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Segment Information (Net Sales and Long-Lived Assets by Country) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales to external customers $ 5,702 $ 5,418 $ 5,347 $ 4,786 $ 5,656 $ 5,248 $ 5,198 $ 4,616 $ 21,253 $ 20,718 $ 20,891
Long-lived assets 9,742       9,318       9,742 9,318 9,458
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales to external customers                 10,378 9,901 9,189
Long-lived assets 4,577       4,587       4,577 4,587 4,558
Brazil                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales to external customers                 2,079 1,895 1,915
Long-lived assets 356       336       356 336 253
China                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales to external customers                 824 945 1,003
Long-lived assets 1,066       981       1,066 981 1,038
All Other Countries                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales to external customers                 7,972 7,977 8,784
Long-lived assets $ 3,743       $ 3,414       $ 3,743 $ 3,414 $ 3,609