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Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest and other income, net | $ 218 | $ 162 | $ 403 | $ 393
Interest expense, net | (332) | (347) | (675) | (685)
Interest rate swap agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on fair value hedging relationships, Hedged items | (218) | 58 | (348) | 230
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments | 218 | (51) | 351 | (215)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] | Cross-currency swap contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest and other income, net | 14 | (298) | (28) | (134)
Product sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Product sales | 5,574 | 5,679 | 10,860 | 11,022
Product sales [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] | Foreign currency contracts [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Product sales | $ 22 | $ (20) | $ 36 | $ (54)

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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