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Loans and finance receivables - Schedule of reconciliation of allowance for credit losses on loans and finance receivables (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Allowance for Credit Loss [Abstract] |  |
Balance at the beginning of the year | $ 1,134 | $ 950
Provision for credit losses | 253 | 116
Charge-offs, net of recoveries | (80) | (51)
Balance at June 30 | $ 1,307 | $ 1,015

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