Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

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 March 31,				Three Months Ended March 31,
		2012		2011		2012		2011
		(Dollars in millions)
Service cost		$	29	$	26	$	2	$	2
Interest cost			25		23		3		2
Estimated return on plan assets			(49)		(49)		―		―
Amortization and other			17		7		1		1
	Net periodic benefit cost	$	22	$	7	$	6	$	5