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Properties, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | $ 345,232 | $ 326,722 |
Gross Investment at Cost |  |  | $ 340,244
Net Investment | 156,618 | 150,494 |
Net Investment |  |  | 169,207
Additions at Cost | 25,546 | 13,555 | 13,066
Depreciation Expense | 19,508 | 29,218 | 19,419
Dry hole expense related to prior years expenditures, net | 709 | 49 | 343
Accretion expense | 560 | 628 | 654
Impairment charges | 2,792 | 10,797 | 735
Noble |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 16,703 |  |
Net Investment | 16,703 |  |
Additions at Cost | 16,703 |  |
United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 127,249 | 112,804 |
Gross Investment at Cost |  |  | 117,507
Net Investment | 51,192 | 44,716 |
Net Investment |  |  | 52,550
Additions at Cost | 13,899 | 9,527 | 7,917
Depreciation Expense | 8,095 | 16,334 | 6,399
International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 217,983 | 213,918 |
Gross Investment at Cost |  |  | 222,737
Net Investment | 105,426 | 105,778 |
Net Investment |  |  | 116,657
Additions at Cost | 11,647 | 4,028 | 5,149
Depreciation Expense | 11,413 | 12,884 | 13,020
Australia |  |  |
Properties, Plant and Equipment |  |  |
Net Investment | 48,060 | 51,359 |
Net Investment |  |  | 53,768
Operating Segments | Upstream |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 306,401 | 288,409 |
Gross Investment at Cost |  |  | 303,484
Net Investment | 140,185 | 133,721 |
Net Investment |  |  | 153,129
Additions at Cost | 24,136 | 11,415 | 11,299
Depreciation Expense | 17,962 | 27,840 | 18,054
Operating Segments | Upstream | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 96,555 | 82,117 |
Gross Investment at Cost |  |  | 88,155
Net Investment | 38,175 | 31,082 |
Net Investment |  |  | 39,526
Additions at Cost | 13,067 | 7,751 | 6,434
Depreciation Expense | 6,841 | 15,222 | 5,328
Operating Segments | Upstream | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 209,846 | 206,292 |
Gross Investment at Cost |  |  | 215,329
Net Investment | 102,010 | 102,639 |
Net Investment |  |  | 113,603
Additions at Cost | 11,069 | 3,664 | 4,865
Depreciation Expense | 11,121 | 12,618 | 12,726
Operating Segments | Downstream |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 34,492 | 33,448 |
Gross Investment at Cost |  |  | 31,922
Net Investment | 14,496 | 14,512 |
Net Investment |  |  | 13,861
Additions at Cost | 1,211 | 1,807 | 1,537
Depreciation Expense | 1,134 | 1,125 | 1,033
Operating Segments | Downstream | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 26,499 | 25,968 |
Gross Investment at Cost |  |  | 24,685
Net Investment | 11,101 | 11,398 |
Net Investment |  |  | 10,838
Additions at Cost | 638 | 1,452 | 1,259
Depreciation Expense | 851 | 869 | 751
Operating Segments | Downstream | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 7,993 | 7,480 |
Gross Investment at Cost |  |  | 7,237
Net Investment | 3,395 | 3,114 |
Net Investment |  |  | 3,023
Additions at Cost | 573 | 355 | 278
Depreciation Expense | 283 | 256 | 282
Segment Reconciling Items |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 4,339 | 4,865 |
Gross Investment at Cost |  |  | 4,838
Net Investment | 1,937 | 2,261 |
Net Investment |  |  | 2,217
Additions at Cost | 199 | 333 | 230
Depreciation Expense | 412 | 253 | 332
Segment Reconciling Items | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 4,195 | 4,719 |
Gross Investment at Cost |  |  | 4,667
Net Investment | 1,916 | 2,236 |
Net Investment |  |  | 2,186
Additions at Cost | 194 | 324 | 224
Depreciation Expense | 403 | 243 | 320
Segment Reconciling Items | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 144 | 146 |
Gross Investment at Cost |  |  | 171
Net Investment | 21 | 25 |
Net Investment |  |  | 31
Additions at Cost | 5 | 9 | 6
Depreciation Expense | $ 9 | $ 10 | $ 12

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