Retirement Plans and Other Benefits (Tables)

6 Months Ended

Jun. 30, 2014

Retirement Plans and Other Benefits

Schedule of net periodic benefit costs and the portion of these costs charged to expense (including administrative costs and excluding amounts capitalized as overhead construction, billed to electric plant participants or charged or amortized to the regulatory asset)

The following table provides details of the plans’ net periodic benefit costs and the portion of these costs charged to expense (including administrative costs and excluding amounts capitalized as overhead construction, billed to electric plant participants or charged or amortized to the regulatory asset) (dollars in millions):

	Pension Benefits												Other Benefits
	Three Months Ended June 30,						Six Months Ended June 30,						Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013			2014			2013			2014			2013
Service cost — benefits earned during the period	$	12		$	15		$	27		$	32		$	5		$	6		$	9		$	12
Interest cost on benefit obligation	33			28			65			56			11			10			23			20
Expected return on plan assets	(39		)	(36		)	(79		)	(73		)	(13		)	(12		)	(25		)	(23		)
Amortization of:
Prior service cost	—			—			—			1			—			—			—			—
Net actuarial loss	3			10			5			20			—			3			—			6
Net periodic benefit cost	$	9		$	17		$	18		$	36		$	3		$	7		$	7		$	15
Portion of cost charged to expense	$	5		$	9		$	11		$	19		$	3		$	4		$	5		$	9