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Properties, Plant and Equipment | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Properties, Plant and Equipment | Properties, Plant and Equipment 1
| At December 31 |  |  | Year ended December 31 |
| Gross Investment at Cost |  |  | Net Investment |  |  | Additions at Cost 2 |  |  | Depreciation Expense 3 |
| 2017 |  | 2016 |  | 2015 |  |  | 2017 |  | 2016 |  | 2015 |  |  | 2017 |  | 2016 |  | 2015 |  |  | 2017 |  | 2016 |  | 2015 |
Upstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | $ | 84,602 |  | $ | 83,929 |  | $ | 93,848 |  |  | $ | 38,722 |  | $ | 39,710 |  | $ | 43,125 |  |  | $ | 4,995 |  | $ | 4,432 |  | $ | 6,586 |  |  | $ | 5,527 |  | $ | 6,576 |  | $ | 8,545 |
International | 224,211 |  | 214,557 |  | 208,395 |  |  | 123,191 |  | 125,502 |  | 127,459 |  |  | 7,934 |  | 12,084 |  | 19,993 |  |  | 12,096 |  | 11,247 |  | 10,803 |
Total Upstream | 308,813 |  | 298,486 |  | 302,243 |  |  | 161,913 |  | 165,212 |  | 170,584 |  |  | 12,929 |  | 16,516 |  | 26,579 |  |  | 17,623 |  | 17,823 |  | 19,348 |
Downstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | 23,598 |  | 22,795 |  | 23,202 |  |  | 10,346 |  | 10,196 |  | 10,807 |  |  | 907 |  | 528 |  | 696 |  |  | 753 |  | 956 |  | 878 |
International | 7,094 |  | 9,350 |  | 9,177 |  |  | 3,074 |  | 4,094 |  | 4,090 |  |  | 306 |  | 375 |  | 365 |  |  | 282 |  | 332 |  | 355 |
Total Downstream | 30,692 |  | 32,145 |  | 32,379 |  |  | 13,420 |  | 14,290 |  | 14,897 |  |  | 1,213 |  | 903 |  | 1,061 |  |  | 1,035 |  | 1,288 |  | 1,233 |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | 4,798 |  | 5,263 |  | 5,500 |  |  | 2,341 |  | 2,635 |  | 2,859 |  |  | 218 |  | 198 |  | 357 |  |  | 677 |  | 328 |  | 439 |
International | 182 |  | 183 |  | 155 |  |  | 38 |  | 49 |  | 56 |  |  | 4 |  | 6 |  | 5 |  |  | 14 |  | 18 |  | 17 |
Total All Other | 4,980 |  | 5,446 |  | 5,655 |  |  | 2,379 |  | 2,684 |  | 2,915 |  |  | 222 |  | 204 |  | 362 |  |  | 691 |  | 346 |  | 456 |
Total United States | 112,998 |  | 111,987 |  | 122,550 |  |  | 51,409 |  | 52,541 |  | 56,791 |  |  | 6,120 |  | 5,158 |  | 7,639 |  |  | 6,957 |  | 7,860 |  | 9,862 |
Total International | 231,487 |  | 224,090 |  | 217,727 |  |  | 126,303 |  | 129,645 |  | 131,605 |  |  | 8,244 |  | 12,465 |  | 20,363 |  |  | 12,392 |  | 11,597 |  | 11,175 |
Total | $ | 344,485 |  | $ | 336,077 |  | $ | 340,277 |  |  | $ | 177,712 |  | $ | 182,186 |  | $ | 188,396 |  |  | $ | 14,364 |  | $ | 17,623 |  | $ | 28,002 |  |  | $ | 19,349 |  | $ | 19,457 |  | $ | 21,037 |
1 | Other than the United States, Australia and Nigeria, no other country accounted for 10 percent or more of the company’s net properties, plant and equipment (PP&E) in 2017. Australia had PP&E of $55,514, $53,962 and $49,205 in 2017, 2016, and 2015, respectively. Nigeria had PP&E of $17,076, $17,922 and $18,773 for 2017, 2016 and 2015, respectively.
2 | Net of dry hole expense related to prior years’ expenditures of $42, $175 and $1,573 in 2017, 2016 and 2015, respectively.
3 | Depreciation expense includes accretion expense of $668, $749 and $715 in 2017, 2016 and 2015, respectively, and impairments of $1,021, $3,186 and $4,066 in 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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