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Long-term Debt - Additional Information (Detail) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Long-term debt, fair value	$ 9,300,000,000	$ 9,400,000,000
Committed credit facility agreement aggregated	5,000,000,000
Borrowings outstanding under credit facility	0	0
Short-term borrowings and current portion of long-term debt	1,938,000,000	1,894,000,000
Commercial paper programs mature in February 2029
Debt Instrument [Line Items]
Committed credit facility agreement aggregated	2,000,000,000
Commercial Paper Programs Maturing December 2030
Debt Instrument [Line Items]
Committed credit facility agreement aggregated	3,000,000,000
Commercial paper borrowings
Debt Instrument [Line Items]
Long-term debt		$ 0
Short-term borrowings and current portion of long-term debt	$ 800,000,000

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