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Derivative instruments (Fair Value of Derivatives) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Total derivative assets, fair value	$ 408
Liabilities
Total derivative liabilities, fair value	576
Derivatives designated as hedging instruments [Member]
Assets
Total derivative assets, fair value	407	$ 286
Liabilities
Total derivative liabilities, fair value	576	485
Derivatives designated as hedging instruments [Member] | Foreign currency contracts [Member] | Other current assets/Other assets [Member]
Assets
Total derivative assets, fair value	181	6
Derivatives designated as hedging instruments [Member] | Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]
Liabilities
Total derivative liabilities, fair value	26	204
Derivatives designated as hedging instruments [Member] | Cross-currency swap contracts [Member] | Other current assets/Other assets [Member]
Assets
Total derivative assets, fair value	170	270
Derivatives designated as hedging instruments [Member] | Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]
Liabilities
Total derivative liabilities, fair value	401	220
Derivatives designated as hedging instruments [Member] | Interest rate swap contracts [Member] | Other current assets/Other assets [Member]
Assets
Total derivative assets, fair value	56	10
Derivatives designated as hedging instruments [Member] | Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]
Liabilities
Total derivative liabilities, fair value	149	$ 61
Derivatives not designated as hedging instruments [Member]
Assets
Total derivative assets, fair value	1
Liabilities
Total derivative liabilities, fair value	0
Derivatives not designated as hedging instruments [Member] | Foreign currency contracts [Member] | Other current assets [Member]
Assets
Total derivative assets, fair value	1
Derivatives not designated as hedging instruments [Member] | Foreign currency contracts [Member] | Accrued liabilities [Member]
Liabilities
Total derivative liabilities, fair value	$ 0

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