Card Member Receivables and Card Member Loans (Details 2) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 |
Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | $ 12,868 | $ 12,157 |
Global Consumer Services Group | Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 2,169 | 2,157 |
Global Consumer Services Group | Card Member Loans | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 479 | 500 |
Global Consumer Services Group | Current | Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 2,157 | 2,139 |
Global Consumer Services Group | Current | Card Member Loans | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 474 | 493 |
Global Consumer Services Group | 30-59 Days Past Due | Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 3 | 5 |
Global Consumer Services Group | 30-59 Days Past Due | Card Member Loans | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 1 | 2 |
Global Consumer Services Group | 60-89 Days Past Due | Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 2 | 4 |
Global Consumer Services Group | 60-89 Days Past Due | Card Member Loans | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 1 | 1 |
Global Consumer Services Group | 90+ Days Past Due | Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 7 | 9 |
Global Consumer Services Group | 90+ Days Past Due | Card Member Loans | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 3 | 4 |
Global Commercial Services | Card Member Receivables | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 10,699 | 10,000 |
Global Commercial Services | Card Member Receivables | Global Small Business Services | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 1,109 | 1,057 |
Global Commercial Services | Card Member Receivables | Global Corporate Payments | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 9,590 | 8,943 |
Global Commercial Services | Current | Card Member Receivables | Global Small Business Services | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 1,101 | 1,047 |
Global Commercial Services | 30-59 Days Past Due | Card Member Receivables | Global Small Business Services | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 3 | 3 |
Global Commercial Services | 60-89 Days Past Due | Card Member Receivables | Global Small Business Services | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 1 | 2 |
Global Commercial Services | 90+ Days Past Due | Card Member Receivables | Global Small Business Services | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | 4 | 5 |
Global Commercial Services | 90+ Days Past Due | Card Member Receivables | Global Corporate Payments | | |
Accounts, Notes, Loans and Financing Receivable [Line Items] | | |
Financing receivables, gross | $ 24 | $ 32 |