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Capital One Financial Corporation (Parent Company Only) - Statements of Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]      
Interest from temporary investments $ 28,513 $ 27,176 $ 25,222
Interest expense 5,173 4,301 2,762
Non-interest income 5,253 5,201 4,777
Non-interest expense 15,483 14,902 14,194
Income tax (benefit) 1,341 1,293 3,375
Net income 5,546 6,015 1,982
Comprehensive income 7,077 5,879 2,005
Parent Company      
Condensed Income Statements, Captions [Line Items]      
Interest from temporary investments 442 313 178
Interest expense 798 720 381
Dividends from subsidiaries 3,276 2,750 300
Non-interest income (21) 19 19
Non-interest expense 60 29 34
Income before income taxes and equity in undistributed earnings of subsidiaries 2,839 2,333 82
Income tax (benefit) (138) (128) (103)
Equity in undistributed earnings of subsidiaries 2,569 3,554 1,797
Net income 5,546 6,015 1,982
Other comprehensive income (loss), net of tax 1,531 (136) 23
Comprehensive income $ 7,077 $ 5,879 $ 2,005