For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Significant Credit Concentrations (Details Textual) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Card Members, Member Loans And Other Loans
Concentration Risk [Line Items]
Unused lines-of-credit	$ 350
Card Members, Member Loans
Concentration Risk [Line Items]
Unused lines-of-credit		$ 327
Geographic \| Card Members, Member Loans And Other Loans \| United States
Concentration Risk [Line Items]
Concentration risk percentage	80.00%
Geographic \| Card Members, Member Loans \| United States
Concentration Risk [Line Items]
Concentration risk percentage		80.00%