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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Debt Securities, Available-For-Sale, Net Unrealized Investments [Roll Forward]        
Beginning of year $ 3,755 $ 5,471 $ 4,388 $ 3,141
Net unrealized investment gains (losses) (442) (663) (964) 971
End of year 3,385 5,260 3,385 5,260
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 (7,660) (7,978) (6,999) (9,606)
Net investment gains (losses) arising during the period (555) (710) (1,238) 845
Included in net income (loss) 0 46 26 126
Excluded from net income (loss) 0 0    
Other 0 0 0 0
Impact of net unrealized investment gains (losses) 0 0 0 0
End of year (8,214) (8,641) (8,214) (8,641)
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 63 33 50 41
Net investment gains (losses) arising during the period 0 0 0 0
Included in net income (loss) 0 0 0 0
Excluded from net income (loss) 0 0    
Other 0 0 0 0
Impact of net unrealized investment gains (losses) 4 3 17 (5)
End of year 67 36 67 36
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 358 441 226 440
Net investment gains (losses) arising during the period 0 0 0 0
Included in net income (loss) 0 0 0 0
Excluded from net income (loss) 0 0    
Other (4) (139) (7) 203
Impact of net unrealized investment gains (losses) 117 139 251 (203)
End of year 471 441 471 441
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 (7,239) (7,504) (6,723) (9,125)
Net investment gains (losses) arising during the period (555) (710) (1,238) 845
Included in net income (loss) 0 46 26 126
Excluded from net income (loss) 0 0    
Other (4) (139) (7) 203
Impact of net unrealized investment gains (losses) 121 142 268 (208)
End of year (7,676) (8,164) (7,676) (8,164)
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) (8,215) (8,642) (8,211) (8,635)
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) 67 36 67 36
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) 471 441 470 440
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) (7,677) (8,165) (7,674) (8,159)
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) 1 1 (3) (6)
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 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) 0 0 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) $ 1 $ 1 $ (2) $ (5)