Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ in Millions
1 Months Ended
Mar. 24, 2016
Jan. 31, 2016
Business Acquisition [Line Items]    
Percentage of acquisition   19.00%
New stock issued (in shares)   1,144,462
Health Net, Inc.    
Business Acquisition [Line Items]    
Common stock issued for acquisitions (in shares) 48,449,444  
Common stock issued for acquisition $ 3,038  
Payments to acquire business 2,247  
Fair value adjustment to stock based compensation $ 2