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Fair Values (Details 2) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Card Member receivables    
Fair Values (Textuals)    
Financing receivables, gross $ 57,613 $ 53,645
Card Member loans    
Fair Values (Textuals)    
Financing receivables, gross 107,964 88,562
Variable Interest Entity, Primary Beneficiary | Card Member receivables    
Fair Values (Textuals)    
Financing receivables, gross 5,193 5,175
Variable Interest Entity, Primary Beneficiary | Card Member loans    
Fair Values (Textuals)    
Financing receivables, gross 28,461 26,587
Reported Value Measurement    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 34,000 22,000
Other financial assets 60,000 56,000
Financial assets carried at other than fair value    
Loans, net 110,000 88,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 123,000 105,000
Financial liabilities carried at other than fair value    
Long-term debt 43,000 39,000
Reported Value Measurement | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 16,000 5,000
Estimate of Fair Value Measurement    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 34,000 22,000
Other financial assets 60,000 56,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 123,000 105,000
Estimate of Fair Value Measurement | Variable Interest Entity, Primary Beneficiary | Card Member receivables    
Fair Values (Textuals)    
Financing receivables, gross 5,200 5,200
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1    
Financial assets for which carrying values equal or approximate fair value    
Cash and cash equivalents 32,000 20,000
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 | 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 60,000 56,000
Financial Liabilities:    
Financial liabilities for which carrying values equal or approximate fair value 123,000 105,000
Estimate of Fair Value Measurement | 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    
Loans, net 113,000 91,000
Financial liabilities carried at other than fair value    
Long-term debt 42,000 40,000
Portion at Other than Fair Value Measurement | Certificates of deposit    
Financial liabilities carried at other than fair value    
Financial liabilities 16,000 5,000
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary    
Financial liabilities carried at other than fair value    
Long-term debt 12,300 13,900
Portion at Other than Fair Value Measurement | Variable Interest Entity, Primary Beneficiary | Card Member loans    
Fair Values (Textuals)    
Financing receivables, gross 28,400 26,700
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 1    
Financial assets carried at other than fair value    
Loans, net 0 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 2    
Financial assets carried at other than fair value    
Loans, net 0 0
Financial liabilities carried at other than fair value    
Long-term debt 42,000 40,000
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 16,000 5,000
Portion at Other than Fair Value Measurement | Fair Value, Inputs, Level 3    
Financial assets carried at other than fair value    
Loans, net 113,000 91,000
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