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Amortized Cost or Cost, Gross Unrealized Gains (Losses) and Fair Value of Fixed Maturity and Equity Securities Classified as Available-for-Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities $ 48,998 $ 49,365      
Gross unrealized gains, fixed maturity securities 517 986      
Gross unrealized losses, fixed maturity securities (4,282) (3,563)      
Allowance for credit losses 0 (7) $ (4) $ (15) $ 0
Fair value, fixed maturity securities $ 45,233 $ 46,781      
Investment, Type [Extensible Enumeration] Fixed Maturities [Member] Fixed Maturities [Member] Fixed Maturities [Member]    
U.S. government, agencies and government-sponsored enterprises          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities $ 3,777 $ 3,588      
Gross unrealized gains, fixed maturity securities 38 121      
Gross unrealized losses, fixed maturity securities (303) (215)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 3,512 3,494      
State and Political Subdivisions          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 2,453 2,537      
Gross unrealized gains, fixed maturity securities 10 24      
Gross unrealized losses, fixed maturity securities (295) (259)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 2,168 2,302      
Non-U.S. government          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 804 703      
Gross unrealized gains, fixed maturity securities 8 15      
Gross unrealized losses, fixed maturity securities (103) (92)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 709 626      
U.S. corporate          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 28,995 29,360      
Gross unrealized gains, fixed maturity securities 352 649      
Gross unrealized losses, fixed maturity securities (2,534) (2,024)      
Allowance for credit losses 0 0 $ 0 (9) 0
Fair value, fixed maturity securities 26,813 27,985      
U.S. corporate | Utilities          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 4,639 4,521      
Gross unrealized gains, fixed maturity securities 47 104      
Gross unrealized losses, fixed maturity securities (454) (352)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 4,232 4,273      
U.S. corporate | Energy          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 2,448 2,449      
Gross unrealized gains, fixed maturity securities 43 66      
Gross unrealized losses, fixed maturity securities (169) (143)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 2,322 2,372      
U.S. corporate | Finance and insurance          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 7,703 7,813      
Gross unrealized gains, fixed maturity securities 55 99      
Gross unrealized losses, fixed maturity securities (730) (634)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 7,028 7,278      
U.S. corporate | Consumer-non-cyclical          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 4,671 4,648      
Gross unrealized gains, fixed maturity securities 62 129      
Gross unrealized losses, fixed maturity securities (380) (272)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 4,353 4,505      
U.S. corporate | Technology and communications          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 3,011 3,187      
Gross unrealized gains, fixed maturity securities 47 75      
Gross unrealized losses, fixed maturity securities (308) (239)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 2,750 3,023      
U.S. corporate | Industrial          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 1,186 1,294      
Gross unrealized gains, fixed maturity securities 14 27      
Gross unrealized losses, fixed maturity securities (106) (88)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 1,094 1,233      
U.S. corporate | Capital goods          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 2,268 2,230      
Gross unrealized gains, fixed maturity securities 36 69      
Gross unrealized losses, fixed maturity securities (159) (118)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 2,145 2,181      
U.S. corporate | Consumer-cyclical          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 1,660 1,715      
Gross unrealized gains, fixed maturity securities 14 30      
Gross unrealized losses, fixed maturity securities (121) (96)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 1,553 1,649      
U.S. corporate | Transportation          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 1,121 1,187      
Gross unrealized gains, fixed maturity securities 32 44      
Gross unrealized losses, fixed maturity securities (91) (69)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 1,062 1,162      
U.S. corporate | Other          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 288 316      
Gross unrealized gains, fixed maturity securities 2 6      
Gross unrealized losses, fixed maturity securities (16) (13)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 274 309      
Non-U.S. corporate          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 8,154 8,182      
Gross unrealized gains, fixed maturity securities 98 162      
Gross unrealized losses, fixed maturity securities (616) (533)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 7,636 7,811      
Non-U.S. corporate | Utilities          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 778 739      
Gross unrealized gains, fixed maturity securities 0 1      
Gross unrealized losses, fixed maturity securities (68) (55)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 710 685      
Non-U.S. corporate | Energy          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 1,078 1,038      
Gross unrealized gains, fixed maturity securities 23 34      
Gross unrealized losses, fixed maturity securities (54) (45)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 1,047 1,027      
Non-U.S. corporate | Finance and insurance          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 1,961 2,041      
Gross unrealized gains, fixed maturity securities 33 47      
Gross unrealized losses, fixed maturity securities (142) (140)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 1,852 1,948      
Non-U.S. corporate | Consumer-non-cyclical          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 672 669      
Gross unrealized gains, fixed maturity securities 3 8      
Gross unrealized losses, fixed maturity securities (77) (61)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 598 616      
Non-U.S. corporate | Technology and communications          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 881 944      
Gross unrealized gains, fixed maturity securities 6 12      
Gross unrealized losses, fixed maturity securities (81) (65)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 806 891      
Non-U.S. corporate | Industrial          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 846 829      
Gross unrealized gains, fixed maturity securities 9 17      
Gross unrealized losses, fixed maturity securities (52) (49)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 803 797      
Non-U.S. corporate | Capital goods          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 639 591      
Gross unrealized gains, fixed maturity securities 4 8      
Gross unrealized losses, fixed maturity securities (48) (38)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 595 561      
Non-U.S. corporate | Consumer-cyclical          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 249 236      
Gross unrealized gains, fixed maturity securities 1 2      
Gross unrealized losses, fixed maturity securities (19) (17)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 231 221      
Non-U.S. corporate | Transportation          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 441 369      
Gross unrealized gains, fixed maturity securities 11 15      
Gross unrealized losses, fixed maturity securities (30) (20)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 422 364      
Non-U.S. corporate | Other          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 609 726      
Gross unrealized gains, fixed maturity securities 8 18      
Gross unrealized losses, fixed maturity securities (45) (43)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 572 701      
Residential mortgage-backed          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 906 953      
Gross unrealized gains, fixed maturity securities 4 8      
Gross unrealized losses, fixed maturity securities (59) (54)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities 851 907      
Commercial mortgage-backed          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 1,605 1,714      
Gross unrealized gains, fixed maturity securities 1 1      
Gross unrealized losses, fixed maturity securities (294) (290)      
Allowance for credit losses 0 (7) $ (4) $ (6) $ 0
Fair value, fixed maturity securities 1,312 1,418      
Other asset-backed          
Schedule of Investments [Line Items]          
Amortized cost or cost, fixed maturity securities 2,304 2,328      
Gross unrealized gains, fixed maturity securities 6 6      
Gross unrealized losses, fixed maturity securities (78) (96)      
Allowance for credit losses 0 0      
Fair value, fixed maturity securities $ 2,232 $ 2,238