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Accrued liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Sales deductions $ 3,170 $ 2,247
Employee compensation and benefits 1,001 816
Dividends payable 914 953
Sales returns reserve 535 455
Other 2,242 2,045
Total accrued liabilities $ 7,862 $ 6,516