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Impairment Losses - Goodwill Balances (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Dec. 31, 2016
Goodwill        
Historical goodwill       $ 678,000,000
Accumulated impairment losses     $ (119,000,000) (58,000,000)
Goodwill $ 620,000,000 $ 620,000,000 559,000,000 620,000,000
Goodwill        
Beginning balance 620,000,000      
Impairment loss (61,000,000) 0    
Ending balance 559,000,000 620,000,000    
Health Plans        
Goodwill        
Historical goodwill       445,000,000
Accumulated impairment losses     (58,000,000) (58,000,000)
Goodwill 387,000,000 387,000,000 387,000,000 387,000,000
Goodwill        
Beginning balance 387,000,000      
Impairment loss 0      
Ending balance 387,000,000 387,000,000    
Molina Medicaid Solutions        
Goodwill        
Historical goodwill       71,000,000
Accumulated impairment losses     0 0
Goodwill 71,000,000 71,000,000 71,000,000 71,000,000
Goodwill        
Beginning balance 71,000,000      
Impairment loss 0      
Ending balance 71,000,000 71,000,000    
Other segment        
Goodwill        
Historical goodwill       162,000,000
Accumulated impairment losses     (61,000,000) 0
Goodwill 162,000,000 162,000,000 $ 101,000,000 $ 162,000,000
Goodwill        
Beginning balance 162,000,000      
Impairment loss (61,000,000)      
Ending balance $ 101,000,000 $ 162,000,000