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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