Contingencies (Details Textuals)	Mar. 31, 2021 USD ($)	Jan. 29, 2019 state
Minimum
Loss Contingencies [Line Items]
Current estimate of possible loss	$ 0
Maximum
Loss Contingencies [Line Items]
Current estimate of possible loss	220,000,000
Exposure Associated with Card Member Purchases of Goods and Services
Loss Contingencies [Line Items]
Loss accrual	$ 78,000,000
Violation Of Federal Antitrust Law And Consumer Laws Class Action Case
Loss Contingencies [Line Items]
Number of states with remaining claims under antitrust laws | state		11
Number of states with remaining claims under consumer protection laws | state		6