Loans and finance receivables - Schedule of reconciliation of allowance for credit losses on loans and finance receivables (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Credit Loss [Abstract]
Balance at the beginning of the year	$ 950	$ 856	$ 765
Provision for credit losses	298	169	124
Charge-offs, net of recoveries	(114)	(75)	(33)
Balance at December 31	$ 1,134	$ 950	$ 856