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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 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 26,342 | $ 31,709
Total Unrealized Losses | 2,806 | 4,528
Less than 12 months Fair Value | 6,137 | 20,347
Less than 12 months Unrealized Losses | 379 | 2,213
12 months or Longer Fair Value | 20,205 | 11,362
12 months or Longer Unrealized Losses | 2,427 | 2,315
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 179 | 159
Total Unrealized Losses | 7 | 8
Less than 12 months Fair Value | 97 | 85
Less than 12 months Unrealized Losses | 3 | 3
12 months or Longer Fair Value | 82 | 74
12 months or Longer Unrealized Losses | 4 | 5
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 700 | 854
Total Unrealized Losses | 51 | 89
Less than 12 months Fair Value | 96 | 735
Less than 12 months Unrealized Losses | 6 | 57
12 months or Longer Fair Value | 604 | 119
12 months or Longer Unrealized Losses | 45 | 32
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,057 | 936
Total Unrealized Losses | 70 | 84
Less than 12 months Fair Value | 753 | 640
Less than 12 months Unrealized Losses | 55 | 42
12 months or Longer Fair Value | 304 | 296
12 months or Longer Unrealized Losses | 15 | 42
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,296 | 1,852
Total Unrealized Losses | 143 | 180
Less than 12 months Fair Value | 690 | 1,667
Less than 12 months Unrealized Losses | 58 | 144
12 months or Longer Fair Value | 606 | 185
12 months or Longer Unrealized Losses | 85 | 36
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 33 | 30
Total Unrealized Losses | 10 | 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 | 10 | 12
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 857 | 1,147
Total Unrealized Losses | 70 | 105
Less than 12 months Fair Value | 387 | 786
Less than 12 months Unrealized Losses | 13 | 58
12 months or Longer Fair Value | 470 | 361
12 months or Longer Unrealized Losses | 57 | 47
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 7,385 | 10,529
Total Unrealized Losses | 795 | 1,201
Less than 12 months Fair Value | 2,691 | 8,636
Less than 12 months Unrealized Losses | 118 | 785
12 months or Longer Fair Value | 4,694 | 1,893
12 months or Longer Unrealized Losses | 677 | 416
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,274 | 8,856
Total Unrealized Losses | 975 | 1,724
Less than 12 months Fair Value | 529 | 3,733
Less than 12 months Unrealized Losses | 102 | 580
12 months or Longer Fair Value | 7,745 | 5,123
12 months or Longer Unrealized Losses | 873 | 1,144
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 283 | 286
Total Unrealized Losses | 35 | 61
Less than 12 months Fair Value | 0 | 150
Less than 12 months Unrealized Losses | 0 | 26
12 months or Longer Fair Value | 283 | 136
12 months or Longer Unrealized Losses | 35 | 35
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 61 | 62
Total Unrealized Losses | 6 | 12
Less than 12 months Fair Value | 0 | 38
Less than 12 months Unrealized Losses | 0 | 6
12 months or Longer Fair Value | 61 | 24
12 months or Longer Unrealized Losses | 6 | 6
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 710 | 880
Total Unrealized Losses | 51 | 108
Less than 12 months Fair Value | 57 | 576
Less than 12 months Unrealized Losses | 2 | 61
12 months or Longer Fair Value | 653 | 304
12 months or Longer Unrealized Losses | 49 | 47
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 63 | 71
Total Unrealized Losses | 4 | 5
Less than 12 months Fair Value | 0 | 34
Less than 12 months Unrealized Losses | 0 | 4
12 months or Longer Fair Value | 63 | 37
12 months or Longer Unrealized Losses | 4 | 1
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,626 | 3,957
Total Unrealized Losses | 309 | 531
Less than 12 months Fair Value | 425 | 1,760
Less than 12 months Unrealized Losses | 9 | 174
12 months or Longer Fair Value | 3,201 | 2,197
12 months or Longer Unrealized Losses | 300 | 357
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,818 | 2,090
Total Unrealized Losses | 280 | 408
Less than 12 months Fair Value | 412 | 1,507
Less than 12 months Unrealized Losses | 13 | 273
12 months or Longer Fair Value | 1,406 | 583
12 months or Longer Unrealized Losses | $ 267 | $ 135

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