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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Disclosures [Abstract]        
Deposit assets in premiums, reinsurance, and other receivables or secondary guarantee risk for reinsurance   $ 1,400.0 $ 1,400.0  
Deposit liabilities in other liabilities for reinsurance   1,400.0 445.0  
Ceded Credit Risk [Line Items]        
Reinsurance recoverables   12,300.0 9,100.0  
Reinsurance Recoverables, Allowance   0.0 0.0  
Future policy benefits   35,588.0 35,715.0  
Other assets   509.0 547.0  
Other invested assets, at estimated fair value   3,037.0 2,519.0  
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net $ 6,339.0 5,086.0 5,623.0 $ 6,339.0
Other liabilities   3,455.0 4,419.0  
Income (loss) before provision for income tax   1,121.0 (1,621.0) $ (4,465.0)
PWL [Member]        
Ceded Credit Risk [Line Items]        
Percentage Of Participating Whole Life Insurance Policies 90.00%     90.00%
Future policy benefits $ (654.0)     $ (654.0)
Other invested assets, at estimated fair value (713.0)     (713.0)
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net (95.0)     (95.0)
Other liabilities (43.0)     $ (43.0)
Income (loss) before provision for income tax $ (72.0)      
Five Largest Ceded Reinsurers [Member]        
Ceded Credit Risk [Line Items]        
Five largest reinsurers, reinsurance recoverables amount   $ 10,900.0 $ 7,900.0  
Five largest reinsurers, reinsurance recoverables percentage   89.00% 87.00%  
Ceded Credit Risk, Secured [Member] | Accident & health insurance        
Ceded Credit Risk [Line Items]        
Reinsurance recoverables   $ 6,600.0    
Ceded Credit Risk, Unsecured [Member]        
Ceded Credit Risk [Line Items]        
Reinsurance recoverables   5,000.0 $ 2,400.0  
Ceded Credit Risk, Unsecured [Member] | Five Largest Ceded Reinsurers [Member]        
Ceded Credit Risk [Line Items]        
Five largest reinsurers, reinsurance recoverables amount   3,800.0 $ 1,400.0  
Mortality Risk [Member]        
Reinsurance Retention Policy [Line Items]        
Retention amount   $ 2.0    
Reinsurance Retention Policy, Excess Retention, Percentage   90.00%    
Mortality Risk on Case by Case Basis [Member]        
Reinsurance Retention Policy [Line Items]        
Reinsured risk percentage   90.00%    
Retention amount   $ 20.0    
Reinsurance Retention Policy, Excess Retention, Percentage   100.00%    
Quota Share Reinsurance for Certain Disability Business [Member]        
Reinsurance Retention Policy [Line Items]        
Reinsured risk percentage   100.00%    
Living And Death Benefit Guarantees [Member]        
Reinsurance Retention Policy [Line Items]        
Reinsured risk percentage   100.00%