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Income Taxes, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Narrative |  |  |  |
Income tax benefit resulting from effect of tax reform adjustments | $ 1,862 |  |  |
Income tax benefit from the remeasurement of U.S. deferred income tax assets and liabilities | 2,643 |  |  |
Tax on the deemed repatriation of the accumulated earnings and profits of our international subsidiaries | 734 |  |  |
Cumulative undistributed earnings and profits of international subsidiaries | 4,700 |  |  |
Recognition of foreign withholding tax, net of U.S. federal tax benefit | 47 |  |  |
Increase in valuation allowance | 124 |  |  |
Cash and temporary cash investments | 5,850 | $ 4,816 | $ 4,114 | $ 3,689
Tax refund claim not presented in our balance sheets | 274 | 433 |  |
Income tax benefits if recognized that would impact the effective tax rate | 793 | 756 |  |
Interest expense and penalties accrued | 77 | $ 70 |  |
International subsidiaries [Member] |  |  |  |
Income Tax Narrative |  |  |  |
Cash and temporary cash investments | $ 3,200 |  |  |

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