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Variable interest entities and asset securitizations - Asset-backed Notes Issued to Investors (Details) - USD ($)	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Asset-Backed Notes to Investors	$ 1,929,000,000	$ 1,229,000,000
August 2023 | Equipment finance loans and leases
Variable Interest Entity [Line Items]
Remaining collateral balance	284,000,000	416,000,000
Asset-Backed Notes to Investors	$ 177,000,000	297,000,000
Weighted-Average Life (In years)	8 months 12 days
Weighted-Average Rate	5.74%
March 2024 | Automobile loans
Variable Interest Entity [Line Items]
Remaining collateral balance	$ 282,000,000	383,000,000
Asset-Backed Notes to Investors	$ 269,000,000	371,000,000
Weighted-Average Life (In years)	1 year 3 months 18 days
Weighted-Average Rate	5.25%
August 2024 | Equipment finance loans and leases
Variable Interest Entity [Line Items]
Remaining collateral balance	$ 536,000,000	691,000,000
Asset-Backed Notes to Investors	$ 437,000,000	561,000,000
Weighted-Average Life (In years)	1 year 6 months
Weighted-Average Rate	4.87%
February 2025 | Automobile loans
Variable Interest Entity [Line Items]
Remaining collateral balance	$ 583,000,000	0
Asset-Backed Notes to Investors	$ 568,000,000	0
Weighted-Average Life (In years)	1 year 6 months
Weighted-Average Rate	4.74%
May 2025 | Equipment finance loans and leases
Variable Interest Entity [Line Items]
Remaining collateral balance	$ 591,000,000	0
Asset-Backed Notes to Investors	$ 478,000,000	$ 0
Weighted-Average Life (In years)	1 year 10 months 24 days
Weighted-Average Rate	4.75%

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