Borrowings - Additional Information (Detail) - USD ($) |
1 Months Ended | ||
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Apr. 30, 2026 |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Debt Instrument [Line Items] | |||
| Credit facility drawn | $ 4,600,000,000 | ||
| Face amount | 2,779,000,000 | $ 1,730,000,000 | |
| Senior notes | 3,142,000,000 | 1,946,000,000 | |
| M&T | |||
| Debt Instrument [Line Items] | |||
| Senior notes | 5,497,000,000 | $ 5,583,000,000 | |
| FHLB Facility | |||
| Debt Instrument [Line Items] | |||
| Maximum borrowing capacity | 20,000,000,000.0 | ||
| Subordinated Debt | |||
| Debt Instrument [Line Items] | |||
| Face amount | $ 1,200,000,000 | ||
| Debt instrument, interest rate, stated percentage | 4.548% | ||
| Variable rate | 0.94% | ||
| Subordinated Debt | M&T | |||
| Debt Instrument [Line Items] | |||
| Face amount | $ 500,000,000 | ||
| Debt instrument, interest rate, stated percentage | 5.295% | ||
| Term (in years) | 5 years | ||
| Variable rate | 1.38% | ||
| FRB of New York | |||
| Debt Instrument [Line Items] | |||
| Available line of credit | $ 26,100,000,000 |
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available.
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- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. No definition available.
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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