Card Member Receivables and Card Member Loans (Details 3)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Global Consumer Services Group | Card Member Receivables
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	0.90%	1.65%
Global Consumer Services Group | Card Member Receivables | Net Write-Off Rate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.86%	1.11%
Global Consumer Services Group | Card Member Loans
Credit Quality Indicator for Loans and Receivables
30+ Days Past Due as a % of Total	1.53%	1.49%
Global Consumer Services Group | Card Member Loans | Net Write-Off Rate
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	3.46%	1.78%
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	0.82%	1.66%
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	1.57%	1.60%
Global Commercial Services | Card Member Receivables | Net Write-Off Rate | Global Corporate Payments
Credit Quality Indicator for Loans and Receivables
Net Write-Off Rate	0.41%	0.97%
Global Corporate Payments | Card Member Receivables
Credit Quality Indicator for Loans and Receivables
90+ Days Past Billing as a % of total	0.31%	1.66%