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, 2025	Mar. 31, 2024
Allowance for Credit Loss [Abstract]
Balance at the beginning of the year	$ 1,134	$ 950
Provision for credit losses	183	39
Charge-offs, net of recoveries	(41)	(16)
Balance at March 31	$ 1,276	$ 973