Note 6 - Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three months ended March 31,
In millions	2014			2013
Service cost	$	6		$	8
Interest cost		12			10
Expected return on plan assets		(16	)		(16	)
Recognized actuarial loss		5			8
Net periodic pension benefit cost	$	7		$	10

	Three months ended March 31,
In millions	2014			2013
Service cost	$	1		$	1
Interest cost		4			3
Expected return on plan assets		(2	)		(1	)
Net amortization of prior service cost		(1	)		(1	)
Recognized actuarial loss		1			2
Net periodic welfare benefit cost	$	3		$	4