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Reorganization and Business Transformation (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 13	$ 23
Cash payments for restructuring	18	11
Restructuring Reserve [Roll Forward]
Balance at December 31, 2018	12
Expense accruals	7
Cash payments	(18)	(11)
Balance at September 30, 2019	1	12
Accelerated depreciation	6
Employee separation benefits costs related to headquarter transition and business transformation
Restructuring Cost and Reserve [Line Items]
Cash payments for restructuring	14
Restructuring Reserve [Roll Forward]
Balance at December 31, 2018	11
Expense accruals	4
Cash payments	(14)
Balance at September 30, 2019	1	11
Transition support and other exit related costs for the headquarter transition and business transformation
Restructuring Cost and Reserve [Line Items]
Cash payments for restructuring	4
Restructuring Reserve [Roll Forward]
Balance at December 31, 2018	1
Expense accruals	3
Cash payments	(4)
Balance at September 30, 2019	0	$ 1
Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	36
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 40

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