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Asset Securitizations (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Assets from Trusts [Line Items]        
Restricted balances included in Cash and cash equivalents $ 475 $ 606 $ 2,597 $ 514
American Express Lending Trust        
Assets from Trusts [Line Items]        
Direct and Indirect ownership of variable interests 15,800 13,400    
Restricted balances included in Cash and cash equivalents 25 47    
American Express Charge Trust        
Assets from Trusts [Line Items]        
Direct and Indirect ownership of variable interests 5,100 4,300    
Restricted balances included in Cash and cash equivalents $ 0 $ 0