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Summary of Significant Accounting Policies - Principles of Consolidation, Shipping and Handling Costs, Inventories, & Property, Plant, and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Principles of Consolidation [Abstract] |  |  |
Investments accounted for using the equity method, minimum interest | 20.00% |  |
Investments accounted for using the equity method, maximum interest | 50.00% |  |
Equity method investments included in other assets | $ 42 | $ 38 |
Investments accounted for using the cost method, maximum interest | 20.00% |  |
Shipping and Handling Costs [Abstract] |  |  |
Shipping and handling costs classified as Selling, general and administrative expenses | $ 1,183 | $ 1,140 | $ 1,235
Inventories [Abstract] |  |  |
Approximate percentage of inventories determined using the first-in, first-out (FIFO) method | 75.00% |  |
Minimum | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Maximum | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years |  |
Maximum | Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 40 years |  |

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