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FAIR VALUE MEASUREMENTS - Changes in Investments Carried at Fair Value Classified as Level 3 (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 3,076 $ 2,213 $ 2,224 $ 2,029
Net investment gains (losses) included in earnings (4) 3 0 (2)
Unrealized gains (losses) included in other comprehensive income (loss) 14 99 69 63
Purchases 218 184 1,016 690
Issuances 0 0 0 0
Sales (1) (1) (2) (1)
Settlements (69) (24) (161) (192)
Transfers into Level 3 175 159 358 631
Transfers out of Level 3 0 (281) (95) (866)
Balance, end of period 3,409 2,352 3,409 2,352
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings $ 0 $ 7 $ 4 $ 3
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 $ 1,922 $ 1,213 $ 1,156 $ 772
Net investment gains (losses) included in earnings 0 1 0 3
Unrealized gains (losses) included in other comprehensive income (loss) 6 57 36 48
Purchases 208 31 817 338
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (65) (18) (121) (67)
Transfers into Level 3 175 15 358 205
Transfers out of Level 3 0 (90) 0 (90)
Balance, end of period 2,246 1,209 2,246 1,209
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 3
Fixed maturity securities | Public utilities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 792 365 647 253
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 9 19 29 8
Purchases 9 48 167 147
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (4) (1) (37) (26)
Transfers into Level 3 0 139 0 421
Transfers out of Level 3 0 0 0 (233)
Balance, end of period 806 570 806 570
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 23 25 23 30
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 3 1 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (2) (2)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 22 28 22 28
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 9 69 10 78
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 (1) (9)
Purchases 0 4 0 9
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 (4) 0 (9)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (59) 0 (59)
Balance, end of period 9 10 9 10
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 163 384 231 648
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 20 4 16
Purchases 0 98 24 193
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 (1) (1) (4)
Transfers into Level 3 0 5 0 5
Transfers out of Level 3 0 (132) (95) (484)
Balance, end of period 163 374 163 374
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 167 157 157 248
Net investment gains (losses) included in earnings (4) 2 0 (5)
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 1 3 8 3
Issuances 0 0 0 0
Sales (1) (1) (2) (1)
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 163 161 163 161
Changes in unrealized gains (losses) relating to Level 3 assets and liabilities still held at the end of the period included in earnings $ 0 $ 6 $ 4 $ 0