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Summary of Significant Accounting Policies - Significant Customers (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
California |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of revenues under contracts or subcontracts | 13.00% | 18.00% | 21.00%
Texas |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of revenues under contracts or subcontracts | 10.00% | 12.00% | 13.00%

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- Definition Percentage of revenues under contracts or subcontracts. + References No definition available. + Details
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Namespace Prefix: | cnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_TX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |