Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Net operating loss carryforwards	$ 519	$ 313
Pension and other employee compensation	53	48
Property, plant and equipment	34	28
Other, net	77	49
Total	683	438
Total deferred income tax liabilities:
Property, plant and equipment	(35)	(32)
Pension and other employee compensation	(13)	(4)
Lease liability	(13)	0
Other, net	(4)	(4)
Total	(65)	(40)
Net deferred tax assets before valuation allowance	618	398
Valuation allowance	(585)	(220)
Net deferred tax assets	33	178
Non-current deferred tax assets	33	178
Non-current deferred tax liabilities	0	0
Net deferred tax assets	$ 33	$ 178