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Taxes - Effective Income Tax Reconcilliation and Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income (loss) before income taxes |  |  |
United States | $ 4,730 | $ (441) | $ (4,317)
International | 15,845 | 9,662 | 2,157
Income (Loss) Before Income Tax Expense | 20,575 | 9,221 | (2,160)
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Theoretical tax (at U.S. statutory rate of 21% - 2018, 35% - 2017 & 2016) | 4,321 | 3,227 | (756)
Effect of U.S. tax reform | (26) | (2,020) | 0
Equity affiliate accounting effect | (1,526) | (1,373) | (704)
Effect of income taxes from international operations | 3,132 | (130) | 608
State and local taxes on income, net of U.S. federal income tax benefit | 162 | 39 | (44)
Prior year tax adjustments, claims and settlements | (51) | (39) | (349)
Tax credits | (163) | (199) | (188)
Other U.S. | (134) | 447 | (296)
Total income tax expense (benefit) | $ 5,715 | $ (48) | $ (1,729)
Effective income tax rate | 27.80% | (0.50%) | 80.00%
Deferred tax liabilities |  |  |
Properties, plant and equipment | $ 20,159 | $ 19,869 |
Investments and other | 4,943 | 4,796 |
Total deferred tax liabilities | 25,102 | 24,665 |
Deferred tax assets |  |  |
Foreign tax credits | (10,536) | (11,872) |
Asset retirement obligations/environmental reserves | (5,328) | (5,511) |
Employee benefits | (2,787) | (3,129) |
Deferred credits | (1,373) | (1,769) |
Tax loss carryforwards | (4,948) | (5,463) |
Other accrued liabilities | (595) | (842) |
Inventory | (505) | (336) |
Miscellaneous | (3,481) | (2,415) |
Total deferred tax assets | (29,553) | (31,337) |
Deferred tax assets valuation allowance | 15,973 | 16,574 |
Total deferred taxes, net | 11,522 | 9,902 |
Classification of deferred taxes |  |  |
Deferred charges and other assets | (4,399) | (4,750) |
Noncurrent deferred income taxes | 15,921 | 14,652 |
Total deferred taxes, net | $ 11,522 | $ 9,902 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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