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Taxes (Details Textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |  |  |
Decrease in income tax benefit | $ 1,681 |  |  |
Income tax expense (benefit) | 48 | $ 1,729 | $ (132) |
Effect of change in U.S. tax rate | $ 2,020 |  |  |
Effective tax rate | (0.50%) | 80.00% | 2.70% |
Loss carry forward | $ 16,102 |  |  |
Tax credit carryforward | 1,379 |  |  |
Carry forward amount of foreign tax credit with expiration dates | 11,872 | $ 10,976 |  |
Undistributed earnings of international consolidated subsidiaries and affiliates for which no deferred income tax provision has been made for future remittances | $ 57,300 |  |  |
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized | 81.00% |  |  |
Unrecognized tax benefits | $ 4,828 | 3,031 | $ 3,042 | $ 3,552
Income tax accruals for anticipated interest and penalty obligations | 178 | 424 |  |
Income tax benefit expense associated with interest and penalties | (161) | $ 38 | $ 195 |
Property, Plant and Equipment |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Decrease in deferred tax liabilities | 5,700 |  |  |
Asset Retirement Obligation |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Decrease in deferred tax assets | $ 2,300 |  |  |

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