v3.26.1
FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Assets:    
Fixed maturity securities, available-for-sale $ 63,228 $ 64,121
Equity securities 851 887
Other investments 2,616 1,373
Cash and cash equivalents 5,654 6,245
Asset derivatives 211 179
Total assets 72,560 72,805
Liabilities:    
Liability derivatives 1,016 972
Total liabilities 1,016 972
Foreign currency swaps    
Assets:    
Asset derivatives 43 45
Liabilities:    
Liability derivatives 806 765
Foreign currency forwards    
Assets:    
Asset derivatives 145 120
Liabilities:    
Liability derivatives 23 18
Foreign currency options    
Assets:    
Asset derivatives 23  
Liabilities:    
Liability derivatives 40  
Interest rate swaps    
Assets:    
Asset derivatives   14
Liabilities:    
Liability derivatives 142 189
Forward bond purchase commitment    
Liabilities:    
Liability derivatives 5  
Government and agencies    
Assets:    
Fixed maturity securities, available-for-sale 13,572 14,607
Municipalities    
Assets:    
Fixed maturity securities, available-for-sale 1,878 1,930
Mortgage- and asset-backed securities    
Assets:    
Fixed maturity securities, available-for-sale 5,037 4,366
Public utilities    
Assets:    
Fixed maturity securities, available-for-sale 6,954 7,174
Sovereign and supranational    
Assets:    
Fixed maturity securities, available-for-sale 385 402
Banks/financial institutions    
Assets:    
Fixed maturity securities, available-for-sale 9,194 9,244
Other corporate    
Assets:    
Fixed maturity securities, available-for-sale 26,208 26,398
Level 1    
Assets:    
Fixed maturity securities, available-for-sale 12,993 13,921
Equity securities 692 727
Other investments 2,616 1,373
Cash and cash equivalents 5,654 6,245
Asset derivatives 0 0
Total assets 21,955 22,266
Liabilities:    
Total liabilities 0 0
Level 1 | Foreign currency swaps    
Assets:    
Asset derivatives 0 0
Liabilities:    
Liability derivatives 0 0
Level 1 | Foreign currency forwards    
Assets:    
Asset derivatives 0 0
Liabilities:    
Liability derivatives 0 0
Level 1 | Foreign currency options    
Assets:    
Asset derivatives 0  
Liabilities:    
Liability derivatives 0  
Level 1 | Interest rate swaps    
Assets:    
Asset derivatives   0
Liabilities:    
Liability derivatives 0 0
Level 1 | Forward bond purchase commitment    
Liabilities:    
Liability derivatives 0  
Level 1 | Government and agencies    
Assets:    
Fixed maturity securities, available-for-sale 12,993 13,921
Level 1 | Municipalities    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 1 | Mortgage- and asset-backed securities    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 1 | Public utilities    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 1 | Sovereign and supranational    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 1 | Banks/financial institutions    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 1 | Other corporate    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 2    
Assets:    
Fixed maturity securities, available-for-sale 46,597 46,843
Equity securities 0 0
Other investments 0 0
Cash and cash equivalents 0 0
Asset derivatives 211 179
Total assets 46,808 47,022
Liabilities:    
Total liabilities 1,016 972
Level 2 | Foreign currency swaps    
Assets:    
Asset derivatives 43 45
Liabilities:    
Liability derivatives 806 765
Level 2 | Foreign currency forwards    
Assets:    
Asset derivatives 145 120
Liabilities:    
Liability derivatives 23 18
Level 2 | Foreign currency options    
Assets:    
Asset derivatives 23  
Liabilities:    
Liability derivatives 40  
Level 2 | Interest rate swaps    
Assets:    
Asset derivatives   14
Liabilities:    
Liability derivatives 142 189
Level 2 | Forward bond purchase commitment    
Liabilities:    
Liability derivatives 5  
Level 2 | Government and agencies    
Assets:    
Fixed maturity securities, available-for-sale 579 686
Level 2 | Municipalities    
Assets:    
Fixed maturity securities, available-for-sale 1,878 1,930
Level 2 | Mortgage- and asset-backed securities    
Assets:    
Fixed maturity securities, available-for-sale 2,382 2,072
Level 2 | Public utilities    
Assets:    
Fixed maturity securities, available-for-sale 6,129 6,298
Level 2 | Sovereign and supranational    
Assets:    
Fixed maturity securities, available-for-sale 366 383
Level 2 | Banks/financial institutions    
Assets:    
Fixed maturity securities, available-for-sale 9,190 9,235
Level 2 | Other corporate    
Assets:    
Fixed maturity securities, available-for-sale 26,073 26,239
Level 3    
Assets:    
Fixed maturity securities, available-for-sale 3,638 3,357
Equity securities 159 160
Other investments 0 0
Cash and cash equivalents 0 0
Asset derivatives 0 0
Total assets 3,797 3,517
Liabilities:    
Total liabilities 0 0
Level 3 | Foreign currency swaps    
Assets:    
Asset derivatives 0 0
Liabilities:    
Liability derivatives 0 0
Level 3 | Foreign currency forwards    
Assets:    
Asset derivatives 0 0
Liabilities:    
Liability derivatives 0 0
Level 3 | Foreign currency options    
Assets:    
Asset derivatives 0  
Liabilities:    
Liability derivatives 0  
Level 3 | Interest rate swaps    
Assets:    
Asset derivatives   0
Liabilities:    
Liability derivatives 0 0
Level 3 | Forward bond purchase commitment    
Liabilities:    
Liability derivatives 0  
Level 3 | Government and agencies    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 3 | Municipalities    
Assets:    
Fixed maturity securities, available-for-sale 0 0
Level 3 | Mortgage- and asset-backed securities    
Assets:    
Fixed maturity securities, available-for-sale 2,655 2,294
Level 3 | Public utilities    
Assets:    
Fixed maturity securities, available-for-sale 825 876
Level 3 | Sovereign and supranational    
Assets:    
Fixed maturity securities, available-for-sale 19 19
Level 3 | Banks/financial institutions    
Assets:    
Fixed maturity securities, available-for-sale 4 9
Level 3 | Other corporate    
Assets:    
Fixed maturity securities, available-for-sale $ 135 $ 159