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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]    
Beginning of year $ 4,388 $ 3,141
Net unrealized investment gains (losses) (522) 1,634
End of year 3,755 5,471
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 (6,999) (9,606)
Net investment gains (losses) arising during the period (683) 1,555
Included in net income (loss) 26 80
Other 0 0
Impact of net unrealized investment gains (losses) 0 0
End of year (7,660) (7,978)
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 50 41
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) 13 (8)
End of year 63 33
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 226 440
Net investment gains (losses) arising during the period 0 0
Included in net income (loss) 0 0
Other 3 (342)
Impact of net unrealized investment gains (losses) 134 (342)
End of year 358 441
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Unrealized Investment Gains (Losses), All Other | AOCI Gains (Losses) Related To Net Unrealized Investment Gains (Losses)    
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]    
Beginning of year (6,723) (9,125)
Net investment gains (losses) arising during the period (683) 1,555
Included in net income (loss) 26 80
Other 3 (342)
Impact of net unrealized investment gains (losses) 147 (350)
End of year (7,239) (7,504)
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) (7,656) (7,971)
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) 63 33
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) 357 440
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Net unrealized investment gains (losses) excluding credit losses | AOCI Gains (Losses) Related To Net Unrealized Investment Gains (Losses)    
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]    
Net unrealized investment gains (losses) (7,236) (7,498)
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) (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
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 Gains (Losses) Related To Net Unrealized Investment Gains (Losses)    
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]    
Net unrealized investment gains (losses) $ (3) $ (6)