XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.25.2

Comprehensive income (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Equity [Abstract] |
Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income | The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income:
(Dollars in millions) | Investment Securities |  | Cash Flow Hedges |  | Defined Benefit Plans |  | Other |  | Total Amount Before Tax |  | Income Tax |  | Net
Balance — January 1, 2025 | $ | (205) |  |  | $ | (135) |  |  | $ | 131 |  |  | $ | (10) |  |  | $ | (219) |  |  | $ | 55 |  |  | $ | (164) |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains, net | 287 |  |  | — |  |  | — |  |  | — |  |  | 287 |  |  | (73) |  |  | 214 |
Unrealized gains on cash flow hedges | — |  |  | 134 |  |  | — |  |  | — |  |  | 134 |  |  | (34) |  |  | 100 |
Other | — |  |  | — |  |  | — |  |  | 5 |  |  | 5 |  |  | (1) |  |  | 4 |
Total other comprehensive income (loss) before reclassifications | 287 |  |  | 134 |  |  | — |  |  | 5 |  |  | 426 |  |  | (108) |  |  | 318 |
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net yield adjustment from cash flow hedges currently in effect | — |  |  | 86 |  |  | — |  |  | — |  |  | 86 |  | (a) | (22) |  |  | 64 |
Amortization of prior service credit | — |  |  | — |  |  | (1) |  |  | — |  |  | (1) |  | (b) | — |  |  | (1) |
Amortization of actuarial gains | — |  |  | — |  |  | (3) |  |  | — |  |  | (3) |  | (b) | 1 |  |  | (2) |
Total other comprehensive income (loss) | 287 |  |  | 220 |  |  | (4) |  |  | 5 |  |  | 508 |  |  | (129) |  |  | 379 |
Balance — June 30, 2025 | $ | 82 |  |  | $ | 85 |  |  | $ | 127 |  |  | $ | (5) |  |  | $ | 289 |  |  | $ | (74) |  |  | $ | 215 |
Balance — January 1, 2024 | $ | (251) |  |  | $ | (203) |  |  | $ | (155) |  |  | $ | (7) |  |  | $ | (616) |  |  | $ | 157 |  |  | $ | (459) |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding losses, net | (1) |  |  | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |  | (1) |
Unrealized losses on cash flow hedges | — |  |  | (313) |  |  | — |  |  | — |  |  | (313) |  |  | 78 |  |  | (235) |
Other | — |  |  | — |  |  | — |  |  | (2) |  |  | (2) |  |  | — |  |  | (2) |
Total other comprehensive income (loss) before reclassifications | (1) |  |  | (313) |  |  | — |  |  | (2) |  |  | (316) |  |  | 78 |  |  | (238) |
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net losses realized in net income | 13 |  |  | — |  |  | — |  |  | — |  |  | 13 |  |  | (4) |  |  | 9 |
Net yield adjustment from cash flow hedges currently in effect | — |  |  | 186 |  |  | — |  |  | — |  |  | 186 |  | (a) | (46) |  |  | 140 |
Amortization of prior service credit | — |  |  | — |  |  | (1) |  |  | — |  |  | (1) |  | (b) | — |  |  | (1) |
Amortization of actuarial gains | — |  |  | — |  |  | (2) |  |  | — |  |  | (2) |  | (b) | — |  |  | (2) |
Total other comprehensive income (loss) | 12 |  |  | (127) |  |  | (3) |  |  | (2) |  |  | (120) |  |  | 28 |  |  | (92) |
Balance — June 30, 2024 | $ | (239) |  |  | $ | (330) |  |  | $ | (158) |  |  | $ | (9) |  |  | $ | (736) |  |  | $ | 185 |  |  | $ | (551) |
__________________________________________________________________________________ (a)Included in Interest income in the Company's Consolidated Statement of Income. (b)Included in Other costs of operations in the Company's Consolidated Statement of Income.
Accumulated Other Comprehensive Income (Loss), Net | Accumulated other comprehensive income (loss), net consisted of the following:
(Dollars in millions) | Investment Securities |  | Cash Flow Hedges |  | Defined Benefit Plans |  | Other |  | Total
Balance — December 31, 2024 | $ | (153) |  |  | $ | (101) |  |  | $ | 98 |  |  | $ | (8) |  |  | $ | (164) |
Net gain (loss) during period | 214 |  |  | 164 |  |  | (3) |  |  | 4 |  |  | 379 |
Balance — June 30, 2025 | $ | 61 |  |  | $ | 63 |  |  | $ | 95 |  |  | $ | (4) |  |  | $ | 215 |

X
- Definition The tabular disclosure of components of other comprehensive income loss. + References No definition available. + Details
Name: | mtb_ComponentsOfOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | mtb_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration