Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Tables)

12 Months Ended

Dec. 31, 2013

Regulatory Capital Requirements [Abstract]

The following is a summary of the capital position of the Corporation and Comerica Bank, its principal banking subsidiary.



(dollar amounts in millions)	Comerica Incorporated (Consolidated)			Comerica Bank
December 31, 2013
Tier 1 capital (minimum-$2.6 billion (Consolidated))	$	6,895		$	6,803
Total capital (minimum-$5.2 billion (Consolidated))	8,491			8,340
Risk-weighted assets	64,825			64,629
Average assets (fourth quarter)	64,017			63,836
Tier 1 capital to risk-weighted assets (minimum-4.0%)	10.64		%	10.53		%
Total capital to risk-weighted assets (minimum-8.0%)	13.10			12.90
Tier 1 capital to average assets (minimum-3.0%)	10.77			10.66
December 31, 2012
Tier 1 capital (minimum-$2.6 billion (Consolidated))	$	6,705		$	6,700
Total capital (minimum-$5.3 billion (Consolidated))	8,695			8,570
Risk-weighted assets	66,115			65,922
Average assets (fourth quarter)	63,418			63,223
Tier 1 capital to risk-weighted assets (minimum-4.0%)	10.14		%	10.16		%
Total capital to risk-weighted assets (minimum-8.0%)	13.15			13.00
Tier 1 capital to average assets (minimum-3.0%)	10.57			10.60

- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

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