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Segment Reporting - Consolidated Revenues by Geographic Area (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales $ 46,840 $ 42,294 $ 40,122
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 20,325 18,212 17,424
Europe, Middle East and Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 12,707 12,213 11,478
Japan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 3,583 3,212 3,122
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 3,207 2,184 1,586
Asia Pacific (other than Japan and China)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,943 2,909 2,751
Latin America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,469 2,415 2,339
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales $ 1,606 $ 1,149 $ 1,422