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Post-employment benefits for associates - Additional information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]            
Weighted average duration of defined benefit obligation       11 years 7 months 6 days 15 years 6 months  
Defined contribution plans charges       $ 144 $ 133 $ 136
Provisions and Other Non-current Liabilities            
Disclosure of defined benefit plans [line items]            
Gain (loss) on plan amendment $ (15) $ (164) $ 12      
Other Income            
Disclosure of defined benefit plans [line items]            
Increase (decrease) in DBO $ (15) $ (164)        
Other Expense            
Disclosure of defined benefit plans [line items]            
Increase (decrease) in DBO     $ 12      
Benefit obligation            
Disclosure of defined benefit plans [line items]            
Top four countries, percentage       88.00%    
Pension plans | United Kingdom | Foreign countries            
Disclosure of defined benefit plans [line items]            
Maximum number of years to eliminate shortfall       10 years    
Other post-employment benefit plans | Benefit obligation | United States            
Disclosure of defined benefit plans [line items]            
Associates covered, percentage       99.00%