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Other Financial Information	12 Months Ended
Other Financial Information	Dec. 31, 2021
Other Financial Information [Abstract]
Other Financial Information	Note 20—Other Financial Information Millions of Dollars 2021 2020 2019 Interest and Debt Expense Incurred Debt $ 887 788 799 Other 59 73 36 946 861 835 Capitalized (62) (55) (57) Expensed $ 884 806 778 Other Income (Loss) Interest income $ 33 100 166 Gain (loss) on investment in Cenovus Energy* 1,040 (855) 649 Other, net 130 246 543 $ 1,203 (509) 1,358 See Note 5. Research and Development Expenditures —expensed $ 62 75 82 Shipping and Handling Costs $ 1,047 857 1,008 Foreign Currency Transaction (Gains) Losses —after-tax Alaska $ - - - Lower 48 - - - Canada (1) (7) 5 Europe, Middle East and North Africa (11) (15) - Asia Pacific 2 (11) 31 Other International 1 2 1 Corporate and Other (7) (31) 21 $ (16) (62) 58 Millions of Dollars 2021 2020 Properties, Plants and Equipment Proved properties $ 114,274 ** 94,312 Unproved properties* 10,993 4,141 Other 4,379 3,653 Gross properties, plants and equipment 129,646 102,106 Less: Accumulated depreciation, depletion and amortization (64,735) ** (62,213) Net properties, plants and equipment $ 64,911 39,893 Proved and Unproved properties increased by $ 20.0 billion and $ 6.9 billion, respectively, in 2021 compared with 2020, primarily due to the Concho and Shell Permian acquisitions. *Excludes assets classified as held for sale at December 31, 2021. See Note 3.