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SIGNIFICANT ACCOUNTING POLICIES - Effect of Transition Adjustment to Total Equity Resulting (Details) - USD ($)
$ in Millions
Jan. 01, 2021
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for future policy benefits   $ (16,033) $ (15,935)  
Liability for market risk benefits   (15,047) (15,751)  
DAC   $ 4,817 $ 4,814 $ 4,098
Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for future policy benefits $ (821)      
Liability for market risk benefits (4,306)      
DAC 467     $ 327
Unearned revenue liability and sales inducement assets (128)      
Total transition adjustment before taxes (4,788)      
Income taxes 1,006      
Total adjustment (net of taxes) (3,782)      
Accumulated Deficit | Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for future policy benefits (2)      
Liability for market risk benefits (3,402)      
DAC 0      
Unearned revenue liability and sales inducement assets 0      
Total transition adjustment before taxes (3,404)      
Income taxes 715      
Total adjustment (net of taxes) (2,689)      
Accumulated Other Comprehensive Income (Loss) | Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Liability for Future Policy Benefit, Activity [Line Items]        
Liability for future policy benefits (819)      
Liability for market risk benefits (904)      
DAC 467      
Unearned revenue liability and sales inducement assets (128)      
Total transition adjustment before taxes (1,384)      
Income taxes 291      
Total adjustment (net of taxes) $ (1,093)