Loans and Card Member Receivables (Details 2) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 88,562	$ 73,373
Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	53,645	43,701
Global Consumer Services Group | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	70,467	60,084
Global Consumer Services Group | Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	22,392	18,685
Global Consumer Services Group | Current | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	69,960	59,442
Global Consumer Services Group | Current | Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	22,279	18,570
Global Consumer Services Group | 30-59 Days Past Due | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	158	177
Global Consumer Services Group | 30-59 Days Past Due | Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	41	33
Global Consumer Services Group | 60-89 Days Past Due | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	112	148
Global Consumer Services Group | 60-89 Days Past Due | Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	24	26
Global Consumer Services Group | 90+ Days Past Due | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	237	317
Global Consumer Services Group | 90+ Days Past Due | Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	48	56
Global Commercial Services | Card Member loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	18,095	13,289
Global Commercial Services | Card Member loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	18,040	13,226
Global Commercial Services | Card Member loans | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	55	63
Global Commercial Services | Card Member receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	31,253	25,016
Global Commercial Services | Card Member receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	17,977	14,119
Global Commercial Services | Card Member receivables | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	13,276	10,897
Global Commercial Services | Current | Card Member loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	17,950	13,132
Global Commercial Services | Current | Card Member receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	17,846	14,023
Global Commercial Services | 30-59 Days Past Due | Card Member loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	34	27
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	59	37
Global Commercial Services | 60-89 Days Past Due | Card Member loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	19	20
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	28	21
Global Commercial Services | 90+ Days Past Due | Card Member loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	37	47
Global Commercial Services | 90+ Days Past Due | Card Member loans | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	0	0
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	44	38
Global Commercial Services | 90+ Days Past Due | Card Member receivables | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 42	$ 60