Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred Stock, par value per share (in dollars per share)	$ 1	$ 1.00
Preferred Stock, shares authorized (in shares)	4,000,000	4,000,000
Common Stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	1,000,000,000	500,000,000
Common Stock, Shares, Issued	471,360,427	469,718,512
Treasury Stock, Shares	37,961,316	37,925,625