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Restructuring and Other Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Integration activities charges		$ 56
Employee termination costs		32
Facility exit and related costs		1
Non-cash impairment charges	$ 48	48	$ 3	$ 18
Employee Termination Costs
Restructuring Cost and Reserve [Line Items]
Employee severance and other separation costs accrual	$ 14	14	$ 0
Share-based compensation costs		$ 23