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Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021
CET1 capital (minimum $3.1 billion (Consolidated))
$7,064 $7,634 
Tier 1 capital (minimum $4.2 billion (Consolidated))
7,458 7,634 
Total capital (minimum $5.6 billion (Consolidated))
8,608 8,584 
Risk-weighted assets69,708 69,542 
Average assets (fourth quarter)96,417 96,216 
CET1 capital to risk-weighted assets (minimum-4.5%)
10.13 %10.98 %
Tier 1 capital to risk-weighted assets (minimum-6.0%)
10.70 10.98 
Total capital to risk-weighted assets (minimum-8.0%)
12.35 12.34 
Tier 1 capital to average assets (minimum-4.0%)
7.74 7.93 
Capital conservation buffer (minimum-2.5%)
4.35 4.34 
December 31, 2020
CET1 capital (minimum $3.0 billion (Consolidated))
$6,919 $7,278 
Tier 1 capital (minimum $4.0 billion (Consolidated))
7,313 7,278 
Total capital (minimum $5.4 billion (Consolidated))
8,833 8,547 
Risk-weighted assets66,931 66,759 
Average assets (fourth quarter)84,705 84,536 
CET1 capital to risk-weighted assets (minimum-4.5%)
10.34 %10.90 %
Tier 1 capital to risk-weighted assets (minimum-6.0%)
10.93 10.90 
Total capital to risk-weighted assets (minimum-8.0%)
13.20 12.80 
Tier 1 capital to average assets (minimum-4.0%)
8.63 8.61 
Capital conservation buffer (minimum-2.5%)
4.93 4.80