Loans - Credit Card Loan Portfolio, Loan Modifications, Narrative (Details) - Credit card $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan_payment	Sep. 30, 2022 USD ($)
Financing Receivable, Modified [Line Items]
Fixed payment plan period			60 months
Loans subject to a trial modification	$ 29		$ 29
FDM's that re-defaulted	$ 18	$ 9	$ 24	$ 26
Number of payments past due considered payment default for modified loans | loan_payment			2