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Debt (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Face amount of eligible notes from Charge Trust $ 3,000.0    
Debt (Textuals) [Abstract]      
Total bank lines of credit of the company 3,500.0 $ 3,000.0  
Unutilized total credit lines 3,500.0 3,000.0  
Fees to maintain credit lines $ 16.3 11.5  
Ratio of combined earnings and fixed earnings to fixed charges required to maintain availability of credit line 1.25    
Total Interest Paid $ 2,000.0 1,700.0 $ 1,600.0
Average Commercial Paper Outstanding 1,076.0 $ 491.0  
American Express Charge Trust II [Member]      
Debt Instrument [Line Items]      
Face amount of eligible notes draw downs $ 3,000.0    
Specified date face amount of eligible notes issued Jul. 15, 2020    
American Express Lending Trust [Member]      
Debt Instrument [Line Items]      
Specified date face amount of eligible notes issued Sep. 15, 2020    
Fixed Rate Subordinated Note [Member] | American Express Lending Trust [Member]      
Debt Instrument [Line Items]      
Year-End Stated Rate on Debt 2.21%