Regulatory matters (Tables)

12 Months Ended

Dec. 31, 2023

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Summary of Required Minimum and Well Capitalized Capital Ratios

Pursuant to the rules in effect as of December 31, 2023, the required minimum and well capitalized capital ratios are as follows:

				Well
	Minimum			Capitalized
M&T (Consolidated)
CET1 to RWA		4.5	%
Tier 1 capital to RWA		6.0			6.0	%
Total capital to RWA		8.0			10.0
Leverage — Tier 1 capital to average total assets, as defined		4.0
				Well
	Minimum			Capitalized
Bank Subsidiaries
CET1 to RWA		4.5	%		6.5	%
Tier 1 capital to RWA		6.0			8.0
Total capital to RWA		8.0			10.0
Leverage — Tier 1 capital to average total assets, as defined		4.0			5.0

Capital Ratios and Amounts of Company and its Banking Subsidiaries

The capital ratios and amounts of the Company and its banking subsidiaries as of December 31, 2023 and 2022 are presented below:

(Dollars in millions)	M&T (Consolidated)			M&T Bank			Wilmington Trust, N.A.
December 31, 2023:
CET1 capital
Amount	$	16,908		$	17,667		$	583
Ratio(a)		10.98	%		11.53	%		263.48	%
Tier 1 capital
Amount	$	18,918		$	17,667		$	583
Ratio(a)		12.29	%		11.53	%		263.48	%
Total capital
Amount	$	21,533		$	19,884		$	584
Ratio(a)		13.99	%		12.97	%		263.85	%
Leverage
Amount	$	18,918		$	17,667		$	583
Ratio(b)		9.43	%		8.83	%		86.00	%
December 31, 2022:
CET1 capital
Amount	$	15,562		$	16,674		$	586
Ratio(a)		10.44	%		11.23	%		254.50	%
Tier 1 capital
Amount	$	17,573		$	16,674		$	586
Ratio(a)		11.79	%		11.23	%		254.50	%
Total capital
Amount	$	20,260		$	18,888		$	587
Ratio(a)		13.60	%		12.72	%		254.90	%
Leverage
Amount	$	17,573		$	16,674		$	586
Ratio(b)		9.23	%		8.77	%		85.73	%

(a)The ratio of capital to RWA, as defined by regulation.

(b)The ratio of capital to average assets, as defined by regulation.