Stockholders' Equity (Reconciliation of Common Stock Share Activity) (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity Note [Abstract]
Common stock, beginning balance	992,020,000	1,014,027,000	1,020,057,000
Common stock, issued	5,932,000	8,103,000	14,370,000
Common stock, retired	(39,564,000)	(30,110,000)	(20,400,000)
Common stock, ending balance	958,388,000	992,020,000	1,014,027,000
Held in treasury, beginning balance	(87,041,000)	(87,041,000)	(87,041,000)
Held in treasury, repurchased	(39,564,000)	(30,110,000)	(20,400,000)
Held in treasury, retired	39,564,000	30,110,000	20,400,000
Held in treasury, ending balance	(87,041,000)	(87,041,000)	(87,041,000)