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Regulatory and Capital Adequacy - Capital Ratios Under Basel III (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Common equity Tier 1 capital:    
Common equity Tier 1 capital $ 38,162 $ 33,071
Common equity Tier 1 capital, capital ratio 12.20% 11.20%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.50%
Tier 1 risk-based capital:    
Tier 1 capital $ 43,015 $ 37,431
Tier 1 capital, capital ratio 13.70% 12.70%
Tier 1 capital, minimum capital adequacy 6.00% 6.00%
Tier 1 capital, well-capitalized 6.00% 6.00%
Total risk-based capital:    
Total capital $ 50,348 $ 44,645
Total capital, capital ratio 16.10% 15.10%
Total capital, minimum capital adequacy 8.00% 8.00%
Total capital, well-capitalized 10.00% 10.00%
Tier 1 leverage capital:    
Tier 1 leverage capital $ 43,015 $ 37,431
Tier 1 leverage, capital ratio 11.70% 10.70%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Supplementary leverage:    
Tier one capital under BaselIII standardized approach $ 43,015 $ 37,431
Basel III Supplementary Leverage Ratio 9.90% 9.00%
Minimum Capital Adequacy for Supplementary Leverage Ratio 3.00% 3.00%
Capital One Bank (USA), N.A.    
Common equity Tier 1 capital:    
Common equity Tier 1 capital $ 17,883 $ 16,378
Common equity Tier 1 capital, capital ratio 16.10% 15.30%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.50%
Common equity Tie 1 capital, well capitalized 6.50% 6.50%
Tier 1 risk-based capital:    
Tier 1 capital $ 17,883 $ 16,378
Tier 1 capital, capital ratio 16.10% 15.30%
Tier 1 capital, minimum capital adequacy 6.00% 6.00%
Tier 1 capital, well-capitalized 8.00% 8.00%
Total risk-based capital:    
Total capital $ 20,109 $ 18,788
Total capital, capital ratio 18.10% 17.60%
Total capital, minimum capital adequacy 8.00% 8.00%
Total capital, well-capitalized 10.00% 10.00%
Tier 1 leverage capital:    
Tier 1 leverage capital $ 17,883 $ 16,378
Tier 1 leverage, capital ratio 14.80% 14.00%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Tier 1 leverage, well-capitalized 5.00% 5.00%
Supplementary leverage:    
Tier one capital under BaselIII standardized approach $ 17,883 $ 16,378
Basel III Supplementary Leverage Ratio 12.10% 11.50%
Minimum Capital Adequacy for Supplementary Leverage Ratio 3.00% 3.00%
Capital One, N.A.    
Common equity Tier 1 capital:    
Common equity Tier 1 capital $ 28,445 $ 25,637
Common equity Tier 1 capital, capital ratio 13.40% 13.00%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.50%
Common equity Tie 1 capital, well capitalized 6.50% 6.50%
Tier 1 risk-based capital:    
Tier 1 capital $ 28,445 $ 25,637
Tier 1 capital, capital ratio 13.40% 13.00%
Tier 1 capital, minimum capital adequacy 6.00% 6.00%
Tier 1 capital, well-capitalized 8.00% 8.00%
Total risk-based capital:    
Total capital $ 30,852 $ 27,912
Total capital, capital ratio 14.50% 14.20%
Total capital, minimum capital adequacy 8.00% 8.00%
Total capital, well-capitalized 10.00% 10.00%
Tier 1 leverage capital:    
Tier 1 leverage capital $ 28,445 $ 25,637
Tier 1 leverage, capital ratio 9.20% 9.10%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Tier 1 leverage, well-capitalized 5.00% 5.00%
Supplementary leverage:    
Tier one capital under BaselIII standardized approach $ 28,445 $ 25,637
Basel III Supplementary Leverage Ratio 8.20% 8.00%
Minimum Capital Adequacy for Supplementary Leverage Ratio 3.00% 3.00%