Retirement Plans and Other Benefits (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30,						Nine Months Ended September 30,						Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012			2013			2012			2013			2012
Service cost — benefits earned during the period	$	16		$	16		$	48		$	48		$	6		$	7		$	18		$	20
Interest cost on benefit obligation	28			30			84			90			10			12			31			35
Expected return on plan assets	(36		)	(35		)	(110		)	(106		)	(11		)	(12		)	(34		)	(34		)
Amortization of:
Prior service cost	—			—			1			1			—			—			—			—
Net actuarial loss	10			11			30			33			3			5			8			15
Net periodic benefit cost	$	18		$	22		$	53		$	66		$	8		$	12		$	23		$	36
Portion of cost charged to expense	$	10		$	12		$	29		$	25		$	5		$	7		$	14		$	13