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Derivative instruments (Fair Value of Derivatives) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Total derivative assets, fair value | $ 474 | $ 549
Liabilities |  |
Total derivative liabilities, fair value | 685 | 346
Derivatives designated as hedging instrument [Member] |  |
Assets |  |
Total derivative assets, fair value | 474 | 548
Liabilities |  |
Total derivative liabilities, fair value | 685 | 346
Derivatives designated as hedging instrument [Member] | Foreign currency contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 375 | 223
Derivatives designated as hedging instrument [Member] | Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 5 | 31
Derivatives designated as hedging instrument [Member] | Cross-currency swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 10 | 66
Derivatives designated as hedging instrument [Member] | Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 657 | 315
Derivatives designated as hedging instrument [Member] | Interest rate swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 89 | 259
Derivatives designated as hedging instrument [Member] | Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 23 | 0
Derivatives not designated as hedging instrument [Member] |  |
Assets |  |
Total derivative assets, fair value | 0 | 1
Liabilities |  |
Total derivative liabilities, fair value | 0 | 0
Derivatives not designated as hedging instrument [Member] | Foreign currency contracts [Member] | Other current assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 0 | 1
Derivatives not designated as hedging instrument [Member] | Foreign currency contracts [Member] | Accrued liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | $ 0 | $ 0

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