Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Provisions	$ 43	$ 42
Costs capitalized for tax	0	1
Intangibles assets	7	12
Tax receivables, principally net operating loss carryforward	262	130
Lease liabilities	29	29
Credits	14	8
Other	6	4
Deferred tax assets before allowances	361	226
Valuation allowances	(323)	(179)
Total	38	47
Liabilities
Property, plant and equipment	(5)	(9)
Distribution taxes	(2)	(4)
Convertible Senior Notes	(8)	(10)
Operating lease right-of-use assets	(29)	(30)
Total	(44)	(53)
Net deferred tax liability	$ (6)	$ (6)