Restructuring and other (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 16	$ 6	$ 38	$ 13
Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other	12	2	30	5
Contingent Consideration Adjustment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other	0	2	0	2
Restructuring, integration and other
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 4	$ 2	$ 8	$ 6