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v3.25.3

Regulatory Requirements - Regulatory Capital and Ratios (Details) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
CSC |  |
Common Equity Tier 1 Risk-Based Capital |  |
Actual Amount | $ 36,728 | $ 35,995
Actual Ratio | 0.328 | 0.317
Minimum Capital Requirement Amount | $ 5,035 | $ 5,114
Minimum Capital Requirement Ratio | 0.045 | 0.045
Tier 1 Risk-Based Capital |  |
Actual Amount | $ 43,491 | $ 45,186
Actual Ratio | 0.389 | 0.398
Minimum Capital Requirement Amount | $ 6,714 | $ 6,819
Minimum Capital Requirement Ratio | 0.060 | 0.060
Total Risk-Based Capital |  |
Actual Amount | $ 43,552 | $ 45,218
Actual Ratio | 0.389 | 0.398
Minimum Capital Requirement Amount | $ 8,952 | $ 9,092
Minimum Capital Requirement Ratio | 0.080 | 0.080
Tier 1 Leverage |  |
Actual Amount | $ 43,491 | $ 45,186
Actual Ratio | 0.097 | 0.099
Minimum Capital Requirement Amount | $ 17,884 | $ 18,325
Minimum Capital Requirement Ratio | 0.040 | 0.040
Supplementary Leverage Ratio |  |
Actual Amount | $ 43,491 | $ 45,186
Actual Ratio | 0.097 | 0.098
Minimum Capital Requirement Amount | $ 13,513 | $ 13,836
Minimum Capital Requirement Ratio | 0.030 | 0.030
CSB |  |
Common Equity Tier 1 Risk-Based Capital |  |
Actual Amount | $ 31,514 | $ 32,584
Actual Ratio | 0.408 | 0.417
Minimum to be Well Capitalized Amount | $ 5,019 | $ 5,079
Minimum to be Well Capitalized Ratio | 0.065 | 0.065
Minimum Capital Requirement Amount | $ 3,475 | $ 3,516
Minimum Capital Requirement Ratio | 0.045 | 0.045
Tier 1 Risk-Based Capital |  |
Actual Amount | $ 31,514 | $ 32,584
Actual Ratio | 0.408 | 0.417
Minimum to be Well Capitalized Amount | $ 6,177 | $ 6,251
Minimum to be Well Capitalized Ratio | 0.080 | 0.080
Minimum Capital Requirement Amount | $ 4,633 | $ 4,688
Minimum Capital Requirement Ratio | 0.060 | 0.060
Total Risk-Based Capital |  |
Actual Amount | $ 31,537 | $ 32,606
Actual Ratio | 0.408 | 0.417
Minimum to be Well Capitalized Amount | $ 7,722 | $ 7,813
Minimum to be Well Capitalized Ratio | 0.100 | 0.100
Minimum Capital Requirement Amount | $ 6,177 | $ 6,251
Minimum Capital Requirement Ratio | 0.080 | 0.080
Tier 1 Leverage |  |
Actual Amount | $ 31,514 | $ 32,584
Actual Ratio | 0.124 | 0.116
Minimum to be Well Capitalized Amount | $ 12,694 | $ 14,035
Minimum to be Well Capitalized Ratio | 0.050 | 0.050
Minimum Capital Requirement Amount | $ 10,155 | $ 11,228
Minimum Capital Requirement Ratio | 0.040 | 0.040
Supplementary Leverage Ratio |  |
Actual Amount | $ 31,514 | $ 32,584
Actual Ratio | 0.123 | 0.115
Minimum Capital Requirement Amount | $ 7,684 | $ 8,479
Minimum Capital Requirement Ratio | 0.030 | 0.030

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- Definition The Common Equity Tier 1 capital ratio (Common equity tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Amount of total capital as defined by regulatory framework. + 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/1943274/2147477270/942-505-50-1 + Details
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