Asset Securitizations (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Assets from Trusts [Line Items]
Restricted cash and cash equivalents	$ 180,000,000	$ 427,000,000
American Express Lending Trust
Assets from Trusts [Line Items]
Direct and Indirect ownership of variable interests	12,800,000,000	14,600,000,000
Restricted cash and cash equivalents	102,000,000	88,000,000
American Express Charge Trust
Assets from Trusts [Line Items]
Direct and Indirect ownership of variable interests	4,200,000,000	3,900,000,000
Restricted cash and cash equivalents	$ 0	$ 0