Note 7 - Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

In millions	2013		2012		2011
Compensation costs (1)	$	22	$	9	$	14
Income tax benefits (1)		1		1		1
Excess tax benefits (2)		-		1		1

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Number of options			Weighted average exercise price		Weighted average remaining life (in years)		Aggregate intrinsic value (in millions)
Outstanding - December 31, 2010		2,229,112		$	34.85
Granted		1,685			42.19
Exercised		(383,646	)		31.11
Forfeited		(23,997	)		37.70
Outstanding - December 31, 2011		1,823,154		$	35.61
Granted		-			-
Exercised		(234,844	)		32.07
Forfeited		(59,720	)		37.34
Outstanding - December 31, 2012 (1)		1,528,590		$	36.09		3.7	$	6
Granted		-			-		-
Exercised		(617,358	)		35.37		2.3
Forfeited		(12,500	)		38.36		2.6
Outstanding - December 31, 2013 (1) (2)		898,732		$	36.55		3.0	$	10

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

In millions	Measurement period end date	Fair value accrued at December 31, 2013		Maximum aggregate payout
Granted in 2011	December 31, 2013	$	7	$	12
Granted in 2012	December 31, 2014	$	6	$	18
Granted in 2013	December 31, 2015	$	3	$	18

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Shares of restricted stock			Weighted average remaining vesting period (in years)		Weighted average fair value
Outstanding - December 31, 2011 (1)		477,354				$	34.40
Issued		268,840					40.08
Forfeited		(28,829	)				39.07
Vested		(214,274	)				36.45
Outstanding - December 31, 2012 (1)		503,091			1.8	$	39.44
Issued		175,935			2.8		42.41
Forfeited		(33,352	)		2.0		40.64
Vested		(204,421	)		0.0		38.71
Outstanding - December 31, 2013 (1)		441,253			1.8	$	40.82

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

	2013		2012		2011
Shares purchased on the open market		103,343		108,132		65,843
Average per-share purchase price	$	42.96	$	38.96	$	40.55
Total purchase price discount	$	664,286	$	618,278	$	401,346