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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Securities Carried at 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] |  |
Held to maturity, fixed maturity securities, fair value | $ 27,748 | $ 30,399
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 26,304 | 28,810
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 1,444 | 1,589
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Government and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 26,541 | 29,070
Government and agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 26,304 | 28,810
Government and agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 237 | 260
Government and agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Government and agencies | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 26,541 | 29,070
Government and agencies | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 26,304 | 28,810
Government and agencies | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 237 | 260
Government and agencies | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 453 | 499
Municipalities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 453 | 499
Municipalities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 453 | 499
Municipalities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 453 | 499
Municipalities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 57 | 61
Public utilities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 57 | 61
Public utilities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 57 | 61
Public utilities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 57 | 61
Public utilities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 667 | 736
Sovereign and supranational | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 667 | 736
Sovereign and supranational | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 322 | 736
Sovereign and supranational | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 322 | 736
Sovereign and supranational | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Consensus pricing valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 345 |
Sovereign and supranational | Consensus pricing valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 |
Sovereign and supranational | Consensus pricing valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 345 |
Sovereign and supranational | Consensus pricing valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 |
Other corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 30 | 33
Other corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 30 | 33
Other corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 30 | 33
Other corporate | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 30 | 33
Other corporate | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | $ 0 | $ 0

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