Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2016

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 March 31,
	2016			2015
	(Dollars in millions)
Service cost	$	17		22
Interest cost	107			141
Expected return on plan assets	(184		)	(226	)
Recognition of prior service (credit) cost	(2		)	1
Recognition of actuarial loss	42			38
Net periodic pension benefit income	$	(20	)	(24	)

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

	Post-Retirement Benefit Plans
	Three Months Ended March 31,
	2016			2015
	(Dollars in millions)
Service cost	$	5		6
Interest cost	28			35
Expected return on plan assets	(2		)	(5	)
Recognition of prior service cost	5			5
Net periodic post-retirement benefit expense	$	36		41