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Derivative instruments and hedging activities - Notional Amounts (Details) € in Millions, £ in Millions, $ in Millions	Jun. 30, 2024 USD ($) derivative	Jun. 30, 2024 EUR (€) derivative	Jun. 30, 2024 GBP (£) derivative
Derivatives designated as hedging instruments \| Cash Flow Hedging
Derivative [Line Items]
Derivative, number of instruments \| derivative	5	5	5
Derivative, notional amount \| $	$ 2,500
Interest rate swap \| Derivatives designated as hedging instruments \| Cash Flow Hedging
Derivative [Line Items]
Derivative, number of instruments \| derivative	2	2	2
Derivative, notional amount \| $	$ 1,000
Interest rate cap \| Derivatives designated as hedging instruments \| Cash Flow Hedging
Derivative [Line Items]
Derivative, number of instruments \| derivative	3	3	3
Derivative, notional amount \| $	$ 1,500
Interest rate cap \| Derivatives NOT designated as hedging instruments
Derivative [Line Items]
Derivative, number of instruments \| derivative	7	7	7
Derivative, notional amount \| $	$ 1,320
Buy EUR/Sell GBP forward \| Derivatives designated as hedging instruments \| Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount		€ 24	£ 21
Buy USD/Sell GBP forward \| Derivatives designated as hedging instruments \| Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount	$ 5		£ 4