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INVESTMENT OPERATIONS - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
unrealized_loss_position
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months $ 71 $ 76
Total positions that were in an unrealized loss position | unrealized_loss_position 845  
Total positions that were in an unrealized loss position having allowance for credit loss established | unrealized_loss_position 6  
Fixed maturity securities - AFS $ 67,710 70,119
Available-for-sale, amortized cost 64,222 63,220
Fixed maturity securities 2,833 2,958
Below investment grade    
Schedule of Investments [Line Items]    
Fixed maturity securities - AFS 3,000  
Available-for-sale, amortized cost 3,000  
Securities not publicly traded 508  
Fixed maturity securities 134  
Commercial mortgage-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 2 4
Fixed maturity securities - AFS 2,425 2,534
Available-for-sale, amortized cost 2,346 2,429
Fixed maturity securities 213 214
Other asset-backed securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months $ 1 5
Underlying collateral percentage 9700.00%  
Fixed maturity securities - AFS $ 1,536 1,578
Available-for-sale, amortized cost 1,505 1,546
Fixed maturity securities 175 163
Corporate securities    
Schedule of Investments [Line Items]    
Unrealized loss, greater than 12 months 68 66
Fixed maturity securities - AFS 50,357 52,107
Available-for-sale, amortized cost 47,342 46,150
Fixed maturity securities 1,772 $ 1,860
Corporate securities | Below investment grade    
Schedule of Investments [Line Items]    
Unrealized losses, greater than twelve months, credit related $ 1