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Fair Values (Details 2) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets $ 29,743 $ 32,927 $ 30,442 $ 25,208
Financial liabilities carried at other than fair value        
Certificates of deposit 16,704      
Long-term debt 55,883 55,804    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 54,424 53,526    
Card Member loans, net 73,579 71,693    
Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 19,321 18,560    
Carrying Value [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 30,000 33,000    
Other financial assets 59,000 57,000    
Financial assets carried at other than fair value        
Loans, Net 77,000 74,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 77,000 76,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 17,000 17,000    
Long-term debt 56,000 56,000    
Estimate of Fair Value, Fair Value Disclosure [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 30,000 33,000    
Other financial assets 59,000 57,000    
Financial assets carried at other than fair value        
Loans, Net 77,000 75,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 77,000 76,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 16,000 17,000    
Long-term debt 57,000 57,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 19,200 18,600    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 7,900 8,900    
Card Member loans, net 23,900 25,600    
Level 1 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 29,000 32,000    
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 per Consolidated Balance Sheets 1,000 1,000    
Other financial assets 59,000 57,000    
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 77,000 76,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 16,000 17,000    
Long-term debt 57,000 57,000    
Level 3 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 0 0    
Other financial assets 0 0    
Financial assets carried at other than fair value        
Loans, Net 77,000 75,000    
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