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Securitization Activities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Assets securitized in a non-cash exchange for loans and investments $ 209 $ 120 $ 552 $ 250  
Retained Interests 7,240   7,240   $ 5,848
Notional amount related to other continuing involvement 3,830   3,830   2,780
Seller financing related to loans sold     340 1,730  
Loans sold     425 3,930  
Proceeds from collection of finance receivables 129 $ 1,430 499 $ 2,110  
Outstanding Principal Amount 172,984   172,984   138,739
Retained interest 7,190   7,190   5,780
Corporate debt and other asset-backed          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Retained Interests 500   500   493
Outstanding Principal Amount 13,228   13,228   12,059
Corporate debt and other asset-backed | Installment          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Outstanding Principal Amount 1,250   1,250   1,320
Derivatives And Commitments          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Retained Interests 1,180   1,180   847
Other retained interests          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Retained interest 487   $ 487   $ 491
Weighted average life (years)     4 years 10 months 24 days   5 years
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Other Assumption $ 500   $ 500   $ 493