Income Taxes - Effective Income Tax Expense (Benefit) Table (Details) - USD ($) $ in Millions		1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 09, 2021	Feb. 09, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense (benefit) at the federal statutory rate of 21%		$ 1,119	$ 188	$ 655	$ 767
State income taxes (net of federal income tax benefit)		238	(86)	56	75
Change in valuation allowance due to Acquisitions		0	(49)	0	19
Change in valuation allowance excluding impact of Acquisitions		(1,191)	(179)	(33)	(2,147)
Reorganization items		(173)	60	0	0
Transaction costs		0	11	0	2
Removal of stranded tax effects in accumulated other comprehensive income		(57)	0	0	0
Other		7	6	20	(1)
Total	$ (57)	$ (57)	$ (49)	$ 698	$ (1,285)