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 (income)

	Pension Plans
	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
	(Dollars in millions)
Service cost	$	14		15		30		29
Interest cost		83		97		167		196
Expected return on plan assets		(149)		(144)		(298)		(288)
Recognition of actuarial loss		2		—		3		—
Net periodic pension benefit (income)	$	(50)		(32)		(98)		(63)

Post-Retirement Benefit Plans

Employee Benefits

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

	Post-Retirement Benefit Plans
	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
	(Dollars in millions)
Service cost	$	3		2		6		4
Interest cost		29		37		58		73
Expected return on plan assets		(9)		(10)		(18)		(21)
Recognition of actuarial loss		1		—		2		—
Net periodic post-retirement benefit expense	$	24		29		48		56