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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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