Commitments and Contingencies - Employees Under Collective Bargaining Agreements Narrative (Details) |
Dec. 31, 2019
numberOfEmployees
|
|---|---|
| Other Commitments [Line Items] | |
| Entity number of employees | 91,000 |
| Percentage of employees represented by unions under collective bargaining agreements | 19.00% |
| Monroe refinery employees represented by United Steel Workers | |
| Other Commitments [Line Items] | |
| Entity number of employees | 199 |