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Derivative instruments (Fair Value of Derivatives) (Details) - Derivatives designated as hedging instrument [Member] - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Total derivative assets, fair value | $ 275 | $ 349
Liabilities |  |
Total derivative liabilities, fair value | 519 | 570
Foreign currency contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 127 | 28
Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 54 | 237
Cross-currency swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 119 | 255
Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | 360 | 318
Interest rate swap contracts [Member] | Other current assets/Other assets [Member] |  |
Assets |  |
Total derivative assets, fair value | 29 | 66
Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] |  |
Liabilities |  |
Total derivative liabilities, fair value | $ 105 | $ 15

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