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INVESTMENTS - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] $ (45)    
(Addition to) release of allowance for credit losses [2] 0 $ 2  
Balance, end of period (125)    
Transitional real estate loans      
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] (22)    
Impact of Restatement on Opening Retained Earnings, before Tax     $ 2
(Addition to) release of allowance for credit losses (3)    
Balance, end of period (27)    
Commercial mortgage loans      
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] (3)    
Impact of Restatement on Opening Retained Earnings, before Tax     8
(Addition to) release of allowance for credit losses 0    
Balance, end of period (11)    
Middle market loans      
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] (20)    
Impact of Restatement on Opening Retained Earnings, before Tax     33
(Addition to) release of allowance for credit losses (34)    
Balance, end of period (87)    
Held-to-maturity securities      
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] 0    
Impact of Restatement on Opening Retained Earnings, before Tax     10
(Addition to) release of allowance for credit losses 1    
Balance, end of period (9)    
Available-for-sale securities      
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] 0    
Impact of Restatement on Opening Retained Earnings, before Tax     0
(Addition to) release of allowance for credit losses (63)    
Balance, end of period (63)    
Reinsurance recoverables      
Allowance for Loan Losses by Portfolio Segment [Roll Forward]      
Balance, beginning of period [1] 0    
Impact of Restatement on Opening Retained Earnings, before Tax     $ 11
(Addition to) release of allowance for credit losses 0    
Balance, end of period $ (11)    
[1] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.

[2] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.