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Fair Values (Details 2) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Portion at Other than Fair Value Measurement [Member]        
Financial assets carried at other than fair value        
Card Member loans, less reserves for credit losses $ 81,000 $ 91,000    
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]        
Financial assets carried at other than fair value        
Card Member loans, less reserves for credit losses 0 0    
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]        
Financial assets carried at other than fair value        
Card Member loans, less reserves for credit losses 0 0    
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]        
Financial assets carried at other than fair value        
Card Member loans, less reserves for credit losses 81,000 91,000    
Cash and cash equivalents per Consolidated Balance Sheets 36,095 23,932 $ 33,177 $ 27,445
Financial liabilities carried at other than fair value        
Certificates of deposit 11,088      
Long-term debt 52,588 57,835    
Fair Values (Textuals)        
Accounts receivable, less reserves 44,269 56,794    
Card Member loans, net 72,464 84,998    
Variable Interest Entity, Primary Beneficiary [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 16,275 19,668    
Reported Value Measurement [Member]        
Financial assets for which carrying values equal or approximate fair value        
Cash and cash equivalents per Consolidated Balance Sheets 36,000 24,000    
Other financial assets 49,000 60,000    
Financial assets carried at other than fair value        
Card Member loans, less reserves for credit losses 77,000 90,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 86,000 92,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 11,000 10,000    
Long-term debt 53,000 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 36,000 24,000    
Other financial assets 49,000 60,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 86,000 92,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 11,000 10,000    
Long-term debt 53,000 60,000    
Estimate of Fair Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]        
Financial liabilities carried at other than fair value        
Long-term debt 16,400 19,800    
Fair Values (Textuals)        
Accounts receivable, less reserves 3,800 8,200    
Card Member loans, net 27,700 32,000    
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 35,000 23,000    
Other financial assets 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 49,000 60,000    
Financial Liabilities:        
Financial liabilities for which carrying values equal or approximate fair value 86,000 92,000    
Financial liabilities carried at other than fair value        
Certificates of deposit 11,000 10,000    
Long-term debt 53,000 60,000    
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 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