| Document and Entity Information | Oct. 16, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 16, 2019 |
| Entity Registrant Name | E*TRADE Financial Corporation |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-11921 |
| Entity Tax Identification Number | 94-2844166 |
| Entity Address, Address Line One | 11 Times Square |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10036 |
| City Area Code | 646 |
| Local Phone Number | 521-4300 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001015780 |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | ETFC |
| Security Exchange Name | NASDAQ |
