Capital Stock (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020, 2019 and 2018: 

	Common Stock
In thousands	Issued	Treasury
Balance at January 1, 2018	448,916	35,975
Issuance of stock for various plans, net	—	(1,721)
Repurchase of stock	—	14,056
Balance at December 31, 2018	448,916	48,310
Issuance of stock for various plans, net	—	(3,416)
Repurchase of stock	—	11,906
Balance at December 31, 2019	448,916	56,800
Issuance of stock for various plans, net	—	(2,010)
Repurchase of stock	—	1,027
Balance at December 31, 2020	448,916	55,817