Cash Flow Information (Tables)	12 Months Ended
Cash Flow Information (Tables)	Dec. 31, 2019
Cash Flow Information [Abstract]
Cash Flow Information	Note 21—Cash Flow Information Millions of Dollars 2019 2018 2017 Noncash Investing Activities Increase (decrease) in PP&E related to an increase (decrease) in asset retirement obligations $ 205 395 (37) Increase (decrease) in assets and liabilities acquired in a nonmonetary exchange* Accounts receivable - (44) - Inventories - 42 - Investments and long-term receivables - 15 - PP&E - 1,907 - Other long-term assets - (9) - Accounts payable - 7 - Accrued income and other taxes - 40 - Cash Payments Interest $ 810 772 1,163 Income taxes 2,905 2,976 1,168 Net Sales (Purchases) of Investments Short-term investments purchased $ (4,902) (1,953) (6,617) Short-term investments sold 2,138 3,573 4,827 Investments and long-term receivables purchased (146) - - $ (2,910) 1,620 (1,790) *See Note 5—Asset Acquisitions and Dispositions.