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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Beginning of year $ 3,141 $ 11,927 $ 17,177
Net unrealized investment gains (losses) 2,399 (12,952) (3,165)
End of year 4,388 3,141 11,927
Valuation allowance 234 1,570  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | Net Unrealized Gains (Losses) on Investments      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Beginning of year (9,606) 4,809 8,811
Transition adjustment     0
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 2,048 (15,275) (3,122)
Other Comprehensive Income, Reclassification Adjustment For Sale And Write Down Of Securities Included In Income (Loss), Before Tax 563 867 (846)
Other Comprehensive Income, Reclassification Adjustment, Other   0 (33)
Unrealized Gain (Loss) on Investments 0 0 0
End of year (6,999) (9,606) 4,809
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | DAC      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Beginning of year 0 0 (1,548)
Transition adjustment     1,548
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 0 0 0
Other Comprehensive Income, Reclassification Adjustment For Sale And Write Down Of Securities Included In Income (Loss), Before Tax 0 0 0
Other Comprehensive Income, Reclassification Adjustment, Other   0 0
Unrealized Gain (Loss) on Investments 0 0 0
End of year 0 0 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | Policyholders’ Liabilities      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Beginning of year 41 (169) (1,065)
Transition adjustment     (77)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 0 0 0
Other Comprehensive Income, Reclassification Adjustment For Sale And Write Down Of Securities Included In Income (Loss), Before Tax 0 0 0
Other Comprehensive Income, Reclassification Adjustment, Other   0 0
Unrealized Gain (Loss) on Investments 9 210 973
End of year 50 41 (169)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | Deferred Income Tax Asset (Liability)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Beginning of year 440 (974) (1,302)
Transition adjustment     0
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 0 0 0
Other Comprehensive Income, Reclassification Adjustment For Sale And Write Down Of Securities Included In Income (Loss), Before Tax 0 0 0
Other Comprehensive Income, Reclassification Adjustment, Other   (1,569) 0
Unrealized Gain (Loss) on Investments (551) 2,982 328
End of year (110) 440 (974)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Beginning of year (9,125) 3,666 4,896
Transition adjustment     1,471
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax 2,048 (15,275) (3,122)
Other Comprehensive Income, Reclassification Adjustment For Sale And Write Down Of Securities Included In Income (Loss), Before Tax 563 867 (846)
Other Comprehensive Income, Reclassification Adjustment, Other   (1,569) (33)
Unrealized Gain (Loss) on Investments (542) 3,192 1,301
End of year (7,059) (9,125) 3,666
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Excluding Credit Losses [Member] | Net Unrealized Gains (Losses) on Investments      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) (6,995) (9,599) 4,810
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Excluding Credit Losses [Member] | DAC      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 0 0 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Excluding Credit Losses [Member] | Policyholders’ Liabilities      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 50 41 (169)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Excluding Credit Losses [Member] | Deferred Income Tax Asset (Liability)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) (111) 439 (974)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Excluding Credit Losses [Member] | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) (7,056) (9,119) 3,667
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Including Credit Losses [Member] | Net Unrealized Gains (Losses) on Investments      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) (4) (7) (1)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Including Credit Losses [Member] | DAC      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 0 0 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Including Credit Losses [Member] | Policyholders’ Liabilities      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 0 0 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Including Credit Losses [Member] | Deferred Income Tax Asset (Liability)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 1 1 0
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), Including Credit Losses [Member] | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) $ (3) $ (6) $ (1)