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Regulatory Requirements (Regulatory Capital and Ratios) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
CSC [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 27,967 $ 22,916
Actual Ratio 0.197 0.185
Minimum Capital Requirement Amount $ 6,389 $ 5,575
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 37,921 $ 30,649
Actual Ratio 0.267 0.247
Minimum Capital Requirement Amount $ 8,518 $ 7,433
Minimum Capital Requirement Ratio 0.060 0.060
Total Risk-Based Capital    
Actual Amount $ 37,950 $ 30,688
Actual Ratio 0.267 0.248
Minimum Capital Requirement Amount $ 11,358 $ 9,910
Minimum Capital Requirement Ratio 0.080 0.080
Tier 1 Leverage    
Actual Amount $ 37,921 $ 30,649
Actual Ratio 0.062 0.063
Minimum Capital Requirement Amount $ 24,346 $ 19,396
Minimum Capital Requirement Ratio 0.040 0.040
Supplemental Leverage Ratio    
Actual Amount $ 37,921 $ 30,649
Actual Ratio 0.062 0.062
Minimum Capital Requirement Amount $ 18,434 $ 14,744
Minimum Capital Requirement Ratio 3.00% 3.00%
CSB [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 28,014 $ 17,526
Actual Ratio 0.268 0.192
Minimum to be Well Capitalized Amount $ 6,787 $ 5,919
Minimum to be Well Capitalized Ratio 6.50% 6.50%
Minimum Capital Requirement Amount $ 4,698 $ 4,098
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 28,014 $ 17,526
Actual Ratio 0.268 0.192
Minimum to be Well Capitalized Amount $ 8,353 $ 7,285
Minimum to be Well Capitalized Ratio 0.080 0.080
Minimum Capital Requirement Amount $ 6,265 $ 5,464
Minimum Capital Requirement Ratio 0.060 0.060
Total Risk-Based Capital    
Actual Amount $ 28,033 $ 17,558
Actual Ratio 0.268 0.193
Minimum to be Well Capitalized Amount $ 10,441 $ 9,106
Minimum to be Well Capitalized Ratio 0.100 0.100
Minimum Capital Requirement Amount $ 8,353 $ 7,285
Minimum Capital Requirement Ratio 0.080 0.080
Tier 1 Leverage    
Actual Amount $ 28,014 $ 17,526
Actual Ratio 0.071 0.055
Minimum to be Well Capitalized Amount $ 19,790 $ 15,979
Minimum to be Well Capitalized Ratio 0.050 0.050
Minimum Capital Requirement Amount $ 15,832 $ 12,783
Minimum Capital Requirement Ratio 0.040 0.040
Supplemental Leverage Ratio    
Actual Amount $ 28,014 $ 17,526
Actual Ratio 0.070 0.054
Minimum Capital Requirement Amount $ 12,016 $ 9,763
Minimum Capital Requirement Ratio 3.00% 3.00%