Reorganization and Business Transformation - Costs Incurred For Reorganization Plan (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	$ 18
Expense accruals	9
Cash payments	(27)
Restructuring reserve. ending balance	0
VSP
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	16
Expense accruals	2
Cash payments	(18)
Restructuring reserve. ending balance	0
Workforce Reduction Plan | Employee severance and other employee-related costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	2
Expense accruals	3
Cash payments	(5)
Restructuring reserve. ending balance	0
Workforce Reduction Plan | Facilities lease related costs, outside service, legal and other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve. beginning balance	0
Expense accruals	4
Cash payments	(4)
Restructuring reserve. ending balance	$ 0