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Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Effective income tax rate	1.10%			2.00%		0.10%
Income tax benefit	$ 57	$ 10	$ 0	$ 10		$ 13
Deferred tax asset, operating loss carryforward, limitations		54		54	$ 54
Cancellation of debt income					5,000
Federal
Business Acquisition [Line Items]
NOL carryforwards, subject to expiration		900		900	900
Federal | Minimum
Business Acquisition [Line Items]
NOL carryforwards		2,500		2,500	2,500
NOL carryforwards, not subject to expiration		1,600		1,600	1,600
Federal | Maximum
Business Acquisition [Line Items]
NOL carryforwards		3,000		3,000	3,000
NOL carryforwards, not subject to expiration		$ 2,100		$ 2,100	$ 2,100

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