Cash Flow Information (Tables)	12 Months Ended
Cash Flow Information (Tables)	Dec. 31, 2021
Cash Flow Information [Abstract]
Cash Flow Information	Millions of Dollars 2021 2020 2019 Noncash Investing Activities Increase (decrease) in PP&E related to an increase (decrease) in asset retirement obligations $ 442 (116) 205 Cash Payments Interest $ 924 785 810 Income taxes 856 905 2,905 Net Sales (Purchases) of Investments Short-term investments purchased $ (5,554) (12,435) (4,902) Short-term investments sold 8,810 12,015 2,138 Investments and long-term receivables purchased (279) (325) (146) Investments and long-term receivables sold 114 87 - $ 3,091 (658) (2,910)