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, 2022	Sep. 30, 2021
Allowance for Credit Loss [Abstract]
Balance at beginning of year	$ 765	$ 712
Provision for credit losses	45	65
Charge-offs, net of recoveries	(25)	(33)
Balance at September 30	$ 785	$ 744