Employee Benefits (Tables)

6 Months Ended

Jun. 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 June 30,					Six Months Ended June 30,
	2015			2014		2015		2014
	(Dollars in millions)
Service cost	$	20		19		42		39
Interest cost	142			151		283		302
Expected return on plan assets	(223		)	(223	)	(449	)	(446	)
Recognition of prior service cost	2			3		3		4
Recognition of actuarial loss	42			5		80		10
Net periodic pension benefit income	$	(17	)	(45	)	(41	)	(91	)

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,
	2015			2014		2015		2014
	(Dollars in millions)
Service cost	$	6		5		12		11
Interest cost	35			40		70		79
Expected return on plan assets	(5		)	(8	)	(10	)	(16	)
Recognition of prior service cost	5			5		10		9
Net periodic post-retirement benefit expense	$	41		42		82		83