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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, 2022 | Dec. 31, 2021
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 27,143 | $ 7,914
Total Unrealized Losses | 3,554 | 239
Less than 12 months Fair Value | 20,642 | 2,948
Less than 12 months Unrealized Losses | 2,381 | 42
12 months or Longer Fair Value | 6,501 | 4,966
12 months or Longer Unrealized Losses | 1,173 | 197
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 51 | 1
Total Unrealized Losses | 8 | 1
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 5 | 1
12 months or Longer Fair Value | 51 | 1
12 months or Longer Unrealized Losses | 3 | 0
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 708 | 82
Total Unrealized Losses | 105 | 2
Less than 12 months Fair Value | 675 | 79
Less than 12 months Unrealized Losses | 95 | 2
12 months or Longer Fair Value | 33 | 3
12 months or Longer Unrealized Losses | 10 | 0
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 839 | 278
Total Unrealized Losses | 74 | 2
Less than 12 months Fair Value | 723 | 278
Less than 12 months Unrealized Losses | 63 | 2
12 months or Longer Fair Value | 116 | 0
12 months or Longer Unrealized Losses | 11 | 0
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,544 | 130
Total Unrealized Losses | 181 | 5
Less than 12 months Fair Value | 1,486 | 70
Less than 12 months Unrealized Losses | 171 | 2
12 months or Longer Fair Value | 58 | 60
12 months or Longer Unrealized Losses | 10 | 3
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 29 | 37
Total Unrealized Losses | 13 | 6
Less than 12 months Fair Value | 0 | 6
Less than 12 months Unrealized Losses | 0 | 1
12 months or Longer Fair Value | 29 | 31
12 months or Longer Unrealized Losses | 13 | 5
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 968 | 292
Total Unrealized Losses | 97 | 3
Less than 12 months Fair Value | 760 | 274
Less than 12 months Unrealized Losses | 69 | 3
12 months or Longer Fair Value | 208 | 18
12 months or Longer Unrealized Losses | 28 | 0
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,276 | 1,365
Total Unrealized Losses | 1,119 | 53
Less than 12 months Fair Value | 7,463 | 458
Less than 12 months Unrealized Losses | 905 | 8
12 months or Longer Fair Value | 813 | 907
12 months or Longer Unrealized Losses | 214 | 45
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 8,091 | 2,868
Total Unrealized Losses | 1,158 | 61
Less than 12 months Fair Value | 4,300 | 445
Less than 12 months Unrealized Losses | 482 | 3
12 months or Longer Fair Value | 3,791 | 2,423
12 months or Longer Unrealized Losses | 676 | 58
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 278 | 187
Total Unrealized Losses | 40 | 5
Less than 12 months Fair Value | 166 | 53
Less than 12 months Unrealized Losses | 18 | 0
12 months or Longer Fair Value | 112 | 134
12 months or Longer Unrealized Losses | 22 | 5
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 69 | 33
Total Unrealized Losses | 8 | 1
Less than 12 months Fair Value | 46 | 0
Less than 12 months Unrealized Losses | 4 | 0
12 months or Longer Fair Value | 23 | 33
12 months or Longer Unrealized Losses | 4 | 1
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,041 | 26
Total Unrealized Losses | 87 | 2
Less than 12 months Fair Value | 929 | 0
Less than 12 months Unrealized Losses | 79 | 0
12 months or Longer Fair Value | 112 | 26
12 months or Longer Unrealized Losses | 8 | 2
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 68 |
Total Unrealized Losses | 1 |
Less than 12 months Fair Value | 34 |
Less than 12 months Unrealized Losses | 1 |
12 months or Longer Fair Value | 34 |
12 months or Longer Unrealized Losses | 0 |
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,485 | 2,074
Total Unrealized Losses | 399 | 72
Less than 12 months Fair Value | 2,625 | 1,011
Less than 12 months Unrealized Losses | 281 | 16
12 months or Longer Fair Value | 860 | 1,063
12 months or Longer Unrealized Losses | 118 | 56
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,696 | 541
Total Unrealized Losses | 264 | 26
Less than 12 months Fair Value | 1,435 | 274
Less than 12 months Unrealized Losses | 208 | 4
12 months or Longer Fair Value | 261 | 267
12 months or Longer Unrealized Losses | $ 56 | $ 22

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