Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2011

Employee Benefits (Tables) [Abstract]

Net pension cost and the amount recognized in other comprehensive income for all funded and unfunded plans

	Three months ended June 30,						Six months ended June 30,
in millions	2011			2010			2011			2010
Interest cost on PBO	$	14		$	15		$	28		$	30
Expected return on plan assets		(20	)		(18	)		(40	)		(36	)
Amortization of losses		3			9			6			18
Net pension cost	$	(3	)	$	6		$	(6	)	$	12

Net postretirement benefit cost and the amount recognized in other comprehensive income for all funded and unfunded plans

	Three months ended June 30,						Six months ended June 30,
in millions	2011			2010			2011			2010
Interest cost on APBO	$	1		$	1		$	2		$	2
Expected return on plan assets		(1	)		(1	)		(2	)		(2	)
Amortization of unrecognized prior service benefit		—			(1	)		—			(1	)
Net postretirement benefit cost		—		$	(1	)		—		$	(1	)