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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2020
Ceded Credit Risk [Line Items]        
Reinsurance ACL and deposit assets       $ 192
Maximum retention per single insured life on fixed and VUL insurance contracts $ 20      
Percent of mortality risk reinsured on newly issued non-term life insurance contracts 17.00%      
Reinsurance recoverables $ 16,496 $ 17,144    
Funds withheld reinsurance liabilities 1,946 1,810    
Swiss Re [Member]        
Ceded Credit Risk [Line Items]        
Reinsurance receivable 1,200 1,300    
Trust funded to support reinsurance receivable 1,200      
Funds withheld reinsurance liabilities 151      
Liabilities for reinsurance related embedded derivatives 35      
Protective [Member]        
Ceded Credit Risk [Line Items]        
Reinsurance recoverables 11,300 11,800    
Trust funded to support reinsurance receivable 15,200 14,700    
Athene Holding Ltd. [Member]        
Ceded Credit Risk [Line Items]        
Amount of amortization, after-tax, of deferred gain on business sold 29 30 $ 8  
Deposit assets 5,800 6,600    
Reserves associated with modified coinsurance reinsurance arrangements 6,144 $ 6,897    
Letter of credit 170      
Athene Holding Ltd. [Member] | Over-Collateralization [Member]        
Ceded Credit Risk [Line Items]        
Reserves associated with modified coinsurance reinsurance arrangements $ 185