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Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |  |
Increase in income tax expense | $ 5,763 |  |  |
Income tax expense (benefit) | $ 5,715 | $ (48) | $ (1,729) |
Effect of change in U.S. tax rate |  | $ 2,020 |  |
Effective tax rate | 27.80% | (0.50%) | 80.00% |
Loss carry forward | $ 13,731 |  |  |
Tax credit carryforward | 1,198 |  |  |
Carry forward amount of foreign tax credit with expiration dates | 10,536 | $ 11,872 |  |
Tax Cuts and Jobs Act of 2017, existing undistributed accumulated earnings of foreign subsidiary | $ 59,900 |  |  |
Percentage of impact of unrecognized tax benefits on effective tax rate if subsequently recognized | 82.00% |  |  |
Unrecognized tax benefits | $ 5,070 | 4,828 | $ 3,031 | $ 3,042
Income tax accruals for anticipated interest and penalty obligations | 33 | 178 |  |
Income tax benefit expense associated with interest and penalties | 8 | $ (161) | $ 38 |
Property, Plant and Equipment |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Decrease in deferred tax liabilities | 400 |  |  |
Foreign Tax Credits and Tax Loss Carry Forwards |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Decrease in deferred tax assets | $ 1,800 |  |  |

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