Retirement Plans and Other Benefits (Tables)

3 Months Ended

Mar. 31, 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 March 31,						Three Months Ended March 31,
	2013			2012			2013			2012
Service cost - benefits earned during the period	$	17		$	16		$	6		$	7
Interest cost on benefit obligation	29			30			10			12
Expected return on plan assets	(37		)	(35		)	(11		)	(11		)
Amortization of net actuarial loss	9			11			3			6
Net periodic benefit cost	$	18		$	22		$	8		$	14
Portion of cost charged to expense	$	10		$	6		$	5		$	3