Pension Plans and Postretirement Benefits Other Than Pensions (Tables)

6 Months Ended

Jun. 30, 2012

Pension Plans

Pension and Other Postretirement Benefits

Expense Components for Plans

Expense components are:

	Three months ended June 30,						Six months ended June 30,
(in millions)	2012			2011			2012			2011
Service cost	$	43		$	43		$	86		$	86
Interest cost	49			52			98			104
Expected return on plan assets	(59		)	(60		)	(118		)	(120		)
Amortization of prior service cost	1			2			2			4
Amortization of net loss	18			6			36			12
Expense under accounting standards	52			43			104			86
Regulatory adjustment (deferred)	27			(6		)	54			(12		)
Total expense recognized	$	79		$	37		$	158		$	74

Postretirement Benefits Other Than Pensions

Pension and Other Postretirement Benefits

Expense Components for Plans

Expense components are:

	Three months ended June 30,						Six months ended June 30,
(in millions)	2012			2011			2012			2011
Service cost	$	13		$	11		$	26		$	22
Interest cost	30			33			60			66
Expected return on plan assets	(27		)	(28		)	(54		)	(56		)
Amortization of prior service credit	(9		)	(9		)	(18		)	(18		)
Amortization of net loss	12			9			24			18
Total expense	$	19		$	16		$	38		$	32