Unsecured Borrowings - Unsecured Long-Term Borrowings by Maturity Date (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Unsecured Long-Term Debt, Noncurrent	$ 276,914	$ 242,634
Adjustment related to interest rate hedges on certain unsecured long-term borrowings	(7,210)
2026	(52)
2027	(529)
2028	(555)
2029	(590)
2030	(589)
2031 - thereafter	(4,900)
Unsecured Debt
Debt Instrument [Line Items]
2026	11,488
2027	47,425
2028	38,936
2029	32,298
2030	32,985
2031 - thereafter	113,782
Unsecured Long-Term Debt, Noncurrent	$ 276,914

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