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Fair Values (Details 2) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Portion at Other than Fair Value Measurement [Member]    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves $ 73,000 $ 91,000
Financial liabilities carried at other than fair value    
Certificates of deposit 11,000 10,000
Long-term debt 51,000 60,000
Portion at Other than Fair Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Financial liabilities carried at other than fair value    
Long-term debt 14,900 19,800
Fair Values (Textuals)    
Card Member loans, net 25,400 32,000
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 0 0
Financial liabilities carried at other than fair value    
Certificates of deposit 0 0
Long-term debt 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 and Other loans, less reserves 0 0
Financial liabilities carried at other than fair value    
Certificates of deposit 11,000 10,000
Long-term debt 51,000 60,000
Portion at Other than Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 73,000 91,000
Financial liabilities carried at other than fair value    
Certificates of deposit 0 0
Long-term debt 0 0
Fair Values (Textuals)    
Card Member receivables 37,553 57,413
Card Member loans, net 64,431 84,998
Variable Interest Entity, Primary Beneficiary [Member]    
Fair Values (Textuals)    
Card Member receivables 4,042 8,284
Reported Value Measurement [Member]    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 41,000 24,000
Other financial assets 40,000 60,000
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 69,000 90,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 92,000 92,000
Financial liabilities carried at other than fair value    
Certificates of deposit 11,000 10,000
Long-term debt 49,000 58,000
Estimate of Fair Value Measurement [Member]    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 41,000 24,000
Other financial assets 40,000 60,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 92,000 92,000
Estimate of Fair Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Fair Values (Textuals)    
Card Member receivables 3,900 8,200
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 40,000 23,000
Other financial assets 0 0
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 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 1,000 1,000
Other financial assets 40,000 60,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 92,000 92,000
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 0 0
Other financial assets 0 0
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value $ 0 $ 0