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Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Summary of accounts receivable    
Total receivables $ 871 $ 974
Health Plans    
Summary of accounts receivable    
Total receivables 797 887
Molina Medicaid Solutions    
Summary of accounts receivable    
Total receivables 30 34
Other    
Summary of accounts receivable    
Total receivables 44 53
California | Health Plans    
Summary of accounts receivable    
Total receivables 208 180
Florida | Health Plans    
Summary of accounts receivable    
Total receivables 42 97
Illinois | Health Plans    
Summary of accounts receivable    
Total receivables 91 134
Michigan | Health Plans    
Summary of accounts receivable    
Total receivables 56 60
New Mexico | Health Plans    
Summary of accounts receivable    
Total receivables 71 57
New York | Health Plans    
Summary of accounts receivable    
Total receivables 21 26
Ohio | Health Plans    
Summary of accounts receivable    
Total receivables 94 82
Puerto Rico | Health Plans    
Summary of accounts receivable    
Total receivables 32 37
South Carolina | Health Plans    
Summary of accounts receivable    
Total receivables 13 11
Texas | Health Plans    
Summary of accounts receivable    
Total receivables 61 79
Utah | Health Plans    
Summary of accounts receivable    
Total receivables 18 19
Washington | Health Plans    
Summary of accounts receivable    
Total receivables 69 71
Wisconsin | Health Plans    
Summary of accounts receivable    
Total receivables 19 33
Other | Health Plans    
Summary of accounts receivable    
Total receivables $ 2 $ 1