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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
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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 |

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