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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

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- Definition Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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