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Fair Values (Details 2) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents $ 25,208 $ 22,762 $ 22,288 $ 19,486
Financial liabilities carried at other than fair value        
Certificates of deposit 12,231      
Long-term debt 46,990 48,061    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 46,841 43,671    
Card Member loans, net 64,042 57,545    
Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 15,113 13,602    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 8,800 6,700    
Carrying Value [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 25,000 23,000    
Other financial assets 51,000 47,000    
Financial assets carried at other than fair value        
Loans, net 65,000 59,000    
Receivables Held For Sale Amount   15,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 67,000 67,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 12,000 14,000    
Long-term debt 47,000 48,000    
Estimate of Fair Value, Fair Value Disclosure [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 25,000 23,000    
Other financial assets 51,000 47,000    
Financial assets carried at other than fair value        
Loans, net 66,000 60,000    
Receivables Held For Sale Amount   15,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 67,000 67,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 12,000 14,000    
Long-term debt 48,000 49,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 15,200 13,600    
Fair Values (Textuals) [Abstract]        
Card Member loans, net 26,000 23,500    
Level 1 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 22,000 22,000    
Other financial assets 0 0    
Financial assets carried at other than fair value        
Loans, net 0 0    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 0 0    
Financial liabilities carried at other than fair value        
Certificates of deposit 0 0    
Long-term debt 0 0    
Level 2 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 3,000 1,000    
Other financial assets 51,000 47,000    
Financial assets carried at other than fair value        
Loans, net 0 0    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 67,000 67,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 12,000 14,000    
Long-term debt 48,000 49,000    
Level 3 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 0 0    
Other financial assets 0 0    
Financial assets carried at other than fair value        
Loans, net 66,000 60,000    
Receivables Held For Sale Amount   15,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 0 0    
Financial liabilities carried at other than fair value        
Certificates of deposit 0 0    
Long-term debt $ 0 $ 0