
| Charge-offs | (131) | (111) | (362) | (287) | |
| Recoveries | 37 | 32 | 113 | 109 | |
| Effect of translation adjustment | 1 | (1) | 1 | (1) | |
| Ending balance | 463 | 402 | 463 | 402 | 396 |
| Retail | |||||
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |||||
| Beginning balance | 421 | 404 | 387 | 345 | 345 |
| Provision | 126 | 69 | 315 | 227 | |
| Charge-offs | (131) | (111) | (362) | (287) | |
| Recoveries | 37 | 32 | 113 | 109 | |
| Effect of translation adjustment | 1 | (1) | 1 | (1) | |
| Ending balance | 454 | 393 | 454 | 393 | 387 |
| Dealer | |||||
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |||||
| Beginning balance | 9 | 8 | 9 | 8 | 8 |
| Provision | 0 | 1 | 0 | 1 | |
| Charge-offs | 0 | 0 | 0 | 0 | |
| Recoveries | 0 | 0 | 0 | 0 | |
| Effect of translation adjustment | 0 | 0 | 0 | 0 | |
| Ending balance | $ 9 | $ 9 | $ 9 | $ 9 | $ 9 |