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INVESTMENTS - AFS Fixed Maturity Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | $ 73,600,788 | $ 69,519,496 |
Allowance for Credit Losses | (128,332) | (88,133) | $ (120,895)
Gross unrealized gains | 73,312 | 413,373 |
Gross unrealized losses | (11,606,239) | (973,850) |
Fair value | 61,939,529 | 68,870,886 |
Allowance for credit losses at acquisition | (29,900) | (46,400) |
U.S. government and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 438,931 | 785,144 |
Allowance for Credit Losses | 0 | 0 |
Gross unrealized gains | 304 | 4,171 |
Gross unrealized losses | (72,494) | (4,768) |
Fair value | 366,741 | 784,547 |
U.S. state, municipal and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 5,638,252 | 5,122,651 |
Allowance for Credit Losses | 0 | 0 |
Gross unrealized gains | 6,582 | 42,286 |
Gross unrealized losses | (1,233,874) | (55,240) |
Fair value | 4,410,960 | 5,109,697 |
Corporate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 44,253,062 | 41,433,757 |
Allowance for Credit Losses | (1,298) | (3,238) | $ 0
Gross unrealized gains | 49,509 | 190,516 |
Gross unrealized losses | (7,984,341) | (688,648) |
Fair value | 36,316,932 | 40,932,387 |
Residential mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 7,307,526 | 7,703,030 |
Allowance for Credit Losses | (100,554) | (50,975) |
Gross unrealized gains | 12,052 | 126,662 |
Gross unrealized losses | (834,212) | (113,359) |
Fair value | 6,384,812 | 7,665,358 |
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 7,269,662 | 5,952,656 |
Allowance for Credit Losses | (14,490) | (282) |
Gross unrealized gains | 36 | 16,332 |
Gross unrealized losses | (834,735) | (56,523) |
Fair value | 6,420,473 | 5,912,183 |
Collateralized bond obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 3,051,850 | 3,111,620 |
Allowance for Credit Losses | (426) | (22,160) |
Gross unrealized gains | 0 | 6,862 |
Gross unrealized losses | (217,773) | (27,466) |
Fair value | 2,833,651 | 3,068,856 |
CLOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 2,726,888 | 2,985,098 |
Allowance for Credit Losses | (6,165) | (639) |
Gross unrealized gains | 127 | 6,554 |
Gross unrealized losses | (200,160) | (5,776) |
Fair value | 2,520,690 | 2,985,237 |
Asset-Backed Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost or amortized cost | 2,914,617 | 2,425,540 |
Allowance for Credit Losses | (5,399) | (10,839) |
Gross unrealized gains | 4,702 | 19,990 |
Gross unrealized losses | (228,650) | (22,070) |
Fair value | $ 2,685,270 | $ 2,412,621 |

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