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Accumulated Other Comprehensive (Loss) Income (AOCI) (Schedule of Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning of Period $ (761) $ (639)  
OCI 125 (94)  
Income taxes 71 (30)  
Cost of Sales 4,271 3,830 $ 3,344
Other income (227) (245) (126)
Income taxes 1,043 274 296
Other comprehensive income (loss) 208 (122) (385)
Accumulated Other Comprehensive Income (Loss), End of Period (553) (761) (639)
Reclassification out of Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Income taxes (4) (1)  
Other comprehensive income (loss) 208 (122)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cost of Sales 14 6  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other income      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other income 2 (3)  
Marketable Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning of Period 0 0  
OCI (7) 3  
Income taxes 1 (1)  
Accumulated Other Comprehensive Income (Loss), End of Period (4) 0 0
Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Income taxes 0 1  
Other comprehensive income (loss) (4) 0  
Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cost of Sales 0 0  
Marketable Securities | Reclassification out of Accumulated Other Comprehensive Income [Member] | Other income      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other income 2 (3)  
Pension Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning of Period (132) (119)  
OCI (27) (20)  
Income taxes 19 3  
Accumulated Other Comprehensive Income (Loss), End of Period (134) (132) (119)
Pension Plans | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Income taxes (2) (2)  
Other comprehensive income (loss) (2) (13)  
Pension Plans | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cost of Sales 8 6  
Pension Plans | Reclassification out of Accumulated Other Comprehensive Income [Member] | Other income      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other income 0 0  
Hedges      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning of Period 24 4  
OCI (4) 35  
Income taxes 4 (15)  
Accumulated Other Comprehensive Income (Loss), End of Period 28 24 4
Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Income taxes (2) 0  
Other comprehensive income (loss) 4 20  
Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cost of Sales 6 0  
Hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] | Other income      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other income 0 0  
Financial Statement Translation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning of Period (653) (524)  
OCI 163 (112)  
Income taxes 47 (17)  
Accumulated Other Comprehensive Income (Loss), End of Period (443) (653) $ (524)
Financial Statement Translation | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Income taxes 0 0  
Other comprehensive income (loss) 210 (129)  
Financial Statement Translation | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cost of Sales 0 0  
Financial Statement Translation | Reclassification out of Accumulated Other Comprehensive Income [Member] | Other income      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other income $ 0 $ 0