v3.26.1
Accumulated Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net unrealized gain (loss) $ (283) $ (1,343)
Income tax expense (benefit) (20) (1)
Reclassifications, net of income taxes 420 18
Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income tax expense (benefit) 0 2
Reclassifications, net of income taxes (6) 7
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gain (loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net unrealized gain (loss) (6) 9
Reclassification out of Accumulated Other Comprehensive Income | Net realized gain (loss) on investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net unrealized gain (loss) 18 24
Reclassification out of Accumulated Other Comprehensive Income | Other impaired securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net unrealized gain (loss) $ (24) $ (15)