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Fair Values (Details 2) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Card Member Receivables    
Fair Values (Textuals)    
Financing receivables, gross $ 48,758 $ 43,701
Card Member Loans    
Fair Values (Textuals)    
Financing receivables, gross 77,026 73,373
Variable Interest Entity, Primary Beneficiary | Card Member Receivables    
Fair Values (Textuals)    
Financing receivables, gross 5,101 4,296
Variable Interest Entity, Primary Beneficiary | Card Member Loans    
Fair Values (Textuals)    
Financing receivables, gross 24,675 25,908
Carrying Value    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 28,000 33,000
Other financial assets 51,000 46,000
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 76,000 71,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 103,000 101,000
Financial liabilities carried at other than fair value    
Certificates of deposit 5,000 8,000
Long-term debt 34,000 43,000
Fair Values (Textuals)    
Long-term debt 34,000 43,000
Corresponding Fair Value Amount    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 28,000 33,000
Other financial assets 51,000 46,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 103,000 101,000
Corresponding Fair Value Amount | Variable Interest Entity, Primary Beneficiary | Card Member Receivables    
Fair Values (Textuals)    
Financing receivables, gross 5,100 4,200
Corresponding Fair Value Amount | Level 1    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 26,000 31,000
Other financial assets 0 0
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 0 0
Corresponding Fair Value Amount | Level 2    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 2,000 2,000
Other financial assets 51,000 46,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 103,000 101,000
Corresponding Fair Value Amount | Level 3    
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
Portion at Other than Fair Value Measurement    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 79,000 75,000
Financial liabilities carried at other than fair value    
Certificates of deposit 5,000 8,000
Long-term debt 36,000 45,000
Fair Values (Textuals)    
Long-term debt 36,000 45,000
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary    
Financial liabilities carried at other than fair value    
Long-term debt 9,200 13,000
Fair Values (Textuals)    
Long-term debt 9,200 13,000
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary | Card Member Loans    
Fair Values (Textuals)    
Financing receivables, gross 24,700 25,800
Portion at Other than Fair Value Measurement | Level 1    
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
Fair Values (Textuals)    
Long-term debt 0 0
Portion at Other than Fair Value Measurement | Level 2    
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 5,000 8,000
Long-term debt 36,000 45,000
Fair Values (Textuals)    
Long-term debt 36,000 45,000
Portion at Other than Fair Value Measurement | Level 3    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 79,000 75,000
Financial liabilities carried at other than fair value    
Certificates of deposit 0 0
Long-term debt 0 0
Fair Values (Textuals)    
Long-term debt $ 0 $ 0