v3.25.2
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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 2,690 $ 2,077 $ 2,224 $ 2,029
Net investment gains (losses) included in earnings 3 (1) 4 (5)
Unrealized gains (losses) included in other comprehensive income (loss) 36 (17) 55 (36)
Purchases 251 286 798 506
Issuances 0 0 0 0
Sales 0 0 (1) 0
Settlements (72) (26) (92) (168)
Transfers into Level 3 168 246 183 472
Transfers out of Level 3 0 (352) (95) (585)
Balance, end of period 3,076 2,213 3,076 2,213
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings $ 3 $ (2) $ 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] Other Comprehensive Income (Loss), before Tax 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 $ 1,603 $ 859 $ 1,156 $ 772
Net investment gains (losses) included in earnings 0 1 0 2
Unrealized gains (losses) included in other comprehensive income (loss) 20 (5) 30 (9)
Purchases 175 189 609 307
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (44) (21) (56) (49)
Transfers into Level 3 168 190 183 190
Transfers out of Level 3 0 0 0 0
Balance, end of period 1,922 1,213 1,922 1,213
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings 0 1 0 2
Fixed maturity securities | Public utilities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 756 507 647 253
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 14 (1) 20 (11)
Purchases 48 39 158 99
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (26) (3) (33) (25)
Transfers into Level 3 0 56 0 282
Transfers out of Level 3 0 (233) 0 (233)
Balance, end of period 792 365 792 365
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 | Sovereign and supranational        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 24 28 23 30
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 (1) 2 (3)
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 23 25 23 25
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 10 74 10 78
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) (5) (1) (9)
Purchases 0 0 0 5
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 (5)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 9 69 9 69
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 137 450 231 648
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 2 (5) 4 (4)
Purchases 24 58 24 95
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (1) (3)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (119) (95) (352)
Balance, end of period 163 384 163 384
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 160 159 157 248
Net investment gains (losses) included in earnings 3 (2) 4 (7)
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 4 0 7 0
Issuances 0 0 0 0
Sales 0 0 (1) 0
Settlements 0 0 0 (84)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 167 157 167 157
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings $ 3 $ (3) $ 4 $ (6)