Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Pension Plans

Employee Benefits

Schedule of components of net periodic pension benefit (income) expense and post-retirement benefit expense (income)

	Pension Plans
	Three Months Ended March 31,
	2013		2012
	(Dollars in millions)
Service cost	$	16		15
Interest cost		84		97
Expected return on plan assets		(149)		(144)
Total net periodic pension benefit income	$	(49)		(32)

Post-Retirement Benefit Plans

Employee Benefits

Schedule of components of net periodic pension benefit (income) expense and post-retirement benefit expense (income)

	Post-Retirement Benefit Plans
	Three Months Ended March 31,
	2013		2012
	(Dollars in millions)
Service cost	$	3		2
Interest cost		29		37
Expected return on plan assets		(9)		(10)
Recognized net actuarial loss		1		—
Total net periodic post-retirement benefit expense	$	24		29