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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 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fixed maturity securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 7,946 | $ 10,781
Total Unrealized Losses | 235 | 481
Less than 12 months Fair Value | 2,609 | 6,902
Less than 12 months Unrealized Losses | 31 | 184
12 months or Longer Fair Value | 5,337 | 3,879
12 months or Longer Unrealized Losses | 204 | 297
Yen-denominated | Fixed maturity securities | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,980 | 2,604
Total Unrealized Losses | 62 | 52
Less than 12 months Fair Value | 342 | 2,604
Less than 12 months Unrealized Losses | 2 | 52
12 months or Longer Fair Value | 2,638 | 0
12 months or Longer Unrealized Losses | 60 | 0
Yen-denominated | Fixed maturity securities | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 168 | 183
Total Unrealized Losses | 5 | 5
Less than 12 months Fair Value | 30 | 169
Less than 12 months Unrealized Losses | 0 | 4
12 months or Longer Fair Value | 138 | 14
12 months or Longer Unrealized Losses | 5 | 1
Yen-denominated | Fixed maturity securities | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 34 | 37
Total Unrealized Losses | 1 | 1
Less than 12 months Fair Value | 0 | 37
Less than 12 months Unrealized Losses | 0 | 1
12 months or Longer Fair Value | 34 | 0
12 months or Longer Unrealized Losses | 1 | 0
Yen-denominated | Fixed maturity securities | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 242 | 135
Total Unrealized Losses | 2 | 1
Less than 12 months Fair Value | 182 | 135
Less than 12 months Unrealized Losses | 1 | 1
12 months or Longer Fair Value | 60 | 0
12 months or Longer Unrealized Losses | 1 | 0
Yen-denominated | Fixed maturity securities | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 558 | 613
Total Unrealized Losses | 22 | 37
Less than 12 months Fair Value | 106 | 290
Less than 12 months Unrealized Losses | 1 | 13
12 months or Longer Fair Value | 452 | 323
12 months or Longer Unrealized Losses | 21 | 24
Yen-denominated | Fixed maturity securities | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,824 | 1,809
Total Unrealized Losses | 66 | 102
Less than 12 months Fair Value | 735 | 765
Less than 12 months Unrealized Losses | 5 | 36
12 months or Longer Fair Value | 1,089 | 1,044
12 months or Longer Unrealized Losses | 61 | 66
Dollar-denominated | Fixed maturity securities | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 56 | 94
Total Unrealized Losses | 1 | 2
Less than 12 months Fair Value | 56 | 94
Less than 12 months Unrealized Losses | 1 | 2
12 months or Longer Fair Value | 0 | 0
12 months or Longer Unrealized Losses | 0 | 0
Dollar-denominated | Fixed maturity securities | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value |  | 360
Total Unrealized Losses |  | 5
Less than 12 months Fair Value |  | 360
Less than 12 months Unrealized Losses |  | 5
12 months or Longer Fair Value |  | 0
12 months or Longer Unrealized Losses |  | 0
Dollar-denominated | Fixed maturity securities | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 195 | 326
Total Unrealized Losses | 4 | 15
Less than 12 months Fair Value | 108 | 208
Less than 12 months Unrealized Losses | 2 | 7
12 months or Longer Fair Value | 87 | 118
12 months or Longer Unrealized Losses | 2 | 8
Dollar-denominated | Fixed maturity securities | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,731 | 4,499
Total Unrealized Losses | 67 | 251
Less than 12 months Fair Value | 898 | 2,157
Less than 12 months Unrealized Losses | 17 | 59
12 months or Longer Fair Value | 833 | 2,342
12 months or Longer Unrealized Losses | 50 | 192
Dollar-denominated | Fixed maturity securities | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 6 | 39
Total Unrealized Losses | 4 | 3
Less than 12 months Fair Value | 6 | 39
Less than 12 months Unrealized Losses | 1 | 3
12 months or Longer Fair Value | 0 | 0
12 months or Longer Unrealized Losses | 3 | 0
Dollar-denominated | Fixed maturity securities | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 152 | 82
Total Unrealized Losses | 1 | 7
Less than 12 months Fair Value | 146 | 44
Less than 12 months Unrealized Losses | 1 | 1
12 months or Longer Fair Value | 6 | 38
12 months or Longer Unrealized Losses | $ 0 | $ 6

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