v3.25.2
Document and Entity Information
Jun. 30, 2025
Document And Entity Information [Line Items]  
Entity Registrant Name CAPITAL ONE FINANCIAL CORP
Amendment Flag false
Entity Central Index Key 0000927628
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Jun. 30, 2025
Entity Incorporation State Country Code DE
Entity File Number 001-13300
Entity Tax Identification Number 54-1719854
Entity Address, Address Line One 1680 Capital One Drive
Entity Address, City or Town McLean
Entity Address, State or Province VA
Entity Address, Postal Zip Code 22102
City Area Code (703)
Local Phone Number 720-1000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock (par value $.01 per share)
Trading Symbol COF
Security Exchange Name NYSE
Series I Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series I
Trading Symbol COF PRI
Security Exchange Name NYSE
Series J Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series J
Trading Symbol COF PRJ
Security Exchange Name NYSE
Series K Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series K
Trading Symbol COF PRK
Security Exchange Name NYSE
Series L Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series L
Trading Symbol COF PRL
Security Exchange Name NYSE
Series N Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series N
Trading Symbol COF PRN
Security Exchange Name NYSE
Senior Notes [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.650% Senior Notes Due 2029
Trading Symbol COF29
Security Exchange Name NYSE