Income Taxes (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
Income Tax Contingency [Line Items]
Expected income refunds		$ 13	$ 13
Gross tax liability for tax positions that may not be sustained under a more likely than not threshold		1	1
Effect of expiration of statute of limitations during next twelve months		0	$ 0
Deferred income tax payment period			2 years
Percentage of limitation on use			80.00%
Research Tax Credit Carryforward [Member]
Income Tax Contingency [Line Items]
Tax credit expiration year			2041
Research and development credits			$ 1
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Operating loss carryforward		312	312
Internal Revenue Service (IRS) [Member] | Indefinite Tax Period [Member]
Income Tax Contingency [Line Items]
Operating loss carryforward		18	$ 18
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax credit expiration year			2026
Various tax credits		3	$ 3
State and Local Jurisdiction [Member] | State Net Operating Loss Carryforward [Member]
Income Tax Contingency [Line Items]
Operating loss carryforward		$ 1,800	$ 1,800
Tax credit expiration year			2041
Minimum [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Tax credit expiration year			2036
Maximum [Member] | Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Tax credit expiration year			2038
Successor [Member]
Income Tax Contingency [Line Items]
Federal rate		21.00%
Income taxes paid		$ 28
Valuation allowance		92	$ 92
Deferred income tax payment		30	30
Deferred payments related to social security taxes		$ 30	$ 30
Predecessor [Member]
Income Tax Contingency [Line Items]
Federal rate	21.00%			21.00%	21.00%
Income taxes paid	$ 9			$ 8	$ 4
Valuation allowance				$ 783