Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2014

Compensation and Retirement Disclosure [Abstract]

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

Net periodic (income) expense for our qualified and non-qualified pension plans included the following components:

	Pension Plans
	Three Months Ended June 30,					Six Months Ended June 30,
	2014			2013		2014		2013
	(Dollars in millions)
Service cost	$	19		23		39		48
Interest cost	151			135		302		270
Expected return on plan assets	(223		)	(224	)	(446	)	(448	)
Recognition of prior service cost	3			1		4		2
Recognition of actuarial loss	5			20		10		40
Net periodic pension benefit income	$	(45	)	(45	)	(91	)	(88	)

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

	Post-Retirement Benefit Plans
	Three Months Ended June 30,					Six Months Ended June 30,
	2014			2013		2014		2013
	(Dollars in millions)
Service cost	$	5		6		11		12
Interest cost	40			35		79		70
Expected return on plan assets	(8		)	(10	)	(16	)	(20	)
Recognition of prior service cost	5			—		9		—
Recognition of actuarial loss	—			1		—		2
Net periodic post-retirement benefit expense	$	42		32		83		64