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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Beginning of year $ 5,471 $ 9,456 $ 3,141 $ 11,927
End of year 5,260 7,111 5,260 7,111
Unrealized Investment Gains Losses All Other | Net Unrealized Gains (Losses) on Investments | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Beginning of year (7,978) (1,287) (9,606) 4,809
Net investment gains (losses) arising during the period (710) (5,889) 845 (12,314)
Included in net income (loss) 46 214 126 548
Excluded from net income (loss) 0 0    
Other 0 0 0 0
Impact of net unrealized investment gains (losses) 0 0 0 0
Net unrealized investment gains (losses) excluding credit losses   (6,962)    
End of year (8,641) (6,965) (8,641) (6,965)
Unrealized Investment Gains Losses All Other | Policyholders’ Liabilities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Beginning of year 33 4 41 (169)
Impact of net unrealized investment gains (losses) 3 21 (5) 194
End of year 36 25 36 25
Unrealized Investment Gains Losses All Other | Policyholders’ Liabilities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities, AFS        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) excluding credit losses   25    
Unrealized Investment Gains Losses All Other | Deferred Income Tax Asset (Liability) | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Beginning of year 99 269 440 (974)
Other 0 0 0  
Impact of net unrealized investment gains (losses) 139 1,187 (203) 2,429
End of year 238 1,457 238 1,457
Unrealized Investment Gains Losses All Other | Deferred Income Tax Asset (Liability) | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities, AFS        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) excluding credit losses   1,456    
Unrealized Investment Gains Losses All Other | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses) | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Beginning of year (7,846) (1,014) (9,125) 3,666
Net investment gains (losses) arising during the period (710) (5,889) 845 (12,314)
Included in net income (loss) 46 214 126 548
Excluded from net income (loss) 0 0    
Other 0 0 0 0
Impact of net unrealized investment gains (losses) 142 1,208 (208) 2,623
Net unrealized investment gains (losses) excluding credit losses   (5,481)    
End of year (8,367) (5,483) (8,367) (5,483)
Net Unrealized Gains (Losses) On Investments Excluding Credit Losses | Net Unrealized Gains (Losses) on Investments | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) excluding credit losses (8,642)   (8,635) (6,957)
Net Unrealized Gains (Losses) On Investments Excluding Credit Losses | Policyholders’ Liabilities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities, AFS        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) excluding credit losses 36   36 25
Net Unrealized Gains (Losses) On Investments Excluding Credit Losses | Deferred Income Tax Asset (Liability) | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities, AFS        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) excluding credit losses 238   237 1,455
Net Unrealized Gains (Losses) On Investments Excluding Credit Losses | AOCI Gain (Loss) Related to Net Unrealized Investment Gains (Losses) | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) excluding credit losses (8,368)   (8,362) (5,477)
Net Unrealized Gains (Losses) On Investments Including Credit Losses | Net Unrealized Gains (Losses) on Investments | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) with credit losses 1 (3) (6) (8)
Net Unrealized Gains (Losses) On Investments Including Credit Losses | Policyholders’ Liabilities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities, AFS        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) with credit losses 0 0 0 0
Net Unrealized Gains (Losses) On Investments Including Credit Losses | Deferred Income Tax Asset (Liability) | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities, AFS        
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]        
Net unrealized investment gains (losses) with credit losses 0 1 1 2
Net Unrealized Gains (Losses) On Investments Including 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) with credit losses $ 1 $ (2) $ (5) $ (6)