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Segment Information - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Total gross margin                 $ 1,672 $ 1,507 $ 1,000
Other operating revenues                 17,782 14,178 9,667
Other operating expenses                 17,476 13,791 9,474
Operating income $ (6) $ 118 $ 105 $ 89 $ 76 $ 113 $ 116 $ 82 306 387 193
Other expenses, net                 101 65 58
Income before income tax expense                 205 322 135
Health Plans                      
Segment Reporting Information [Line Items]                      
Total gross margin                 1,618 1,447 947
Other operating revenues                 17,234 13,917 9,449
Molina Medicaid Solutions                      
Segment Reporting Information [Line Items]                      
Total gross margin                 21 55 53
Other operating revenues                 195 195 210
Other                      
Segment Reporting Information [Line Items]                      
Total gross margin                 33 5 0
Other operating revenues                 353 66 8
Operating Segments                      
Segment Reporting Information [Line Items]                      
Total gross margin                 1,672 1,507 1,000
Operating Segments | Health Plans                      
Segment Reporting Information [Line Items]                      
Total gross margin                 1,618 1,447 947
Operating Segments | Molina Medicaid Solutions                      
Segment Reporting Information [Line Items]                      
Total gross margin                 21 55 53
Operating Segments | Other                      
Segment Reporting Information [Line Items]                      
Total gross margin                 33 5 0
Other Operating                      
Segment Reporting Information [Line Items]                      
Other operating revenues                 851 684 434
Other operating expenses                 $ (2,217) $ (1,804) $ (1,241)