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Segment Information - Schedule of Operating Segment Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments (in segment) | Segment 3    
Revenues $ 17,782 $ 14,178 $ 9,667
Gross margin 1,672 1,507 1,000
Depreciation and amortization 182 126 134
Goodwill and intangible assets, net 760 641 361
Total assets 7,449 6,576 4,435
Health Plans      
Segment Reporting Information [Line Items]      
Revenues 17,234 13,917 9,449
Gross margin 1,618 1,447 947
Depreciation and amortization 122 95 83
Goodwill and intangible assets, net 513 393 286
Total assets 5,897 4,707 3,355
Molina Medicaid Solutions      
Segment Reporting Information [Line Items]      
Revenues 195 195 210
Gross margin 21 55 53
Depreciation and amortization 45 25 46
Goodwill and intangible assets, net 72 73 75
Total assets 267 213 185
Other      
Segment Reporting Information [Line Items]      
Revenues 353 66 8
Gross margin 33 5 0
Depreciation and amortization 15 6 5
Goodwill and intangible assets, net 175 175 0
Total assets $ 1,285 $ 1,656 $ 895