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

12 Months Ended

Dec. 31, 2014

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, 2014
Tier 1 capital (minimum-$2.7 billion (Consolidated))	7,169			7,051
Total capital (minimum-$5.5 billion (Consolidated))	8,543			8,175
Risk-weighted assets	68,273			68,037
Average assets (fourth quarter)	69,284			69,092
Tier 1 capital to risk-weighted assets (minimum-4.0%)	10.50		%	10.36		%
Total capital to risk-weighted assets (minimum-8.0%)	12.51			12.02
Tier 1 capital to average assets (minimum-3.0%)	10.35			10.20
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

- 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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