Pension Plans and Postretirement Other Than Pensions (Tables)

6 Months Ended

Jun. 30, 2012

Pension Plans

Pension and Other Postretirement Benefits

Expense Components for Pension Plan

Expense components are:

	Three months ended June 30,						Six months ended June 30,
(in millions)	2012			2011			2012			2011
Service cost	$	37		$	38		$	74		$	76
Interest cost	45			47			90			94
Expected return on plan assets	(55		)	(56		)	(110		)	(112		)
Amortization of prior service cost	1			2			2			4
Amortization of net loss	15			4			30			8
Expense under accounting standards	$	43		$	35		$	86		$	70
Regulatory adjustment (deferred)	27			(6		)	54			(12		)
Total expense recognized	$	70		$	29		$	140		$	58

Postretirement Benefits Other Than Pensions

Pension and Other Postretirement Benefits

Expense Components for Pension Plan

Expense components are:

	Three months ended June 30,						Six months ended June 30,
(in millions)	2012			2011			2012			2011
Service cost	$	12		$	10		$	24		$	20
Interest cost	28			31			56			62
Expected return on plan assets	(27		)	(27		)	(54		)	(54		)
Amortization of prior service credit	(9		)	(9		)	(18		)	(18		)
Amortization of net loss	11			9			22			18
Total expense	$	15		$	14		$	30		$	28