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Trade receivables (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of provision matrix [line items]      
Utilization of reversal of provisions for doubtful trade receivables $ 19,294 $ 19,348 $ 18,567
Trade receivables [member] | Provision for doubtful receivable [member]      
Disclosure of provision matrix [line items]      
Provision for doubtful receivable at beginning of period (95) (126) (190)
Impact of business combinations     (1)
Provisions for doubtful trade receivables charged to the consolidated income statement (59) (89) (47)
Utilization of reversal of provisions for doubtful trade receivables 13 12 39
Reversal of provisions for doubtful trade receivables 53 53 61
Currency translation effects (5) 1 12
Provision for doubtful receivable at end of period $ (93) (95) (126)
Continuing operations [member] | Trade receivables [member] | Provision for doubtful receivable [member]      
Disclosure of provision matrix [line items]      
Provisions for doubtful trade receivables charged to the consolidated income statement   (89) (30)
Reversal of provisions for doubtful trade receivables   53 44
Discontinued operations [member] | Trade receivables [member] | Provision for doubtful receivable [member]      
Disclosure of provision matrix [line items]      
Provision for doubtful receivable at beginning of period   $ 54  
Provision for doubtful receivable at end of period     $ 54