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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]        
Future policy benefits and other policyholders' liabilities   $ 16,738 $ 16,603  
Market risk benefits   (15,061) (15,766)  
DAC   $ 6,419 $ 6,369 $ 5,607
Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits and other policyholders' liabilities $ (1,313)      
Market risk benefits (4,300)      
DAC 1,548     $ 1,409
Unearned revenue liability and sales inducement assets (166)      
Total transition adjustment before taxes (4,231)      
Income taxes 888      
Total transition adjustment (net of taxes) (3,343)      
Retained Earnings | Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits and other policyholders' liabilities 30      
Market risk benefits (3,398)      
DAC 0      
Unearned revenue liability and sales inducement assets 0      
Total transition adjustment before taxes (3,368)      
Income taxes 707      
Total transition adjustment (net of taxes) (2,661)      
Accumulated Other Comprehensive Income (Loss) | Effect of Modified Retrospective Application Accounting Standards Update 2018-12        
Liability for Future Policy Benefit, Activity [Line Items]        
Future policy benefits and other policyholders' liabilities (1,343)      
Market risk benefits (902)      
DAC 1,548      
Unearned revenue liability and sales inducement assets (166)      
Total transition adjustment before taxes (863)      
Income taxes 181      
Total transition adjustment (net of taxes) $ (682)