Contingencies and Commitments (Details Textual) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) state	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Total lease expense		$ 189	$ 164	$ 188
Lease Liabilities		$ 933	$ 926
Weighted average remaining lease term		17 years	19 years
Weighted average lease discount rate (as a percent)		4.00%	3.00%
Commitments related to agreements with certain cobrand partners		$ 12,900
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
Investigations into Historical Sales Practices | Subsequent Event [Member]
Loss Contingencies [Line Items]
Amount required to pay for resolution	$ 230
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		$ 160
Financial commitments, period		10 years