| Component: (Network and Table) | |
|---|---|
| Network | 2417402 - Disclosure - Receivables (Details) (http://www.cstbrands.com/role/ReceivablesDetails) |
| Table | (Implied) |
| Reporting Entity [Axis] | 0001538849 (http://www.sec.gov/CIK) |
| Receivables [Abstract] | Period [Axis] | ||
|---|---|---|---|
2016-01-01 - 2016-12-31 | 2015-01-01 - 2015-12-31 | 2014-01-01 - 2014-12-31 | |
Receivables [Abstract] | |||
Balance as of the beginning of year | |||
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) | |||
Allowance for Doubtful Accounts Receivable, Write-offs | ( | ( | |
Balance as of the end of year | 1,090,000 | 754,000 | |