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Allowance for credit losses - Schedule of Financing Receivables Grouped by Credit Risk (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | $ 2,417 | $ 2,607
Category A |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 224 | 357
Category B |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 633 | 270
Category C |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 1,560 | 1,980
Investment in finance leases |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 1,219 | 1,263
Investment in finance leases | Category A |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 214 | 357
Investment in finance leases | Category B |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 562 | 213
Investment in finance leases | Category C |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 443 | 693
Notes receivable |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 602 | 688
Notes receivable | Category A |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 0 | 0
Notes receivable | Category B |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 53 | 13
Notes receivable | Category C |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 549 | 675
Loans receivable |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 596 | 656
Loans receivable | Category A |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 10 | 0
Loans receivable | Category B |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | 18 | 44
Loans receivable | Category C |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Financing receivables at amortized cost | $ 568 | $ 612

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