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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reinsurance Disclosures [Abstract]      
Deposit assets in premiums, reinsurance, and other receivables or secondary guarantee risk for reinsurance $ 1,400.0 $ 1,500.0  
Deposit liabilities in other liabilities for reinsurance 198.0 1.0  
Ceded Credit Risk [Line Items]      
Reinsurance recoverables 9,100.0 9,100.0  
Reinsurance Recoverables, Allowance 0.0 0.0  
Future policy benefits 35,715.0 32,752.0  
Other assets 547.0 689.0  
Other invested assets, at estimated fair value 2,448.0 5,029.0  
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net 5,623.0 6,339.0 $ 5,777.0
Other Liabilities 4,419.0 5,445.0  
Income (loss) before provision for income tax $ (1,621.0) (4,465.0) $ 1,165.0
PWL [Member]      
Ceded Credit Risk [Line Items]      
Percentage Of Participating Whole Life Insurance Policies 90.00%    
Future policy benefits $ 654.0    
Other invested assets, at estimated fair value 713.0    
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net 95.0    
Other Liabilities 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 $ 7,900.0 $ 7,800.0  
Five largest reinsurers, reinsurance recoverables percentage 87.00% 86.00%  
Ceded Credit Risk, Secured [Member] | Accident & health insurance      
Ceded Credit Risk [Line Items]      
Reinsurance recoverables $ 6,500.0    
Ceded Credit Risk, Unsecured [Member]      
Ceded Credit Risk [Line Items]      
Reinsurance recoverables 2,400.0 $ 2,600.0  
Ceded Credit Risk, Unsecured [Member] | Five Largest Ceded Reinsurers [Member]      
Ceded Credit Risk [Line Items]      
Five largest reinsurers, reinsurance recoverables amount 1,400.0 $ 1,500.0  
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%