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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, 2019
Dec. 31, 2018
Pension plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - January 1 $ 242 $ 232
Current service cost 22 28
Interest cost (income) 5 6
Past service costs and settlements 2 1
Administrative expenses 1 1
Currency translation effects (6) (6)
Employer contributions 21 19
Effect of acquisitions, divestments or transfers (5) 2
Net defined benefit liability (asset) - December 31 278 242
Funded status (272) (238)
Limitation on recognition of fund surplus at January 1 (4) (6)
Change in limitation on recognition of fund surplus (including exchange rate differences) (2) 2
Limitation on recognition of fund surplus at December 31 (6) (4)
Pension plans [member] | Benefit obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - January 1 662 671
Current service cost 22 28
Interest cost (income) 13 15
Past service costs and settlements 2 0
Administrative expenses 1 1
Remeasurement losses/(gains) arising from changes in financial assumptions 71 (17)
Remeasurement losses/(gains) arising from changes in demographic assumptions 6 1
Experience-related remeasurement (gains)/losses (5) 2
Currency translation effects 1 (15)
Benefit payments 15 29
Contributions of associates (5) (4)
Effect of acquisitions, divestments or transfers (40) 1
Net defined benefit liability (asset) - December 31 723 662
Pension plans [member] | Plan assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - January 1 (424) (445)
Interest cost (income) (8) (9)
Return on plan assets excluding interest income 36 (13)
Currency translation effects (7) 9
Benefit payments (15) (29)
Employer contributions 21 19
Contributions of associates 5 4
Settlements 0 (1)
Effect of acquisitions, divestments or transfers 35 1
Net defined benefit liability (asset) - December 31 (451) (424)
Other post-employment benefit plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - January 1 345 317
Current service cost 8 11
Interest cost (income) 14 11
Past service costs and settlements 0 0
Administrative expenses 0 0
Currency translation effects 0 0
Employer contributions (28) (11)
Effect of acquisitions, divestments or transfers 0 0
Net defined benefit liability (asset) - December 31 423 345
Funded status (423) (345)
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 1 385 382
Current service cost 8 11
Interest cost (income) 15 13
Past service costs and settlements 0 0
Administrative expenses 0 0
Remeasurement losses/(gains) arising from changes in financial assumptions 52 (3)
Remeasurement losses/(gains) arising from changes in demographic assumptions (1) 6
Experience-related remeasurement (gains)/losses (20) (11)
Currency translation effects 0 0
Benefit payments 16 13
Contributions of associates 0 0
Effect of acquisitions, divestments or transfers 0 0
Net defined benefit liability (asset) - December 31 423 385
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 (40) (65)
Interest cost (income) (1) (2)
Return on plan assets excluding interest income 3 (3)
Currency translation effects 0 0
Benefit payments (16) (13)
Employer contributions (28) (11)
Contributions of associates 0 0
Settlements 0 0
Effect of acquisitions, divestments or transfers 0 0
Net defined benefit liability (asset) - December 31 $ 0 $ (40)