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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 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | $ 1,477 |  | $ 787 |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 30,085 |  | 30,318 |
Held to maturity, fixed maturity securities, fair value | 37,594 |  | 36,722 |
Commercial mortgage and other loans | 9,569 |  | 6,919 |
Loans Receivable, Fair Value Disclosure | 9,648 |  | 6,893 |
Other investments, carried at amortized cost | 30 | [1] | 26 | [2]
Other investments, carried at amortized cost, fair value | 30 | [1] | 26 | [2]
Total financial instruments, assets, not carried at fair value | 39,684 |  | 37,263 |
Assets, fair value disclosure, financial instruments, carried at cost | 47,272 |  | 43,641 |
Liabilities: |  |  |  |
Other policyholders' funds | 7,317 |  | 7,146 |
Other policyholders' funds fair value disclosure | 7,234 |  | 7,067 |
Notes payable | 6,408 |  | 5,765 |
Notes payable, fair value disclosure | 6,935 |  | 5,876 |
Total financial instrument liabilities not carried at fair value | 13,725 |  | 12,911 |
Liabilities fair value disclosure financial instruments carried at cost | 14,169 |  | 12,943 |
Government and agencies |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 22,241 |  | 21,712 |
Held to maturity, fixed maturity securities, fair value | 28,291 |  | 27,038 |
Municipalities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 821 |  | 359 |
Held to maturity, fixed maturity securities, fair value | 1,083 |  | 469 |
Mortgage- and asset-backed securities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 16 |  | 14 |
Held to maturity, fixed maturity securities, fair value | 17 |  | 15 |
Public utilities |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 2,535 |  | 2,727 |
Held to maturity, fixed maturity securities, fair value | 2,954 |  | 2,973 |
Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 1,123 |  | 1,551 |
Held to maturity, fixed maturity securities, fair value | 1,320 |  | 1,840 |
Banks/financial institutions |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 916 |  | 1,445 |
Held to maturity, fixed maturity securities, fair value | 1,018 |  | 1,583 |
Other corporate |  |  |  |
Assets: |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | 2,433 |  | 2,510 |
Held to maturity, fixed maturity securities, fair value | 2,911 |  | 2,804 |
Policy loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 250 |  | 232 |
Equity method investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 569 |  | 377 |
Level 1 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 27,937 |  | 27,030 |
Loans Receivable, Fair Value Disclosure | 0 |  | 0 |
Other investments, carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets, fair value disclosure, financial instruments, carried at cost | 27,937 |  | 27,030 |
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 | 27,937 |  | 27,030 |
Level 1 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Mortgage- and asset-backed securities |  |  |  |
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 | Banks/financial institutions |  |  |  |
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 | 9,647 |  | 9,677 |
Loans Receivable, Fair Value Disclosure | 0 |  | 0 |
Other investments, carried at amortized cost, fair value | 30 | [1] | 26 | [2]
Assets, fair value disclosure, financial instruments, carried at cost | 9,677 |  | 9,703 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 0 |  | 0 |
Notes payable, fair value disclosure | 6,663 |  | 5,606 |
Liabilities fair value disclosure financial instruments carried at cost | 6,663 |  | 5,606 |
Level 2 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 354 |  | 8 |
Level 2 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 1,083 |  | 469 |
Level 2 | Mortgage- and asset-backed securities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 7 |  | 0 |
Level 2 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 2,954 |  | 2,973 |
Level 2 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 1,320 |  | 1,840 |
Level 2 | Banks/financial institutions |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 1,018 |  | 1,583 |
Level 2 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 2,911 |  | 2,804 |
Level 3 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 10 |  | 15 |
Loans Receivable, Fair Value Disclosure | 9,648 |  | 6,893 |
Other investments, carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets, fair value disclosure, financial instruments, carried at cost | 9,658 |  | 6,908 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 7,234 |  | 7,067 |
Notes payable, fair value disclosure | 272 |  | 270 |
Liabilities fair value disclosure financial instruments carried at cost | 7,506 |  | 7,337 |
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 | Mortgage- and asset-backed securities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 10 |  | 15 |
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 | Banks/financial institutions |  |  |  |
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 $250 and equity method investments of $569, at carrying value
[2] | Excludes policy loans of $232 and equity method investments of $377, at carrying value

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