Income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Examination
Tax law change related to currency translation	$ 224	$ 0	$ 0
Undistributed earnings of foreign subsidiaries	15,000
Income taxes paid	3,126	2,949	3,076
Valuation allowance for deferred tax assets	874	934
Penalties	35	36	$ 49
Interest and penalties, accrued	190	$ 135
Final tax assessed, period			10 years
Internal Revenue Service (IRS)
Income Tax Examination
Final tax assessed			$ 490
Interest			250
Tax benefit			$ (41)
U.S. state taxing jurisdictions
Income Tax Examination
Valuation allowance for deferred tax assets	55
Operating loss carryforwards, subject to expiration	75
Operating loss carryforwards, not subject to expiration	16
Domestic Tax Jurisdiction
Income Tax Examination
Valuation allowance for deferred tax assets	192
Operating loss carryforwards, subject to expiration	196
Non-U.S. taxing jurisdictions
Income Tax Examination
Valuation allowance for deferred tax assets	627
Operating loss carryforwards, subject to expiration	278
Operating loss carryforwards, not subject to expiration	$ 781