Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Preferred Stock, Shares Authorized	30,000,000	30,000,000
Preferred Stock, Shares Issued	0	0
Common Stock, Par or Stated Value Per Share	$ 5	$ 5
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	185,744,072	185,744,072
Treasury Stock, Shares	42,607,599	37,294,779