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Fair value measurement - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value Disclosures [Abstract] |  |
Aggregate fair value of long-term debt, including current portion | $ 57,800 | $ 59,200
Carrying value of long-term debt, including current portion | $ 64,020 | $ 64,613

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