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Segment Reporting - Consolidated Revenues by Geographic Area (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales $ 47,994 $ 46,840 $ 42,294
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 21,027 20,519 18,346
Europe, Middle East and Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 13,600 12,707 12,213
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 3,624 3,207 2,184
Japan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 3,376 3,583 3,212
Asia Pacific (other than China and Japan)      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,864 2,943 2,909
Latin America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales 2,274 2,469 2,415
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Sales $ 1,229 $ 1,412 $ 1,015