Allowance for Credit Losses - Narrative (Details) $ in Billions	9 Months Ended
	Sep. 30, 2025 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 29.1
Net addition to the allowance for credit losses	2.2
Wholesale
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition to the allowance for credit losses	1.2
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition to the allowance for credit losses	$ 1.1