Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2015

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,
	2015			2014		2015		2014
	(Dollars in millions)
Service cost	$	20		19		62		58
Interest cost	142			151		425		453
Expected return on plan assets	(224		)	(223	)	(673	)	(669	)
Recognition of prior service cost	1			1		4		5
Recognition of actuarial loss	40			5		120		15
Net periodic pension benefit income	$	(21	)	(47	)	(62	)	(138	)

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,
	2015			2014		2015		2014
	(Dollars in millions)
Service cost	$	6		5		18		16
Interest cost	35			40		105		119
Expected return on plan assets	(6		)	(8	)	(16	)	(24	)
Recognition of prior service cost	6			4		16		13
Net periodic post-retirement benefit expense	$	41		41		123		124