Other Borrowings (Details - Trusts) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
ETBH Capital Trust II [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 0
Maturity Date	2031
Annual Interest Rate	10.25%
Debt instrument, interest rate, stated percentage	10.25%
ETBH Capital Trust I [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 20
Maturity Date	2031
Annual Interest Rate	3.75% above 6-month LIBOR
Debt Instrument, Basis Spread on Variable Rate	3.75%
ETBH Capital Trusts V, VI,VIII [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 51
Maturity Date	2032
Annual Interest Rate	3.25%-3.65% above 3-month LIBOR
ETBH Capital Trusts V, VI,VIII [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.65%
ETBH Capital Trusts V, VI,VIII [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.25%
ETBH Capital Trusts VII, IX-XII [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 65
Maturity Date	2033
Annual Interest Rate	3.00%-3.30% above 3-month LIBOR
ETBH Capital Trusts VII, IX-XII [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.30%
ETBH Capital Trusts VII, IX-XII [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
ETBH Capital Trusts XIII-XVII, XX [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 77
Maturity Date	2034
Annual Interest Rate	2.45%-2.90% above 3-month LIBOR
ETBH Capital Trusts XIII-XVII, XX [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.90%
ETBH Capital Trusts XIII-XVII, XX [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.45%
ETBH Capital Trusts XIX, XXI, XXII [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 60
Maturity Date	2035
Annual Interest Rate	2.20%-2.40% above 3-month LIBOR
ETBH Capital Trusts XIX, XXI, XXII [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.40%
ETBH Capital Trusts XIX, XXI, XXII [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.20%
ETBH Capital Trusts XXIII-XXIV [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 45
Maturity Date	2036
Annual Interest Rate	2.10% above 3-month LIBOR
Debt Instrument, Basis Spread on Variable Rate	2.10%
ETBH Capital Trusts XXV-XXX [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 96
Maturity Date	2037
Annual Interest Rate	1.90%-2.00% above 3-month LIBOR
ETBH Capital Trusts XXV-XXX [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
ETBH Capital Trusts XXV-XXX [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
ETBH Capital Trust Total [Member]
Debt Instrument [Line Items]
Face Value (in dollars)	$ 414

The year when the debt instrument is scheduled to be fully repaid.

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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