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Derivative instruments (Fair Value of Derivatives) (Details) - Derivatives designated as hedging instruments [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Total derivative assets, fair value | $ 286 | $ 244
Liabilities |  |
Total derivative liabilities, fair value | 485 | 534
Foreign currency contracts [Member] | Other current assets/Other noncurrent assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 6 | 203
Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 204 | 4
Cross-currency swap contracts [Member] | Other current assets/ Other noncurrent assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 270 | 0
Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 220 | 523
Interest rate swap contracts [Member] | Other current assets/ Other noncurrent assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 10 | 41
Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | $ 61 | $ 7

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