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FUTURE POLICY BENEFITS, POLICY AND CONTRACT CLAIMS AND POLICYHOLDERS' ACCOUNT BALANCES - Schedule of Movement In Insurance Reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Gross reserves        
Gross reserve, beginning of period     $ 8,497  
Gross reserve, ending of period $ 14,410   14,410  
Reinsurance assets        
Reinsurance assets at beginning of period     169  
Reinsurance assets at end of period 576   576  
Future Policy Benefits        
Gross reserves        
Gross reserve, beginning of period 8,512 $ 1,264 8,497 $ 1,339
Acquisition from business combination 5,132   5,132  
New business 1,229 52 1,536 55
Normal changes (405) 6 (756) (94)
Management actions and changes in assumptions 16 1 53 5
Total changes during the year 5,972 59 5,965 (34)
Impact of foreign exchange (74) 16 (52) 34
Gross reserve, ending of period 14,410 1,339 14,410 1,339
Reinsurance assets        
Reinsurance assets at beginning of period 148 178 169 190
Acquisition from business combination 7   7  
New business 0 0 0 0
Normal changes 95 (4) 73 (18)
Management actions and changes in assumptions 0 (1) 0 (2)
Increase (decrease) in reinsurance assets 102 (5) 80 (20)
Impact of foreign exchange (4) 3 (3) 6
Reinsurance assets at end of period 246 176 246 176
Net        
Beginning of period 8,364 1,086 8,328 1,149
Acquisition from business combination 5,125   5,125  
New business 1,229 52 1,536 55
Normal changes (500) 10 (829) (76)
Management actions and changes in assumptions 16 2 53 7
Total changes during the year 5,870 64 5,885 (14)
Impact of foreign exchange (70) 13 (49) 28
Reinsurance Reserve, Net 14,164 1,163 14,164 1,163
Future Policy Benefits | Life        
Gross reserves        
Gross reserve, beginning of period 0 0 0 0
Acquisition from business combination 3,459   3,459  
New business 1 0 1 0
Normal changes (236) 0 (236) 0
Management actions and changes in assumptions 0 0 0 0
Total changes during the year 3,224 0 3,224 0
Impact of foreign exchange 0 0 0 0
Gross reserve, ending of period 3,224 0 3,224 0
Future Policy Benefits | Annuities        
Gross reserves        
Gross reserve, beginning of period 8,512 1,264 8,497 1,339
Acquisition from business combination 1,627   1,627  
New business 1,228 52 1,535 55
Normal changes (169) 6 (520) (94)
Management actions and changes in assumptions 16 1 53 5
Total changes during the year 2,702 59 2,695 (34)
Impact of foreign exchange (74) 16 (52) 34
Gross reserve, ending of period 11,140 1,339 11,140 1,339
Future Policy Benefits | Health        
Gross reserves        
Gross reserve, beginning of period 0 0 0 0
Acquisition from business combination 46   46  
New business 0 0 0 0
Normal changes 0 0 0 0
Management actions and changes in assumptions 0 0 0 0
Total changes during the year 46 0 46 0
Impact of foreign exchange 0 0 0 0
Gross reserve, ending of period 46 $ 0 46 $ 0
Policy and contract claims        
Gross reserves        
Gross reserve, beginning of period 0   0  
Acquisition from business combination 1,706   1,706  
New business 0   0  
Normal changes 12   12  
Management actions and changes in assumptions 16   16  
Total changes during the year 1,734   1,734  
Gross reserve, ending of period 1,734   1,734  
Reinsurance assets        
Reinsurance assets at beginning of period 0   0  
Acquisition from business combination 116   116  
New business 0   0  
Normal changes 211   211  
Management actions and changes in assumptions 3   3  
Increase (decrease) in reinsurance assets 330   330  
Reinsurance assets at end of period 330   330  
Net        
Beginning of period 0   0  
Acquisition from business combination 1,590      
New business 0   0  
Normal changes (199)   (199)  
Management actions and changes in assumptions 13   13  
Total changes during the year 1,404   1,404  
Reinsurance Reserve, Net $ 1,404   $ 1,404