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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Inventory Disclosure [Abstract] |  |  |  |  |
Finished goods | $ 2,262 |  |  | $ 2,883 |
Work in process | 4,701 |  |  | 3,908 |
Raw materials and supplies | 546 |  |  | 788 |
Inventories | 7,508 | [1] | $ 7,567 | 7,578 | [1]
Noncurrent inventories not included above | 618 |  |  | $ 683 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Consumer Healthcare [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Reclassification to assets held for sale | $ 538 |  |  |  |
[1] | Amounts may not add due to rounding.

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