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REGULATORY CAPITAL (Tables)
12 Months Ended
Dec. 31, 2020
Regulatory Capital [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 millions of dollars, except ratiosStated
minimum
CitigroupCitibank
Well-
capitalized
minimum
December 31, 2020December 31, 2019Well-
capitalized
minimum
December 31, 2020December 31, 2019
Common Equity Tier 1 Capital  $147,274 $137,798  $142,884 $130,720 
Tier 1 Capital  167,053 155,805  144,992 132,847 
Total Capital (Tier 1 Capital + Tier 2 Capital)—Standardized Approach
204,849 193,711 169,235 157,253 
Total Capital (Tier 1 Capital + Tier 2 Capital)—Advanced Approaches
195,959 181,337 161,294 145,918 
Total risk-weighted assets—Standardized Approach1,221,576 1,168,848 1,030,081 1,022,607 
Total risk-weighted assets—Advanced Approaches1,255,284 1,142,804 1,012,129 938,735 
Quarterly adjusted average total assets(1)
 2,265,615 1,957,039 1,680,056 1,459,780 
Total Leverage Exposure(2)
2,386,881 2,513,702 2,167,969 1,958,173 
Common Equity Tier 1 Capital ratio(3)
4.5 %    N/A11.73 %11.79 %6.5 %13.87 %12.78 %
Tier 1 Capital ratio(3)
6.0 6.0 %13.31 13.33 8.0 14.08 12.99 
Total Capital ratio(3)
8.0 10.0 15.61 15.87 10.0 15.94 15.38 
Tier 1 Leverage ratio4.0 N/A7.37 7.96 5.0 8.63 9.10 
Supplementary Leverage ratio3.0 N/A7.00 6.20 6.0 6.69 6.78 

(1)Tier 1 Leverage ratio denominator.
(2)Supplementary Leverage ratio denominator.
(3)Citigroup’s reportable Common Equity Tier 1 Capital, Tier 1 Capital and Total Capital ratios as of December 31, 2020 were the lower derived under the Basel III Advanced Approaches frameworks, whereas Citigroup’s reportable Common Equity Tier 1 Capital and Tier 1 Capital ratios were the lower derived under the Basel III Standardized Approach and the reportable Total Capital ratio was the lower derived under the Basel III Advanced Approaches framework as of December 31, 2019. As of December 31, 2020 and 2019, 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 Total Capital ratios were the lower derived under the Basel III Advanced Approaches frameworks as of December 31, 2020 and the lower derived under the Standardized Approach as of December 31, 2019.
N/A Not applicable