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Fair Values (Details 2) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Card Member Receivables    
Fair Values (Textuals)    
Financing receivables, gross $ 53,164 $ 53,645
Card Member Loans    
Fair Values (Textuals)    
Financing receivables, gross 88,832 88,562
Variable Interest Entity, Primary Beneficiary | Card Member Receivables    
Fair Values (Textuals)    
Financing receivables, gross 5,640 5,175
Variable Interest Entity, Primary Beneficiary | Card Member Loans    
Fair Values (Textuals)    
Financing receivables, gross 26,017 26,587
Carrying Value    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 28,000 22,000
Other financial assets 56,000 56,000
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 89,000 88,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 110,000 105,000
Financial liabilities carried at other than fair value    
Certificates of deposit 5,000 5,000
Long-term debt 38,000 39,000
Fair Values (Textuals)    
Long-term debt 38,000 39,000
Corresponding Fair Value Amount    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 28,000 22,000
Other financial assets 56,000 56,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 110,000 105,000
Corresponding Fair Value Amount | Variable Interest Entity, Primary Beneficiary | Card Member Receivables    
Fair Values (Textuals)    
Financing receivables, gross 5,600 5,200
Corresponding Fair Value Amount | Level 1    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 25,000 20,000
Other financial assets 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 3,000 2,000
Other financial assets 56,000 56,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 110,000 105,000
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 92,000 91,000
Financial liabilities carried at other than fair value    
Certificates of deposit 5,000 5,000
Long-term debt 39,000 40,000
Fair Values (Textuals)    
Long-term debt 39,000 40,000
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary    
Financial liabilities carried at other than fair value    
Long-term debt 11,700 13,900
Fair Values (Textuals)    
Long-term debt 11,700 13,900
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary | Card Member Loans    
Fair Values (Textuals)    
Financing receivables, gross 26,100 26,700
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 5,000
Long-term debt 39,000 40,000
Fair Values (Textuals)    
Long-term debt 39,000 40,000
Portion at Other than Fair Value Measurement | Level 3    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 92,000 91,000
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