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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]    
Balance, beginning of period $ 3,423 $ 4,375
Net unrealized investment gains (losses) 664 (522)
Balance, end of period 4,205 3,715
Valuation allowance 225  
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 (8,074) (6,999)
Net investment gains (losses) arising during the period 844 (683)
Included in net income (loss) 8 26
Other 0 0
Impact of net unrealized investment gains (losses) 0 0
Balance, end of period (7,226) (7,660)
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 71 50
Net investment gains (losses) arising during the period 0 0
Included in net income (loss) 0 0
Other 0 0
Impact of net unrealized investment gains (losses) (5) 13
Balance, end of period 66 63
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 464 226
Net investment gains (losses) arising during the period 0 0
Included in net income (loss) 0 0
Other (8) (3)
Impact of net unrealized investment gains (losses) (178) 134
Balance, end of period 279 358
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 (7,539) (6,723)
Net investment gains (losses) arising during the period 844 (683)
Included in net income (loss) 8 26
Other (8) (3)
Impact of net unrealized investment gains (losses) (183) 147
Balance, end of period (6,881) (7,239)
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) (7,222) (7,656)
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) 66 63
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) 278 357
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) (6,878) (7,236)
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) (4) (4)
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
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
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) $ (3) $ (3)