Sales and Other Operating Revenue - Practical Expedients (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2019 | |
| Revenue, Practical Expedient [Abstract] | |
| Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true/false] | true |
| Revenue, Practical Expedient, Remaining Performance Obligation, Description | We have long-term commodity sales contracts which use prevailing market prices at the time of delivery, and under these contracts, the market-based variable consideration for each performance obligation (i.e., delivery of commodity) is allocated to each wholly unsatisfied performance obligation within the contract. |