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INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | $ 79,797 |  | $ 79,797 |  | $ 74,033
Allowance for Credit Losses | 4 |  | 4 |  | 4
Gross Unrealized Gains | 291 |  | 291 |  | 409
Gross Unrealized Losses | 8,505 |  | 8,505 |  | 7,408
Fair Value | 71,579 |  | 71,579 |  | 67,030
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Due in one year or less | 2,187 |  | 2,187 |  |
Due in years two through five | 15,150 |  | 15,150 |  |
Due in years six through ten | 17,658 |  | 17,658 |  |
Due after ten years | 24,490 |  | 24,490 |  |
Subtotal | 59,485 |  | 59,485 |  |
Amortized Cost (Less Allowance for Credit Losses) | 79,793 |  | 79,793 |  |
Fair Value |  |  |  |  |
Due in one year or less | 2,158 |  | 2,158 |  |
Due in years two through five | 14,599 |  | 14,599 |  |
Due in years six through ten | 16,426 |  | 16,426 |  |
Due after ten years | 18,675 |  | 18,675 |  |
Subtotal | 51,858 |  | 51,858 |  |
Fair Value | 71,579 |  | 71,579 |  | 67,030
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments |  |  |  |  |
Proceeds from sales | 1,331 | $ 2,230 | 1,775 | $ 3,055 |
Gross gains on sales | 5 | 5 | 5 | 7 |
Gross losses on sales | (3) | (43) | (27) | (69) |
Net (increase) decrease in Allowance for Credit and Intent to Sell losses | (3) | (7) | (5) | (63) |
Fixed Maturities - Credit Loss Impairments |  |  |  |  |
Balance, beginning of period | 48 | 89 | 48 | 36 |
Previously recognized impairments on securities that matured, paid, prepaid or sold | (4) | (54) | (8) | (57) |
Recognized impairments on securities impaired to fair value this period | 0 | 0 | 0 | 52 |
Credit losses recognized this period on securities for which credit losses were not previously recognized | 3 | 6 | 6 | 9 |
Additional credit losses this period on securities previously impaired | 3 | 3 | 4 | 4 |
Balance, end of period | 50 | $ 44 | 50 | $ 44 |
Corporate |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 52,490 |  | 52,490 |  | 49,786
Allowance for Credit Losses | 4 |  | 4 |  | 4
Gross Unrealized Gains | 209 |  | 209 |  | 320
Gross Unrealized Losses | 6,265 |  | 6,265 |  | 5,360
Fair Value | 46,430 |  | 46,430 |  | 44,742
Fair Value |  |  |  |  |
Fair Value | 46,430 |  | 46,430 |  | 44,742
U.S. government, agencies and authorities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 5,773 |  | 5,773 |  | 5,735
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 0 |  | 0 |  | 2
Gross Unrealized Losses | 1,362 |  | 1,362 |  | 1,106
Fair Value | 4,411 |  | 4,411 |  | 4,631
Fair Value |  |  |  |  |
Fair Value | 4,411 |  | 4,411 |  | 4,631
States and political subdivisions |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 519 |  | 519 |  | 614
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 2 |  | 2 |  | 9
Gross Unrealized Losses | 84 |  | 84 |  | 74
Fair Value | 437 |  | 437 |  | 549
Fair Value |  |  |  |  |
Fair Value | 437 |  | 437 |  | 549
Foreign governments |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 707 |  | 707 |  | 719
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 1 |  | 1 |  | 3
Gross Unrealized Losses | 128 |  | 128 |  | 111
Fair Value | 580 |  | 580 |  | 611
Fair Value |  |  |  |  |
Fair Value | 580 |  | 580 |  | 611
Residential mortgage-backed |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 3,519 |  | 3,519 |  | 2,470
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 10 |  | 10 |  | 18
Gross Unrealized Losses | 150 |  | 150 |  | 133
Fair Value | 3,379 |  | 3,379 |  | 2,355
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 3,519 |  | 3,519 |  |
Fair Value |  |  |  |  |
Without single maturity date | 3,379 |  | 3,379 |  |
Fair Value | 3,379 |  | 3,379 |  | 2,355
Asset-backed |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 12,869 |  | 12,869 |  | 11,058
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 64 |  | 64 |  | 52
Gross Unrealized Losses | 76 |  | 76 |  | 109
Fair Value | 12,857 |  | 12,857 |  | 11,001
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 12,869 |  | 12,869 |  |
Fair Value |  |  |  |  |
Without single maturity date | 12,857 |  | 12,857 |  |
Fair Value | 12,857 |  | 12,857 |  | 11,001
Commercial mortgage-backed |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 3,864 |  | 3,864 |  | 3,595
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 2 |  | 2 |  | 2
Gross Unrealized Losses | 439 |  | 439 |  | 515
Fair Value | 3,427 |  | 3,427 |  | 3,082
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 3,864 |  | 3,864 |  |
Fair Value |  |  |  |  |
Without single maturity date | 3,427 |  | 3,427 |  |
Fair Value | 3,427 |  | 3,427 |  | 3,082
Redeemable preferred stock |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Amortized Cost | 56 |  | 56 |  | 56
Allowance for Credit Losses | 0 |  | 0 |  | 0
Gross Unrealized Gains | 3 |  | 3 |  | 3
Gross Unrealized Losses | 1 |  | 1 |  | 0
Fair Value | 58 |  | 58 |  | 59
Amortized Cost (Less Allowance for Credit Losses) |  |  |  |  |
Without single maturity date | 56 |  | 56 |  |
Fair Value |  |  |  |  |
Without single maturity date | 58 |  | 58 |  |
Fair Value | $ 58 |  | $ 58 |  | $ 59

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