Postemployment benefit plans - Company costs related to U.S. and non-U.S. defined contribution plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure
Costs related to defined contribution plans	$ 835	$ 741	$ 681
U.S. plans
Defined Benefit Plan Disclosure
Costs related to defined contribution plans	696	610	567
Non-U.S. plans
Defined Benefit Plan Disclosure
Costs related to defined contribution plans	$ 139	$ 131	$ 114

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details