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INVESTMENTS - Net Unrealized Gain (Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]    
Beginning of year $ 3,141 $ 11,927
End of year 5,471 9,456
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 (9,606) 4,809
Net investment gains (losses) arising during the period 1,555 (6,425)
Included in net income (loss) 80 334
Other 0 0
Impact of net unrealized investment gains (losses) 0 0
End of year (7,978) (1,287)
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 41 (169)
Impact of net unrealized investment gains (losses) (8) 173
End of year 33 4
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 440 (974)
Other 0  
Impact of net unrealized investment gains (losses) (342) 1,242
End of year 99 269
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 (9,125) 3,666
Net investment gains (losses) arising during the period 1,555 (6,425)
Included in net income (loss) 80 334
Other 0 0
Impact of net unrealized investment gains (losses) (350) 1,415
End of year (7,846) (1,014)
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]    
End of year (7,971) (1,282)
Net Unrealized Gains (Losses) On Investments Excluding Credit Losses | Policyholders’ Liabilities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities    
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]    
End of year 33 4
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    
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]    
End of year 98 268
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]    
End of year (7,840) (1,010)
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]    
End of year (7) (5)
Net Unrealized Gains (Losses) On Investments Including Credit Losses | Policyholders’ Liabilities | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Fixed maturities    
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]    
End of year 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    
Debt Securities, Available-for-sale, Net Unrealized Investments [Roll Forward]    
End of year 1 1
Net Unrealized Gains (Losses) On Investments Including 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]    
End of year $ (6) $ (4)