Capital Stock (Tables)

12 Months Ended

Dec. 31, 2017

Class of Stock Disclosures [Abstract]

Rollforward Of Common Stock Activity [Table Text Block]

The following is a rollforward of shares of common stock for the three years ended December 31, 2017, 2016 and 2015:

	Common Stock
In thousands	Issued	Treasury
Balance at January 1, 2015	448,854	28,734
Issuance of stock for various plans, net	62	(4,230	)
Repurchase of stock	—	12,272
Balance at December 31, 2015	448,916	36,776
Issuance of stock for various plans, net	—	(2,745	)
Repurchase of stock	—	3,640
Balance at December 31, 2016	448,916	37,671
Issuance of stock for various plans, net	—	(2,577	)
Repurchase of stock	—	881
Balance at December 31, 2017	448,916	35,975