Borrowing Facility, Accounts Receivable

No definition available.

Name:	te_BorrowingFacilityAccountsReceivable
Namespace Prefix:	te_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the fees for amounts available, but unused under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase for additional borrowings on the credit facility during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

+ Details

Name:	us-gaap_LineOfCreditFacilityIncreaseAdditionalBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Short-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	15 Months Ended				11 Months Ended	15 Months Ended						12 Months Ended		1 Months Ended	15 Months Ended			15 Months Ended		12 Months Ended
	Oct. 25, 2011	Dec. 31, 2012	Feb. 15, 2013	Dec. 31, 2011	Oct. 25, 2011 Previous Agreement [Member]	Dec. 31, 2012 TAMPA ELECTRIC CO [Member]	Dec. 31, 2012 TAMPA ELECTRIC CO [Member]	Feb. 15, 2013 TAMPA ELECTRIC CO [Member]	Feb. 15, 2012 TAMPA ELECTRIC CO [Member]	Dec. 31, 2011 TAMPA ELECTRIC CO [Member]	Oct. 25, 2011 TAMPA ELECTRIC CO [Member]	Mar. 25, 2011 TAMPA ELECTRIC CO [Member]	Dec. 31, 2012 TAMPA ELECTRIC CO [Member] Minimum [Member]	Dec. 31, 2012 TAMPA ELECTRIC CO [Member] Maximum [Member]	Oct. 25, 2012 TAMPA ELECTRIC CO [Member] Amended And Restated Credit Agreement [Member]	Dec. 31, 2012 TAMPA ELECTRIC CO [Member] Amended And Restated Credit Agreement [Member]	Oct. 25, 2011 TAMPA ELECTRIC CO [Member] Previous Agreement [Member]	Mar. 25, 2011 TAMPA ELECTRIC CO [Member] Previous Agreement [Member]	Dec. 31, 2012 Teco Finance [Member]	Feb. 15, 2013 Teco Energy [Member]	Dec. 31, 2012 Teco Energy [Member] Minimum [Member]	Dec. 31, 2012 Teco Energy [Member] Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fees, basis points													12.5	30.0							12.5	30.0
Borrowing facility, accounts receivable									$ 150											$ 150
Debt instrument maturity date	May 9, 2012 to Oct. 25, 2016					Feb. 14, 2014									May 9, 2012 to Oct. 25, 2016	May 9, 2012 to Oct. 25, 2016
Amended credit facility	200.0	675.0	150.0	675.0	50.0	475.0	475.0	150.0		475.0	200.0	200.0			325.0		50.0	50.0
Interest rate description		TECO Finance to borrow funds at an interest rate equal to the London interbank deposit rate plus a margin; (iv) as an alternative to the above interest rate, allows TECO Finance to borrow funds at an interest rate equal to a margin plus the higher of the JPMorgan Chase Bank's prime rate, the federal funds rate plus 50 basis points, or the London interbank deposit rate plus 1.00%					TEC to borrow funds at a rate equal to the London interbank deposit rate plus a margin; (iii) allows TEC to borrow funds at an interest rate equal to a margin plus the higher of Citibank's prime rate, the federal funds rate plus 50 basis points, or the London interbank deposit rate plus 1.00%
Increase of credit facility							$ 175												$ 100