Debt - Assets and Liabilities Related to Asset-backed Debt Arrangements (Detail) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] | ||
| Prepaid expenses and other | $ 7,382 | $ 8,336 |
| Other assets | 22,547 | 23,248 |
| Accounts payable and accrued liabilities | 21,932 | 24,981 |
| Debt maturing within one year | 28,229 | 18,618 |
| Long-term debt | 144,231 | 139,532 |
| Variable Interest Entity, Primary Beneficiary | ||
| Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] | ||
| Accounts receivable, net | 18,547 | 18,421 |
| Prepaid expenses and other | 98 | 298 |
| Other assets | 12,246 | 11,753 |
| Accounts payable and accrued liabilities | 38 | 34 |
| Debt maturing within one year | 17,166 | 14,863 |
| Long-term debt | $ 12,742 | $ 12,204 |