Finance Receivables - Narrative (Detail) - USD ($) $ in Millions |
9 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Financing receivables | $ 54,214 | $ 52,516 | $ 51,966 |
| Retail loans and leases threshold delinquent (percent) (more than) | 10.00% | ||
| Retail loans | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Financing receivables | $ 49,720 | 48,181 | |
| Collateral Pledged | Retail loans | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Financing receivables | $ 15,000 | $ 13,000 |