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Derivative instruments - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Derivative [Line Items] |  |
Amounts expected to be reclassified from AOCI into earnings over the next 12 months, foreign currency and cross-currency swaps | $ 200 |
Forward interest rate contracts | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amounts | 6,300 | $ 6,000
Forward interest rate contracts | Derivatives not designated as hedging instrument |  |
Derivative [Line Items] |  |
Notional amounts | 521 | 517
Interest Rate Swap | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Notional amounts | $ 6,700 | $ 6,700

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