Reorganization and Business Transformation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Expense accruals	$ 8,000,000
Restructuring costs	14,000,000	$ 23,000,000
Restructuring costs incurred	37,000,000
Payments for restructuring	19,000,000	11,000,000
Accelerated depreciation	6,000,000
Employee separation benefits costs related to headquarter transition and business transformation
Restructuring Cost and Reserve [Line Items]
Expense accruals	5,000,000
Payments for restructuring	15,000,000
2015 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expense accruals	$ 0	$ 0	$ 26,000,000