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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

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