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Leases - Supplementary Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating lease cost
Operating lease cost	$ 5	$ 4
Short-term lease cost	0	0
Total Lease cost	5	4
Lease, Other Information [Abstract]
Cash paid for amounts included in the measurement of lease liabilities - Operating Cash flows	5	4
Right-of-use assets obtained in exchange for operating lease liabilities during the period	$ 0	$ 0
Weighted-average remaining lease term in months	12 months	28 months
Weighted-average discount rate	29.00%	13.00%

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- Definition

Lease, Other Information [Abstract]

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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