Related Party Transactions (Tables) |
6 Months Ended |
|---|---|
Jun. 30, 2021 | |
| Related Party Transactions [Abstract] | |
| Significant Transactions with Related Parties | Millions of Dollars Three Months Ended Six Months Ended June 30 June 30 2021 2020 2021 2020 Operating revenues and other income $ 24 21 40 38 Purchases 3 - 3 - Operating expenses and selling, general and administrative expenses 63 12 89 27 Net interest (income) expense* - (2) (1) (4) *We paid interest to, or received interest from, |