Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Common stock, par value	$ 0.30	$ 0.30
Common stock, shares authorized	1,800,000,000	1,800,000,000
Common stock, shares issued	950,044,000	958,388,000
Common stock held in treasury, shares	87,041,000	87,041,000
$4.50 Series-1,673,000 shares (callable at $120) [Member]
Preferred stock, no par value	$ 0	$ 0
Preferred stock, shares authorized	23,000,000	23,000,000
Preferred stock, shares issued	1,673,000	1,673,000
Preferred stock, redemption amount	$ 120	$ 120
$3.50 Series-700,000 shares (callable at $102) [Member]
Preferred stock, no par value	$ 0.00	$ 0.00
Preferred stock, shares authorized	23,000,000	23,000,000
Preferred stock, shares issued	700,000	700,000
Preferred stock, redemption amount	$ 102	$ 102