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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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