Card Member Receivables and Card Member Loans (Details 3)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Global Consumer Services Group | Card Member Receivables
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	0.55%	1.89%
Global Consumer Services Group | Card Member Receivables | Net Write-Off Rate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.84%	1.45%
Global Consumer Services Group | Card Member Loans
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	1.04%	2.18%
Global Consumer Services Group | Card Member Loans | Net Write-Off Rate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	3.07%	2.03%
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	0.72%	1.39%
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	1.34%	2.13%
Global Commercial Services | Card Member Receivables | Net Write-Off Rate | Global Corporate Payments
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.31%	1.26%
Global Corporate Payments | Card Member Receivables
Credit Quality Indicator for Loans and Receivables
90+ Days Past Billing as a % of total	0.25%	1.98%