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Marketable and Other Securities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Marketable Securities [Line Items] |  |  |
Sales proceeds from investments classified as available-for-sale and sold prior to maturity | $ 4,300 | $ 5,600 | $ 8,500
Level 3 [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Fair value of equity securities | 884 |  |
Level 3 [Member] | Interest Income and Other Non-Operating Income, Net [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Unrealized gain on equity securities | $ 142 |  |

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