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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Oct. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense | $ 100 | $ 2,316 | $ 1,085 | $ 3,637 |  |
Tax benefit from U.S. tax reform | 157 |  | 157 |  |  |
Tax expense, entities included in effective tax rate calculation |  | 583 |  | 2,100 |  |
Tax expense from change in deferred tax asset valuation allowance |  | $ 2,300 |  | $ 2,300 |  |
Net deferred tax assets | $ 22,400 |  | $ 22,400 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax expense related to tax reform legislation |  |  |  |  | $ 7,300 |
Tax expense related to tax reform legislation, updated |  |  |  |  | $ 7,100 |
Forecast [Member] | Germany [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  | $ 3,300
Deferred tax assets |  |  |  |  |  | $ 1,000

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