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Properties, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | $ 340,244 | $ 344,485 | $ 336,077
Net Investment | 169,207 | 177,712 | 182,186
Additions at Cost | 13,066 | 14,364 | 17,623
Depreciation Expense | 19,419 | 19,349 | 19,457
Dry hole expense related to prior years expenditures, net | 343 | 42 | 175
Accretion expense | 654 | 668 | 749
Impairment charges | 735 | 1,021 | 3,186
United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 117,507 | 112,998 | 111,987
Net Investment | 52,550 | 51,409 | 52,541
Additions at Cost | 7,917 | 6,120 | 5,158
Depreciation Expense | 6,399 | 6,957 | 7,860
International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 222,737 | 231,487 | 224,090
Net Investment | 116,657 | 126,303 | 129,645
Additions at Cost | 5,149 | 8,244 | 12,465
Depreciation Expense | 13,020 | 12,392 | 11,597
Australia |  |  |
Properties, Plant and Equipment |  |  |
Net Investment | 53,768 | 55,514 | 53,962
Upstream |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 303,484 | 308,813 | 298,486
Net Investment | 153,129 | 161,913 | 165,212
Additions at Cost | 11,299 | 12,929 | 16,516
Depreciation Expense | 18,054 | 17,623 | 17,823
Upstream | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 88,155 | 84,602 | 83,929
Net Investment | 39,526 | 38,722 | 39,710
Additions at Cost | 6,434 | 4,995 | 4,432
Depreciation Expense | 5,328 | 5,527 | 6,576
Upstream | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 215,329 | 224,211 | 214,557
Net Investment | 113,603 | 123,191 | 125,502
Additions at Cost | 4,865 | 7,934 | 12,084
Depreciation Expense | 12,726 | 12,096 | 11,247
Downstream |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 31,922 | 30,692 | 32,145
Net Investment | 13,861 | 13,420 | 14,290
Additions at Cost | 1,537 | 1,213 | 903
Depreciation Expense | 1,033 | 1,035 | 1,288
Downstream | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 24,685 | 23,598 | 22,795
Net Investment | 10,838 | 10,346 | 10,196
Additions at Cost | 1,259 | 907 | 528
Depreciation Expense | 751 | 753 | 956
Downstream | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 7,237 | 7,094 | 9,350
Net Investment | 3,023 | 3,074 | 4,094
Additions at Cost | 278 | 306 | 375
Depreciation Expense | 282 | 282 | 332
All Other |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 4,838 | 4,980 | 5,446
Net Investment | 2,217 | 2,379 | 2,684
Additions at Cost | 230 | 222 | 204
Depreciation Expense | 332 | 691 | 346
All Other | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 4,667 | 4,798 | 5,263
Net Investment | 2,186 | 2,341 | 2,635
Additions at Cost | 224 | 218 | 198
Depreciation Expense | 320 | 677 | 328
All Other | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 171 | 182 | 183
Net Investment | 31 | 38 | 49
Additions at Cost | 6 | 4 | 6
Depreciation Expense | $ 12 | $ 14 | $ 18

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