Restructuring - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) position	Dec. 31, 2020 USD ($) position	Dec. 31, 2019 USD ($)
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions | position	30
Initial Charge Recorded	$ 19,000,000
Reductions to restructuring reserve	0
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions | position		830
Restructuring reserve reversed	8,000,000
Initial Charge Recorded	65,000,000	$ 65,000,000
Reductions to restructuring reserve	$ 45,000,000	7,000,000
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve reversed		$ 7,000,000
Initial Charge Recorded			$ 25,000,000