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Fair Values (Details 2) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets $ 24,266 $ 27,445 $ 30,231 $ 32,927
Financial liabilities carried at other than fair value        
Certificates of deposit 11,369      
Long-term debt 58,474 58,423    
Fair Values (Textuals)        
Accounts receivable, less reserves 56,010 55,320    
Card Member loans, net 81,423 79,720    
Variable Interest Entity, Primary Beneficiary [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 20,235 19,509    
Reported Value Measurement [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 24,000 27,000    
Other financial assets 60,000 58,000    
Financial assets carried at other than fair value        
Loans, Net 86,000 83,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 86,000 81,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 11,000 13,000    
Long-term debt 58,000 58,000    
Estimate of Fair Value Measurement [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 24,000 27,000    
Other financial assets 60,000 58,000    
Financial assets carried at other than fair value        
Loans, Net 87,000 84,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 86,000 81,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 11,000 13,000    
Long-term debt 60,000 59,000    
Estimate of Fair Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 20,400 19,400    
Fair Values (Textuals)        
Accounts receivable, less reserves 7,500 8,500    
Card Member loans, net 31,000 33,000    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 23,000 26,000    
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    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, 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 60,000 58,000    
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 86,000 81,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 11,000 13,000    
Long-term debt 60,000 59,000    
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, 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 87,000 84,000    
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