v3.25.4
Regulatory Requirements - Regulatory Capital and Ratios (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
CSC    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 36,081 $ 35,995
Actual Ratio 0.304 0.317
Minimum Capital Requirement Amount $ 5,345 $ 5,114
Minimum Capital Requirement Ratio 0.045 0.045
Tier 1 Risk-Based Capital    
Actual Amount $ 42,844 $ 45,186
Actual Ratio 0.361 0.398
Minimum Capital Requirement Amount $ 7,127 $ 6,819
Minimum Capital Requirement Ratio 0.060 0.060
Total Risk-Based Capital    
Actual Amount $ 42,894 $ 45,218
Actual Ratio 0.361 0.398
Minimum Capital Requirement Amount $ 9,503 $ 9,092
Minimum Capital Requirement Ratio 0.080 0.080
Tier 1 Leverage    
Actual Amount $ 42,844 $ 45,186
Actual Ratio 0.093 0.099
Minimum Capital Requirement Amount $ 18,499 $ 18,325
Minimum Capital Requirement Ratio 0.040 0.040
Supplemental Leverage Ratio    
Actual Amount $ 42,844 $ 45,186
Actual Ratio 0.092 0.098
Minimum Capital Requirement Amount $ 13,974 $ 13,836
Minimum Capital Requirement Ratio 0.030 0.030
CSB    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 28,126 $ 32,584
Actual Ratio 0.359 0.417
Minimum to be Well Capitalized Amount $ 5,088 $ 5,079
Minimum to be Well Capitalized Ratio 0.065 0.065
Minimum Capital Requirement Amount $ 3,523 $ 3,516
Minimum Capital Requirement Ratio 0.045 0.045
Tier 1 Risk-Based Capital    
Actual Amount $ 28,126 $ 32,584
Actual Ratio 0.359 0.417
Minimum to be Well Capitalized Amount $ 6,262 $ 6,251
Minimum to be Well Capitalized Ratio 0.080 0.080
Minimum Capital Requirement Amount $ 4,697 $ 4,688
Minimum Capital Requirement Ratio 0.060 0.060
Total Risk-Based Capital    
Actual Amount $ 28,163 $ 32,606
Actual Ratio 0.360 0.417
Minimum to be Well Capitalized Amount $ 7,828 $ 7,813
Minimum to be Well Capitalized Ratio 0.100 0.100
Minimum Capital Requirement Amount $ 6,262 $ 6,251
Minimum Capital Requirement Ratio 0.080 0.080
Tier 1 Leverage    
Actual Amount $ 28,126 $ 32,584
Actual Ratio 0.111 0.116
Minimum to be Well Capitalized Amount $ 12,641 $ 14,035
Minimum to be Well Capitalized Ratio 0.050 0.050
Minimum Capital Requirement Amount $ 10,113 $ 11,228
Minimum Capital Requirement Ratio 0.040 0.040
Supplemental Leverage Ratio    
Actual Amount $ 28,126 $ 32,584
Actual Ratio 0.110 0.115
Minimum Capital Requirement Amount $ 7,649 $ 8,479
Minimum Capital Requirement Ratio 0.030 0.030