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Contingencies and Other Matters - Legal and Regulatory Matters (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Loss Contingencies [Line Items]          
Total revenues $ 9,960 $ 9,492 $ 19,844 $ 18,959  
Shareholders' net income 510 $ 588 1,029 1,121  
CMS Actions [Member]          
Loss Contingencies [Line Items]          
Costs related to CMS audit response, after-tax     $ 30    
CMS Actions [Member] | Scenario, Forecast [Member]          
Loss Contingencies [Line Items]          
Total revenues        
Shareholders' net income        
Disability Claims Regulatory Matter [Member]          
Loss Contingencies [Line Items]          
Monitoring period     2 years    
Guaranty Fund Assessments [Member]          
Loss Contingencies [Line Items]          
Charges related to guaranty fund assessments      
Pending Litigation [Member]          
Loss Contingencies [Line Items]          
Reserves for litigation matters, pre-tax 190   190    
Reserves for litigation matters, after-tax $ 125   $ 125