Retirement Plans (Tables) (Pension Plans, Defined Benefit [Member])

6 Months Ended

Jun. 30, 2011

Pension Plans, Defined Benefit [Member]

Components Of Postretirement Benefit Expense

	Three Months Ended June  30,						Six Months Ended June  30,
In millions	2011			2010			2011			2010
Service cost	$	31		$	29		$	60		$	58
Interest cost		137			134			272			270
Expected return on plan assets		(179	)		(157	)		(357	)		(315	)
Actuarial loss		55			43			106			87
Amortization of prior service cost		8			8			16			16
Net periodic pension expense	$	52		$	57		$	97		$	116