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REGULATORY CAPITAL (Tables)
12 Months Ended
Dec. 31, 2017
Banking and Thrift [Abstract]  
Schedule of compliance with regulatory capital requirements under banking regulations
 The following table sets forth for Citigroup and Citibank the regulatory capital tiers, total risk-weighted assets, quarterly adjusted average total assets, Total Leverage Exposure, risk-based capital ratios and leverage ratios in accordance with current regulatory standards (reflecting Basel III Transition Arrangements):
 
In millions of dollars, except ratios
Stated
minimum
Citigroup
Citibank
Well-
capitalized
minimum
December 31, 2017
Well-
capitalized
minimum
December 31, 2017
Common Equity Tier 1 Capital
 

 

$
147,891

 

$
124,733

Tier 1 Capital
 

 

164,841

 

126,303

Total Capital (Tier 1 Capital + Tier 2 Capital)(1)
 

 

190,331

 

139,351

Total risk-weighted assets(2)
 
 
1,138,167

 
1,014,242

Quarterly adjusted average total assets(3)
 
 
1,869,206

 
1,401,615

Total Leverage Exposure(4)
 
 
2,433,371

 
1,901,069

Common Equity Tier 1 Capital ratio(5)
4.5
%
    N/A

12.99
%
6.5
%
12.30
%
Tier 1 Capital ratio(5)
6.0

6.0
%
14.48

8.0

12.45

Total Capital ratio(5)
8.0

10.0

16.77

10.0

14.60

Tier 1 Leverage ratio
4.0

N/A

8.82

5.0

9.01

Supplementary Leverage ratio(6)
N/A

N/A

6.77

N/A

6.64


(1)
Reflected in the table above is Citigroup’s and Citibank’s Total Capital as derived under the Basel III Advanced Approaches framework. At December 31, 2017, Citigroup’s and Citibank’s Total Capital as derived under the Basel III Standardized Approach was $202 billion and $150 billion, respectively.
(2)
Reflected in the table above are Citigroup’s and Citibank’s total risk-weighted assets as derived under the Basel III Standardized Approach. At December 31, 2017, Citigroup’s and Citibank’s total risk-weighted assets as derived under the Basel III Advanced Approaches were $1,135 billion and $955 billion, respectively.
(3)
Tier 1 Leverage ratio denominator.
(4)
Supplementary Leverage ratio denominator.
(5)
As of December 31, 2017, Citigroup’s and Citibank’s reportable Common Equity Tier 1 Capital and Tier 1 Capital ratios were the lower derived under the Basel III Standardized Approach, whereas the reportable Total Capital ratios were the lower derived under the Basel III Advanced Approaches framework.
(6)
Commencing on January 1, 2018, Citigroup and Citibank will be required to maintain a stated minimum Supplementary Leverage ratio of 3%, and Citibank will be required to maintain a Supplementary Leverage ratio of 6% to be considered “well capitalized.”
N/A  Not applicable