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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

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