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SIGNIFICANT ACCOUNTING POLICIES - Assumption Updates (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Change in Accounting Estimate [Line Items]        
Policy charges and fee income $ (2,454) $ (2,768) $ (3,735)  
Policyholders’ benefits 2,716 2,788 5,326  
Change in market risk benefits and purchased market risk benefits (1,280) (5,943) 0  
Net derivative gains (losses) 907 (7,149) (1,722)  
Amortization of deferred policy acquisition costs, net     (1,613)  
Income (loss) from continuing operation, before income taxes 2,992 2,609 (1,093)  
Net income (loss) 2,394 2,170 (349)  
5-year Historical Average Over A 10-year Period        
Change in Accounting Estimate [Line Items]        
Interest rate assumptions       2.25%
Long-term Lapses, Partial Withdrawal Rates and Election Assumptions Updates        
Change in Accounting Estimate [Line Items]        
Policy charges and fee income (14) (33) (23)  
Policyholders’ benefits (13) 11 (1,600)  
Change in market risk benefits and purchased market risk benefits (204) 446    
Increased interest credited (1) (1) 1  
Income (loss) from continuing operations, before income taxes (206)      
Net derivative gains (losses)     112  
Amortization of deferred policy acquisition costs, net   1 1,100  
Income (loss) from continuing operation, before income taxes   400 (2,600)  
Net income (loss) $ (163) $ 316 (2,000)  
Economic Scenario Generator        
Change in Accounting Estimate [Line Items]        
Income (loss) from continuing operation, before income taxes     201  
Net income (loss)     $ 159