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SIGNIFICANT ACCOUNTING POLICIES - Schedule of Balance of and Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   $ 8,470
Less: Reinsurance recoverable   (1,896)
Net liability for future policy benefits, after reinsurance recoverable   6,574
As Previously 
Reported    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   7,341
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
Protection Solutions | Term    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   1,983
Less: Reinsurance recoverable   (59)
Net liability for future policy benefits, after reinsurance recoverable   1,924
Protection Solutions | Term | As Previously 
Reported    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   1,423
Protection Solutions | Term | 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
Protection Solutions | Term | 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
Individual Retirement | Payout - Legacy    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   3,407
Less: Reinsurance recoverable   0
Net liability for future policy benefits, after reinsurance recoverable   3,407
Individual Retirement | Payout - Legacy | As Previously 
Reported    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   3,047
Individual Retirement | Payout - Legacy | 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)
Individual Retirement | Payout - Legacy | 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
Corporate & 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)  
Corporate & Other | Group Pension    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   780
Less: Reinsurance recoverable   0
Net liability for future policy benefits, after reinsurance recoverable   780
Corporate & Other | Group Pension | As Previously 
Reported    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   771
Corporate & Other | Group Pension | 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)
Corporate & Other | Group Pension | 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
Corporate & Other | Health    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   2,300
Less: Reinsurance recoverable   (1,837)
Net liability for future policy benefits, after reinsurance recoverable   463
Corporate & Other | Health | As Previously 
Reported    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for future policy benefits   2,100
Corporate & Other | Health | 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)
Corporate & Other | Health | 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
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)