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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Jul. 25, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense | $ 519 | $ 534 | $ 985 | $ 1,321 |  |
Tax expense, entities included in effective tax rate calculation |  | $ 621 |  | $ 1,500 |  |
Decrease in uncertain tax positions from settlement of transfer pricing matters | 412 |  |  |  |  |
Net deferred tax assets | $ 22,500 |  | $ 22,500 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax expense related to tax reform legislation |  |  |  |  | $ 7,300 |
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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- Definition Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act of 2017, Incomplete Accounting Adjustment, Amount + References No definition available. + Details
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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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