Defined benefit plan assumptions used calculating benefit obligation immediate rate.

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- Definition

Defined benefit plan assumptions used calculating benefit obligation ultimate rate.

+ References

No definition available.

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- References

No definition available.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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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.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

The ultimate trend rate for health care costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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Employee Postretirement Benefits - Schedule of Assumptions Used to Determine Benefit (Detail)	2 Months Ended		8 Months Ended	12 Months Ended
	Dec. 31, 2014	Oct. 30, 2014	Sep. 01, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.258%			4.688%	4.258%
Rate of compensation increase—weighted	3.87%			3.87%	3.87%
Discount rate	4.331%	4.277%	5.118%	4.258%		4.196%
Expected long-term return on plan assets	7.00%	7.00%	7.25%	7.00%		7.50%
Rate of compensation increase	3.73%			3.87%		3.76%
Pension Benefits [Member] \| Tampa Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.258%			4.688%	4.258%
Rate of compensation increase—weighted	3.87%			3.87%	3.87%
Discount rate	4.331%	4.277%	5.118%	4.258%		4.196%
Expected long-term return on plan assets	7.00%	7.00%	7.25%	7.00%		7.50%
Rate of compensation increase				3.87%	3.73%	3.76%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.211%			4.669%	4.211%
Rate of compensation increase—weighted	3.86%			2.50%	3.86%
Healthcare cost trend rate
Immediate rate	7.09%			7.05%	7.09%
Ultimate rate	4.57%			4.50%	4.57%
Year rate reaches ultimate	2025			2038	2025
Other Postretirement Benefits [Member] \| Tampa Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.211%			4.669%	4.211%
Rate of compensation increase—weighted	3.86%			2.50%	3.86%
Healthcare cost trend rate
Immediate rate	7.09%			7.05%	7.09%
Ultimate rate	4.57%			4.50%	4.57%
Year rate reaches ultimate	2025			2038	2025
Other Postretirement Benefits [Member] \| Net Periodic Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate				4.211%	5.096%	4.18%
Expected long-term return on plan assets				5.75%	5.75%
Rate of compensation increase				3.86%	3.71%	3.74%
Healthcare cost trend rate
Immediate rate				7.09%	7.25%	7.50%
Ultimate rate				4.57%	4.50%	4.50%
Year rate reaches ultimate	2025			2025	2025	2025
Other Postretirement Benefits [Member] \| Net Periodic Benefit Cost [Member] \| Tampa Electric Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate				4.211%	5.096%	4.18%
Expected long-term return on plan assets				5.75%	5.75%
Rate of compensation increase				3.86%	3.71%	3.74%
Healthcare cost trend rate
Immediate rate				7.09%	7.25%	7.50%
Ultimate rate				4.57%	4.50%	4.50%
Year rate reaches ultimate	2025			2025	2025	2025