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Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
CSC [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 18,197 $ 17,660
Actual Ratio 18.40% 19.50%
Minimum Capital Requirement Amount $ 4,457 $ 4,073
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 20,990 $ 20,453
Actual Ratio 21.20% 22.60%
Minimum Capital Requirement Amount $ 5,942 $ 5,431
Minimum Capital Requirement Ratio 6.00% 6.00%
Total Risk-Based Capital    
Actual Amount $ 21,023 $ 20,472
Actual Ratio 21.20% 22.60%
Minimum Capital Requirement Amount $ 7,923 $ 7,241
Minimum Capital Requirement Ratio 8.00% 8.00%
Tier 1 Leverage    
Actual Amount $ 20,990 $ 20,453
Actual Ratio 6.90% 7.30%
Minimum Capital Requirement Amount $ 12,137 $ 11,189
Minimum Capital Requirement Ratio 4.00% 4.00%
Supplemental Leverage Ratio    
Actual Amount $ 20,990 $ 20,453
Actual Ratio 6.80% 7.10%
Minimum Capital Requirement Amount $ 9,309 $ 8,604
Minimum Capital Requirement Ratio 3.00% 3.00%
CSB [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 15,413 $ 14,819
Actual Ratio 19.70% 20.70%
Minimum to be Well Capitalized Amount $ 5,075 $ 4,649
Minimum to be Well Capitalized Ratio 6.50% 6.50%
Minimum Capital Requirement Amount $ 3,514 $ 3,218
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 15,413 $ 14,819
Actual Ratio 19.70% 20.70%
Minimum to be Well Capitalized Amount $ 6,247 $ 5,722
Minimum to be Well Capitalized Ratio 8.00% 8.00%
Minimum Capital Requirement Amount $ 4,685 $ 4,291
Minimum Capital Requirement Ratio 6.00% 6.00%
Total Risk-Based Capital    
Actual Amount $ 15,445 $ 14,837
Actual Ratio 19.80% 20.70%
Minimum to be Well Capitalized Amount $ 7,808 $ 7,152
Minimum to be Well Capitalized Ratio 10.00% 10.00%
Minimum Capital Requirement Amount $ 6,247 $ 5,722
Minimum Capital Requirement Ratio 8.00% 8.00%
Tier 1 Leverage    
Actual Amount $ 15,413 $ 14,819
Actual Ratio 6.90% 7.10%
Minimum to be Well Capitalized Amount $ 11,114 $ 10,486
Minimum to be Well Capitalized Ratio 5.00% 5.00%
Minimum Capital Requirement Amount $ 8,891 $ 8,389
Minimum Capital Requirement Ratio 4.00% 4.00%
Supplemental Leverage Ratio    
Actual Amount $ 15,413 $ 14,819
Actual Ratio 6.70% 6.80%
Minimum Capital Requirement Amount $ 6,867 $ 6,497
Minimum Capital Requirement Ratio 3.00% 3.00%