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Derivative instruments - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
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