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Pension and other postretirement benefits - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Funded status $ 105 $ 100  
Benefit obligation 105 100 $ 129
United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Funded status 47 51  
Benefit obligation 496 497 677
Non-U.S. | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation 11 11  
Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Funded status (110) (211)  
Benefit obligation $ 2,414 2,105 $ 3,136
Equity instruments | Minimum | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 10.00%    
Equity instruments | Minimum | United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 10.00%    
Equity instruments | Minimum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 15.00%    
Equity instruments | Minimum | Republic of Ireland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 10.00%    
Equity instruments | Minimum | Switzerland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 25.00%    
Equity instruments | Maximum | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 30.00%    
Equity instruments | Maximum | United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 30.00%    
Equity instruments | Maximum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 25.00%    
Equity instruments | Maximum | Republic of Ireland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 20.00%    
Equity instruments | Maximum | Switzerland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 35.00%    
Debt instrument | Minimum | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 65.00%    
Debt instrument | Minimum | United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 65.00%    
Debt instrument | Minimum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 20.00%    
Debt instrument | Minimum | Republic of Ireland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 45.00%    
Debt instrument | Minimum | Switzerland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 25.00%    
Debt instrument | Maximum | United States      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 85.00%    
Debt instrument | Maximum | United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 85.00%    
Debt instrument | Maximum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 35.00%    
Debt instrument | Maximum | Republic of Ireland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 55.00%    
Debt instrument | Maximum | Switzerland      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 55.00%    
Real estate | United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 0.00%    
Real estate | Minimum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 5.00%    
Real estate | Maximum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 10.00%    
Other | United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 0.00%    
Other | Minimum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 0.00%    
Other | Maximum | Non-U.S. | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Target allocation ranges 10.00%    
Defined Benefit Plan, Funded Plan      
Defined Benefit Plan Disclosure [Line Items]      
Funded status $ (218) (298)  
Defined Benefit Plan, Unfunded Plan      
Defined Benefit Plan Disclosure [Line Items]      
Funded status $ 260 $ 238