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Provisions and other non-current liabilities - Provisions and other non-current liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accrued liability for employee benefits:    
Defined benefit pension plans $ 339 $ 291
Other long-term employee benefits and deferred compensation 152 140
Other post-employment benefits 332 423
Provisions for litigation and other legal matters 0 0
Contingent consideration 142 208
Other non-current liabilities 95 106
Total provisions and other non-current liabilities $ 1,060 $ 1,168