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INVESTMENTS - AFS in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | $ 30,113,886 | $ 44,775,045
Less than 12 months, Unrealized losses | (4,017,293) | (973,850)
12 months or more, Fair value | 27,191,183 | 0
12 months or more, Unrealized losses | (7,588,946) | 0
Total, Fair value | 57,305,069 | 44,775,045
Total, Unrealized losses | (11,606,239) | (973,850)
U.S. government and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 122,272 | 311,096
Less than 12 months, Unrealized losses | (52,639) | (4,768)
12 months or more, Fair value | 108,498 | 0
12 months or more, Unrealized losses | (19,855) | 0
Total, Fair value | 230,770 | 311,096
Total, Unrealized losses | (72,494) | (4,768)
U.S. state, municipal and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 2,321,404 | 2,802,309
Less than 12 months, Unrealized losses | (605,698) | (55,240)
12 months or more, Fair value | 1,780,984 | 0
12 months or more, Unrealized losses | (628,176) | 0
Total, Fair value | 4,102,388 | 2,802,309
Total, Unrealized losses | (1,233,874) | (55,240)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 14,792,384 | 30,385,514
Less than 12 months, Unrealized losses | (2,114,695) | (688,648)
12 months or more, Fair value | 17,943,907 | 0
12 months or more, Unrealized losses | (5,869,646) | 0
Total, Fair value | 32,736,291 | 30,385,514
Total, Unrealized losses | (7,984,341) | (688,648)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 3,998,737 | 3,196,876
Less than 12 months, Unrealized losses | (442,543) | (113,359)
12 months or more, Fair value | 2,068,529 | 0
12 months or more, Unrealized losses | (391,669) | 0
Total, Fair value | 6,067,266 | 3,196,876
Total, Unrealized losses | (834,212) | (113,359)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 4,054,053 | 3,405,774
Less than 12 months, Unrealized losses | (445,168) | (56,523)
12 months or more, Fair value | 2,338,517 | 0
12 months or more, Unrealized losses | (389,567) | 0
Total, Fair value | 6,392,570 | 3,405,774
Total, Unrealized losses | (834,735) | (56,523)
Collateralized bond obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 1,351,552 | 2,152,790
Less than 12 months, Unrealized losses | (103,499) | (27,466)
12 months or more, Fair value | 1,482,099 | 0
12 months or more, Unrealized losses | (114,274) | 0
Total, Fair value | 2,833,651 | 2,152,790
Total, Unrealized losses | (217,773) | (27,466)
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 1,862,608 | 1,172,330
Less than 12 months, Unrealized losses | (139,766) | (5,776)
12 months or more, Fair value | 636,014 | 0
12 months or more, Unrealized losses | (60,394) | 0
Total, Fair value | 2,498,622 | 1,172,330
Total, Unrealized losses | (200,160) | (5,776)
Asset-Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 1,610,876 | 1,348,356
Less than 12 months, Unrealized losses | (113,285) | (22,070)
12 months or more, Fair value | 832,635 | 0
12 months or more, Unrealized losses | (115,365) | 0
Total, Fair value | 2,443,511 | 1,348,356
Total, Unrealized losses | $ (228,650) | $ (22,070)

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