Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Pension Plans

Employee Benefits

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

Net periodic pension benefit (income) expense included the following components:

	Pension Plans
	Three Months Ended September 30,					Nine Months Ended September 30,
	2013			2012		2013		2012
	(Dollars in millions)
Service cost	$	13		15		43		44
Interest cost	83			97		250		293
Expected return on plan assets	(149		)	(144	)	(447	)	(432	)
Recognition of actuarial loss	2			—		5		—
Net periodic pension benefit (income) expense	$	(51	)	(32	)	(149	)	(95	)

Post-Retirement Benefit Plans

Employee Benefits

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

Net periodic post-retirement benefit expense (income) included the following components:

	Post-Retirement Benefit Plans
	Three Months Ended September 30,					Nine Months Ended September 30,
	2013			2012		2013		2012
	(Dollars in millions)
Service cost	$	3		2		9		6
Interest cost	30			37		88		110
Expected return on plan assets	(9		)	(10	)	(27	)	(31	)
Recognition of actuarial loss	1			—		3		—
Net periodic post-retirement benefit expense (income)	$	25		29		73		85