Asset Securitizations (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Assets from Trusts [Line Items]
Restricted cash and cash equivalents	$ 198,000,000	$ 427,000,000
American Express Lending Trust
Assets from Trusts [Line Items]
Direct and Indirect ownership of variable interests	13,100,000,000	14,600,000,000
Restricted cash and cash equivalents	97,000,000	88,000,000
American Express Charge Trust
Assets from Trusts [Line Items]
Direct and Indirect ownership of variable interests	1,500,000,000	3,900,000,000
Restricted cash and cash equivalents	$ 10,000,000	$ 0