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INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 75,270 |  | $ 74,033
Allowance for Credit Losses | 4 |  | 4
Gross Unrealized Gains | 337 |  | 409
Gross Unrealized Losses | 7,997 |  | 7,408
Fair Value | 67,606 |  | 67,030
Amortized Cost (Less Allowance for Credit Losses) |  |  |
Due in one year or less | 1,898 |  |
Due in years two through five | 14,627 |  |
Due in years six through ten | 16,210 |  |
Due after ten years | 24,292 |  |
Subtotal | 57,027 |  |
Amortized Cost (Less Allowance for Credit Losses) | 75,266 |  |
Fair Value |  |  |
Due in one year or less | 1,877 |  |
Due in years two through five | 14,108 |  |
Due in years six through ten | 15,013 |  |
Due after ten years | 18,959 |  |
Subtotal | 49,957 |  |
Fair Value | 67,606 |  | 67,030
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments |  |  |
Proceeds from sales | 444 | $ 825 |
Gross gains on sales | 0 | 2 |
Gross losses on sales | (24) | (26) |
Net (increase) decrease in Allowance for Credit and Intent to Sell losses | (2) | (56) |
Fixed Maturities - Credit Loss Impairments |  |  |
Balance, beginning of period | 48 | 36 |
Previously recognized impairments on securities that matured, paid, prepaid or sold | (4) | (3) |
Recognized impairments on securities impaired to fair value this period | 0 | 52 |
Credit losses recognized this period on securities for which credit losses were not previously recognized | 3 | 3 |
Additional credit losses this period on securities previously impaired | 1 | 1 |
Balance, end of period | 48 | $ 89 |
Corporate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 49,975 |  | 49,786
Allowance for Credit Losses | 4 |  | 4
Gross Unrealized Gains | 252 |  | 320
Gross Unrealized Losses | 5,865 |  | 5,360
Fair Value | 44,358 |  | 44,742
Fair Value |  |  |
Fair Value | 44,358 |  | 44,742
U.S. government, agencies and authorities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 5,759 |  | 5,735
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 0 |  | 2
Gross Unrealized Losses | 1,264 |  | 1,106
Fair Value | 4,495 |  | 4,631
Fair Value |  |  |
Fair Value | 4,495 |  | 4,631
States and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 586 |  | 614
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 6 |  | 9
Gross Unrealized Losses | 79 |  | 74
Fair Value | 513 |  | 549
Fair Value |  |  |
Fair Value | 513 |  | 549
Foreign governments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 711 |  | 719
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 2 |  | 3
Gross Unrealized Losses | 122 |  | 111
Fair Value | 591 |  | 611
Fair Value |  |  |
Fair Value | 591 |  | 611
Residential mortgage-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 2,678 |  | 2,470
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 10 |  | 18
Gross Unrealized Losses | 148 |  | 133
Fair Value | 2,540 |  | 2,355
Amortized Cost (Less Allowance for Credit Losses) |  |  |
Without single maturity date | 2,678 |  |
Fair Value |  |  |
Without single maturity date | 2,540 |  |
Fair Value | 2,540 |  | 2,355
Asset-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 11,852 |  | 11,058
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 60 |  | 52
Gross Unrealized Losses | 85 |  | 109
Fair Value | 11,827 |  | 11,001
Amortized Cost (Less Allowance for Credit Losses) |  |  |
Without single maturity date | 11,852 |  |
Fair Value |  |  |
Without single maturity date | 11,827 |  |
Fair Value | 11,827 |  | 11,001
Commercial mortgage-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 3,653 |  | 3,595
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 4 |  | 2
Gross Unrealized Losses | 434 |  | 515
Fair Value | 3,223 |  | 3,082
Amortized Cost (Less Allowance for Credit Losses) |  |  |
Without single maturity date | 3,653 |  |
Fair Value |  |  |
Without single maturity date | 3,223 |  |
Fair Value | 3,223 |  | 3,082
Redeemable preferred stock |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 56 |  | 56
Allowance for Credit Losses | 0 |  | 0
Gross Unrealized Gains | 3 |  | 3
Gross Unrealized Losses | 0 |  | 0
Fair Value | 59 |  | 59
Amortized Cost (Less Allowance for Credit Losses) |  |  |
Without single maturity date | 56 |  |
Fair Value |  |  |
Without single maturity date | 59 |  |
Fair Value | $ 59 |  | $ 59

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