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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Balance, beginning of period $ 4,388 $ 3,141 $ 11,927
Net unrealized investment gains (losses) (827) 2,399 (12,952)
Balance, end of period 3,443 4,388 3,141
Valuation allowance 217 234 1,600
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]      
Balance, beginning of period (6,999) (9,606) 4,809
Net investment gains (losses) arising during the period (1,127) 2,048 (15,275)
Included in net income (loss) 58 563 867
Other 0 0 0
Impact of net unrealized investment gains (losses) 0 0 0
Balance, end of period (8,074) (6,999) (9,606)
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]      
Balance, beginning of period 50 41 (169)
Net investment gains (losses) arising during the period 0 0 0
Included in net income (loss) 0 0 0
Other 0 0 0
Impact of net unrealized investment gains (losses) 21 9 210
Balance, end of period 71 50 41
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]      
Balance, beginning of period 226 440 (974)
Net investment gains (losses) arising during the period 0 0 0
Included in net income (loss) 0 0 0
Other 17 336 (1,569)
Impact of net unrealized investment gains (losses) 220 (551) 2,982
Balance, end of period 464 226 440
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]      
Balance, beginning of period (6,723) (9,125) 3,666
Net investment gains (losses) arising during the period (1,127) 2,048 (15,275)
Included in net income (loss) 58 563 867
Other 17 336 (1,569)
Impact of net unrealized investment gains (losses) 241 (542) 3,192
Balance, end of period (7,539) (6,723) (9,125)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | Net Unrealized Gains (Losses) on Investments      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) (8,068) (6,995) (9,599)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | Policyholders’ Liabilities      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 71 50 41
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | Deferred Income Tax Asset (Liability)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 463 225 439
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | 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) (7,534) (6,720) (9,119)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | Net Unrealized Gains (Losses) on Investments      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) (6) (4) (7)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | 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 | Net unrealized investment gains (losses) with credit losses | Deferred Income Tax Asset (Liability)      
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]      
Net unrealized investment gains (losses) 1 1 1
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) with credit losses | 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) $ (5) $ (3) $ (6)