Card Member Receivables and Card Member Loans (Details 2) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Card Member Receivables
Financing receivable recorded investment aging
Total	$ 11,545	$ 12,157
Global Consumer Services Group | Card Member Receivables
Financing receivable recorded investment aging
Current	1,872	2,139
Total	1,889	2,157
Global Consumer Services Group | Card Member Loans
Financing receivable recorded investment aging
Current	452	493
Total	459	500
Global Consumer Services Group | 30-59 Days Past Due | Card Member Receivables
Financing receivable recorded investment aging
Period past due	6	5
Global Consumer Services Group | 30-59 Days Past Due | Card Member Loans
Financing receivable recorded investment aging
Period past due	2	2
Global Consumer Services Group | 60-89 Days Past Due | Card Member Receivables
Financing receivable recorded investment aging
Period past due	3	4
Global Consumer Services Group | 60-89 Days Past Due | Card Member Loans
Financing receivable recorded investment aging
Period past due	2	1
Global Consumer Services Group | 90+ Days Past Due | Card Member Receivables
Financing receivable recorded investment aging
Period past due	8	9
Global Consumer Services Group | 90+ Days Past Due | Card Member Loans
Financing receivable recorded investment aging
Period past due	3	4
Global Commercial Services | Card Member Receivables
Financing receivable recorded investment aging
Total	9,656	10,000
Global Commercial Services | Card Member Receivables | Global Small Business Services
Financing receivable recorded investment aging
Current	970	1,047
Total	978	1,057
Global Commercial Services | Card Member Receivables | Global Corporate Payments
Financing receivable recorded investment aging
Total	8,678	8,943
Global Commercial Services | 30-59 Days Past Due | Card Member Receivables | Global Small Business Services
Financing receivable recorded investment aging
Period past due	3	3
Global Commercial Services | 60-89 Days Past Due | Card Member Receivables | Global Small Business Services
Financing receivable recorded investment aging
Period past due	1	2
Global Commercial Services | 90+ Days Past Due | Card Member Receivables | Global Small Business Services
Financing receivable recorded investment aging
Period past due	4	5
Global Commercial Services | 90+ Days Past Due | Card Member Receivables | Global Corporate Payments
Financing receivable recorded investment aging
Period past due	$ 27	$ 32