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Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Tables) | 12 Months Ended
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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 assets | 75,901 |  |  | 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 assets | 78,871 |  |  | 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 |

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B + Details
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