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Gross Unrealized Losses and Fair Value of Corporate Securities Based on Industries (Detail) $ in Millions | Jun. 30, 2024 USD ($) Securities | Dec. 31, 2023 USD ($) Securities | Jun. 30, 2023
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Available for Sale Securities Continuous Unrealized Loss Position [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]
U.S. corporate |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [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 |
U.S. corporate | Utilities |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 855 | $ 177 |
Less than 12 months, Gross unrealized losses | $ (18) | $ (2) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 114 | 21 |
12 months or more, Fair value | $ 2,096 | $ 2,129 |
12 months or more, Gross unrealized losses | $ (436) | $ (350) |
12 months or more, Number of securities in a continuous loss position | Securities | 309 | 308 |
Fair value | $ 2,951 | $ 2,306 |
Gross unrealized losses | $ (454) | $ (352) |
Number of securities in a continuous loss position | Securities | 423 | 329 |
U.S. corporate | Energy |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 256 | $ 122 |
Less than 12 months, Gross unrealized losses | $ (19) | $ (2) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 49 | 20 |
12 months or more, Fair value | $ 1,254 | $ 1,343 |
12 months or more, Gross unrealized losses | $ (150) | $ (141) |
12 months or more, Number of securities in a continuous loss position | Securities | 162 | 168 |
Fair value | $ 1,510 | $ 1,465 |
Gross unrealized losses | $ (169) | $ (143) |
Number of securities in a continuous loss position | Securities | 211 | 188 |
U.S. corporate | Finance and insurance |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 648 | $ 274 |
Less than 12 months, Gross unrealized losses | $ (13) | $ (8) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 88 | 42 |
12 months or more, Fair value | $ 4,996 | $ 5,192 |
12 months or more, Gross unrealized losses | $ (717) | $ (626) |
12 months or more, Number of securities in a continuous loss position | Securities | 625 | 645 |
Fair value | $ 5,644 | $ 5,466 |
Gross unrealized losses | $ (730) | $ (634) |
Number of securities in a continuous loss position | Securities | 713 | 687 |
U.S. corporate | Consumer-non-cyclical |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 573 | $ 173 |
Less than 12 months, Gross unrealized losses | $ (17) | $ (6) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 82 | 18 |
12 months or more, Fair value | $ 2,483 | $ 2,529 |
12 months or more, Gross unrealized losses | $ (363) | $ (266) |
12 months or more, Number of securities in a continuous loss position | Securities | 273 | 280 |
Fair value | $ 3,056 | $ 2,702 |
Gross unrealized losses | $ (380) | $ (272) |
Number of securities in a continuous loss position | Securities | 355 | 298 |
U.S. corporate | Technology and communications |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 323 | $ 105 |
Less than 12 months, Gross unrealized losses | $ (13) | $ (6) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 53 | 19 |
12 months or more, Fair value | $ 1,936 | $ 2,100 |
12 months or more, Gross unrealized losses | $ (295) | $ (233) |
12 months or more, Number of securities in a continuous loss position | Securities | 256 | 269 |
Fair value | $ 2,259 | $ 2,205 |
Gross unrealized losses | $ (308) | $ (239) |
Number of securities in a continuous loss position | Securities | 309 | 288 |
U.S. corporate | Industrial |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 150 | $ 50 |
Less than 12 months, Gross unrealized losses | $ (5) | $ (1) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 17 | 6 |
12 months or more, Fair value | $ 670 | $ 702 |
12 months or more, Gross unrealized losses | $ (101) | $ (87) |
12 months or more, Number of securities in a continuous loss position | Securities | 92 | 96 |
Fair value | $ 820 | $ 752 |
Gross unrealized losses | $ (106) | $ (88) |
Number of securities in a continuous loss position | Securities | 109 | 102 |
U.S. corporate | Capital goods |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 242 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (14) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 41 | 0 |
12 months or more, Fair value | $ 1,106 | $ 1,193 |
12 months or more, Gross unrealized losses | $ (145) | $ (118) |
12 months or more, Number of securities in a continuous loss position | Securities | 142 | 150 |
Fair value | $ 1,348 | $ 1,193 |
Gross unrealized losses | $ (159) | $ (118) |
Number of securities in a continuous loss position | Securities | 183 | 150 |
U.S. corporate | Consumer-cyclical |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 179 | $ 88 |
Less than 12 months, Gross unrealized losses | $ (4) | $ (1) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 34 | 11 |
12 months or more, Fair value | $ 1,047 | $ 1,073 |
12 months or more, Gross unrealized losses | $ (117) | $ (95) |
12 months or more, Number of securities in a continuous loss position | Securities | 142 | 148 |
Fair value | $ 1,226 | $ 1,161 |
Gross unrealized losses | $ (121) | $ (96) |
Number of securities in a continuous loss position | Securities | 176 | 159 |
U.S. corporate | Transportation |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 127 | $ 65 |
Less than 12 months, Gross unrealized losses | $ (4) | $ (4) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 17 | 5 |
12 months or more, Fair value | $ 582 | $ 621 |
12 months or more, Gross unrealized losses | $ (87) | $ (65) |
12 months or more, Number of securities in a continuous loss position | Securities | 75 | 82 |
Fair value | $ 709 | $ 686 |
Gross unrealized losses | $ (91) | $ (69) |
Number of securities in a continuous loss position | Securities | 92 | 87 |
U.S. corporate | Other |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 44 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (1) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 5 | 0 |
12 months or more, Fair value | $ 143 | $ 137 |
12 months or more, Gross unrealized losses | $ (15) | $ (13) |
12 months or more, Number of securities in a continuous loss position | Securities | 19 | 18 |
Fair value | $ 187 | $ 137 |
Gross unrealized losses | $ (16) | $ (13) |
Number of securities in a continuous loss position | Securities | 24 | 18 |
Non-U.S. corporate |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [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 |
Non-U.S. corporate | Utilities |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 104 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (2) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 11 | 0 |
12 months or more, Fair value | $ 575 | $ 609 |
12 months or more, Gross unrealized losses | $ (66) | $ (55) |
12 months or more, Number of securities in a continuous loss position | Securities | 65 | 68 |
Fair value | $ 679 | $ 609 |
Gross unrealized losses | $ (68) | $ (55) |
Number of securities in a continuous loss position | Securities | 76 | 68 |
Non-U.S. corporate | Energy |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 122 | $ 39 |
Less than 12 months, Gross unrealized losses | $ (2) | $ (1) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 15 | 4 |
12 months or more, Fair value | $ 450 | $ 487 |
12 months or more, Gross unrealized losses | $ (52) | $ (44) |
12 months or more, Number of securities in a continuous loss position | Securities | 53 | 59 |
Fair value | $ 572 | $ 526 |
Gross unrealized losses | $ (54) | $ (45) |
Number of securities in a continuous loss position | Securities | 68 | 63 |
Non-U.S. corporate | Finance and insurance |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 144 | $ 100 |
Less than 12 months, Gross unrealized losses | $ (2) | $ (2) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 29 | 10 |
12 months or more, Fair value | $ 1,328 | $ 1,358 |
12 months or more, Gross unrealized losses | $ (140) | $ (138) |
12 months or more, Number of securities in a continuous loss position | Securities | 186 | 203 |
Fair value | $ 1,472 | $ 1,458 |
Gross unrealized losses | $ (142) | $ (140) |
Number of securities in a continuous loss position | Securities | 215 | 213 |
Non-U.S. corporate | Consumer-non-cyclical |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 97 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (5) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 14 | 0 |
12 months or more, Fair value | $ 416 | $ 471 |
12 months or more, Gross unrealized losses | $ (72) | $ (61) |
12 months or more, Number of securities in a continuous loss position | Securities | 50 | 55 |
Fair value | $ 513 | $ 471 |
Gross unrealized losses | $ (77) | $ (61) |
Number of securities in a continuous loss position | Securities | 64 | 55 |
Non-U.S. corporate | Technology and communications |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 63 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (1) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 9 | 0 |
12 months or more, Fair value | $ 597 | $ 659 |
12 months or more, Gross unrealized losses | $ (80) | $ (65) |
12 months or more, Number of securities in a continuous loss position | Securities | 74 | 83 |
Fair value | $ 660 | $ 659 |
Gross unrealized losses | $ (81) | $ (65) |
Number of securities in a continuous loss position | Securities | 83 | 83 |
Non-U.S. corporate | Industrial |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 94 | $ 18 |
Less than 12 months, Gross unrealized losses | $ (1) | $ (2) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 16 | 5 |
12 months or more, Fair value | $ 418 | $ 436 |
12 months or more, Gross unrealized losses | $ (51) | $ (47) |
12 months or more, Number of securities in a continuous loss position | Securities | 60 | 61 |
Fair value | $ 512 | $ 454 |
Gross unrealized losses | $ (52) | $ (49) |
Number of securities in a continuous loss position | Securities | 76 | 66 |
Non-U.S. corporate | Capital goods |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 105 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (2) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 12 | 0 |
12 months or more, Fair value | $ 356 | $ 384 |
12 months or more, Gross unrealized losses | $ (46) | $ (38) |
12 months or more, Number of securities in a continuous loss position | Securities | 47 | 49 |
Fair value | $ 461 | $ 384 |
Gross unrealized losses | $ (48) | $ (38) |
Number of securities in a continuous loss position | Securities | 59 | 49 |
Non-U.S. corporate | Consumer-cyclical |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 0 | $ 0 |
Less than 12 months, Gross unrealized losses | $ 0 | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 0 | 0 |
12 months or more, Fair value | $ 170 | $ 188 |
12 months or more, Gross unrealized losses | $ (19) | $ (17) |
12 months or more, Number of securities in a continuous loss position | Securities | 25 | 26 |
Fair value | $ 170 | $ 188 |
Gross unrealized losses | $ (19) | $ (17) |
Number of securities in a continuous loss position | Securities | 25 | 26 |
Non-U.S. corporate | Transportation |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 0 | $ 0 |
Less than 12 months, Gross unrealized losses | $ 0 | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 0 | 0 |
12 months or more, Fair value | $ 266 | $ 216 |
12 months or more, Gross unrealized losses | $ (30) | $ (20) |
12 months or more, Number of securities in a continuous loss position | Securities | 35 | 30 |
Fair value | $ 266 | $ 216 |
Gross unrealized losses | $ (30) | $ (20) |
Number of securities in a continuous loss position | Securities | 35 | 30 |
Non-U.S. corporate | Other |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 85 | $ 0 |
Less than 12 months, Gross unrealized losses | $ (1) | $ 0 |
Less than 12 months, Number of securities in a continuous loss position | Securities | 9 | 0 |
12 months or more, Fair value | $ 280 | $ 372 |
12 months or more, Gross unrealized losses | $ (44) | $ (43) |
12 months or more, Number of securities in a continuous loss position | Securities | 41 | 50 |
Fair value | $ 365 | $ 372 |
Gross unrealized losses | $ (45) | $ (43) |
Number of securities in a continuous loss position | Securities | 50 | 50 |
Corporate Debt Securities |  |  |
Available for Sale Securities Continuous Unrealized Loss Position [Line Items] |  |  |
Less than 12 months, Fair value | $ 4,211 | $ 1,211 |
Less than 12 months, Gross unrealized losses | $ (124) | $ (35) |
Less than 12 months, Number of securities in a continuous loss position | Securities | 615 | 161 |
12 months or more, Fair value | $ 21,169 | $ 22,199 |
12 months or more, Gross unrealized losses | $ (3,026) | $ (2,522) |
12 months or more, Number of securities in a continuous loss position | Securities | 2,731 | 2,848 |
Fair value | $ 25,380 | $ 23,410 |
Gross unrealized losses | $ (3,150) | $ (2,557) |
Number of securities in a continuous loss position | Securities | 3,346 | 3,009 |

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