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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 28,481 | $ 31,709
Total Unrealized Losses | 3,082 | 4,528
Less than 12 months Fair Value | 7,880 | 20,347
Less than 12 months Unrealized Losses | 462 | 2,213
12 months or Longer Fair Value | 20,601 | 11,362
12 months or Longer Unrealized Losses | 2,620 | 2,315
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 149 | 159
Total Unrealized Losses | 5 | 8
Less than 12 months Fair Value | 62 | 85
Less than 12 months Unrealized Losses | 1 | 3
12 months or Longer Fair Value | 87 | 74
12 months or Longer Unrealized Losses | 4 | 5
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 817 | 854
Total Unrealized Losses | 55 | 89
Less than 12 months Fair Value | 356 | 735
Less than 12 months Unrealized Losses | 13 | 57
12 months or Longer Fair Value | 461 | 119
12 months or Longer Unrealized Losses | 42 | 32
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,007 | 936
Total Unrealized Losses | 69 | 84
Less than 12 months Fair Value | 753 | 640
Less than 12 months Unrealized Losses | 58 | 42
12 months or Longer Fair Value | 254 | 296
12 months or Longer Unrealized Losses | 11 | 42
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,380 | 1,852
Total Unrealized Losses | 128 | 180
Less than 12 months Fair Value | 776 | 1,667
Less than 12 months Unrealized Losses | 53 | 144
12 months or Longer Fair Value | 604 | 185
12 months or Longer Unrealized Losses | 75 | 36
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 31 | 30
Total Unrealized Losses | 11 | 12
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 31 | 30
12 months or Longer Unrealized Losses | 11 | 12
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 982 | 1,147
Total Unrealized Losses | 85 | 105
Less than 12 months Fair Value | 448 | 786
Less than 12 months Unrealized Losses | 17 | 58
12 months or Longer Fair Value | 534 | 361
12 months or Longer Unrealized Losses | 68 | 47
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,128 | 10,529
Total Unrealized Losses | 798 | 1,201
Less than 12 months Fair Value | 3,297 | 8,636
Less than 12 months Unrealized Losses | 119 | 785
12 months or Longer Fair Value | 4,831 | 1,893
12 months or Longer Unrealized Losses | 679 | 416
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,845 | 8,856
Total Unrealized Losses | 1,079 | 1,724
Less than 12 months Fair Value | 565 | 3,733
Less than 12 months Unrealized Losses | 77 | 580
12 months or Longer Fair Value | 8,280 | 5,123
12 months or Longer Unrealized Losses | 1,002 | 1,144
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 303 | 286
Total Unrealized Losses | 42 | 61
Less than 12 months Fair Value | 57 | 150
Less than 12 months Unrealized Losses | 4 | 26
12 months or Longer Fair Value | 246 | 136
12 months or Longer Unrealized Losses | 38 | 35
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 70 | 62
Total Unrealized Losses | 8 | 12
Less than 12 months Fair Value | 5 | 38
Less than 12 months Unrealized Losses | 0 | 6
12 months or Longer Fair Value | 65 | 24
12 months or Longer Unrealized Losses | 8 | 6
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 726 | 880
Total Unrealized Losses | 63 | 108
Less than 12 months Fair Value | 37 | 576
Less than 12 months Unrealized Losses | 2 | 61
12 months or Longer Fair Value | 689 | 304
12 months or Longer Unrealized Losses | 61 | 47
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 72 | 71
Total Unrealized Losses | 3 | 5
Less than 12 months Fair Value | 35 | 34
Less than 12 months Unrealized Losses | 3 | 4
12 months or Longer Fair Value | 37 | 37
12 months or Longer Unrealized Losses | 0 | 1
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,907 | 3,957
Total Unrealized Losses | 427 | 531
Less than 12 months Fair Value | 736 | 1,760
Less than 12 months Unrealized Losses | 43 | 174
12 months or Longer Fair Value | 3,171 | 2,197
12 months or Longer Unrealized Losses | 384 | 357
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,064 | 2,090
Total Unrealized Losses | 309 | 408
Less than 12 months Fair Value | 753 | 1,507
Less than 12 months Unrealized Losses | 72 | 273
12 months or Longer Fair Value | 1,311 | 583
12 months or Longer Unrealized Losses | $ 237 | $ 135

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