Loans and finance receivables - Schedule of reconciliation of allowance for credit losses on loans and finance receivables (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Allowance for Credit Loss [Abstract]
Balance at the beginning of the year	$ 950	$ 856
Provision for credit losses	180	122
Charge-offs, net of recoveries	(79)	(52)
Balance at September 30	$ 1,051	$ 926