Quarterly report pursuant to Section 13 or 15(d)

Debt (Senior Notes) (Details)

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Debt (Senior Notes) (Details) - USD ($)
1 Months Ended
Jun. 30, 2016
Sep. 30, 2016
Mar. 24, 2016
Mar. 23, 2016
Feb. 29, 2016
Apr. 30, 2014
Health Net, Inc.            
Debt Instrument [Line Items]            
Long term debt     $ 418,000,000      
LIBOR plus 4.22%, Interest Rate Swap            
Debt Instrument [Line Items]            
Derivative, notional amount         $ 600,000,000  
Variable rate of swap (percent)         4.22%  
LIBOR plus 4.44%, Interest Rate Swap            
Debt Instrument [Line Items]            
Derivative, notional amount         $ 1,000,000,000  
Variable rate of swap (percent)         4.44%  
Revolving credit agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity     1,000,000,000 $ 500,000,000    
Senior Notes | Health Net, Inc.            
Debt Instrument [Line Items]            
Long term debt     418,000,000      
Senior Notes | $1,400 million 5.625% Senior notes, due February 15, 2021            
Debt Instrument [Line Items]            
Debt, face amount   $ 1,400,000,000     $ 1,400,000,000  
Interest rate, stated   5.625%     5.625%  
Senior Notes | $1,000 million 6.125% Senior notes, due February 15, 2024            
Debt Instrument [Line Items]            
Debt, face amount   $ 1,000,000,000     $ 1,000,000,000  
Interest rate, stated   6.125%     6.125%  
Senior Notes | $400 million 6.375% Senior notes, due June 1, 2017            
Debt Instrument [Line Items]            
Debt, face amount   $ 400,000,000 $ 400,000,000      
Interest rate, stated   6.375% 6.375%      
Senior Notes | $1,000 million 4.75% Senior notes, due May 15, 2022            
Debt Instrument [Line Items]            
Debt, face amount   $ 1,000,000,000       $ 500,000,000
Interest rate, stated 4.75% 4.75%       4.75%
Effective yield on add-on notes (percent) 4.41%          
Add-on notes, face amount $ 500,000,000          
Senior Notes | $425 million 5.75% Senior notes, due June 1, 2017            
Debt Instrument [Line Items]            
Debt, face amount   $ 425,000,000        
Interest rate, stated   5.75%