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Derivative instruments and hedging activities - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 07, 2022	Aug. 31, 2026	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Derivative [Line Items]
Revenues other than USD			46.00%		46.00%
Transactions termination loss settled					$ 493
Forward starting interest rate swaps and treasury lock agreements losses			$ 2	$ 5	12	$ 30
Accounts receivables sold			$ 3,837		$ 3,837		$ 3,709
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]			Accounts Payable, Trade, Current		Accounts Payable, Trade, Current		Accounts Payable, Trade, Current
Supplier finance program obligation			$ 242		$ 242		$ 225
Accounts receivable securitization facility
Derivative [Line Items]
Accounts receivables sold			579		579		799
Accounts receivable securitization facility \| BNP Paribas Bank
Derivative [Line Items]
Derivatives term of contract		5 years
Accounts receivable securitization facility \| PNC Bank
Derivative [Line Items]
Derivatives term of contract	3 years
Accounts receivable securitization facility \| PNC Bank \| November 2023
Derivative [Line Items]
Derivative notional amount	$ 1,000
Accounts receivable securitization facility \| PNC Bank \| SPV amendment agreement October 2024
Derivative [Line Items]
Derivative notional amount	950
Accounts receivable securitization facility \| PNC Bank \| Initial commitment
Derivative [Line Items]
Derivative notional amount	$ 950
Accounts receivable
Derivative [Line Items]
Accounts receivables sold			$ 795		$ 795		$ 794