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Other Financial Information	12 Months Ended
Other Financial Information	Dec. 31, 2020
Other Financial Information [Abstract]
Other Financial Information	Note 21—Other Financial Information Millions of Dollars 2020 2019 2018 Interest and Debt Expense Incurred Debt $ 788 799 838 Other 73 36 67 861 835 905 Capitalized (55) (57) (170) Expensed $ 806 778 735 Other Income (Loss) Interest income $ 100 166 97 Unrealized gains (losses) on Cenovus Energy common shares* (855) 649 (437) Other, net 246 543 513 $ (509) 1,358 173 See Note 6—Investment in Cenovus Energy, for additional information. Research and Development Expenditures —expensed $ 75 82 78 Shipping and Handling Costs $ 857 1,008 1,075 Foreign Currency Transaction (Gains) Losses —after-tax Alaska $ - - - Lower 48 - - - Canada (7) 5 (11) Europe, Middle East and North Africa (15) - (26) Asia Pacific (11) 31 3 Other International 2 1 - Corporate and Other (31) 21 21 $ (62) 58 (13) Millions of Dollars 2020 2019 Properties, Plants and Equipment Proved properties $ 94,312 88,284 Unproved properties 4,141 3,980 * Other 3,653 5,482 Gross properties, plants and equipment 102,106 97,746 Less: Accumulated depreciation, depletion and amortization (62,213) (55,477) * Net properties, plants and equipment $ 39,893 42,269 *Excludes assets classified as held for sale at December 31, 2019. See Note 4 — Asset Acquisitions and Dispositions, for additional information.