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Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
CSC [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 17,438 $ 17,660
Actual Ratio 15.90% 19.50%
Minimum Capital Requirement Amount $ 4,921 $ 4,073
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 22,701 $ 20,453
Actual Ratio 20.80% 22.60%
Minimum Capital Requirement Amount $ 6,562 $ 5,431
Minimum Capital Requirement Ratio 6.00% 6.00%
Total Risk-Based Capital    
Actual Amount $ 22,735 $ 20,472
Actual Ratio 20.80% 22.60%
Minimum Capital Requirement Amount $ 8,749 $ 7,241
Minimum Capital Requirement Ratio 8.00% 8.00%
Tier 1 Leverage    
Actual Amount $ 22,701 $ 20,453
Actual Ratio 5.70% 7.30%
Minimum Capital Requirement Amount $ 16,071 $ 11,189
Minimum Capital Requirement Ratio 4.00% 4.00%
Supplemental Leverage Ratio    
Actual Amount $ 22,701 $ 20,453
Actual Ratio 5.60% 7.10%
Minimum Capital Requirement Amount $ 12,249 $ 8,604
Minimum Capital Requirement Ratio 3.00% 3.00%
CSB [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 16,648 $ 14,819
Actual Ratio 19.10% 20.70%
Minimum to be Well Capitalized Amount $ 5,656 $ 4,649
Minimum to be Well Capitalized Ratio 6.50% 6.50%
Minimum Capital Requirement Amount $ 3,916 $ 3,218
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 16,648 $ 14,819
Actual Ratio 19.10% 20.70%
Minimum to be Well Capitalized Amount $ 6,962 $ 5,722
Minimum to be Well Capitalized Ratio 8.00% 8.00%
Minimum Capital Requirement Amount $ 5,221 $ 4,291
Minimum Capital Requirement Ratio 6.00% 6.00%
Total Risk-Based Capital    
Actual Amount $ 16,680 $ 14,837
Actual Ratio 19.20% 20.70%
Minimum to be Well Capitalized Amount $ 8,702 $ 7,152
Minimum to be Well Capitalized Ratio 10.00% 10.00%
Minimum Capital Requirement Amount $ 6,962 $ 5,722
Minimum Capital Requirement Ratio 8.00% 8.00%
Tier 1 Leverage    
Actual Amount $ 16,648 $ 14,819
Actual Ratio 5.60% 7.10%
Minimum to be Well Capitalized Amount $ 14,813 $ 10,486
Minimum to be Well Capitalized Ratio 5.00% 5.00%
Minimum Capital Requirement Amount $ 11,850 $ 8,389
Minimum Capital Requirement Ratio 4.00% 4.00%
Supplemental Leverage Ratio    
Actual Amount $ 16,648 $ 14,819
Actual Ratio 5.50% 6.80%
Minimum Capital Requirement Amount $ 9,076 $ 6,497
Minimum Capital Requirement Ratio 3.00% 3.00%