v3.26.1
Fair Values - Not Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Card Balances    
Fair Values (Textuals)    
Financing receivables, gross $ 213,311 $ 213,863
Variable Interest Entity, Primary Beneficiary | Card Balances    
Fair Values (Textuals)    
Financing receivables, gross 33,386 33,378
Carrying Value    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 54,000 48,000
Other financial assets 5,000 4,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 172,000 166,000
Financial liabilities carried at other than fair value    
Long-term debt 58,000 56,000
Fair Values (Textuals)    
Long-term debt 58,000 56,000
Carrying Value | Card Balances and Other Loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 218,000 218,000
Carrying Value | Card Member Loans, Held-for-Sale    
Financial assets carried at other than fair value    
Card balances HFS 2,000 2,000
Carrying Value | Certificates of Deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 17,000 16,000
Corresponding Fair Value Amount    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 54,000 48,000
Other financial assets 5,000 4,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 172,000 166,000
Corresponding Fair Value Amount | Level 1    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 52,000 46,000
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 5,000 4,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 172,000 166,000
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 liabilities carried at other than fair value    
Long-term debt 59,000 57,000
Fair Values (Textuals)    
Long-term debt 59,000 57,000
Portion at Other than Fair Value Measurement | Card Balances and Other Loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 223,000 224,000
Portion at Other than Fair Value Measurement | Card Member Loans, Held-for-Sale    
Financial assets carried at other than fair value    
Card balances HFS 2,000 2,000
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary    
Financial liabilities carried at other than fair value    
Long-term debt 13,400 13,300
Fair Values (Textuals)    
Long-term debt 13,400 13,300
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary | Card Balances    
Fair Values (Textuals)    
Financing receivables, gross 33,300 33,200
Portion at Other than Fair Value Measurement | Certificates of Deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 17,000 16,000
Portion at Other than Fair Value Measurement | Level 1    
Financial liabilities carried at other than fair value    
Long-term debt 0 0
Fair Values (Textuals)    
Long-term debt 0 0
Portion at Other than Fair Value Measurement | Level 1 | Card Balances and Other Loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 0 0
Portion at Other than Fair Value Measurement | Level 1 | Card Member Loans, Held-for-Sale    
Financial assets carried at other than fair value    
Card balances HFS 0 0
Portion at Other than Fair Value Measurement | Level 1 | Certificates of Deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 0 0
Portion at Other than Fair Value Measurement | Level 2    
Financial liabilities carried at other than fair value    
Long-term debt 59,000 57,000
Fair Values (Textuals)    
Long-term debt 59,000 57,000
Portion at Other than Fair Value Measurement | Level 2 | Card Balances and Other Loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 0 0
Portion at Other than Fair Value Measurement | Level 2 | Card Member Loans, Held-for-Sale    
Financial assets carried at other than fair value    
Card balances HFS 0 0
Portion at Other than Fair Value Measurement | Level 2 | Certificates of Deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 17,000 16,000
Portion at Other than Fair Value Measurement | Level 3    
Financial liabilities carried at other than fair value    
Long-term debt 0 0
Fair Values (Textuals)    
Long-term debt 0 0
Portion at Other than Fair Value Measurement | Level 3 | Card Balances and Other Loans    
Financial assets carried at other than fair value    
Card Member and Other loans, less reserves 223,000 224,000
Portion at Other than Fair Value Measurement | Level 3 | Card Member Loans, Held-for-Sale    
Financial assets carried at other than fair value    
Card balances HFS 2,000 2,000
Portion at Other than Fair Value Measurement | Level 3 | Certificates of Deposit    
Financial liabilities carried at other than fair value    
Financial liabilities $ 0 $ 0