Debt - Borrowings and Repayments (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt
Debt repayments	$ 5,163	$ 4,570
Net proceeds	4,993	$ 4,412
Commercial Paper Program [Member]
Debt
Commercial paper repayments	4,700
Commercial paper borrowings	$ 5,000
3.125% senior notes due March 2025 [Member]
Debt
Interest rate (as a percent)	3.125%
Debt repayments	$ 422
Senior Notes 0.750 Percent Due November 2025 [Member]
Debt
Interest rate (as a percent)	0.75%