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Securitizations and Variable Interest Entities - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | $ 191,711 | $ 191,836 | $ 192,670
Carrying value of total liabilities | 176,594 | 177,933 |
Assets sold to nonconsolidated VIEs | 3,057 | 2,971 |
Maximum exposure to loss in nonconsolidated VIEs | 6,696 | 6,545 |
Non-recourse debt | 16,749 | 17,495 |
Held-to-maturity securities | 4,433 | 4,346 |
Other assets | 10,695 | 10,660 |
Equity securities | 865 | 871 |
Variable Interest Entity |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 14,406 | 15,681 |
Carrying value of total liabilities | 1,911 | 2,705 |
On‑balance sheet variable interest entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 2,812 | 4,666 |
Carrying value of total liabilities | 914 | 1,565 |
Non-recourse debt | 912 | 1,561 |
Other assets | 248 | 333 |
On‑balance sheet variable interest entities | Consumer | Automotive |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 11,560 | 12,821 |
Carrying value of total liabilities | 1,054 | 1,683 |
Assets sold to nonconsolidated VIEs | 0 | 0 |
Maximum exposure to loss in nonconsolidated VIEs | 0 | 0 |
Assets held-in-trust | 8,700 | 8,200 |
On‑balance sheet variable interest entities | Consumer | Automotive | Nonrecourse |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse debt | 140 | 118 |
Off-balance sheet variable interest entities | Consumer | Automotive |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 61 | 92 |
Carrying value of total liabilities | 0 | 0 |
Assets sold to nonconsolidated VIEs | 3,057 | 2,885 |
Maximum exposure to loss in nonconsolidated VIEs | 3,118 | 2,977 |
Held-to-maturity securities | 58 | 88 |
Other assets | 3 | 4 |
Off-balance sheet variable interest entities | Consumer | Other |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets |  | 0 |
Carrying value of total liabilities |  | 0 |
Assets sold to nonconsolidated VIEs |  | 86 |
Maximum exposure to loss in nonconsolidated VIEs |  | 86 |
Off-balance sheet variable interest entities | Commercial | Other |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 2,785 | 2,768 |
Carrying value of total liabilities | 857 | 1,022 |
Assets sold to nonconsolidated VIEs | 0 | 0 |
Maximum exposure to loss in nonconsolidated VIEs | 3,578 | 3,482 |
Equity securities | $ 54 | $ 50 |

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