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Supplemental financial information - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 0	$ 24	$ (36)
Treasury shares issued related to stock compensation (in shares)	2,160,645		8,943,825
Severance and benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 24
Restructuring payments			$ 1