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Regulatory and Capital Adequacy - Schedule of Comparison of Capital Ratios (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Common equity Tier 1 capital:    
Common equity Tier 1 Capital $ 28,803 $ 29,544
Common equity Tier 1 capital, capital ratio 10.10% 11.10%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.50%
Tier 1 risk-based capital:    
Tier 1 capital $ 33,162 $ 32,838
Tier 1 capital, capital ratio 11.60% 12.40%
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 $ 40,817 $ 38,838
Total capital, capital ratio 14.30% 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 $ 33,162 $ 32,838
Tier 1 leverage, capital ratio 9.90% 10.60%
Tier 1 leverage, minimum capital adequacy 4.00% 4.00%
Tier one capital under BaselIII standardized approach $ 33,162 $ 32,838
Basel III supplementary leverage ratio 8.60% 9.20%
Capital One Bank (USA), N.A.    
Common equity Tier 1 capital:    
Common equity Tier 1 Capital $ 11,568 $ 10,644
Common equity Tier 1 capital, capital ratio 12.00% 12.20%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.50%
TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.50% 6.50%
Tier 1 risk-based capital:    
Tier 1 capital $ 11,568 $ 10,644
Tier 1 capital, capital ratio 12.00% 12.20%
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 $ 14,230 $ 13,192
Total capital, capital ratio 14.80% 15.20%
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 $ 11,568 $ 10,644
Tier 1 leverage, capital ratio 10.80% 10.80%
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 $ 11,568 $ 10,644
Basel III supplementary leverage ratio 8.90% 9.00%
Capital One, N.A.    
Common equity Tier 1 capital:    
Common equity Tier 1 Capital $ 20,670 $ 21,765
Common equity Tier 1 capital, capital ratio 10.60% 11.80%
Common equity Tier 1 capital, minimum capital adequacy 4.50% 4.50%
TierOneCommonCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.50% 6.50%
Tier 1 risk-based capital:    
Tier 1 capital $ 20,670 $ 21,765
Tier 1 capital, capital ratio 10.60% 11.80%
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 $ 23,117 $ 23,832
Total capital, capital ratio 11.80% 12.90%
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 $ 20,670 $ 21,765
Tier 1 leverage, capital ratio 7.70% 8.80%
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 $ 20,670 $ 21,765
Basel III supplementary leverage ratio 6.90% 7.90%