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Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Loss on securitization of assets |  |  | $ 0 |  |  |
Asset-backed notes | $ 822,000,000 |  | 822,000,000 |  |  | $ 474,000,000
Loans | 132,798,000,000 |  | 132,798,000,000 |  |  | 131,939,000,000
Other assets for its "investment" in the common securities recognized by the company of various trusts | 22,000,000 |  | 22,000,000 |  |  | 22,000,000
Total assets of partnerships in which the company invested | 208,855,000,000 |  | 208,855,000,000 |  |  | 208,264,000,000
Secured Debt |  |  |  |  |  |
Asset-backed notes | 457,000,000 |  | 457,000,000 |  | $ 526,000,000 |
Long-term debt term (in years) |  |  |  |  | 2 years |
Loans and leases average rate |  |  |  |  | 5.29% |
Secured Debt | Third Party Investors |  |  |  |  |  |
Asset-backed notes | 446,000,000 |  | 446,000,000 |  | $ 511,000,000 |
Secured Debt | M&T Bank |  |  |  |  |  |
Asset-backed notes |  |  |  |  | $ 15,000,000 |
Variable Interest Entity Primary Beneficiary |  |  |  |  |  |
Total assets of partnerships in which the company invested | 9,500,000,000 |  | 9,500,000,000 |  |  | $ 9,800,000,000
Federal tax credits and other federal tax benefits recognized | 8,000,000 | $ 10,000,000 | 15,000,000 | $ 16,000,000 |  |
Investments amortized to income tax expense | 45,000,000 | 41,000,000 | 88,000,000 | 82,000,000 |  |
Maximum exposure to loss of investments in real estate partnerships | 2,200,000,000 |  | 2,200,000,000 |  |  |
Variable Interest Entity Primary Beneficiary | Renewable Energy |  |  |  |  |  |
Federal tax credits and other federal tax benefits recognized | 9,000,000 | 4,000,000 | 9,000,000 | 4,000,000 |  |
Investments amortized to income tax expense | $ 20,000,000 | $ 12,000,000 | $ 20,000,000 | $ 12,000,000 |  |

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