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, 2023	Sep. 30, 2022
Allowance for Credit Loss [Abstract]
Balance at beginning of year	$ 856	$ 765
Provision for credit losses	122	45
Charge-offs, net of recoveries	(52)	(25)
Balance at September 30	$ 926	$ 785