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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Ceded Credit Risk [Line Items]    
Reinsurance recoverables $ 17,660 $ 17,748
Athene Holding Ltd. [Member] | Athene Holding Ltd. [Member]    
Ceded Credit Risk [Line Items]    
Reserves associated with modified coinsurance reinsurance arrangements 237  
Letter of credit 219  
Athene Holding Ltd. [Member] | AFS Securities [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 5,100  
Athene Holding Ltd. [Member] | Trading Securities [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 1,900  
Athene Holding Ltd. [Member] | Equity Securities [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 49  
Athene Holding Ltd. [Member] | Commercial Mortgage Loans [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 186  
Athene Holding Ltd. [Member] | Derivative Instruments [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 120  
Athene Holding Ltd. [Member] | Other Investments [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets 85  
Athene Holding Ltd. [Member] | Cash [Member]    
Ceded Credit Risk [Line Items]    
Deposit assets $ 78