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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2023
Income Taxes [Line Items]      
Effective tax rate 1.00% 0.00%  
Deferred income tax expense (benefit), tax provision recorded, before offset of release of valuation allowance $ 451    
Tax benefit attributable to release of valuation allowance 439    
Valuation allowance related to operating loss 66    
Federal      
Income Taxes [Line Items]      
Operating loss carryforwards subject to a section 382 limitation 2,000    
Operating loss carryforwards 4,000    
Deferred tax assets, operating loss carryforwards, subject to expiration 3,000    
Deferred tax assets, operating loss carryforwards, not subject to expiration 1,000    
Indigo Merger      
Income Taxes [Line Items]      
Operating loss carryforwards subject to a section 382 limitation $ 48    
Forecast      
Income Taxes [Line Items]      
Decrease in valuation allowance     $ 523