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Post-employment benefits for associates - Summary of funded and unfunded DBO and net liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]      
Past service costs and settlements $ 154 $ (2) $ (1)
Pension plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - January 1 278 242  
Current service cost 31 22  
Interest cost (income) 5 5  
Past service costs and settlements 11 2  
Administrative expenses 1 1  
Currency translation effects 20 (6)  
Employer contributions 25 21  
Effect of acquisitions, divestments or transfers (12) (5)  
Net defined benefit liability (asset) - December 31 315 278 242
Funded status (298) (272)  
Limitation on recognition of fund surplus at January 1 (6) (4)  
Change in limitation on recognition of fund surplus (including exchange rate differences) (11) (2)  
Limitation on recognition of fund surplus at December 31 (17) (6) (4)
Pension plans [member] | Benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - January 1 723 662  
Current service cost 31 22  
Interest cost (income) 12 13  
Past service costs and settlements 9 2  
Administrative expenses 1 1  
Remeasurement losses arising from changes in financial assumptions 38 71  
Remeasurement losses/(gains) arising from changes in demographic assumptions 2 6  
Remeasurement (gains) arising from experience-related changes (13) (5)  
Currency translation effects 44 1  
Benefit payments 36 15  
Contributions of associates (6) (5)  
Effect of acquisitions, divestments or transfers 0 (40)  
Net defined benefit liability (asset) - December 31 817 723 662
Pension plans [member] | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - January 1 (451) (424)  
Interest cost (income) (7) (8)  
Return on plan assets excluding interest income 32 36  
Currency translation effects (24) (7)  
Benefit payments (36) (15)  
Employer contributions 25 21  
Contributions of associates 6 5  
Settlements (2) 0  
Effect of acquisitions, divestments or transfers (12) 35  
Net defined benefit liability (asset) - December 31 (519) (451) (424)
Other post-employment benefit plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - January 1 423 345  
Current service cost 14 8  
Interest cost (income) 15 14  
Past service costs and settlements (165) 0  
Administrative expenses 0 0  
Currency translation effects 0 0  
Employer contributions 16 (28)  
Effect of acquisitions, divestments or transfers 0 0  
Net defined benefit liability (asset) - December 31 332 423 345
Funded status (332) (423)  
Change in limitation on recognition of fund surplus (including exchange rate differences) 0 0  
Other post-employment benefit plans [member] | Benefit obligation [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - January 1 423 385  
Current service cost 14 8  
Interest cost (income) 15 15  
Past service costs and settlements (165) 0  
Administrative expenses 0 0  
Remeasurement losses arising from changes in financial assumptions 92 52  
Remeasurement losses/(gains) arising from changes in demographic assumptions (4) (1)  
Remeasurement (gains) arising from experience-related changes (27) (20)  
Currency translation effects 0 0  
Benefit payments 25 16  
Contributions of associates (9) 0  
Effect of acquisitions, divestments or transfers 0 0  
Net defined benefit liability (asset) - December 31 332 423 385
Other post-employment benefit plans [member] | Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) - January 1 0 (40)  
Interest cost (income) 0 (1)  
Return on plan assets excluding interest income 0 3  
Currency translation effects 0 0  
Benefit payments (25) (16)  
Employer contributions 16 (28)  
Contributions of associates 9 0  
Settlements 0 0  
Effect of acquisitions, divestments or transfers 0 0  
Net defined benefit liability (asset) - December 31 $ 0 $ 0 $ (40)