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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | $ 3,612 |  | $ 2,429 |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 22,622 |  | 24,474 |
Held to maturity, fixed maturity securities, fair value | 27,748 |  | 30,399 |
Commercial mortgage and other loans | 11,388 |  | 10,554 |
Commercial mortgage and other loans, fair value | 11,596 |  | 10,655 |
Other investments carried at amortized cost | 19 | [1] | 26 | [2]
Other investments carried at amortized cost, fair value | 19 | [1] | 26 | [2]
Total financial instruments assets not carried at fair value | 34,020 |  | 35,044 |
Assets fair value disclosure financial instruments carried at cost | 39,363 |  | 41,080 |
Liabilities: |  |  |  |
Other policyholders’ funds | 7,286 |  | 7,824 |
Other policyholders' funds fair value disclosure | 7,175 |  | 7,709 |
Notes payable | 7,937 |  | 7,745 |
Notes payable, fair value disclosure | 8,682 |  | 8,684 |
Total financial instrument liabilities not carried at fair value | 15,223 |  | 15,569 |
Liabilities fair value disclosure financial instruments carried at cost | 15,857 |  | 16,393 |
Government and agencies |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 21,673 |  | 23,445 |
Held to maturity, fixed maturity securities, fair value | 26,541 |  | 29,070 |
Municipalities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 346 |  | 377 |
Held to maturity, fixed maturity securities, fair value | 453 |  | 499 |
Public utilities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 44 |  | 47 |
Held to maturity, fixed maturity securities, fair value | 57 |  | 61 |
Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 528 |  | 571 |
Held to maturity, fixed maturity securities, fair value | 667 |  | 736 |
Other corporate |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 22 |  | 24 |
Held to maturity, fixed maturity securities, fair value | 30 |  | 33 |
Policy loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 241 |  | 260 |
Equity method investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 1,519 |  | 1,004 |
Level 1 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 26,304 |  | 28,810 |
Commercial mortgage and other loans, fair value | 0 |  | 0 |
Other investments carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets fair value disclosure financial instruments carried at cost | 26,304 |  | 28,810 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 0 |  | 0 |
Notes payable, fair value disclosure | 0 |  | 0 |
Liabilities fair value disclosure financial instruments carried at cost | 0 |  | 0 |
Level 1 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 26,304 |  | 28,810 |
Level 1 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 2 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 1,444 |  | 1,589 |
Commercial mortgage and other loans, fair value | 0 |  | 0 |
Other investments carried at amortized cost, fair value | 19 | [1] | 26 | [2]
Assets fair value disclosure financial instruments carried at cost | 1,463 |  | 1,615 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 0 |  | 0 |
Notes payable, fair value disclosure | 8,416 |  | 8,396 |
Liabilities fair value disclosure financial instruments carried at cost | 8,416 |  | 8,396 |
Level 2 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 237 |  | 260 |
Level 2 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 453 |  | 499 |
Level 2 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 57 |  | 61 |
Level 2 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 667 |  | 736 |
Level 2 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 30 |  | 33 |
Level 3 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Commercial mortgage and other loans, fair value | 11,596 |  | 10,655 |
Other investments carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets fair value disclosure financial instruments carried at cost | 11,596 |  | 10,655 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 7,175 |  | 7,709 |
Notes payable, fair value disclosure | 266 |  | 288 |
Liabilities fair value disclosure financial instruments carried at cost | 7,441 |  | 7,997 |
Level 3 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | $ 0 |  | $ 0 |
[1] | Excludes policy loans of $241 and equity method investments of $1,519, at carrying value
[2] | Excludes policy loans of $260 and equity method investments of $1,004, at carrying value

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