Note 6 - Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three months ended June 30,						Six months ended June 30,
In millions	2015			2014			2015			2014
Service cost	$	7		$	6		$	14		$	12
Interest cost		12			11			23			23
Expected return on plan assets		(17	)		(16	)		(33	)		(32	)
Net amortization of prior service cost (credit)		-			(1	)		(1	)		(1	)
Recognized actuarial loss		7			6			15			11
Net periodic pension benefit cost	$	9		$	6		$	18		$	13

	Three months ended June 30,						Six months ended June 30,
In millions	2015			2014			2015			2014
Service cost	$	-		$	-		$	1		$	1
Interest cost		3			3			6			7
Expected return on plan assets		(2	)		(1	)		(4	)		(3	)
Net amortization of prior service (credit) cost		(1	)		-			(1	)		(1	)
Recognized actuarial loss		2			2			3			3
Net periodic welfare benefit cost	$	2		$	4		$	5		$	7