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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Balance of and Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Liability for Future Policy Benefit, Activity [Line Items]    
Less: Reinsurance Recoverable   $ (1,896)
Net liability for future policy benefits, after reinsurance recoverable   6,574
Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   (356)
Effect of Remeasurement of Liability at Current Single A Rate    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   1,485
Corporate and Other | No Effect Of Application Of Accounting Standards Update 2018-12    
Liability for Future Policy Benefit, Activity [Line Items]    
Net liability for future policy benefits, after reinsurance recoverable $ (111)  
Protection Solutions PFBL | No Effect Of Application Of Accounting Standards Update 2018-12    
Liability for Future Policy Benefit, Activity [Line Items]    
Net liability for future policy benefits, after reinsurance recoverable 550  
PDR | No Effect Of Application Of Accounting Standards Update 2018-12    
Liability for Future Policy Benefit, Activity [Line Items]    
Net liability for future policy benefits, after reinsurance recoverable (230)  
Rider Reserves and Term Reinsurance | No Effect Of Application Of Accounting Standards Update 2018-12    
Liability for Future Policy Benefit, Activity [Line Items]    
Net liability for future policy benefits, after reinsurance recoverable $ (24)  
Term | Protection Solutions    
Liability for Future Policy Benefit, Activity [Line Items]    
Less: Reinsurance Recoverable   (59)
Net liability for future policy benefits, after reinsurance recoverable   1,924
Term | Protection Solutions | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   0
Term | Protection Solutions | Effect of Remeasurement of Liability at Current Single A Rate    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   560
Payout - Legacy | Individual Retirement    
Liability for Future Policy Benefit, Activity [Line Items]    
Less: Reinsurance Recoverable   0
Net liability for future policy benefits, after reinsurance recoverable   3,407
Payout - Legacy | Individual Retirement | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   (171)
Payout - Legacy | Individual Retirement | Effect of Remeasurement of Liability at Current Single A Rate    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   531
Group Pension | Corporate and Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Less: Reinsurance Recoverable   0
Net liability for future policy benefits, after reinsurance recoverable   780
Group Pension | Corporate and Other | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   (85)
Group Pension | Corporate and Other | Effect of Remeasurement of Liability at Current Single A Rate    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   94
Health | Corporate and Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Less: Reinsurance Recoverable   (1,837)
Net liability for future policy benefits, after reinsurance recoverable   463
Health | Corporate and Other | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   (100)
Health | Corporate and Other | Effect of Remeasurement of Liability at Current Single A Rate    
Liability for Future Policy Benefit, Activity [Line Items]    
Effect of changes in cash flow assumptions   $ 300