Loans and Card Member Receivables (Details 2) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financing receivable recorded investment aging
Card Member loans total aging	$ 77,700	$ 87,381
Card Member receivables total aging	44,728	57,413
Global Consumer Services Group [Member]
Financing receivable recorded investment aging
Card Member loans total aging	63,849	73,266
Card Member receivables total aging	15,816	22,844
Global Consumer Services Group [Member] \| Card Member Loans [Member]
Financing receivable recorded investment aging
Current	62,758	72,101
Card Member loans total aging	63,849	73,266
Global Consumer Services Group [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
Current	15,541	22,560
Card Member receivables total aging	15,816	22,844
Global Consumer Services Group [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Card Member Loans [Member]
Financing receivable recorded investment aging
Period past due	301	322
Global Consumer Services Group [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
Period past due	85	86
Global Consumer Services Group [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Card Member Loans [Member]
Financing receivable recorded investment aging
Period past due	232	253
Global Consumer Services Group [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
Period past due	61	58
Global Consumer Services Group [Member] \| 90+ days past due [Member] \| Card Member Loans [Member]
Financing receivable recorded investment aging
Period past due	558	590
Global Consumer Services Group [Member] \| 90+ days past due [Member] \| Card Member Receivables [Member]
Financing receivable recorded investment aging
Period past due	129	140
Global Commercial Services [Member]
Financing receivable recorded investment aging
Card Member loans total aging	13,851	14,115
Card Member receivables total aging	28,912	34,569
Global Commercial Services [Member] \| Card Member Loans [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Current	13,597	13,898
Card Member loans total aging	13,795	14,079
Global Commercial Services [Member] \| Card Member Loans [Member] \| Global Corporate Payments [Member]
Financing receivable recorded investment aging
Card Member loans total aging	56	36
Global Commercial Services [Member] \| Card Member Receivables [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Current	15,382	17,113
Card Member receivables total aging	15,703	17,404
Global Commercial Services [Member] \| Card Member Receivables [Member] \| Global Corporate Payments [Member]
Financing receivable recorded investment aging
Card Member receivables total aging	13,209	17,165
Global Commercial Services [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Card Member Loans [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Period past due	63	56
Global Commercial Services [Member] \| Financial Asset, 30 to 59 Days Past Due [Member] \| Card Member Receivables [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Period past due	112	99
Global Commercial Services [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Card Member Loans [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Period past due	47	40
Global Commercial Services [Member] \| Financial Asset, 60 to 89 Days Past Due [Member] \| Card Member Receivables [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Period past due	78	58
Global Commercial Services [Member] \| 90+ days past due [Member] \| Card Member Loans [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Period past due	88	85
Global Commercial Services [Member] \| 90+ days past due [Member] \| Card Member Loans [Member] \| Global Corporate Payments [Member]
Financing receivable recorded investment aging
Period past due	0	0
Global Commercial Services [Member] \| 90+ days past due [Member] \| Card Member Receivables [Member] \| Global Small Business Services [Member]
Financing receivable recorded investment aging
Period past due	131	134
Global Commercial Services [Member] \| 90+ days past due [Member] \| Card Member Receivables [Member] \| Global Corporate Payments [Member]
Financing receivable recorded investment aging
Period past due	$ 139	$ 136

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Amount of financing receivable past due.

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