Employee Benefits (Tables)

9 Months Ended

Sep. 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 September 30,					Nine Months Ended September 30,
	2014			2013		2014		2013
	(Dollars in millions)
Service cost	$	19		22		58		70
Interest cost	151			137		453		407
Expected return on plan assets	(223		)	(224	)	(669	)	(672	)
Recognition of prior service cost	1			1		5		4
Recognition of actuarial loss	5			20		15		61
Net periodic pension benefit income	$	(47	)	(44	)	(138	)	(130	)

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

	Post-Retirement Benefit Plans
	Three Months Ended September 30,					Nine Months Ended September 30,
	2014			2013		2014		2013
	(Dollars in millions)
Service cost	$	5		6		16		18
Interest cost	40			35		119		105
Expected return on plan assets	(8		)	(10	)	(24	)	(30	)
Recognition of prior service cost	4			—		13		—
Recognition of actuarial loss	—			1		—		3
Net periodic post-retirement benefit expense	$	41		32		124		96