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Properties, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Properties, Plant and Equipment
Properties, Plant and Equipment1
At December 31Year ended December 31
Gross Investment at CostNet Investment
Additions at Cost2
Depreciation Expense3
202020192018202020192018202020192018202020192018
Upstream
United States$96,555 $82,117 $88,155 $38,175 $31,082 $39,526 $13,067 $7,751 $6,434 $6,841 $15,222 $5,328 
International209,846 206,292 215,329 102,010 102,639 113,603 11,069 3,664 4,865 11,121 12,618 12,726 
Total Upstream306,401 288,409 303,484 140,185 133,721 153,129 24,136 11,415 11,299 17,962 27,840 18,054 
Downstream
United States26,499 25,968 24,685 11,101 11,398 10,838 638 1,452 1,259 851 869 751 
International7,993 7,480 7,237 3,395 3,114 3,023 573 355 278 283 256 282 
Total Downstream34,492 33,448 31,922 14,496 14,512 13,861 1,211 1,807 1,537 1,134 1,125 1,033 
All Other
United States4,195 4,719 4,667 1,916 2,236 2,186 194 324 224 403 243 320 
International144 146 171 21 25 31 5 9 6 9 10 12 
Total All Other4,339 4,865 4,838 1,937 2,261 2,217 199 333 230 412 253 332 
Total United States127,249 112,804 117,507 51,192 44,716 52,550 13,899 9,527 7,917 8,095 16,334 6,399 
Total International217,983 213,918 222,737 105,426 105,778 116,657 11,647 4,028 5,149 11,413 12,884 13,020 
Total$345,232 $326,722 $340,244 $156,618 $150,494 $169,207 $25,546 $13,555 $13,066 $19,508 $29,218 $19,419 
1Other than the United States and Australia, no other country accounted for 10 percent or more of the company’s net properties, plant and equipment (PP&E) in 2020. Australia had PP&E of $48,060, $51,359 and $53,768 in 2020, 2019 and 2018, respectively. Gross Investment at Cost, Net Investment and Additions at Cost for 2020 each include $16,703 associated with the Noble acquisition.
2Net of dry hole expense related to prior years’ expenditures of $709, $49 and $343 in 2020, 2019 and 2018, respectively.
3Depreciation expense includes accretion expense of $560, $628 and $654 in 2020, 2019 and 2018, respectively, and impairments of $2,792, $10,797 and $735 in 2020, 2019 and 2018, respectively.