Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Redeemable Noncontrolling Interest Acquisitions and Redeemable Noncontrolling Interest (Details)

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Acquisitions and Redeemable Noncontrolling Interest Acquisitions and Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May. 31, 2015
Jan. 31, 2015
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]            
Payment of contingent consideration obligation       $ 8 $ 0  
Gain on settlement of contingent consideration       (10) $ 0  
Goodwill       $ 811   $ 754
LiveHealthier, Inc. [Member]            
Business Acquisition [Line Items]            
Fair value of contingent consideration   $ 4        
Percentage of acquisition   79.00%        
Consideration transferred   $ 28        
Total percentage of ownership after the acquisition   100.00%        
Payments to acquire business   $ 11        
Common stock issued for acquisition   $ 13        
Contingent consideration, period of payout   3 years        
Maximum contingent consideration   $ 9        
Goodwill   26        
Intangibles acquired   $ 15        
Celtic Insurance Company [Member]            
Business Acquisition [Line Items]            
Ownership percentage sold by parent, percentage   25.00%        
Proceeds from divestiture of businesses   $ 7        
Community Health Solutions [Member]            
Business Acquisition [Line Items]            
Fair value of contingent consideration           $ 18
Payment of contingent consideration obligation     $ 8      
Gain on settlement of contingent consideration     $ (10)      
Fidelis [Member]            
Business Acquisition [Line Items]            
Fair value of contingent consideration $ 34          
Percentage of acquisition 100.00%          
Consideration transferred $ 57          
Payments to acquire business 7          
Goodwill 28          
Intangibles acquired $ 24          
Goodwill deductible for income tax , percentage 100.00%          
Liabilities incurred $ 16          
Description of contingent consideration arrangement duals membership and revenue per member during the first year of the contract, including reconciliation payments