Leases (Narrative) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Line Items]
Option to terminate leases, Lessee			1 year
Option to terminate leases, Lessor			1 year
Minimum [Member]
Leases [Line Items]
Operating and finance lease terms, Lessee			1 year
Operator lease terms, Lessor		1 year	1 year
Maximum [Member]
Leases [Line Items]
Operating and finance lease terms, Lessee			87 years
Operator lease terms, Lessor		65 years	65 years
Successor [Member]
Leases [Line Items]
Retained earnings (deficit)		$ 414	$ 414
Lease revenue		$ 42
Predecessor [Member]
Leases [Line Items]
Retained earnings (deficit)				$ (8,975)
Lease revenue	$ 21			$ 67	$ 70
Predecessor [Member] | Accounting Standards Update 2016-02 [Member]
Leases [Line Items]
Retained earnings (deficit)						$ 15
Unamortized deferred gain, net						$ 11