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Other (Income)/Deductions - Net - Footnotes - Asset Disposals and Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jul. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 10, 2017 | Oct. 01, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property |  |  | $ 60 | $ 52 |  |  |  |
Unrealized gain on equity securities |  |  | 477 |  |  |  |  |
Hisun Pfizer Pharmaceuticals Co. Ltd [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  | $ (81) |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  | 49.00% | 49.00% |  |  | 49.00%
Loss on disposal of equity method investment | $ 81 |  |  |  |  |  |  |
Laboratorio Teuto Brasilero [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 40.00% | 40.00% | 40.00%
Loss on disposal of equity method investment |  | $ 30 |  | $ 30 |  |  |  |
Allogene [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Unrealized gain on equity securities |  |  | 466 |  |  |  |  |
Laboratorio Teuto Brasilero [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  | 60.00% |  |
Financial Assets and Liabilities [Member] |  |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |  |
Unrealized gain on equity securities |  |  | $ 477 |  |  |  |  |

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