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Properties, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | $ 344,485 | $ 336,077 | $ 340,277
Net Investment | 177,712 | 182,186 | 188,396
Additions at Cost | 14,364 | 17,623 | 28,002
Depreciation Expense | 19,349 | 19,457 | 21,037
United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 112,998 | 111,987 | 122,550
Net Investment | 51,409 | 52,541 | 56,791
Additions at Cost | 6,120 | 5,158 | 7,639
Depreciation Expense | 6,957 | 7,860 | 9,862
International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 231,487 | 224,090 | 217,727
Net Investment | 126,303 | 129,645 | 131,605
Additions at Cost | 8,244 | 12,465 | 20,363
Depreciation Expense | 12,392 | 11,597 | 11,175
Upstream |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 308,813 | 298,486 | 302,243
Net Investment | 161,913 | 165,212 | 170,584
Additions at Cost | 12,929 | 16,516 | 26,579
Depreciation Expense | 17,623 | 17,823 | 19,348
Upstream | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 84,602 | 83,929 | 93,848
Net Investment | 38,722 | 39,710 | 43,125
Additions at Cost | 4,995 | 4,432 | 6,586
Depreciation Expense | 5,527 | 6,576 | 8,545
Upstream | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 224,211 | 214,557 | 208,395
Net Investment | 123,191 | 125,502 | 127,459
Additions at Cost | 7,934 | 12,084 | 19,993
Depreciation Expense | 12,096 | 11,247 | 10,803
Downstream |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 30,692 | 32,145 | 32,379
Net Investment | 13,420 | 14,290 | 14,897
Additions at Cost | 1,213 | 903 | 1,061
Depreciation Expense | 1,035 | 1,288 | 1,233
Downstream | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 23,598 | 22,795 | 23,202
Net Investment | 10,346 | 10,196 | 10,807
Additions at Cost | 907 | 528 | 696
Depreciation Expense | 753 | 956 | 878
Downstream | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 7,094 | 9,350 | 9,177
Net Investment | 3,074 | 4,094 | 4,090
Additions at Cost | 306 | 375 | 365
Depreciation Expense | 282 | 332 | 355
All Other |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 4,980 | 5,446 | 5,655
Net Investment | 2,379 | 2,684 | 2,915
Additions at Cost | 222 | 204 | 362
Depreciation Expense | 691 | 346 | 456
All Other | United States |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 4,798 | 5,263 | 5,500
Net Investment | 2,341 | 2,635 | 2,859
Additions at Cost | 218 | 198 | 357
Depreciation Expense | 677 | 328 | 439
All Other | International |  |  |
Properties, Plant and Equipment |  |  |
Gross Investment at Cost | 182 | 183 | 155
Net Investment | 38 | 49 | 56
Additions at Cost | 4 | 6 | 5
Depreciation Expense | $ 14 | $ 18 | $ 17

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