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INVESTMENTS - Maturity Distribution for AFS Fixed Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Cost or amortized cost (net of allowance) |  |
Due in one year or less | $ 604,921 |
Due after one year through five years | 11,066,139 |
Due after five years through ten years | 9,624,879 |
Due after ten years | 29,033,008 |
Subtotal | 50,328,947 |
Cost or amortized cost | 73,472,456 |
Fair value |  |
Due in one year or less | 597,102 |
Due after one year through five years | 10,472,837 |
Due after five years through ten years | 8,715,144 |
Due after ten years | 21,309,550 |
Subtotal | 41,094,633 |
Fair value | 61,939,529 | $ 68,870,886
Residential mortgage-backed securities |  |
Cost or amortized cost (net of allowance) |  |
Without single maturity date | 7,206,972 |
Fair value |  |
Without single maturity date | 6,384,812 |
Fair value | 6,384,812 | 7,665,358
Commercial mortgage-backed securities |  |
Cost or amortized cost (net of allowance) |  |
Without single maturity date | 7,255,172 |
Fair value |  |
Without single maturity date | 6,420,473 |
Fair value | 6,420,473 | 5,912,183
Collateralized bond obligations |  |
Cost or amortized cost (net of allowance) |  |
Without single maturity date | 3,051,424 |
Fair value |  |
Without single maturity date | 2,833,651 |
Fair value | 2,833,651 | 3,068,856
CLOs |  |
Cost or amortized cost (net of allowance) |  |
Without single maturity date | 2,720,723 |
Fair value |  |
Without single maturity date | 2,520,690 |
Fair value | 2,520,690 | 2,985,237
Asset-Backed Securities |  |
Cost or amortized cost (net of allowance) |  |
Without single maturity date | 2,909,218 |
Fair value |  |
Without single maturity date | 2,685,270 |
Fair value | $ 2,685,270 | $ 2,412,621

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