(Rollforward Of Common Stock Activity) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Common stock, beginning balance	448,900
Treasury stock, beginning balance	55,800
Common stock, ending balance	448,900	448,900
Treasury stock, ending balance	70,400	55,800
Issued
Class of Stock [Line Items]
Common stock, beginning balance	448,916	448,916	448,916
Issuance of stock for various plans, net	0	0	0
Repurchase of stock	0	0	0
Common stock, ending balance	448,916	448,916	448,916
Treasury
Class of Stock [Line Items]
Treasury stock, beginning balance	55,817	56,800	48,310
Issuance of stock for various plans, net	(1,855)	(2,010)	(3,416)
Repurchase of stock	16,400	1,027	11,906
Treasury stock, ending balance	70,362	55,817	56,800