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Asset Securitizations (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Assets from Trusts [Line Items]    
Restricted cash and cash equivalents $ 471 $ 514
American Express Lending Trust    
Assets from Trusts [Line Items]    
Direct and Indirect ownership of variable interests 12,100 15,300
Restricted cash and cash equivalents 81 66
American Express Charge Trust    
Assets from Trusts [Line Items]    
Direct and Indirect ownership of variable interests 4,800 4,600
Restricted cash and cash equivalents $ 0 $ 0