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Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets    
Cost $ 6,449 $ 6,547
Accumulated Amortization (2,499) (1,883)
Net 3,950 4,664
Customer Relationships [Member]    
Intangible Assets    
Cost 6,300 6,367
Accumulated Amortization (2,442) (1,840)
Net 3,858 4,527
Trademarks [Member]    
Intangible Assets    
Cost 149 180
Accumulated Amortization (57) (43)
Net $ 92 $ 137