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Securitizations and Variable Interest Entities - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | $ 193,331 | $ 191,836 | $ 192,800
Carrying value of total liabilities | 179,099 | 177,933 |
Assets sold to nonconsolidated VIEs | 2,867 | 2,971 |
Maximum exposure to loss in nonconsolidated VIEs | 6,462 | 6,545 |
Non-recourse debt | 16,465 | 17,495 |
Held-to-maturity securities | 4,668 | 4,346 |
Other assets | 11,545 | 10,660 |
Equity securities | 942 | 871 |
On‑balance sheet variable interest entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 3,994 | 4,666 |
Carrying value of total liabilities | 1,363 | 1,565 |
Non-recourse debt | 1,360 | 1,561 |
Other assets | 311 | 333 |
On‑balance sheet variable interest entities | Consumer | Automotive |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 12,043 | 12,821 |
Carrying value of total liabilities | 1,485 | 1,683 |
Assets sold to nonconsolidated VIEs | 0 | 0 |
Maximum exposure to loss in nonconsolidated VIEs | 0 | 0 |
Assets held-in-trust | 8,100 | 8,200 |
On‑balance sheet variable interest entities | Consumer | Automotive | Nonrecourse |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-recourse debt | 122 | 118 |
Off-balance sheet variable interest entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 14,953 | 15,681 |
Carrying value of total liabilities | 2,508 | 2,705 |
Off-balance sheet variable interest entities | Consumer | Automotive |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 81 | 92 |
Carrying value of total liabilities | 0 | 0 |
Assets sold to nonconsolidated VIEs | 2,790 | 2,885 |
Maximum exposure to loss in nonconsolidated VIEs | 2,871 | 2,977 |
Held-to-maturity securities | 77 | 88 |
Other assets | 4 | 4 |
Off-balance sheet variable interest entities | Consumer | Other |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 0 | 0 |
Carrying value of total liabilities | 0 | 0 |
Assets sold to nonconsolidated VIEs | 77 | 86 |
Maximum exposure to loss in nonconsolidated VIEs | 77 | 86 |
Off-balance sheet variable interest entities | Commercial | Other |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value of total assets | 2,829 | 2,768 |
Carrying value of total liabilities | 1,023 | 1,022 |
Assets sold to nonconsolidated VIEs | 0 | 0 |
Maximum exposure to loss in nonconsolidated VIEs | 3,514 | 3,482 |
Equity securities | $ 49 | $ 50 |

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