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Fair Values (Details 2) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets $ 27,445 $ 32,927 $ 25,208 $ 23,239
Financial assets carried at other than fair value        
Other loans, net 3,676 2,607    
Financial liabilities carried at other than fair value        
Certificates of deposit 13,502      
Long-term debt 58,423 55,804    
Fair Values (Textuals) [Abstract]        
Accounts receivable, less reserves 55,320 53,526    
Card Member loans, net 79,720 71,693    
Card Member receivables, gross 55,893 54,047    
Variable Interest Enterprise [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 19,509 18,560    
Fair Values (Textuals) [Abstract]        
Card Member receivables, gross 8,539 8,919    
Carrying Value [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 27,000 33,000    
Other financial assets 58,000 57,000    
Financial assets carried at other than fair value        
Other loans, net 83,000 74,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 81,000 76,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 13,000 17,000    
Long-term debt 58,000 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 27,000 33,000    
Other financial assets 58,000 57,000    
Financial assets carried at other than fair value        
Other loans, net 84,000 75,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 81,000 76,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 13,000 17,000    
Long-term debt 59,000 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 19,400 18,600    
Fair Values (Textuals) [Abstract]        
Card Member loans, net 33,000 25,600    
Level 1 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 26,000 32,000    
Other financial assets 0 0    
Financial assets carried at other than fair value        
Other 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 58,000 57,000    
Financial assets carried at other than fair value        
Other loans, net 0 0    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 81,000 76,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 13,000 17,000    
Long-term debt 59,000 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        
Other loans, net 84,000 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