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Post-employment benefits for employees (Details 3) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value $ 17,533 $ 23,583 $ 25,602
Plan assets, at fair value 18,945 22,420 22,317
Funded status 1,412 (1,163)  
Pension plans | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 919 1,127  
Pension plans | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 6,161 8,510  
Pension plans | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,691 2,938  
Pension plans | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 9,681 12,135  
Pension plans | Switzerland      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 11,824 15,268  
Plan assets, at fair value 14,701 16,436  
Funded status 2,877 1,168  
Pension plans | Switzerland | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 4,799 6,478  
Pension plans | Switzerland | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 7,025 8,790  
Pension plans | US      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 2,746 3,645  
Plan assets, at fair value 1,978 2,551  
Funded status (768) (1,094)  
Pension plans | US | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 556 688  
Pension plans | US | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 431 620  
Pension plans | US | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 830 1,208  
Pension plans | US | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,485 1,817  
Pension plans | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 2,963 4,670  
Plan assets, at fair value 2,266 3,433  
Funded status (697) (1,237)  
Pension plans | Rest of the world | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 363 439  
Pension plans | Rest of the world | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 931 1,412  
Pension plans | Rest of the world | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 861 1,730  
Pension plans | Rest of the world | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,171 1,528  
Other post-employment benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 422 560 632
Plan assets, at fair value 60 73 $ 89
Funded status (362) (487)  
Other post-employment benefit plans | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 362 487  
Other post-employment benefit plans | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 48 83  
Other post-employment benefit plans | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 8 13  
Other post-employment benefit plans | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 366 464  
Other post-employment benefit plans | US      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 346 473  
Plan assets, at fair value 60 73  
Funded status (286) (400)  
Other post-employment benefit plans | US | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 286 400  
Other post-employment benefit plans | US | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 30 60  
Other post-employment benefit plans | US | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 8 13  
Other post-employment benefit plans | US | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 308 400  
Other post-employment benefit plans | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 76 87  
Plan assets, at fair value 0 0  
Funded status (76) (87)  
Other post-employment benefit plans | Rest of the world | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 76 87  
Other post-employment benefit plans | Rest of the world | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 18 23  
Other post-employment benefit plans | Rest of the world | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 0 0  
Other post-employment benefit plans | Rest of the world | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value $ 58 $ 64