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Debt - ABS Financing Facilities (Details) $ in Millions	1 Months Ended					3 Months Ended			9 Months Ended
Debt - ABS Financing Facilities (Details) $ in Millions	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Apr. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Feb. 28, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) agreement	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Proceeds from asset-backed long-term borrowings									$ 7,340	$ 8,229
Repayments of debt						$ 1,398	$ 2,158	$ 1,978	5,534
Retained Notes
Debt Instrument [Line Items]
Proceeds from asset-backed long-term borrowings						394			$ 523
2021 ABS Financing Facility \| Secured Debt
Debt Instrument [Line Items]
Number of loan agreements \| agreement									2
Repayments of debt	$ 1,100	$ 200		$ 1,400	$ 250
Amount drawn from credit facilities		$ 100	$ 1,100
Debt outstanding	6,400					6,400			$ 6,400
2022 ABS Financing Facility \| Secured Debt
Debt Instrument [Line Items]
Repayments of debt			$ 241		$ 163
Amount drawn from credit facilities				$ 189
Debt outstanding	$ 4,800					$ 4,800			$ 4,800