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Post-employment benefits for associates (Details 4) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value $ 25,602 $ 23,066 $ 22,179
Plan assets, at fair value 22,317 19,810 18,838
Funded status 3,285 3,256  
Pension plans | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,217 1,136  
Pension plans | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 9,075 8,197  
Pension plans | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 3,109 2,722  
Pension plans | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 13,418 12,147  
Pension plans | Switzerland      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 16,807 15,106  
Plan assets, at fair value 16,396 14,457  
Funded status (411) (649)  
Pension plans | Switzerland | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 6,837 6,167  
Pension plans | Switzerland | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 9,970 8,939  
Pension plans | US      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 3,788 3,552  
Plan assets, at fair value 2,487 2,311  
Funded status (1,301) (1,241)  
Pension plans | US | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 701 670  
Pension plans | US | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 665 630  
Pension plans | US | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,290 1,205  
Pension plans | US | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,833 1,717  
Pension plans | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 5,007 4,408  
Plan assets, at fair value 3,434 3,042  
Funded status (1,573) (1,366)  
Pension plans | Rest of the world | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 516 466  
Pension plans | Rest of the world | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,573 1,400  
Pension plans | Rest of the world | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,819 1,517  
Pension plans | Rest of the world | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 1,615 1,491  
Other post-employment benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 632 746 1,073
Plan assets, at fair value 89 134 $ 119
Funded status 543 612  
Other post-employment benefit plans | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 543 612  
Other post-employment benefit plans | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 105 157  
Other post-employment benefit plans | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 17 15  
Other post-employment benefit plans | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 510 574  
Other post-employment benefit plans | US      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 543 658  
Plan assets, at fair value 89 134  
Funded status (454) (524)  
Other post-employment benefit plans | US | Unfunded      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 454 524  
Other post-employment benefit plans | US | Active      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 80 121  
Other post-employment benefit plans | US | Deferred pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 17 15  
Other post-employment benefit plans | US | Pensioners      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 446 522  
Other post-employment benefit plans | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Defined benefit obligation, at present value 89 88  
Plan assets, at fair value 0 0  
Funded status (89) (88)  
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 89 88  
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 25 36  
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 $ 64 $ 52