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Segment Reporting - Consolidated Revenues by Geographic Area (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | $ 40,122 | $ 39,807 | $ 39,498
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 17,424 | 18,478 | 17,519
Europe, Middle East and Africa |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 11,478 | 10,953 | 10,677
Asia Pacific |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 4,337 | 3,918 | 3,825
Japan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 3,122 | 2,846 | 2,673
Latin America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 2,339 | 2,155 | 2,825
Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | $ 1,422 | $ 1,457 | $ 1,979

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