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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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