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Post-employment benefits for associates - Breakdown of DBO for pension plans by geography and type of member (Details) - Pension plans - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value $ (563) $ (791)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus (29) (45)
Fair value of plan assets 417 541
Funded status (146) (250)
Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (356) (501)
Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (94) (151)
Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (113) (139)
Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (78) (99)
Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (97) (196)
Country of domicile | Switzerland    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (236) (329)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus 0 0
Fair value of plan assets 175 195
Funded status (61) (134)
Country of domicile | Switzerland | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (207) (295)
Country of domicile | Switzerland | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (6) (11)
Country of domicile | Switzerland | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (23) (23)
Country of domicile | Switzerland | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (35) (47)
Country of domicile | Switzerland | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (26) (87)
Foreign countries | United States    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (95) (126)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus 0 0
Fair value of plan assets 64 91
Funded status (31) (35)
Foreign countries | United States | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (32) (43)
Foreign countries | United States | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (28) (41)
Foreign countries | United States | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (35) (42)
Foreign countries | United States | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (24) (29)
Foreign countries | United States | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (7) (6)
Foreign countries | Germany    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (77) (115)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus 0 0
Fair value of plan assets 17 21
Funded status (60) (94)
Foreign countries | Germany | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (38) (64)
Foreign countries | Germany | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (18) (28)
Foreign countries | Germany | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (21) (23)
Foreign countries | Germany | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value 0 0
Foreign countries | Germany | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (60) (94)
Foreign countries | United Kingdom    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (58) (97)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus (6) (24)
Fair value of plan assets 64 121
Funded status 6 24
Foreign countries | United Kingdom | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value 0 0
Foreign countries | United Kingdom | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (33) (57)
Foreign countries | United Kingdom | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (25) (40)
Foreign countries | United Kingdom | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value 0 0
Foreign countries | United Kingdom | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value 0 0
Foreign countries | Rest of the world    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (97) (124)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus (23) (21)
Fair value of plan assets 97 113
Funded status 0 (11)
Foreign countries | Rest of the world | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (79) (99)
Foreign countries | Rest of the world | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (9) (14)
Foreign countries | Rest of the world | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (9) (11)
Foreign countries | Rest of the world | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (19) (23)
Foreign countries | Rest of the world | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value $ (4) $ (9)