Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Income tax expense	$ 16	$ 32	$ 1
Domestic tax benefit			10
Operating loss carryforwards	1,543
Operating loss carryforward not subject to expiration	1,405
Deferred tax assets	6	6
Deferred tax liabilities	16	12
Unrecognized tax benefits	7	7	$ 4
Unrecognized tax benefits that would impact effective tax rate	2
Deferred tax liabilities for unremitted foreign earnings	3
Estimated foreign earnings	59
VNBS
Income Tax Contingency [Line Items]
Tax effect of discontinued operation		23
Investments And Other Non Current Assets
Income Tax Contingency [Line Items]
Deferred tax assets	6	6
Other Noncurrent Liabilities
Income Tax Contingency [Line Items]
Deferred tax liabilities	16	$ 12
Research and Development Tax Credit Carryforward
Income Tax Contingency [Line Items]
Tax credit carryforwards	$ 14