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Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Intangible Assets |  |
Cost | $ 6,547 | $ 6,963
Accumulated Amortization | (1,883) | (1,804)
Net | 4,664 | 5,159
Customer Relationships [Member] |  |
Intangible Assets |  |
Cost | 6,367 | 6,782
Accumulated Amortization | (1,840) | (1,782)
Net | 4,527 | 5,000
Trademarks [Member] |  |
Intangible Assets |  |
Cost | 180 | 181
Accumulated Amortization | (43) | (22)
Net | $ 137 | $ 159

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