Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Summary of the components of net periodic benefit cost recognized for pension plans

		Qualified Plan				Nonqualified Plans
		Three Months Ended June 30,				Three Months Ended June 30,
		2013		2012		2013		2012
		(Dollars in millions)
Service cost		$	37	$	29	$	3	$	2
Interest cost			27		24		4		2
Estimated return on plan assets			(64)		(49)		―		―
Amortization and other			20		17		3		1
	Net periodic benefit cost	$	20	$	21	$	10	$	5

		Qualified Plan				Nonqualified Plans
		Six Months Ended June 30,				Six Months Ended June 30,
		2013			2012	2013		2012
		(Dollars in millions)
Service cost		$	74	$	58	$	6	$	4
Interest cost			54		49		7		5
Estimated return on plan assets			(128)		(98)		―		―
Amortization and other			40		34		6		2
	Net periodic benefit cost	$	40	$	43	$	19	$	11