Pension and other postretirement benefits - Schedule of Target Allocation Ranges (Details)	Dec. 31, 2024
United States | Minimum | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Minimum | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Maximum | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Maximum | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Assets held by insurance company
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Minimum | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Pension Plans | Minimum | Equity instruments | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Pension Plans | Minimum | Equity instruments | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
United States | Pension Plans | Minimum | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Pension Plans | Minimum | Debt instrument | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Pension Plans | Minimum | Debt instrument | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	65.00%
United States | Pension Plans | Minimum | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
United States | Pension Plans | Maximum | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Pension Plans | Maximum | Equity instruments | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Pension Plans | Maximum | Equity instruments | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	30.00%
United States | Pension Plans | Maximum | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Maximum | Debt instrument | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Maximum | Debt instrument | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	85.00%
United States | Pension Plans | Maximum | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
Non-U.S. | Pension Plans | Minimum | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Minimum | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	15.00%
Non-U.S. | Pension Plans | Minimum | Equity instruments | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Non-U.S. | Pension Plans | Minimum | Equity instruments | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	1.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	25.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	24.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	32.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument | Government inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	23.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	9.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument | Inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	9.00%
Non-U.S. | Pension Plans | Minimum | Debt instrument | Structured debt
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	9.00%
Non-U.S. | Pension Plans | Minimum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Minimum | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Minimum | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Minimum | Assets held by insurance company
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	0.00%
Non-U.S. | Pension Plans | Maximum | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Maximum | Equity instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	25.00%
Non-U.S. | Pension Plans | Maximum | Equity instruments | Developed markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	24.00%
Non-U.S. | Pension Plans | Maximum | Equity instruments | Emerging markets
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	2.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	40.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument | Non-government debt instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	35.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument | Government fixed interest instruments
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	44.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument | Government inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	31.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument | Asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument | Inflation-protected bonds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Non-U.S. | Pension Plans | Maximum | Debt instrument | Structured debt
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	16.00%
Non-U.S. | Pension Plans | Maximum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	10.00%
Non-U.S. | Pension Plans | Maximum | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%
Non-U.S. | Pension Plans | Maximum | Assets held by insurance company
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges	5.00%