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Derivative instruments - (Fair Value of Derivatives) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Total derivative assets, fair value | $ 549 | $ 408
Liabilities |  |
Total derivative liabilities, fair value | 346 | 576
Derivatives designated as hedging instruments [Member] |  |
Assets |  |
Total derivative assets, fair value | 548 | 407
Liabilities |  |
Total derivative liabilities, fair value | 346 | 576
Derivatives designated as hedging instruments [Member] | Foreign currency contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 223 | 181
Derivatives designated as hedging instruments [Member] | Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 31 | 26
Derivatives designated as hedging instruments [Member] | Cross-currency swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 66 | 170
Derivatives designated as hedging instruments [Member] | Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 315 | 401
Derivatives designated as hedging instruments [Member] | Interest rate swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 259 | 56
Derivatives designated as hedging instruments [Member] | Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 0 | 149
Derivatives not designated as hedging instruments [Member] |  |
Assets |  |
Total derivative assets, fair value | 1 | 1
Liabilities |  |
Total derivative liabilities, fair value | 0 | 0
Derivatives not designated as hedging instruments [Member] | Foreign currency contracts [Member] | Other current assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 1 | 1
Derivatives not designated as hedging instruments [Member] | Foreign currency contracts [Member] | Accrued liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | $ 0 | $ 0

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