XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Comprehensive income (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2024
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, 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) |
Balance — January 1, 2023 | $ | (444) |  |  | $ | (336) |  |  | $ | (273) |  |  | $ | (13) |  |  | $ | (1,066) |  |  | $ | 276 |  |  | $ | (790) |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains, net | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | (2) |  |  | 1 |
Unrealized losses on cash flow hedges | — |  |  | (208) |  |  | — |  |  | — |  |  | (208) |  |  | 51 |  |  | (157) |
Other | — |  |  | — |  |  | — |  |  | 4 |  |  | 4 |  |  | (1) |  |  | 3 |
Total other comprehensive income (loss) before reclassifications | 3 |  |  | (208) |  |  | — |  |  | 4 |  |  | (201) |  |  | 48 |  |  | (153) |
Amounts reclassified from accumulated other comprehensive income (loss) that (increase) decrease net income: |  |  |  |  |  |  |  |  |  |  |  |  |
Net yield adjustment from cash flow hedges currently in effect | — |  |  | 108 |  |  | — |  |  | — |  |  | 108 |  | (a) | (27) |  |  | 81 |
Amortization of prior service credit | — |  |  | — |  |  | (1) |  |  | — |  |  | (1) |  | (b) | — |  |  | (1) |
Amortization of actuarial gains | — |  |  | — |  |  | (2) |  |  | — |  |  | (2) |  | (b) | — |  |  | (2) |
Total other comprehensive income (loss) | 3 |  |  | (100) |  |  | (3) |  |  | 4 |  |  | (96) |  |  | 21 |  |  | (75) |
Balance — June 30, 2023 | $ | (441) |  |  | $ | (436) |  |  | $ | (276) |  |  | $ | (9) |  |  | $ | (1,162) |  |  | $ | 297 |  |  | $ | (865) |
_______________________________________________________________ (a)Included in "interest income" in the Consolidated Statement of Income. (b)Included in "other costs of operations" in the 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, 2023 | $ | (187) |  |  | $ | (151) |  |  | $ | (115) |  |  | $ | (6) |  |  | $ | (459) |
Net gain (loss) during period | 8 |  |  | (95) |  |  | (3) |  |  | (2) |  |  | (92) |
Balance — June 30, 2024 | $ | (179) |  |  | $ | (246) |  |  | $ | (118) |  |  | $ | (8) |  |  | $ | (551) |

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