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Net income per common share - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]      
Initial shares received as part of an accelerated share repurchase program   3,500,000  
Accelerated share repurchases settlement receipt   $ 250  
Forward contracts      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,189,974   1,184,666