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INVESTMENTS - Fair Value and Gross Unrealized Losses for Securities That Have Been in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 24,554 | $ 25,402
Total Unrealized Losses | 4,315 | 3,449
Less than 12 months Fair Value | 6,609 | 4,239
Less than 12 months Unrealized Losses | 708 | 364
12 months or Longer Fair Value | 17,945 | 21,163
12 months or Longer Unrealized Losses | 3,607 | 3,085
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 114 | 123
Total Unrealized Losses | 4 | 4
Less than 12 months Fair Value | 38 | 53
Less than 12 months Unrealized Losses | 1 | 1
12 months or Longer Fair Value | 76 | 70
12 months or Longer Unrealized Losses | 3 | 3
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 670 | 703
Total Unrealized Losses | 49 | 38
Less than 12 months Fair Value | 29 | 31
Less than 12 months Unrealized Losses | 1 | 1
12 months or Longer Fair Value | 641 | 672
12 months or Longer Unrealized Losses | 48 | 37
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 684 | 925
Total Unrealized Losses | 44 | 56
Less than 12 months Fair Value | 167 | 340
Less than 12 months Unrealized Losses | 1 | 6
12 months or Longer Fair Value | 517 | 585
12 months or Longer Unrealized Losses | 43 | 50
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,438 | 1,120
Total Unrealized Losses | 150 | 114
Less than 12 months Fair Value | 445 | 228
Less than 12 months Unrealized Losses | 15 | 4
12 months or Longer Fair Value | 993 | 892
12 months or Longer Unrealized Losses | 135 | 110
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 14 | 35
Total Unrealized Losses | 3 | 8
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 14 | 35
12 months or Longer Unrealized Losses | 3 | 8
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 753 | 655
Total Unrealized Losses | 50 | 51
Less than 12 months Fair Value | 345 | 159
Less than 12 months Unrealized Losses | 8 | 4
12 months or Longer Fair Value | 408 | 496
12 months or Longer Unrealized Losses | 42 | 47
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 6,336 | 6,380
Total Unrealized Losses | 823 | 665
Less than 12 months Fair Value | 1,473 | 799
Less than 12 months Unrealized Losses | 43 | 19
12 months or Longer Fair Value | 4,863 | 5,581
12 months or Longer Unrealized Losses | 780 | 646
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,156 | 8,393
Total Unrealized Losses | 2,376 | 1,696
Less than 12 months Fair Value | 2,577 | 1,657
Less than 12 months Unrealized Losses | 574 | 303
12 months or Longer Fair Value | 5,579 | 6,736
12 months or Longer Unrealized Losses | 1,802 | 1,393
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 339 | 301
Total Unrealized Losses | 74 | 58
Less than 12 months Fair Value | 123 | 34
Less than 12 months Unrealized Losses | 4 | 0
12 months or Longer Fair Value | 216 | 267
12 months or Longer Unrealized Losses | 70 | 58
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 223 | 58
Total Unrealized Losses | 22 | 11
Less than 12 months Fair Value | 41 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 182 | 58
12 months or Longer Unrealized Losses | 22 | 11
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 951 | 1,028
Total Unrealized Losses | 94 | 82
Less than 12 months Fair Value | 492 | 444
Less than 12 months Unrealized Losses | 18 | 13
12 months or Longer Fair Value | 459 | 584
12 months or Longer Unrealized Losses | 76 | 69
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 25 | 60
Total Unrealized Losses | 7 | 7
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 1 | 0
12 months or Longer Fair Value | 25 | 60
12 months or Longer Unrealized Losses | 6 | 7
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,132 | 3,673
Total Unrealized Losses | 332 | 365
Less than 12 months Fair Value | 450 | 186
Less than 12 months Unrealized Losses | 23 | 4
12 months or Longer Fair Value | 2,682 | 3,487
12 months or Longer Unrealized Losses | 309 | 361
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,719 | 1,948
Total Unrealized Losses | 287 | 294
Less than 12 months Fair Value | 429 | 308
Less than 12 months Unrealized Losses | 19 | 9
12 months or Longer Fair Value | 1,290 | 1,640
12 months or Longer Unrealized Losses | $ 268 | $ 285

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