Income Taxes - Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
(Loss) income from continuing operations before income taxes	$ (20)	$ (165)	$ 186
Expected tax (benefit) expense at U.K. statutory rate of 19%, 19% and 20%, respectively	(4)	(31)	35
Non-U.K. tax rate differentials	(4)	(7)	(1)
Other non-U.K. tax effects, including nondeductible expenses, tax effect of rate changes and transfer pricing adjustments	0	(5)	0
Unrealized currency exchange gains and losses	0	0	7
Tax authority audits and dispute resolutions	0	0	1
Change in valuation allowance	158	39	3
Effects of U.S. tax reform	0	0	3
Other, net	0	(4)	2
Total income tax expense (benefit)	$ 150	$ (8)	$ 50