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Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Interest and other income, net | $ 126 | $ 267 | $ 519 | $ 627
Interest expense, net | (355) | (325) | (1,040) | (972)
Amortization of cumulative amount of fair value hedging adjustments for discontinued hedging relationships | 4 |  | 19 |
Interest rate swap agreements [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on fair value hedging relationships, Hedged items | 48 |  | 278 |
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments | (44) |  | (259) |
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 | (36) |  | (170) |
Product sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Product sales | 5,510 | $ 5,453 | 16,532 | $ 16,226
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 | $ 3 |  | $ (51) |

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