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Investments (Fair Values by Classification) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets |  |  |  |
Cash and cash equivalents | $ 11,956 | $ 3,800 | $ 3,000 | $ 3,241
Marketable securities | 17,965 | 37,878 |  |
Other assets | 1,648 | 2,119 |  |
Total available-for-sale investments | 29,418 | 41,169 |  |
Total available-for-sale investments |  | 41,318 |  |
Available-for-sale investments [Member] |  |  |  |
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets |  |  |  |
Cash and cash equivalents | 11,453 | 3,291 |  |
Marketable securities | 17,965 | 37,878 |  |
Other assets | 0 | 149 |  |
Total available-for-sale investments | $ 29,418 |  |  |
Total available-for-sale investments |  | $ 41,318 |  |

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