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Acquisition (Narrative) (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]            
Cash received from sale       $ 423    
Acquisition related costs   $ 44   50    
Revenues   4,020 $ 3,577 7,629 $ 7,077  
Net income (loss)   $ 385 $ 411 752 $ 846  
Reinsurance ceded       $ 18,000   $ 4,900
Liberty Transaction [Member]            
Business Acquisition [Line Items]            
Acquisition agreement date       May 01, 2018    
Capital stock acquired, percent 100.00% 100.00%   100.00%    
Excess capital in LLAC (extraordinary dividend)       $ 1,800    
Cash       $ 1,500    
Revenues $ 373          
Net income (loss) $ 12