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Derivative instruments (Fair Value of Derivatives) (Details) - Derivatives designated as hedging instrument [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Total derivative assets, fair value | $ 450 | $ 286
Liabilities |  |
Total derivative liabilities, fair value | 622 | 485
Foreign currency contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 17 | 6
Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 259 | 204
Cross-currency swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 433 | 270
Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 148 | 220
Interest rate swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 0 | 10
Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | $ 215 | $ 61

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