Capital Stock (Rollforward Of Common Stock Activity) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock, beginning balance	448,900
Treasury stock, beginning balance	28,734
Common stock, ending balance	448,900	448,900
Treasury stock, ending balance	36,776	28,734
Common Stock Issued [Member]
Class of Stock [Line Items]
Common stock, beginning balance	448,854	447,222	439,894
Issuance of stock for various plans, net	62	1,632	7,328
Repurchase of stock, common shares	0	0	0
Common stock, ending balance	448,916	448,854	447,222
Treasury Stock [Member]
Class of Stock [Line Items]
Treasury stock, beginning balance	28,734	10,868	13
Stock Issued During Period, Shares, Period Increase (Decrease)	(4,230)	(4,668)	(533)
Repurchase of stock, treasury stock	12,272	22,534	11,388
Treasury stock, ending balance	36,776	28,734	10,868