Contingencies and Commitments (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) state	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Total lease expense	$ 164	$ 188	$ 161
Weighted average remaining lease term	19 years
Weighted average lease discount rate (as a percent)	3.00%
Commitments related to agreements with certain cobrand partners	$ 14,000
American Express National Bank
Loss Contingencies [Line Items]
Carrying value of Federal Reserve Bank shares held	$ 132	$ 132
Violation Of Federal Antitrust Law And Consumer Laws Class Action Case | Holders of Visa and MasterCard Debit Cards
Loss Contingencies [Line Items]
Number of states with remaining claims | state	8
Violation Of Federal Antitrust Law And Consumer Laws Class Action Case | Holders of Visa, MasterCard and Discover Credit Cards with no Rewards or Annual Fee
Loss Contingencies [Line Items]
Number of states with remaining claims | state	2
Minimum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 0
Financial commitments, period	5 years
Maximum
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 400
Financial commitments, period	10 years