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Segment Reporting - Property, Plant and Equipment, Net by Geographic Area (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net $ 12,439 $ 12,026 $ 12,507
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 8,070 8,114 8,467
Europe, Middle East and Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 3,151 2,732 2,844
Asia Pacific      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 782 775 842
Latin America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 271 234 182
Japan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net 158 164 164
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Property, plant and equipment, net $ 7 $ 7 $ 8