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General - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 01, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Accounting transactions          
Equity securities       $ 308  
Limited partnership interests   $ 3,452   3,147  
Accounting Standards Update 2016-01          
Accounting transactions          
Equity securities       308  
Equity method limited partnerships          
Accounting transactions          
Limited partnership interests   2,710   2,540  
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          
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