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Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Tables)
 12 Months Ended
Dec. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Summary of Capital Position
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, 2024
CET1 capital (minimum $3.3 billion (Consolidated))
$8,667$8,547
Tier 1 capital (minimum $4.4 billion (Consolidated))
9,0618,547
Total capital (minimum $5.8 billion (Consolidated))
10,3639,799
Risk-weighted assets72,90372,833
Average assets (fourth quarter)81,79781,643
CET1 capital to risk-weighted assets (minimum-4.5%)
11.89 %11.74 %
Tier 1 capital to risk-weighted assets (minimum-6.0%)
12.4311.74
Total capital to risk-weighted assets (minimum-8.0%)
14.2113.45
Tier 1 capital to average assets (minimum-4.0%)
11.0810.47
Capital conservation buffer (minimum-2.5%)
6.215.45
December 31, 2023
CET1 capital (minimum $3.4 billion (Consolidated))
$8,414 $8,007 
Tier 1 capital (minimum $4.6 billion (Consolidated))
8,808 8,007 
Total capital (minimum $6.1 billion (Consolidated))
10,263 9,362 
Risk-weighted assets75,901 75,783 
Average assets (fourth quarter)87,538 87,423 
CET1 capital to risk-weighted assets (minimum-4.5%)
11.09 %10.57 %
Tier 1 capital to risk-weighted assets (minimum-6.0%)
11.60 10.57 
Total capital to risk-weighted assets (minimum-8.0%)
13.52 12.35 
Tier 1 capital to average assets (minimum-4.0%)
10.06 9.16 
Capital conservation buffer (minimum-2.5%)
5.52 4.35