Restructuring - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) position	Dec. 31, 2019 USD ($)
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | position	70
Restructuring charges paid	$ 9
Increase (decrease) in restructuring reserve	(2)
Restructuring reserve balance	$ 7
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction | position	300
Restructuring charges paid	$ 7
Restructuring reserve balance	$ 11	$ 18