Commitment and contingencies (Details) - USD ($) $ in Billions	9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Letter of credit
Other Commitments [Line Items]
Debt instrument, term	1 year	1 year	1 year
Financial guarantee
Other Commitments [Line Items]
Guarantor obligations, current carrying value	$ 12.9	$ 11.1	$ 11.3
Financial standby letter of credit
Other Commitments [Line Items]
Guarantor obligations, current carrying value	$ 0.5	$ 0.4	$ 0.4