Allowance for Credit Losses - Narrative (Details) $ in Billions	12 Months Ended
	Dec. 31, 2025 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses	$ 31.2
Net addition (reduction) to the allowance for credit losses	4.4
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	3.3
Consumer | Apple Credit Card Portfolio
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	2.2
Wholesale
Financing Receivable, Allowance for Credit Loss [Line Items]
Net addition (reduction) to the allowance for credit losses	$ 1.1
Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued interest on other receivables, write-off criteria, period past due	90 days