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Stockholders' equity (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Interest and other income, net | $ 114 |  |  | $ 126 |  |  | $ 517 | $ 519
Income before income taxes | 2,277 |  |  | 2,094 |  |  | 7,155 | 7,360
Provision for income taxes | (309) |  |  | (235) |  |  | (1,016) | (894)
Net income | 1,968 | $ 2,179 | $ 1,992 | 1,859 | $ 2,296 | $ 2,311 | 6,139 | 6,466
Product sales [Member] |  |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Product sales | 5,463 |  |  | 5,510 |  |  | 16,323 | 16,532
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 | (38) |  |  | (33) |  |  | (30) | (221)
Provision for income taxes | 8 |  |  | 7 |  |  | 6 | 47
Net income | (30) |  |  | (26) |  |  | (24) | (174)
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 | (3) |  |  | (103) |  |  | (9) | (352)
Provision for income taxes | 0 |  |  | 1 |  |  | 0 | 3
Net income | (3) |  |  | (102) |  |  | (9) | (349)
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 | 26 |  |  | 3 |  |  | 62 | (51)
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 | (64) |  |  | (36) |  |  | (92) | (170)
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 | 26 |  |  | 3 |  |  | 62 | (51)
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 | $ (64) |  |  | $ (36) |  |  | $ (92) | $ (170)

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