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General - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Accounting transactions            
Dividends     $ 100      
Equity securities $ 308          
Tax cuts and jobs act of 2017 change in tax rate income, reduction     $ 53      
Accounting Standards Update 2016-01            
Accounting transactions            
Equity securities 308          
Equity method limited partnerships | Accounting Standards Update 2016-01            
Accounting transactions            
Limited partnership interests 95          
Additional capital paid-in            
Accounting transactions            
Gain on reinsurance transaction with an affiliate       $ 0 $ 34  
Accumulated other comprehensive income            
Accounting transactions            
Cumulative effect of change in accounting principle 238         $ 0
Retained income            
Accounting transactions            
Dividends       $ 100 $ 500  
Cumulative effect of change in accounting principle (314)         $ 0
Retained income | Accounting Standards Update 2016-01            
Accounting transactions            
Cumulative effect of change in accounting principle $ (76)          
AAC | Affiliate            
Accounting transactions            
Proceeds from reinsurance   $ 20        
Deferred policy acquisition costs, additions   45        
Additions to other assets, amount   11        
Reinsurance, reserve for life-contingent contract benefits   24        
Deferred tax liabilities   18        
AAC | Additional capital paid-in | Affiliate            
Accounting transactions            
Gain on reinsurance transaction with an affiliate   $ 34