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INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | $ 73,994 |  | $ 73,994 |  | $ 72,991
Allowance for Credit Losses | 2 |  | 2 |  | 24
Gross Unrealized Gains | 147 |  | 147 |  | 106
Gross Unrealized Losses | 8,788 |  | 8,788 |  | 9,712
Fair Value | 65,351 |  | 65,351 |  | 63,361
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Due in one year or less | 1,510 |  | 1,510 |  |
Due in years two through five | 14,339 |  | 14,339 |  |
Due in years six through ten | 17,371 |  | 17,371 |  |
Due after ten years | 25,712 |  | 25,712 |  |
Subtotal | 58,932 |  | 58,932 |  |
Amortized cost | 73,992 |  | 73,992 |  |
Fair Value |  |  |  |  |
Due in one year or less | 1,491 |  | 1,491 |  |
Due in years two through five | 13,546 |  | 13,546 |  |
Due in years six through ten | 15,778 |  | 15,778 |  |
Due after ten years | 20,444 |  | 20,444 |  |
Subtotal | 51,259 |  | 51,259 |  |
Fair Value | 65,351 |  | 65,351 |  | 63,361
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments |  |  |  |  |
Proceeds from sales | 2,230 | $ 3,344 | 3,055 | $ 10,735 |
Gross gains on sales | 5 | 15 | 7 | 44 |
Debt Securities, Available For Sale Securities, Gross Realized Losses Cost Basis Methodology Of Securities Sold | (43) | (227) | (69) | (591) |
Gross losses on sales | 7 | (2) | 63 | (3) |
Fixed Maturities - Credit Loss Impairments |  |  |  |  |
Balance, beginning of period | 89 | 43 | 36 | 44 |
Previously recognized impairments on securities that matured, paid, prepaid or sold | 54 | 13 | 57 | 15 |
Recognized impairments on securities impaired to fair value this period | 0 | 0 | 52 | 0 |
Credit losses recognized this period on securities for which credit losses were not previously recognized | 6 | 1 | 9 | 1 |
Additional credit losses this period on securities previously impaired | 3 | 1 | 4 | 2 |
Increases due to passage of time on previously recorded credit losses | 0 | 0 | 0 | 0 |
Accretion of previously recognized impairments due to increases in expected cash flows (for OTTI securities 2019 and prior) | 0 | 0 | 0 | 0 |
Balance, end of period | 44 | $ 32 | 44 | $ 32 |
Corporate |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 50,420 |  | 50,420 |  | 50,712
Allowance for Credit Losses | 2 |  | 2 |  | 24
Gross Unrealized Gains | 121 |  | 121 |  | 89
Gross Unrealized Losses | 6,496 |  | 6,496 |  | 7,206
Fair Value | 44,043 |  | 44,043 |  | 43,571
Fair Value |  |  |  |  |
Fair Value | 44,043 |  | 44,043 |  | 43,571
U.S. government, agencies and authorities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 6,998 |  | 6,998 |  | 7,054
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 1 |  | 1 |  | 1
Gross Unrealized Losses | 1,104 |  | 1,104 |  | 1,218
Fair Value | 5,895 |  | 5,895 |  | 5,837
Fair Value |  |  |  |  |
Fair Value | 5,895 |  | 5,895 |  | 5,837
States and political subdivisions |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 622 |  | 622 |  | 609
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 9 |  | 9 |  | 7
Gross Unrealized Losses | 78 |  | 78 |  | 89
Fair Value | 553 |  | 553 |  | 527
Fair Value |  |  |  |  |
Fair Value | 553 |  | 553 |  | 527
Foreign governments |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 894 |  | 894 |  | 985
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 3 |  | 3 |  | 2
Gross Unrealized Losses | 129 |  | 129 |  | 151
Fair Value | 768 |  | 768 |  | 836
Fair Value |  |  |  |  |
Fair Value | 768 |  | 768 |  | 836
Residential Mortgage-Backed |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 1,389 |  | 1,389 |  | 908
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 1 |  | 1 |  | 1
Gross Unrealized Losses | 100 |  | 100 |  | 87
Fair Value | 1,290 |  | 1,290 |  | 822
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 1,389 |  | 1,389 |  |
Fair Value |  |  |  |  |
Without single maturity date | 1,290 |  | 1,290 |  |
Fair Value | 1,290 |  | 1,290 |  | 822
Asset-backed |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 9,741 |  | 9,741 |  | 8,859
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 9 |  | 9 |  | 4
Gross Unrealized Losses | 281 |  | 281 |  | 373
Fair Value | 9,469 |  | 9,469 |  | 8,490
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 9,741 |  | 9,741 |  |
Fair Value |  |  |  |  |
Without single maturity date | 9,469 |  | 9,469 |  |
Fair Value | 9,469 |  | 9,469 |  | 8,490
Commercial mortgage-backed |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 3,889 |  | 3,889 |  | 3,823
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | 600 |  | 600 |  | 588
Fair Value | 3,289 |  | 3,289 |  | 3,235
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 3,889 |  | 3,889 |  |
Fair Value |  |  |  |  |
Without single maturity date | 3,289 |  | 3,289 |  |
Fair Value | 3,289 |  | 3,289 |  | 3,235
Redeemable Preferred Stock |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 41 |  | 41 |  | 41
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 3 |  | 3 |  | 2
Gross Unrealized Losses | 0 |  | 0 |  | 0
Fair Value | 44 |  | 44 |  | 43
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 41 |  | 41 |  |
Fair Value |  |  |  |  |
Without single maturity date | 44 |  | 44 |  |
Fair Value | $ 44 |  | $ 44 |  | $ 43

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