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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 23,627 | $ 25,402
Total Unrealized Losses | 3,502 | 3,449
Less than 12 months Fair Value | 4,673 | 4,239
Less than 12 months Unrealized Losses | 471 | 364
12 months or Longer Fair Value | 18,954 | 21,163
12 months or Longer Unrealized Losses | 3,031 | 3,085
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 141 | 123
Total Unrealized Losses | 4 | 4
Less than 12 months Fair Value | 59 | 53
Less than 12 months Unrealized Losses | 1 | 1
12 months or Longer Fair Value | 82 | 70
12 months or Longer Unrealized Losses | 3 | 3
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 662 | 703
Total Unrealized Losses | 49 | 38
Less than 12 months Fair Value | 9 | 31
Less than 12 months Unrealized Losses | 0 | 1
12 months or Longer Fair Value | 653 | 672
12 months or Longer Unrealized Losses | 49 | 37
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 754 | 925
Total Unrealized Losses | 48 | 56
Less than 12 months Fair Value | 304 | 340
Less than 12 months Unrealized Losses | 4 | 6
12 months or Longer Fair Value | 450 | 585
12 months or Longer Unrealized Losses | 44 | 50
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,383 | 1,120
Total Unrealized Losses | 136 | 114
Less than 12 months Fair Value | 391 | 228
Less than 12 months Unrealized Losses | 9 | 4
12 months or Longer Fair Value | 992 | 892
12 months or Longer Unrealized Losses | 127 | 110
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 14 | 35
Total Unrealized Losses | 4 | 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 | 4 | 8
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 628 | 655
Total Unrealized Losses | 41 | 51
Less than 12 months Fair Value | 228 | 159
Less than 12 months Unrealized Losses | 2 | 4
12 months or Longer Fair Value | 400 | 496
12 months or Longer Unrealized Losses | 39 | 47
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 6,196 | 6,380
Total Unrealized Losses | 724 | 665
Less than 12 months Fair Value | 1,254 | 799
Less than 12 months Unrealized Losses | 36 | 19
12 months or Longer Fair Value | 4,942 | 5,581
12 months or Longer Unrealized Losses | 688 | 646
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 7,828 | 8,393
Total Unrealized Losses | 1,811 | 1,696
Less than 12 months Fair Value | 1,628 | 1,657
Less than 12 months Unrealized Losses | 395 | 303
12 months or Longer Fair Value | 6,200 | 6,736
12 months or Longer Unrealized Losses | 1,416 | 1,393
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 277 | 301
Total Unrealized Losses | 59 | 58
Less than 12 months Fair Value | 31 | 34
Less than 12 months Unrealized Losses | 1 | 0
12 months or Longer Fair Value | 246 | 267
12 months or Longer Unrealized Losses | 58 | 58
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 54 | 58
Total Unrealized Losses | 12 | 11
Less than 12 months Fair Value | 1 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 53 | 58
12 months or Longer Unrealized Losses | 12 | 11
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 915 | 1,028
Total Unrealized Losses | 77 | 82
Less than 12 months Fair Value | 351 | 444
Less than 12 months Unrealized Losses | 13 | 13
12 months or Longer Fair Value | 564 | 584
12 months or Longer Unrealized Losses | 64 | 69
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 55 | 60
Total Unrealized Losses | 7 | 7
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 55 | 60
12 months or Longer Unrealized Losses | 7 | 7
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,973 | 3,673
Total Unrealized Losses | 285 | 365
Less than 12 months Fair Value | 62 | 186
Less than 12 months Unrealized Losses | 1 | 4
12 months or Longer Fair Value | 2,911 | 3,487
12 months or Longer Unrealized Losses | 284 | 361
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,747 | 1,948
Total Unrealized Losses | 245 | 294
Less than 12 months Fair Value | 355 | 308
Less than 12 months Unrealized Losses | 9 | 9
12 months or Longer Fair Value | 1,392 | 1,640
12 months or Longer Unrealized Losses | $ 236 | $ 285

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