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Acquisitions and Divestitures Textual ( Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Events Textuals [Abstract]      
Card Member loans and receivables held for sale $ 0 $ 14,992  
CardMember Receivables And Loans Reserves 0 224 $ 0
Total Impairment Charge 0 384 0
Impairment Of Goodwill Prepaid Services   219  
Impairment Charge - Technology And Other Assets writedown to Fair Value   165  
Gain on sale of HFS Portfolios (1,218) 0 0
Gain on business travel joint venture transaction 0 $ 0 $ 630
Costco [Member] | Other Expense [Member]      
Business Events Textuals [Abstract]      
Gain on sale of HFS Portfolios (1,091)    
JetBlue [Member] | Other Expense [Member]      
Business Events Textuals [Abstract]      
Gain on sale of HFS Portfolios $ (127)