Segment Reporting - Reconciliation Of Operating Profit Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting [Abstract]
Income (Loss) before Income Taxes	$ (51)	$ (338)
Reconciling items:
Amortization of Intangible Assets	60	62
Restructuring and related costs	7	16
Interest expense	17	20
Goodwill, Impairment Loss	0	284
(Gain) loss on divestitures and transaction costs	4	14
Litigation costs (recoveries), net	6	12
Other (income) expenses, net	2	(1)
Segment Pre-tax Income (Loss)	45	69
Depreciation and Amortization, excluding Amortization of Acquired Intangible Assets	58	54
Other Nonrecurring (Income) Expense	(7)	0
Segment Adjusted EBITDA	$ 96	$ 123