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Fair Values (Details 2) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents $ 33,767 $ 22,762 $ 21,071 $ 22,288
Financial assets carried at other than fair value        
Card Member loans and receivables HFS 0 14,992    
Financial liabilities carried at other than fair value        
Certificates of deposit 13,757      
Long-term debt 50,649 48,061    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 44,800 43,671    
Card Member loans, net 58,796 57,545    
Variable Interest Enterprise [Member]        
Financial assets carried at other than fair value        
Card Member loans and receivables HFS 0 4,966    
Financial liabilities carried at other than fair value        
Long-term debt 14,609 13,602    
Carrying Value [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 34,000 23,000    
Other financial assets 48,000 47,000    
Financial assets carried at other than fair value        
Loans, net 60,000 59,000    
Card Member loans and receivables HFS 0 15,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 63,000 67,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 14,000 14,000    
Long-term debt 51,000 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 34,000 23,000    
Other financial assets 48,000 47,000    
Financial assets carried at other than fair value        
Loans, net 61,000 60,000    
Card Member loans and receivables HFS 0 15,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 63,000 67,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 14,000 14,000    
Long-term debt 52,000 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 14,700 13,600    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 5,800 6,700    
Card Member loans, net 25,300 23,500    
Level 1 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents 33,000 22,000    
Other financial assets 0 0    
Financial assets carried at other than fair value        
Loans, net 0 0    
Card Member loans and receivables HFS 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 48,000 47,000    
Financial assets carried at other than fair value        
Loans, net 0 0    
Card Member loans and receivables HFS 0 0    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 63,000 67,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 14,000 14,000    
Long-term debt 52,000 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 61,000 60,000    
Card Member loans and receivables HFS 0 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