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Regulatory Requirements (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 28, 2018
Dec. 31, 2017
Dec. 31, 2016
Broker Dealer Subsidiaries Net Capital [Line Items]      
Required Net Capital   $ 215,000,000 $ 159,000,000
Net Capital   1,251,000,000 1,012,000,000
Excess Net Capital   1,036,000,000 853,000,000
E TRADE Securities [Member]      
Broker Dealer Subsidiaries Net Capital [Line Items]      
Dividends from subsidiaries paid to parent company   345,000,000  
Net capital requirement under alternative method   $ 250,000  
Minimum percentage of aggregate debit balances to calculate net capital   2.00%  
Required Net Capital   $ 211,000,000 158,000,000
Net Capital   1,213,000,000 969,000,000
Excess Net Capital   1,002,000,000 811,000,000
E TRADE Futures [Member]      
Broker Dealer Subsidiaries Net Capital [Line Items]      
Net capital requirement under CFTC regulations   $ 1,000,000  
Minimum percentage of total risk margin requirements to calculate net capital   8.00%  
Required Net Capital   $ 4,000,000  
Net Capital   19,000,000  
Excess Net Capital   15,000,000  
OptionsHouse [Member]      
Broker Dealer Subsidiaries Net Capital [Line Items]      
Required Net Capital     1,000,000
Net Capital     22,000,000
Excess Net Capital     21,000,000
International broker-dealer [Member]      
Broker Dealer Subsidiaries Net Capital [Line Items]      
Required Net Capital   0 0
Net Capital   19,000,000 21,000,000
Excess Net Capital   $ 19,000,000 $ 21,000,000
Subsequent Event [Member] | E TRADE Securities [Member]      
Broker Dealer Subsidiaries Net Capital [Line Items]      
Dividends from subsidiaries paid to parent company $ 125,000,000