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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Securities Carried at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | $ 91,262 | $ 82,895
Equity securities | 802 | 987
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,878 | 32,993
Equity securities | 642 | 874
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 55,697 | 49,380
Equity securities | 80 | 67
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 687 | 522
Equity securities | 80 | 46
Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 722 | 941
Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 642 | 874
Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 80 | 67
Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 0 | 0
Net asset value valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 80 | 46
Net asset value valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 0 | 0
Net asset value valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 0 | 0
Net asset value valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Equity securities | 80 | 46
Government and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 36,400 | 34,342
Government and agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,878 | 32,993
Government and agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,522 | 1,349
Government and agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Government and agencies | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 36,400 | 34,342
Government and agencies | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,878 | 32,993
Government and agencies | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,522 | 1,349
Government and agencies | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Municipalities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,847 | 1,863
Municipalities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Municipalities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,847 | 1,863
Municipalities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Municipalities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,847 | 1,863
Municipalities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Municipalities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,847 | 1,863
Municipalities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Mortgage- and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 410 | 339
Mortgage- and asset-backed securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Mortgage- and asset-backed securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 232 | 162
Mortgage- and asset-backed securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 178 | 177
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 232 | 162
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 232 | 162
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Mortgage- and asset-backed securities | Consensus pricing valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 178 | 177
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 178 | 177
Public utilities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 6,780 | 7,171
Public utilities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Public utilities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 6,556 | 7,062
Public utilities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 224 | 109
Public utilities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 6,556 | 7,062
Public utilities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Public utilities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 6,556 | 7,062
Public utilities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Public utilities | Discounted cash flow technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 224 | 109
Public utilities | Discounted cash flow technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Public utilities | Discounted cash flow technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Public utilities | Discounted cash flow technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 224 | 109
Sovereign and supranational |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,042 | 1,260
Sovereign and supranational | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Sovereign and supranational | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,042 | 1,260
Sovereign and supranational | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Sovereign and supranational | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,042 | 1,260
Sovereign and supranational | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Sovereign and supranational | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 1,042 | 1,260
Sovereign and supranational | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Banks/financial institutions |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 10,287 | 8,918
Banks/financial institutions | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Banks/financial institutions | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 10,264 | 8,895
Banks/financial institutions | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 23 | 23
Banks/financial institutions | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 10,264 | 8,895
Banks/financial institutions | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Banks/financial institutions | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 10,264 | 8,895
Banks/financial institutions | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Banks/financial institutions | Consensus pricing valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 23 | 23
Banks/financial institutions | Consensus pricing valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Banks/financial institutions | Consensus pricing valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Banks/financial institutions | Consensus pricing valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 23 | 23
Other corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,496 | 29,002
Other corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Other corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,234 | 28,789
Other corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 262 | 213
Other corporate | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,234 | 28,789
Other corporate | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Other corporate | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 34,234 | 28,789
Other corporate | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Other corporate | Discounted cash flow technique |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 262 | 213
Other corporate | Discounted cash flow technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Other corporate | Discounted cash flow technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | 0 | 0
Other corporate | Discounted cash flow technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available for sale, fixed maturity securities | $ 262 | $ 213

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