Loans and finance receivables - Schedule of reconciliation of allowance for credit losses on loans and finance receivables (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Allowance for Credit Loss [Abstract]
Balance at beginning of year	$ 856	$ 765
Provision for credit losses	90	50
Charge-offs, net of recoveries	(34)	(12)
Balance at June 30	$ 912	$ 803