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Sales of Receivables and Servicing Rights - Sensitivity of the Current Fair Value of Residual Cash Flows to Immediate 10%, 20% and 50% Adverse Changes in Assumptions (Details)
$ in Millions
9 Months Ended
Sep. 30, 2024
USD ($)
Fixed-rate  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption  
Fair Value $ 1,653
Weighted- Average Life (in years) 8 years 4 months 24 days
Prepayment Speed Assumption, Rate (as a percent) 6.70%
Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 10% $ (37)
Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 20% (74)
Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 50% $ (175)
OAS Speed Assumption, OAS (bps) 0.0470
OAS Spread Assumption, Impact of Adverse Change on Fair Value 10% $ (35)
OAS Spread Assumption, Impact of Adverse Change on Fair Value 20% (69)
Adjustable-rate  
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption  
Fair Value $ 3
Weighted- Average Life (in years) 3 years 10 months 24 days
Prepayment Speed Assumption, Rate (as a percent) 22.00%
Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 10% $ 0
Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 20% 0
Prepayment Speed Assumption, Impact of Adverse Change on Fair Value 50% $ (1)
OAS Speed Assumption, OAS (bps) 0.0696
OAS Spread Assumption, Impact of Adverse Change on Fair Value 10% $ 0
OAS Spread Assumption, Impact of Adverse Change on Fair Value 20% $ 0