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Fair Values - Not Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Card Member loans    
Fair Values (Textuals)    
Financing receivables, gross $ 139,674 $ 125,995
Card Member receivables    
Fair Values (Textuals)    
Financing receivables, gross 59,411 60,411
Variable Interest Entity, Primary Beneficiary | Card Member loans    
Fair Values (Textuals)    
Financing receivables, gross 28,278 28,590
Variable Interest Entity, Primary Beneficiary | Card Member receivables    
Fair Values (Textuals)    
Financing receivables, gross 3,927 4,587
Carrying Value    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 41,000 47,000
Other financial assets 63,000 63,000
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves   128,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 155,000 143,000
Financial liabilities carried at other than fair value    
Long-term debt 50,000 48,000
Carrying Value | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 12,000 19,000
Carrying Value | Card Member loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 143,000  
Carrying Value | Card Member loans HFS    
Financial assets carried at other than fair value    
Card Member loans HFS 1,000  
Corresponding Fair Value Amount    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 41,000 47,000
Other financial assets 63,000 63,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 155,000 143,000
Corresponding Fair Value Amount | Variable Interest Entity, Primary Beneficiary | Card Member receivables    
Fair Values (Textuals)    
Financing receivables, gross 3,900 4,600
Corresponding Fair Value Amount | Fair Value, Inputs, Level 1    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 39,000 45,000
Other financial assets 0 0
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 0 0
Corresponding Fair Value Amount | Fair Value, Inputs, Level 2    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 2,000 2,000
Other financial assets 63,000 63,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 155,000 143,000
Corresponding Fair Value Amount | Fair Value, Inputs, 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   133,000
Financial liabilities carried at other than fair value    
Long-term debt 50,000 48,000
Portion at Other than Fair Value Measurement | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 12,000 18,000
Portion at Other than Fair Value Measurement | Card Member loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 149,000  
Portion at Other than Fair Value Measurement | Card Member loans HFS    
Financial assets carried at other than fair value    
Card Member loans HFS 1,000  
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary    
Financial liabilities carried at other than fair value    
Long-term debt 14,000 13,300
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary | Card Member loans    
Fair Values (Textuals)    
Financing receivables, gross 28,300 28,600
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 1    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves   0
Financial liabilities carried at other than fair value    
Long-term debt 0 0
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 1 | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 0 0
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 1 | Card Member loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 0  
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 1 | Card Member loans HFS    
Financial assets carried at other than fair value    
Card Member loans HFS 0  
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 2    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves   0
Financial liabilities carried at other than fair value    
Long-term debt 50,000 48,000
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 2 | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 12,000 18,000
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 2 | Card Member loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 0  
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 2 | Card Member loans HFS    
Financial assets carried at other than fair value    
Card Member loans HFS 0  
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 3    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves   133,000
Financial liabilities carried at other than fair value    
Long-term debt 0 0
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 3 | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 0 $ 0
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 3 | Card Member loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 149,000  
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 3 | Card Member loans HFS    
Financial assets carried at other than fair value    
Card Member loans HFS $ 1,000