Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Pension Plans

Employee Benefits

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

	Pension Plans
	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
	(Dollars in millions)
Service cost	$	23		23		48		45
Interest cost		135		156		270		312
Expected return on plan assets		(224)		(212)		(448)		(424)
Recognition of prior service cost		1		1		2		2
Recognition of actuarial loss		20		7		40		15
Net periodic pension benefit (income)	$	(45)		(25)		(88)		(50)

Post-Retirement Benefit Plans

Employee Benefits

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

	Post-Retirement Benefit Plans
	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
	(Dollars in millions)
Service cost	$	6		5		12		11
Interest cost		35		44		70		87
Expected return on plan assets		(10)		(11)		(20)		(22)
Recognition of actuarial loss		1		—		2		—
Net periodic post-retirement benefit expense	$	32		38		64		76