Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2023
Income Taxes [Line Items]
Effective tax rate	(2.00%)	0.00%
Deferred income tax expense (benefit), tax provision recorded, before offset of release of valuation allowance		$ 504
Tax benefit attributable to release of valuation allowance		497
Valuation allowance related to operating loss	$ 66	66
Federal
Income Taxes [Line Items]
Operating loss carryforwards subject to a section 382 limitation	2,000	2,000
Operating loss carryforwards	4,000	4,000
Deferred tax assets, operating loss carryforwards, subject to expiration	3,000	3,000
Deferred tax assets, operating loss carryforwards, not subject to expiration	1,000	1,000
Indigo Merger
Income Taxes [Line Items]
Operating loss carryforwards subject to a section 382 limitation	$ 48	$ 48
Forecast
Income Taxes [Line Items]
Decrease in valuation allowance			$ 523