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Provisions and other non-current liabilities - Provisions and other non-current liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accrued liability for employee benefits:    
Defined benefit pension plans $ 291 $ 254
Other long-term employee benefits and deferred compensation 140 104
Other post-employment benefits 423 345
Provisions for product liabilities, governmental investigations and other legal matters 0 0
Contingent consideration 208 143
Other non-current liabilities 106 67
Total provisions and other non-current liabilities $ 1,168 $ 913