Leases Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessor, Operating Lease, Term of Contract	9 years
Operating Leases, Future Minimum Payments Receivable, Remainder of Fiscal Year	$ 1
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	5
Lessee, Operating Lease, Liability, Payments, Due Year Two	5
Lessee, Operating Lease, Liability, Payments, Due Year Three	5
Lessee, Operating Lease, Liability, Payments, Due Year Four	5
Lessee, Operating Lease, Liability, Payments, Due Year Five	5
Lessee, Operating Lease, Liability, Payments, Due after Year Five	18
Lessee, Operating Lease, Liability, Payments, Due	41
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(11)
Operating Lease, Right-of-Use Asset	25	$ 25	$ 14
Operating Lease, Payments	4	6
Operating Lease, Expense	4	7
Variable Lease, Cost	0	0
Sublease Income	(1)	(1)
Lease, Cost	4	7
Operating Lease, Liability	$ 30	$ 29
Operating Lease, Weighted Average Remaining Lease Term	8 years 8 months 12 days	9 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	7.70%	7.90%
Operating Leases, Future Minimum Payments Receivable, in Two Years	$ 1
Operating Leases, Future Minimum Payments Receivable, in Three Years	1
Operating Leases, Future Minimum Payments Receivable, in Four Years	1
Operating Leases, Future Minimum Payments Receivable, in Five Years	1
Operating Leases, Future Minimum Payments, Due Thereafter	5
Lessor, Operating Lease, Payments to be Received	11
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	$ 30
Minimum [Member]
Lessee Operating Lease Remaining Lease Term	1 year
Maximum [Member]
Lessee Operating Lease Remaining Lease Term	9 years