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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Balance of and Changes in Liability for Future Policy Benefits (Details)
$ in Millions
Dec. 31, 2020
USD ($)
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