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Stockholders' equity (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and other income, net | $ 11 | $ 185
Income before income taxes | 2,020 | 2,314
Provision for income taxes | (195) | (322)
Net income | 1,825 | 1,992
Product sales [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Product sales | 5,894 | 5,286
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Income before income taxes | (84) | (28)
Provision for income taxes | 18 | 6
Net income | (66) | (22)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale securities [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and other income, net | 33 | (4)
Provision for income taxes | (7) | 0
Net income | 26 | (4)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign currency contract [Member] | Cash flow hedges [Member] | Product sales [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Product sales | 49 | 14
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cross-currency swap contract [Member] | Cash flow hedges [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and other income, net | (133) | (42)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] | Foreign currency contract [Member] | Cash flow hedges [Member] | Product sales [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Product sales | 49 | 14
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] | Cross-currency swap contract [Member] | Cash flow hedges [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and other income, net | $ (133) | $ (42)

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