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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, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value $ (592) $ (638)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus (36) (31)
Fair value of plan assets 430 448
Funded status (162) (190)
Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (84) (88)
Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (114) (133)
Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (368) (399)
Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (93) (104)
Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (131) (135)
Country of domicile | Switzerland    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (267) (282)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus 0 0
Fair value of plan assets 181 191
Funded status (86) (91)
Country of domicile | Switzerland | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (43) (49)
Country of domicile | Switzerland | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (43) (42)
Country of domicile | Switzerland | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (226) (241)
Country of domicile | Switzerland | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (8) (8)
Country of domicile | Switzerland | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (33) (33)
Foreign countries | United States    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (92) (99)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus 0 0
Fair value of plan assets 70 74
Funded status (22) (25)
Foreign countries | United States | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (21) (22)
Foreign countries | United States | Unfunded portion of funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (1) (3)
Foreign countries | United States | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (25) (31)
Foreign countries | United States | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (29) (31)
Foreign countries | United States | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (38) (37)
Foreign countries | Germany    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (84) (93)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus 0 0
Fair value of plan assets 21 19
Funded status (63) (74)
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 (63) (74)
Foreign countries | Germany | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (42) (47)
Foreign countries | Germany | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (16) (19)
Foreign countries | Germany | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (26) (27)
Foreign countries | United Kingdom    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (53) (62)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus (4) (5)
Fair value of plan assets 57 67
Funded status 4 5
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 | 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 (26) (31)
Foreign countries | United Kingdom | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (27) (31)
Foreign countries | Rest of the world    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (96) (102)
Prepaid benefit costs and assets subject to limitation on recognition of fund surplus (32) (26)
Fair value of plan assets 101 97
Funded status 5 (5)
Foreign countries | Rest of the world | Unfunded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (20) (17)
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 (7) (14)
Foreign countries | Rest of the world | Active    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (75) (80)
Foreign countries | Rest of the world | Deferred pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value (14) (15)
Foreign countries | Rest of the world | Pensioners    
Disclosure of net defined benefit liability (asset) [line items]    
Defined benefit obligation, at present value $ (7) $ (7)