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Loan Receivables and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss $ 8,651 $ 9,901 $ 8,688 $ 10,265
Provision for credit losses 521 334    
Gross charge-offs (752) (925)    
Recoveries 194 226    
Other 0 1    
Credit cards        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss 8,464 9,735 8,512 10,076
Provision for credit losses 482 341    
Gross charge-offs (719) (901)    
Recoveries 189 219    
Other 0 0    
Consumer installment loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss 115 100 115 127
Provision for credit losses 17 (18)    
Gross charge-offs (21) (15)    
Recoveries 4 5    
Other 0 1    
Commercial credit products        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss 70 64 59 61
Provision for credit losses 22 10    
Gross charge-offs (12) (9)    
Recoveries 1 2    
Other 0 0    
Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Allowance for Credit Loss 2 2 $ 2 $ 1
Provision for credit losses 0 1    
Gross charge-offs 0 0    
Recoveries 0 0    
Other $ 0 $ 0