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Gross Unrealized Losses and Fair Value of Investment Securities (Detail)
$ in Millions
Jun. 30, 2024
USD ($)
Securities
Dec. 31, 2023
USD ($)
Securities
Jun. 30, 2023
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 5,520 $ 1,459  
Less than 12 months, Gross unrealized losses $ (148) $ (40)  
Less than 12 months, Number of securities in a continuous loss position | Securities 837 223  
12 months or more, Fair value $ 27,466 $ 29,031  
12 months or more, Gross unrealized losses $ (4,134) $ (3,523)  
12 months or more, Number of securities in a continuous loss position | Securities 3,753 3,940  
Fair value $ 32,986 $ 30,490  
Gross unrealized losses $ (4,282) $ (3,563)  
Number of securities in a continuous loss position | Securities 4,590 4,163  
Investment, Type [Extensible Enumeration] Fixed Maturities [Member] Fixed Maturities [Member] Fixed Maturities [Member]
Investment grade      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 5,413 $ 1,441  
Less than 12 months, Gross unrealized losses $ (146) $ (40)  
Less than 12 months, Number of securities in a continuous loss position | Securities 814 221  
12 months or more, Fair value $ 26,434 $ 27,804  
12 months or more, Gross unrealized losses $ (4,006) $ (3,394)  
12 months or more, Number of securities in a continuous loss position | Securities 3,604 3,762  
Fair value $ 31,847 $ 29,245  
Gross unrealized losses $ (4,152) $ (3,434)  
Number of securities in a continuous loss position | Securities 4,418 3,983  
Below investment grade      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 107 $ 18  
Less than 12 months, Gross unrealized losses $ (2) $ 0  
Less than 12 months, Number of securities in a continuous loss position | Securities 23 2  
12 months or more, Fair value $ 1,032 $ 1,227  
12 months or more, Gross unrealized losses $ (128) $ (129)  
12 months or more, Number of securities in a continuous loss position | Securities 149 178  
Fair value $ 1,139 $ 1,245  
Gross unrealized losses $ (130) $ (129)  
Number of securities in a continuous loss position | Securities 172 180  
Less Than 20 Percent Below Cost      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 5,445 $ 1,450  
Less than 12 months, Gross unrealized losses $ (125) $ (37)  
Less than 12 months, Number of securities in a continuous loss position | Securities 829 221  
12 months or more, Fair value $ 23,296 $ 26,032  
12 months or more, Gross unrealized losses $ (2,635) $ (2,509)  
12 months or more, Number of securities in a continuous loss position | Securities 3,175 3,542  
Fair value $ 28,741 $ 27,482  
Gross unrealized losses $ (2,760) $ (2,546)  
Number of securities in a continuous loss position | Securities 4,004 3,763  
20 To 50 percent below cost      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 75 $ 9  
Less than 12 months, Gross unrealized losses $ (23) $ (3)  
Less than 12 months, Number of securities in a continuous loss position | Securities 8 2  
12 months or more, Fair value $ 4,170 $ 2,999  
12 months or more, Gross unrealized losses $ (1,499) $ (1,014)  
12 months or more, Number of securities in a continuous loss position | Securities 578 398  
Fair value $ 4,245 $ 3,008  
Gross unrealized losses $ (1,522) $ (1,017)  
Number of securities in a continuous loss position | Securities 586 400  
U.S. government, agencies and government-sponsored enterprises      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 688 $ 28  
Less than 12 months, Gross unrealized losses $ (13) $ (1)  
Less than 12 months, Number of securities in a continuous loss position | Securities 60 6  
12 months or more, Fair value $ 1,299 $ 1,353  
12 months or more, Gross unrealized losses $ (290) $ (214)  
12 months or more, Number of securities in a continuous loss position | Securities 49 50  
Fair value $ 1,987 $ 1,381  
Gross unrealized losses $ (303) $ (215)  
Number of securities in a continuous loss position | Securities 109 56  
State and Political Subdivisions      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 253 $ 121  
Less than 12 months, Gross unrealized losses $ (6) $ (2)  
Less than 12 months, Number of securities in a continuous loss position | Securities 38 18  
12 months or more, Fair value $ 1,571 $ 1,581  
12 months or more, Gross unrealized losses $ (289) $ (257)  
12 months or more, Number of securities in a continuous loss position | Securities 262 268  
Fair value $ 1,824 $ 1,702  
Gross unrealized losses $ (295) $ (259)  
Number of securities in a continuous loss position | Securities 300 286  
Non-U.S. government      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 164 $ 0  
Less than 12 months, Gross unrealized losses $ (3) $ 0  
Less than 12 months, Number of securities in a continuous loss position | Securities 32 0  
12 months or more, Fair value $ 420 $ 448  
12 months or more, Gross unrealized losses $ (100) $ (92)  
12 months or more, Number of securities in a continuous loss position | Securities 61 67  
Fair value $ 584 $ 448  
Gross unrealized losses $ (103) $ (92)  
Number of securities in a continuous loss position | Securities 93 67  
U.S. corporate      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 3,397 $ 1,054  
Less than 12 months, Gross unrealized losses $ (108) $ (30)  
Less than 12 months, Number of securities in a continuous loss position | Securities 500 142  
12 months or more, Fair value $ 16,313 $ 17,019  
12 months or more, Gross unrealized losses $ (2,426) $ (1,994)  
12 months or more, Number of securities in a continuous loss position | Securities 2,095 2,164  
Fair value $ 19,710 $ 18,073  
Gross unrealized losses $ (2,534) $ (2,024)  
Number of securities in a continuous loss position | Securities 2,595 2,306  
Non-U.S. corporate      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 814 $ 157  
Less than 12 months, Gross unrealized losses $ (16) $ (5)  
Less than 12 months, Number of securities in a continuous loss position | Securities 115 19  
12 months or more, Fair value $ 4,856 $ 5,180  
12 months or more, Gross unrealized losses $ (600) $ (528)  
12 months or more, Number of securities in a continuous loss position | Securities 636 684  
Fair value $ 5,670 $ 5,337  
Gross unrealized losses $ (616) $ (533)  
Number of securities in a continuous loss position | Securities 751 703  
Residential mortgage-backed      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 96 $ 62  
Less than 12 months, Gross unrealized losses $ (1) $ (1)  
Less than 12 months, Number of securities in a continuous loss position | Securities 55 31  
12 months or more, Fair value $ 495 $ 477  
12 months or more, Gross unrealized losses $ (58) $ (53)  
12 months or more, Number of securities in a continuous loss position | Securities 168 156  
Fair value $ 591 $ 539  
Gross unrealized losses $ (59) $ (54)  
Number of securities in a continuous loss position | Securities 223 187  
Commercial mortgage-backed      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 0 $ 37  
Less than 12 months, Gross unrealized losses $ 0 $ (1)  
Less than 12 months, Number of securities in a continuous loss position | Securities 0 7  
12 months or more, Fair value $ 1,286 $ 1,349  
12 months or more, Gross unrealized losses $ (294) $ (289)  
12 months or more, Number of securities in a continuous loss position | Securities 216 224  
Fair value $ 1,286 $ 1,386  
Gross unrealized losses $ (294) $ (290)  
Number of securities in a continuous loss position | Securities 216 231  
Other asset-backed      
Schedule of Investments [Line Items]      
Less than 12 months, Fair value $ 108 $ 0  
Less than 12 months, Gross unrealized losses $ (1) $ 0  
Less than 12 months, Number of securities in a continuous loss position | Securities 37 0  
12 months or more, Fair value $ 1,226 $ 1,624  
12 months or more, Gross unrealized losses $ (77) $ (96)  
12 months or more, Number of securities in a continuous loss position | Securities 266 327  
Fair value $ 1,334 $ 1,624  
Gross unrealized losses $ (78) $ (96)  
Number of securities in a continuous loss position | Securities 303 327