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Fair Values (Details 2) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents $ 21,071 $ 22,288 $ 18,430 $ 19,486
Financial liabilities carried at other than fair value        
Certificates of deposit 9,733      
Long-term debt 52,740 57,955    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 44,459 44,386    
Card Member loans, net 67,823 69,184    
Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 16,423 19,516    
Carrying Value [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 21,000 22,000    
Other financial assets 49,000 48,000    
Financial assets carried at other than fair value        
Loans, net 69,000 70,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 62,000 61,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 10,000 8,000    
Long-term debt 53,000 58,000    
Estimate of Fair Value, Fair Value Disclosure [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 21,000 22,000    
Other financial assets 49,000 48,000    
Financial assets carried at other than fair value        
Loans, net 69,000 71,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 62,000 61,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 10,000 8,000    
Long-term debt 54,000 60,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 16,500 19,500    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 6,200 7,000    
Card Member loans, net 27,900 29,900    
Level 1 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 20,000 21,000    
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 1,000 1,000    
Other financial assets 49,000 48,000    
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 62,000 61,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 10,000 8,000    
Long-term debt 54,000 60,000    
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 69,000 71,000    
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