Loans and Card Member Receivables (Details 1) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 88,832	$ 88,562
Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	53,164	53,645
GCSG | Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	69,480	70,467
GCSG | Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	20,644	22,392
GCSG | Current | Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	68,933	69,960
GCSG | Current | Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	20,499	22,279
GCSG | 30 to 59 Days Past Due | Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	170	158
GCSG | 30 to 59 Days Past Due | Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	53	41
GCSG | 60 to 89 Days Past Due | Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	121	112
GCSG | 60 to 89 Days Past Due | Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	33	24
GCSG | 90+ Days Past Due | Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	256	237
GCSG | 90+ Days Past Due | Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	59	48
GCS | Card Member Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	19,352	18,095
GCS | Card Member Loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	19,270	18,040
GCS | Card Member Loans | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	82	55
GCS | Card Member Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	32,520	31,253
GCS | Card Member Receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	18,005	17,977
GCS | Card Member Receivables | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	14,515	13,276
GCS | Current | Card Member Loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	19,161	17,950
GCS | Current | Card Member Receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	17,844	17,846
GCS | 30 to 59 Days Past Due | Card Member Loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	40	34
GCS | 30 to 59 Days Past Due | Card Member Receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	65	59
GCS | 60 to 89 Days Past Due | Card Member Loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	26	19
GCS | 60 to 89 Days Past Due | Card Member Receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	40	28
GCS | 90+ Days Past Due | Card Member Loans | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	43	37
GCS | 90+ Days Past Due | Card Member Loans | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	0	0
GCS | 90+ Days Past Due | Card Member Receivables | Global Small Business Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	56	44
GCS | 90+ Days Past Due | Card Member Receivables | Global Corporate Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 50	$ 42