Employee Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Schedule of Net Periodic Benefit Cost

The following table presents detail related to TECO Energy’s periodic benefit cost for pension and other postretirement benefits. Amounts disclosed for TECO Energy’s pension benefits include the amounts related to its qualified pension plan and non-qualified, non-contributory SERP and Restoration Plan.

TECO Energy Benefit Cost
(millions)	Pension Benefits								Other Postretirement Benefits
Three months ended June 30,	2018				2017				2018			2017
Components of net periodic benefit cost
Service cost	$	6			$	5			$	0		$	0
Interest cost		7				9				2			2
Expected return on assets		(12	)			(12	)			0			0
Amortization of:
Prior service (benefit) cost		0				0				1			1
Actuarial (gain) loss		4				4				(1	)		(1	)
Settlement cost		2		(2)		0				0			0
Net periodic benefit cost	$	7			$	6			$	2		$	2
Six months ended June 30,
Components of net periodic benefit cost
Service cost	$	11			$	10			$	1		$	1
Interest cost		14				16				4			4
Expected return on assets		(24	)			(24	)			0			0
Amortization of:
Prior service (benefit) cost		0				0				0			0
Actuarial (gain) loss		9				8				(1	)		(1	)
Settlement cost		2		(2)		7		(1)		0			0
Net periodic benefit cost	$	12			$	17			$	4		$	4

(1) Represents TECO Energy’s SERP settlement charge as a result of retirements that occurred subsequent to the Merger with Emera. The charge did not impact TEC’s financial statements.

(2) Represents TECO Energy’s SERP and Restoration Plan settlement charges as a result of the retirements of certain executives.