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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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