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Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
CSC [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 17,264 $ 16,813
Actual Ratio 20.00% 17.60%
Minimum Capital Requirement Amount $ 3,877 $ 4,295
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 20,057 $ 19,606
Actual Ratio 23.30% 20.50%
Minimum Capital Requirement Amount $ 5,170 $ 5,726
Minimum Capital Requirement Ratio 6.00% 6.00%
Total Risk-Based Capital    
Actual Amount $ 20,075 $ 19,628
Actual Ratio 23.30% 20.60%
Minimum Capital Requirement Amount $ 6,893 $ 7,635
Minimum Capital Requirement Ratio 8.00% 8.00%
Tier 1 Leverage    
Actual Amount $ 20,057 $ 19,606
Actual Ratio 7.30% 7.10%
Minimum Capital Requirement Amount $ 10,945 $ 11,058
Minimum Capital Requirement Ratio 4.00% 4.00%
Supplemental Leverage Ratio    
Actual Amount $ 20,057  
Actual Ratio 7.10%  
Minimum Capital Requirement Amount $ 8,418  
Minimum Capital Requirement Ratio 3.00%  
CSB [Member]    
Common Equity Tier 1 Risk-Based Capital    
Actual Amount $ 15,577 $ 15,832
Actual Ratio 22.90% 19.70%
Minimum to be Well Capitalized Amount $ 4,430 $ 5,233
Minimum to be Well Capitalized Ratio 6.50% 6.50%
Minimum Capital Requirement Amount $ 3,067 $ 3,623
Minimum Capital Requirement Ratio 4.50% 4.50%
Tier 1 Risk-Based Capital    
Actual Amount $ 15,577 $ 15,832
Actual Ratio 22.90% 19.70%
Minimum to be Well Capitalized Amount $ 5,452 $ 6,441
Minimum to be Well Capitalized Ratio 8.00% 8.00%
Minimum Capital Requirement Amount $ 4,089 $ 4,831
Minimum Capital Requirement Ratio 6.00% 6.00%
Total Risk-Based Capital    
Actual Amount $ 15,594 $ 15,853
Actual Ratio 22.90% 19.70%
Minimum to be Well Capitalized Amount $ 6,815 $ 8,051
Minimum to be Well Capitalized Ratio 10.00% 10.00%
Minimum Capital Requirement Amount $ 5,452 $ 6,441
Minimum Capital Requirement Ratio 8.00% 8.00%
Tier 1 Leverage    
Actual Amount $ 15,577 $ 15,832
Actual Ratio 7.40% 7.20%
Minimum to be Well Capitalized Amount $ 10,537 $ 11,044
Minimum to be Well Capitalized Ratio 5.00% 5.00%
Minimum Capital Requirement Amount $ 8,429 $ 8,836
Minimum Capital Requirement Ratio 4.00% 4.00%
Supplemental Leverage Ratio    
Actual Amount $ 15,577  
Actual Ratio 7.20%  
Minimum Capital Requirement Amount $ 6,524  
Minimum Capital Requirement Ratio 3.00%