Related Party Transactions (Tables) |
9 Months Ended |
|---|---|
Sep. 30, 2021 | |
| Related Party Transactions [Abstract] | |
| Significant Transactions with Related Parties | Millions of Dollars Three Months Ended Nine Months Ended September 30 September 30 Significant Transactions 2021 2020 2021 2020 Operating revenues and other income $ 22 21 63 59 Purchases 1 - 5 - Operating expenses and selling, general expenses 45 16 135 43 Net interest (income) expense* $ - (1) (2) (5) *We paid interest to, . |