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INVESTMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 investment | Jun. 30, 2020 investment | Sep. 30, 2021 USD ($) investment | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |
Held to maturity securities transferred to available for sale securities, number of investments | investment |  | 0 | 0 | 0 |  |
Equity securities, FV-NI, unrealized gain (loss) | $ 170 |  |  | $ (33) |  |
Available for sale, fixed maturity securities, allowance for credit losses | 0 |  |  | 0 | $ 38 |
Transitional real estate loan commitments | 645 |  |  | 645 |  |
Commercial mortgage loan commitments | 0 |  |  | 0 |  |
Middle market loan program unfunded amount | 25 |  |  | 25 |  |
Middle market loan commitments | 1,700 |  |  | 1,700 |  |
Securities held to maturity, fixed maturities, amortized cost | 22,622 |  |  | 22,622 | 24,474 |
Loan Commitments, Allowance for Credit Loss | 32 |  |  | 32 |  |
Limited partnerships investment commitments | $ 1,900 |  |  | $ 1,900 |  |
Percentage that the lending policy requires that the fair value of the securities received as collateral be of the fair value of the loaned securities | 102.00% |  |  | 102.00% |  |
Percentage that the lending policy requires that the fair value of the unrestricted cash received as collateral be of the fair value of the loaned securities | 100.00% |  |  | 100.00% |  |
Securities Lending, Securities Received as Collateral | $ 7,969 |  |  | $ 7,969 | 6,654 |
Financing Receivable, Troubled Debt Restructuring | 0 |  |  | 0 |  |
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding | 0 |  |  | 0 | $ 0 |
Accounting Standards Update 2019-04 |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Reclassification From Held To Maturity To Available For Sale Debt Securities |  |  |  |  |  | $ 6,900
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Unrealized Gain Loss Net Of Tax Reclassification To Accumulated Other Comprehensive Income |  |  |  |  |  | $ 848
Zero-credit-loss expectation | Japan government and agencies |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | $ 21,500 |  |  | $ 21,500 |  |
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 18.00% |  |
TEXAS | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 13.00% |  |
FLORIDA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 9.00% |  |

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