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Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Tables)
 12 Months Ended
Dec. 31, 2023
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, 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 
December 31, 2022
CET1 capital (minimum $3.5 billion (Consolidated))
$7,884 $7,801 
Tier 1 capital (minimum $4.7 billion (Consolidated))
8,278 7,801 
Total capital (minimum $6.3 billion (Consolidated))
9,817 9,190 
Risk-weighted assets78,871 78,781 
Average assets (fourth quarter)86,726 86,608 
CET1 capital to risk-weighted assets (minimum-4.5%)
10.00 %9.90 %
Tier 1 capital to risk-weighted assets (minimum-6.0%)
10.50 9.90 
Total capital to risk-weighted assets (minimum-8.0%)
12.45 11.67 
Tier 1 capital to average assets (minimum-4.0%)
9.55 9.01 
Capital conservation buffer (minimum-2.5%)
4.45 3.67