Quarterly report pursuant to Section 13 or 15(d)

Health Net (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details)

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Health Net (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 24, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]            
Goodwill   $ 4,730   $ 4,730   $ 842
Health Net, Inc.            
Business Acquisition [Line Items]            
Cash and cash equivalents $ 1,401          
Premium and related receivables 1,258          
Short term investments 74          
Other current assets 448          
Long term investments 2,037          
Restricted deposits 30          
Property, software and equipment, net 41          
Intangible assets, net 1,500          
Other long term assets 136          
Total assets acquired 6,925          
Medical claims liability 1,453          
Borrowings under revolving credit facility 285          
Accounts payable and accrued expenses 2,033          
Return of premium payable 435          
Unearned revenue 130          
Long term deferred tax liabilities 330          
Long term debt 418          
Other long term liabilities 430          
Total liabilities assumed 5,514          
Total identifiable net assets 1,411          
Goodwill 3,876          
Total assets acquired and liabilities assumed 5,287          
Fair value of the risk corridor receivable $ 9          
Weighted average life of intangibles 10 years          
Premium deficiency reserves $ 285 15   15    
Deferred tax assets 526          
Revenue of acquiree since acquisition date, actual   $ 3,981   8,604    
Unaudited pro forma total revenues     $ 9,960 $ 32,369 $ 28,617  
Health Net, Inc. | Senior Notes            
Business Acquisition [Line Items]            
Long term debt 418          
Face amount of senior notes 400          
Unamortized premium $ 18