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Regulatory and Capital Adequacy - Schedule of Comparison of Capital Ratios (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Common equity Tier 1 capital:    
Common equity Tier 1 Capital $ 29,544 $ 29,534
Common equity Tier 1 capital, capital ratio 11.10% 12.50%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.00%
Tier 1 risk-based capital:    
Tier 1 capital $ 32,838 $ 31,355
Tier 1 capital, capital ratio 12.40% 13.20%
Tier 1 capital, minimum capital adequacy 6.00% 5.50%
Tier 1 capital, well-capitalized 6.00% 6.00%
Total risk-based capital:    
Total capital $ 38,838 $ 35,879
Total capital, capital ratio 14.60% 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 $ 32,838 $ 31,355
Tier 1 leverage, capital ratio 10.60% 10.77%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Tier one capital under BaselIII standardized approach $ 357,794  
Basel III supplementary leverage ratio 9.20%  
Supplementary Leverage Ratio Minimum Requirement for Capital Adequacy 3.00%  
Capital One Bank (USA), N.A.    
Common equity Tier 1 capital:    
Common equity Tier 1 Capital $ 10,644 $ 8,503
Common equity Tier 1 capital, capital ratio 12.20% 11.30%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.00%
TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.50%  
Tier 1 risk-based capital:    
Tier 1 capital $ 10,644 $ 8,503
Tier 1 capital, capital ratio 12.20% 11.30%
Tier 1 capital, minimum capital adequacy 6.00% 5.50%
Tier 1 capital, well-capitalized 8.00% 6.00%
Total risk-based capital:    
Total capital $ 13,192 $ 10,938
Total capital, capital ratio 15.20% 14.60%
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 $ 10,644 $ 8,503
Tier 1 leverage, capital ratio 10.80% 9.60%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Tier 1 leverage, well-capitalized 5.00% 5.00%
Tier one capital under BaselIII standardized approach $ 118,859  
Basel III supplementary leverage ratio 9.00%  
Capital One, N.A.    
Common equity Tier 1 capital:    
Common equity Tier 1 Capital $ 21,765 $ 21,136
Common equity Tier 1 capital, capital ratio 11.80% 12.50%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.00%
TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.50%  
Tier 1 risk-based capital:    
Tier 1 capital $ 21,765 $ 21,136
Tier 1 capital, capital ratio 11.80% 12.50%
Tier 1 capital, minimum capital adequacy 6.00% 5.50%
Tier 1 capital, well-capitalized 8.00% 6.00%
Total risk-based capital:    
Total capital $ 23,832 $ 22,881
Total capital, capital ratio 12.90% 13.60%
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 $ 21,765 $ 21,136
Tier 1 leverage, capital ratio 8.80% 8.90%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Tier 1 leverage, well-capitalized 5.00% 5.00%
Tier one capital under BaselIII standardized approach $ 276,132  
Basel III supplementary leverage ratio 7.90%