v3.24.4
Loan Receivables (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of loan portfolio segments (in segments) | segment       2      
Allowance for credit losses $ 7,374     $ 9,283 $ 7,374 $ 6,822 $ 8,226
Allowance for credit loss, period increase (decrease)       $ 1,900      
Expected future unemployment rate       4.17%      
Expected future peak unemployment rate       4.26%      
Expected future increase in GDP       1.36%      
Financing receivable, allowance for credit loss, reasonable and supportable forecast period 18 months 18 months 18 months 18 months      
Financing receivable, allowance for credit loss, reversion period       12 months 12 months    
Percentage of defaulted loans that were charged off at the end of the month in which they defaulted (in percent)         65.00%    
Minimum [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Delinquent loan qualification period       30 days      
Credit Card Loans [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for credit losses $ 5,883     $ 7,619 $ 5,883 5,273 6,491
Temporary reduced payment program, maximum period of payment reduction       12 months      
Permanent workout program, maturity       72 months      
Financing Receivable, Modified in Period, Accrued Interest, Amount       $ 117 29    
Total Other Loans [Member] | Private Student Loans [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for credit losses 839     $ 858 839 843 840
Loan Modification Program Maximum Consecutive Months       6 months      
Temporary Loan Modification Common Maximum       12 months      
Total Other Loans [Member] | Personal Loans [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for credit losses $ 595     $ 722 $ 595 $ 662 $ 857
Temporary reduced payment program, maximum period of payment reduction       12 months      
Maximum repayment term for permanent modification programs (in years)       9 years