v3.26.1
FAIR VALUE MEASUREMENTS - Changes in Investments Carried at Fair Value Classified as Level 3 (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 3,797 $ 2,690 $ 3,517 $ 2,224
Net investment gains (losses) included in earnings 12 3 22 4
Unrealized gains (losses) included in other comprehensive income (loss) (17) 36 (80) 55
Purchases 228 251 541 798
Issuances 0 0 0 0
Sales 0 0 0 (1)
Settlements (155) (72) (249) (92)
Transfers into Level 3 140 168 259 183
Transfers out of Level 3 (86) 0 (91) (95)
Balance, end of period 3,919 3,076 3,919 3,076
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings $ 4 $ 3 $ 4 $ 4
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment gains (losses) Net investment gains (losses) Net investment gains (losses) Net investment gains (losses)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), before Tax
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net investment gains (losses), Other Comprehensive Income (Loss), before Tax Net investment gains (losses), Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), before Tax
Fixed maturity securities | Mortgage- and asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 2,655 $ 1,603 $ 2,294 $ 1,156
Net investment gains (losses) included in earnings 12 0 14 0
Unrealized gains (losses) included in other comprehensive income (loss) (16) 20 (48) 30
Purchases 189 175 491 609
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (141) (44) (171) (56)
Transfers into Level 3 140 168 259 183
Transfers out of Level 3 (86) 0 (86) 0
Balance, end of period 2,753 1,922 2,753 1,922
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings 1 0 2 0
Fixed maturity securities | Public utilities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 825 756 876 647
Net investment gains (losses) included in earnings 1 0 5 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 14 (24) 20
Purchases 39 48 49 158
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (12) (26) (54) (33)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 852 792 852 792
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings 1 0 1 0
Fixed maturity securities | Sovereign and supranational        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 19 24 19 23
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 1 0 2
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) (2) (2) (2)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 17 23 17 23
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings 0 0 0 0
Fixed maturity securities | Banks/financial institutions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 4 10 9 10
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 (1) 0 (1)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 (5) 0
Balance, end of period 4 9 4 9
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings 0 0 0 0
Fixed maturity securities | Other corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 135 137 159 231
Net investment gains (losses) included in earnings 0 0 6 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 2 (8) 4
Purchases 0 24 0 24
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (22) (1)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 (95)
Balance, end of period 135 163 135 163
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings 0 0 0 0
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 159 160 160 157
Net investment gains (losses) included in earnings (1) 3 (3) 4
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 0 4 1 7
Issuances 0 0 0 0
Sales 0 0 0 (1)
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 158 167 158 167
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings $ 2 $ 3 $ 1 $ 4