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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 | 3 Months Ended
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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

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