Loans - Credit Card Portfolio, Information on FDMs and Payment Status (Details) - Credit card - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 163
Current and less than 30 days past due and still accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	113
30–89 days past due and still accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	30
90 or more days past due and still accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	20
Term extension and interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 163
% of loan modifications to total retained credit card loans	0.09%
Weighted average contractual interest rate	3.50%	22.62%