Stockholders' Equity (Reconciliation of Common Stock Share Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Common stock, beginning balance	958,388,000	992,020,000	1,014,027,000
Common stock, issued	4,808,000	5,932,000	8,103,000
Common stock, retired	(13,152,000)	(39,564,000)	(30,110,000)
Common stock, ending balance	950,044,000	958,388,000	992,020,000
Held in treasury, beginning balance	(87,041,000)	(87,041,000)	(87,041,000)
Held in treasury, repurchased	(13,152,000)	(39,564,000)	(30,110,000)
Held in treasury, retired	13,152,000	39,564,000	30,110,000
Held in treasury, ending balance	(87,041,000)	(87,041,000)	(87,041,000)