Regulatory Requirements (Details) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Minimum Net Capital Required [Abstract]
Minimum percentage of net capital required for broker dealer subsidiary aggregate indebtedness		6.67%
Alternative net capital requirement		$ 250,000
Minimum percentage of aggregate debit balances		2.00%
Broker Dealer Subsidiaries Net Capital [Line Items]
Required Net Capital		$ 139,000,000	$ 162,000,000
Net Capital		981,000,000	1,071,000,000
Excess Net Capital		842,000,000	909,000,000
E TRADE Financial [Member]
Tier I leverage [Abstract]
Tier 1 leverage capital		$ 3,410,000,000	$ 3,747,000,000
Tier 1 leverage capital to adjusted assets (percent)		7.80%	9.00%
Tier 1 leverage capital required to be well capitalized		$ 2,177,000,000	$ 2,093,000,000
Tier 1 leverage capital required to be well capitalized to adjusted assets (percent)		5.00%	5.00%
Excess Tier 1 leverage capital to well capitalized		$ 1,233,000,000	$ 1,654,000,000
Common equity Tier I capital [Abstract]
Common equity Tier 1 capital		$ 3,410,000,000	$ 3,747,000,000
Common equity Tier 1 to risk weighted assets (percent)		34.50%	39.30%
Common equity Tier 1 capital required to be well capitalized		$ 642,000,000	$ 620,000,000
Common equity Tier 1 capital required to be well capitalized to risk weighted assets (percent)		6.50%	6.50%
Excess Common equity Tier 1 capital to be well capitalized		$ 2,768,000,000	$ 3,127,000,000
Tier I risk based capital [Abstract]
Tier 1 risk based capital		$ 3,410,000,000	$ 3,747,000,000
Tier 1 risk based capital to risk weighted assets (percent)		34.50%	39.30%
Tier 1 risk based capital required to be well capitalized		$ 791,000,000	$ 763,000,000
Tier 1 risk based capital required to be well capitalized to risk weighted assets (percent)		8.00%	8.00%
Excess Tier 1 risk based capital to well capitalized		$ 2,619,000,000	$ 2,984,000,000
Total risk-based capital [Abstract]
Total capital		$ 3,956,000,000	$ 4,186,000,000
Total capital to risk weighted assets (percent)		40.00%	43.90%
Capital required to be well capitalized		$ 988,000,000	$ 954,000,000
Total capital required to be well capitalized to risk weighted assets (percent)		10.00%	10.00%
Excess capital to be well capitalized		$ 2,968,000,000	$ 3,232,000,000
E TRADE Bank [Member]
Tier I leverage [Abstract]
Tier 1 leverage capital		$ 2,895,000,000	$ 3,075,000,000
Tier 1 leverage capital to adjusted assets (percent)		8.60%	9.70%
Tier 1 leverage capital required to be well capitalized		$ 1,691,000,000	$ 1,579,000,000
Tier 1 leverage capital required to be well capitalized to adjusted assets (percent)		5.00%	5.00%
Excess Tier 1 leverage capital to well capitalized		$ 1,204,000,000	$ 1,496,000,000
Common equity Tier I capital [Abstract]
Common equity Tier 1 capital		$ 2,895,000,000	$ 3,075,000,000
Common equity Tier 1 to risk weighted assets (percent)		33.30%	36.50%
Common equity Tier 1 capital required to be well capitalized		$ 565,000,000	$ 548,000,000
Common equity Tier 1 capital required to be well capitalized to risk weighted assets (percent)		6.50%	6.50%
Excess Common equity Tier 1 capital to be well capitalized		$ 2,330,000,000	$ 2,527,000,000
Tier I risk based capital [Abstract]
Tier 1 risk based capital		$ 2,895,000,000	$ 3,075,000,000
Tier 1 risk based capital to risk weighted assets (percent)		33.30%	36.50%
Tier 1 risk based capital required to be well capitalized		$ 696,000,000	$ 674,000,000
Tier 1 risk based capital required to be well capitalized to risk weighted assets (percent)		8.00%	8.00%
Excess Tier 1 risk based capital to well capitalized		$ 2,199,000,000	$ 2,401,000,000
Total risk-based capital [Abstract]
Total capital		$ 3,009,000,000	$ 3,185,000,000
Total capital to risk weighted assets (percent)		34.60%	37.80%
Capital required to be well capitalized		$ 869,000,000	$ 842,000,000
Total capital required to be well capitalized to risk weighted assets (percent)		10.00%	10.00%
Excess capital to be well capitalized		$ 2,140,000,000	$ 2,343,000,000
E TRADE Clearing [Member]
Broker Dealer Subsidiaries Net Capital [Line Items]
Required Net Capital		139,000,000	161,000,000
Net Capital		911,000,000	1,007,000,000
Excess Net Capital		772,000,000	846,000,000
Dividends from subsidiaries paid to parent company		124,000,000
E TRADE Clearing [Member] | Subsequent Event [Member]
Broker Dealer Subsidiaries Net Capital [Line Items]
Dividends from subsidiaries paid to parent company	$ 75,000,000
E TRADE Securities [Member]
Broker Dealer Subsidiaries Net Capital [Line Items]
Required Net Capital		250,000	250,000
Net Capital		59,000,000	49,000,000
Excess Net Capital		59,000,000	49,000,000
Dividends from subsidiaries paid to parent company		24,000,000
E TRADE Securities [Member] | Subsequent Event [Member]
Broker Dealer Subsidiaries Net Capital [Line Items]
Dividends from subsidiaries paid to parent company	$ 27,000,000
Other Broker Dealers [Member]
Broker Dealer Subsidiaries Net Capital [Line Items]
Required Net Capital		0	1,000,000
Net Capital		11,000,000	15,000,000
Excess Net Capital		$ 11,000,000	$ 14,000,000