Variable Interest Entities - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($) facility	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) facility	Sep. 30, 2025 USD ($)
Variable Interest Entity [Line Items]
Interest expense	$ 345	$ 320	$ 993	$ 949
Minimum \| Securitizations
Variable Interest Entity [Line Items]
Debt instrument, term			2 years
Maximum \| Securitizations
Variable Interest Entity [Line Items]
Debt instrument, term			7 years
Consolidated VIEs
Variable Interest Entity [Line Items]
Interest expense	$ 165	$ 161	$ 461	$ 477
Number of revolving credit card facilities \| facility	2		2
Consolidated VIEs \| Revolving Credit Card VFN Facility
Variable Interest Entity [Line Items]
Debt instrument, term			6 years
Total borrowing capacity	$ 700		$ 700
Consolidated VIEs \| Private Secured Term Funding
Variable Interest Entity [Line Items]
Debt instrument, principal amount	350		$ 350
Consolidated VIEs \| Revolving Conduit Facilities
Variable Interest Entity [Line Items]
Debt instrument, term			8 years
Total borrowing capacity	$ 5,800		$ 5,800
Number of conduit facilities \| facility	16		16