Loans and Card Member Receivables (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Credit Quality Indicator for Loans and Receivables
90+ Days Past Billing as a % of total	0.60%	0.30%
Card Member loans
Credit Quality Indicator for Loans and Receivables
Recoveries	$ 539	$ 657	$ 568
Card Member loans | Consumer
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	1.00%	0.70%
Card Member loans | Small Business
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	0.90%	0.50%
Card Member loans | Net Write-Off Rate - Principal Only | Consumer
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.90%	0.90%
Card Member loans | Net Write-Off Rate - Principal Only | Small Business
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.70%	0.60%
Card Member loans | Net Write-Off Rate Principal Interest, and Fees | Consumer
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	1.20%	1.30%
Card Member loans | Net Write-Off Rate Principal Interest, and Fees | Small Business
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.80%	0.80%
Card Member receivables
Credit Quality Indicator for Loans and Receivables
Recoveries	$ 257	$ 378	$ 386
Card Member receivables | Consumer
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	1.10%	0.50%
Card Member receivables | Small Business
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	1.50%	0.70%
Card Member receivables | Corporate
Credit Quality Indicator for Loans and Receivables
Recoveries		$ 37
Card Member receivables | Net Write-Off Rate - Principal Only | Consumer
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.80%	0.30%
Card Member receivables | Net Write-Off Rate - Principal Only | Small Business
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	1.10%	0.30%
Card Member receivables | Net Write-Off Rate Principal Interest, and Fees | Consumer
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.90%	0.40%
Card Member receivables | Net Write-Off Rate Principal Interest, and Fees | Small Business
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	1.20%	0.40%
Card Member receivables | Net Write-Off Rate Principal Interest, and Fees | Corporate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.40%	0.00%