Retirement Plans and Other Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Retirement Plans and Other Benefits

Net periodic benefit costs and the portion of these costs charged to expense

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,
	2013			2012			2013			2012			2013			2012			2013			2012
Service cost - benefits earned during the period	$	15		$	15		$	32		$	32		$	6		$	6		$	12		$	14
Interest cost on benefit obligation	28			30			56			60			10			11			20			23
Expected return on plan assets	(36		)	(35		)	(73		)	(71		)	(12		)	(11		)	(23		)	(23		)
Amortization of:
Prior service cost	—			—			1			1			—			—			—			—
Net actuarial loss	10			12			20			22			3			4			6			10
Net periodic benefit cost	$	17		$	22		$	36		$	44		$	7		$	10		$	15		$	24
Portion of cost charged to expense	$	9		$	8		$	19		$	13		$	4		$	3		$	9		$	6