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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reinsurance Disclosures [Abstract]      
Deposit assets in premiums, reinsurance, and other receivables or secondary guarantee risk for reinsurance $ 2,000 $ 1,400  
Deposit liabilities in other liabilities for reinsurance 2,400 1,400  
Ceded Credit Risk [Line Items]      
Reinsurance recoverables 13,500 12,300  
Other assets 464 509  
Other invested assets, at estimated fair value 3,224 3,037  
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net 4,809 5,086 $ 5,623
Other liabilities 4,484 3,455  
Income (loss) before provision for income tax (1,146) 1,121 $ (1,621)
Five Largest Ceded Reinsurers [Member]      
Ceded Credit Risk [Line Items]      
Five largest reinsurers, reinsurance recoverables amount $ 11,700 $ 10,900  
Five largest reinsurers, reinsurance recoverables percentage 87.00% 89.00%  
Ceded Credit Risk, Secured [Member] | Accident & health insurance      
Ceded Credit Risk [Line Items]      
Reinsurance recoverables $ 6,700    
Ceded Credit Risk, Unsecured [Member]      
Ceded Credit Risk [Line Items]      
Reinsurance recoverables 5,400 $ 5,000  
Ceded Credit Risk, Unsecured [Member] | Five Largest Ceded Reinsurers [Member]      
Ceded Credit Risk [Line Items]      
Five largest reinsurers, reinsurance recoverables amount 4,000 $ 3,800  
Mortality Risk [Member]      
Reinsurance Retention Policy [Line Items]      
Retention amount $ 2    
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    
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%