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Segments - Schedule of Operating Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Balance Sheet [Abstract]          
Cash and cash equivalents $ 3,392 $ 2,979 $ 3,392 $ 2,979 $ 3,186
Total assets held for sale 230   230   0
Total liabilities 66   66   $ 0
Income Statement [Abstract]          
Total revenue 4,883 4,999 9,529 9,903  
Health Plans          
Income Statement [Abstract]          
Total revenue 4,752 4,868 9,261 9,639  
Molina Medicaid Solutions          
Balance Sheet [Abstract]          
Cash and cash equivalents 9   9    
Receivables and prepaid expenses 41   41    
Goodwill and property, equipment, and capitalized software, net 70   70    
Deferred contract costs and other assets 110   110    
Total assets held for sale 230   230    
Accounts payable and accrued and other liabilities 27   27    
Deferred revenue 39   39    
Total liabilities 66   66    
Income Statement [Abstract]          
Total revenue 48 47 99 93  
Other          
Income Statement [Abstract]          
Total revenue $ 83 $ 84 $ 169 $ 171