Asset Securitizations (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Assets from Trusts [Line Items]
Restricted cash and cash equivalents	$ 471,000,000	$ 514,000,000
American Express Lending Trust
Assets from Trusts [Line Items]
Direct and Indirect ownership of variable interests	10,500,000,000	15,300,000,000
Restricted cash and cash equivalents	101,000,000	66,000,000
American Express Charge Trust
Assets from Trusts [Line Items]
Direct and Indirect ownership of variable interests	4,500,000,000	4,600,000,000
Restricted cash and cash equivalents	$ 0	$ 0