Card Member Receivables and Card Member Loans (Details 3)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Global Consumer Services Group | Card Member Receivables
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	0.57%	1.10%
Global Consumer Services Group | Card Member Receivables | Net Write-Off Rate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.73%	1.62%
Global Consumer Services Group | Card Member Loans
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	0.84%	1.77%
Global Consumer Services Group | Card Member Loans | Net Write-Off Rate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	2.62%	2.66%
Global Commercial Services | Card Member Receivables | Global Small Business Services
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	0.69%	1.08%
Global Commercial Services | Card Member Receivables | Net Write-Off Rate | Global Small Business Services
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	1.38%	2.14%
Global Commercial Services | Card Member Receivables | Net Write-Off Rate | Global Corporate Payments
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.24%	1.49%
Global Corporate Payments | Card Member Receivables
Credit Quality Indicator for Loans and Receivables
90+ Days Past Billing as a % of total	0.27%	0.64%