Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	0.00%	0.00%
Unrecognized tax benefits	$ 46,000,000	$ 0
Interest and penalties related to unrecognized tax benefits	0	0
Accrued interest and penalties associated with income taxes	0	0
Federal net operating loss carryover subject to limitations	0
Alternative minimum tax credits	0
Valuation allowance on deferred tax assets	$ (1,064,000,000)	$ (857,000,000)