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INVESTMENTS - Investments in Variable Interest Entities Not Consolidated (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Available for sale, fixed maturity securities, amortized cost |  | $ 87,228 | $ 91,630
Available for sale, fixed maturity securities |  | 100,722 | 105,882
Securities held to maturity, fixed maturities, amortized cost |  | 22,622 | 24,474
Held to maturity, fixed maturity securities, fair value |  | 27,748 | 30,399
Other investments |  | 3,612 | 2,429
Assets, fair value |  | 110,969 | 114,028
Variable Interest Entity, Not Consolidated |  |  |
Variable Interest Entity [Line Items] |  |  |
Available for sale, fixed maturity securities, amortized cost |  | 4,990 | 5,477
Available for sale, fixed maturity securities |  | 6,119 | 6,767
Other investments | [1] | 247 | 178
Other investments, fair value | [1] | 247 | 178
Assets, amortized cost |  | 5,237 | 5,655
Assets, fair value |  | $ 6,366 | $ 6,945
[1] | Consists entirely of alternative investments in limited partnerships

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