v3.24.4
Credit Card and Private Student Loan Securitization Activities (Narrative) (Details)
12 Months Ended
Dec. 31, 2023
classes
Variable Interest Entity, Primary Beneficiary [Member] | Discover Card Execution Note Trust [Member] | Credit Card Securitization Trusts [Member]  
Variable Interest Entity [Line Items]  
Number of classes of securities in debt structure (in classes) 4