Loans and finance receivables - Schedule of reconciliation of allowance for credit losses on loans and finance receivables (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Allowance for Credit Loss [Abstract]
Balance at beginning of year	$ 856	$ 765
Provision for credit losses	37	22
Charge-offs, net of recoveries	(17)	(6)
Balance at March 31	$ 876	$ 781