v3.26.1
SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net investment gains (losses) $ 49 $ (963)
Acquisition and operating expenses (1,289) (1,308)
Income tax (expense) or benefit (206) (116)
Net of tax $ 1,019 $ 29
U.S. federal statutory income tax rate 21.00% 21.00%
Reclassification Out Of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net of tax $ (8) $ 32
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized gains (losses) on available-for-sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net investment gains (losses) (14) 40
Income tax (expense) or benefit [1] 3 (8)
Net of tax (11) 32
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net investment gains (losses) 4 (1)
Income tax (expense) or benefit [1] (1) 0
Net of tax 3 (1)
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment, actuarial gains (losses)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Acquisition and operating expenses [2] 0 1
Reclassification Out Of Accumulated Other Comprehensive Income | Pension liability adjustment, prior service (cost) credit    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Acquisition and operating expenses [2] 0 0
Reclassification Out Of Accumulated Other Comprehensive Income | Pension Liability Adjustment    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income tax (expense) or benefit [1] 0 0
Net of tax $ 0 $ 1
[1] Based on 21% tax rate
[2] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost (see Note 12 for additional details).