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Segment Reporting - Consolidated Revenues by Geographic Area (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales $ 42,294 $ 40,122 $ 39,807
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 18,212 17,424 18,478
Europe, Middle East and Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 12,213 11,478 10,953
Japan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 3,212 3,122 2,846
Asia Pacific (other than Japan and China)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,909 2,751 2,483
Latin America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,415 2,339 2,155
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,184 1,586 1,435
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales $ 1,149 $ 1,422 $ 1,457