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INVESTMENTS - Fair Value and Gross Unrealized Losses for Securities That Have Been in Continuous Unrealized Loss Position (Detail) - Fixed maturity securities - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 28,535 | $ 31,709
Total Unrealized Losses | 4,421 | 4,528
Less than 12 months Fair Value | 7,104 | 20,347
Less than 12 months Unrealized Losses | 419 | 2,213
12 months or Longer Fair Value | 21,431 | 11,362
12 months or Longer Unrealized Losses | 4,002 | 2,315
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 179 | 159
Total Unrealized Losses | 10 | 8
Less than 12 months Fair Value | 42 | 85
Less than 12 months Unrealized Losses | 1 | 3
12 months or Longer Fair Value | 137 | 74
12 months or Longer Unrealized Losses | 9 | 5
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 738 | 854
Total Unrealized Losses | 112 | 89
Less than 12 months Fair Value | 123 | 735
Less than 12 months Unrealized Losses | 7 | 57
12 months or Longer Fair Value | 615 | 119
12 months or Longer Unrealized Losses | 105 | 32
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,094 | 936
Total Unrealized Losses | 74 | 84
Less than 12 months Fair Value | 804 | 640
Less than 12 months Unrealized Losses | 61 | 42
12 months or Longer Fair Value | 290 | 296
12 months or Longer Unrealized Losses | 13 | 42
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,754 | 1,852
Total Unrealized Losses | 238 | 180
Less than 12 months Fair Value | 944 | 1,667
Less than 12 months Unrealized Losses | 96 | 144
12 months or Longer Fair Value | 810 | 185
12 months or Longer Unrealized Losses | 142 | 36
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 33 | 30
Total Unrealized Losses | 9 | 12
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 33 | 30
12 months or Longer Unrealized Losses | 9 | 12
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,043 | 1,147
Total Unrealized Losses | 99 | 105
Less than 12 months Fair Value | 460 | 786
Less than 12 months Unrealized Losses | 16 | 58
12 months or Longer Fair Value | 583 | 361
12 months or Longer Unrealized Losses | 83 | 47
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,831 | 10,529
Total Unrealized Losses | 1,243 | 1,201
Less than 12 months Fair Value | 2,994 | 8,636
Less than 12 months Unrealized Losses | 166 | 785
12 months or Longer Fair Value | 5,837 | 1,893
12 months or Longer Unrealized Losses | 1,077 | 416
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 7,997 | 8,856
Total Unrealized Losses | 1,695 | 1,724
Less than 12 months Fair Value | 656 | 3,733
Less than 12 months Unrealized Losses | 24 | 580
12 months or Longer Fair Value | 7,341 | 5,123
12 months or Longer Unrealized Losses | 1,671 | 1,144
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 283 | 286
Total Unrealized Losses | 58 | 61
Less than 12 months Fair Value | 32 | 150
Less than 12 months Unrealized Losses | 0 | 26
12 months or Longer Fair Value | 251 | 136
12 months or Longer Unrealized Losses | 58 | 35
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 54 | 62
Total Unrealized Losses | 11 | 12
Less than 12 months Fair Value | 0 | 38
Less than 12 months Unrealized Losses | 0 | 6
12 months or Longer Fair Value | 54 | 24
12 months or Longer Unrealized Losses | 11 | 6
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 963 | 880
Total Unrealized Losses | 89 | 108
Less than 12 months Fair Value | 415 | 576
Less than 12 months Unrealized Losses | 18 | 61
12 months or Longer Fair Value | 548 | 304
12 months or Longer Unrealized Losses | 71 | 47
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 58 | 71
Total Unrealized Losses | 6 | 5
Less than 12 months Fair Value | 0 | 34
Less than 12 months Unrealized Losses | 0 | 4
12 months or Longer Fair Value | 58 | 37
12 months or Longer Unrealized Losses | 6 | 1
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,491 | 3,957
Total Unrealized Losses | 403 | 531
Less than 12 months Fair Value | 110 | 1,760
Less than 12 months Unrealized Losses | 3 | 174
12 months or Longer Fair Value | 3,381 | 2,197
12 months or Longer Unrealized Losses | 400 | 357
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,017 | 2,090
Total Unrealized Losses | 374 | 408
Less than 12 months Fair Value | 524 | 1,507
Less than 12 months Unrealized Losses | 27 | 273
12 months or Longer Fair Value | 1,493 | 583
12 months or Longer Unrealized Losses | $ 347 | $ 135

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