Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2012

Retirement Plans [Abstract]

Net Periodic Pension Expense For Qualified And Nonqualified U.S. Defined Benefit Plans

	Three Months Ended March  31,
In millions	2012			2011
Service cost	$	38		$	29
Interest cost		145			135
Expected return on plan assets		(184	)		(178	)
Actuarial loss		76			51
Amortization of prior service cost		8			8
Net periodic pension expense	$	83		$	45