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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Product sales | $ 8,388 | $ 6,986 | $ 15,835 | $ 13,091
Other (expense) income, net | (307) | (318) | (542) | 1,746
Interest expense, net | (808) | (752) | (1,632) | (1,295)
Interest rate swap agreements |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) on fair value hedging relationships, hedged items | (18) | 93 | 31 | 5
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments | 36 | (72) | 8 | 42
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Cross-currency swap contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other (expense) income, net | (3) | 51 | (34) | 29
Product sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Product sales | 8,041 | 6,683 | 15,159 | 12,529
Product sales | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Foreign currency forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Product sales | $ 55 | $ 36 | $ 106 | $ 88

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