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Fair Values (Details 2) - USD ($)
$ in Millions
Sep. 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 $ 72,000 $ 91,000
Financial liabilities carried at other than fair value    
Certificates of deposit 10,000 10,000
Long-term debt 47,000 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 25,100 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 10,000 10,000
Long-term debt 47,000 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 72,000 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 40,811 57,413
Variable Interest Entity, Primary Beneficiary [Member]    
Fair Values (Textuals)    
Card Member receivables 4,247 8,284
Reported Value Measurement [Member]    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 33,000 24,000
Other financial assets 45,000 60,000
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 67,000 90,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 95,000 92,000
Financial liabilities carried at other than fair value    
Certificates of deposit 9,000 10,000
Long-term debt 45,000 58,000
Estimate of Fair Value Measurement [Member]    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 33,000 24,000
Other financial assets 45,000 60,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 95,000 92,000
Estimate of Fair Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]    
Fair Values (Textuals)    
Card Member receivables 4,200 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 32,000 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 45,000 60,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 95,000 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