Common and Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Common: Par value $.25, 600,000,000 shares authorized
Treasury stock		38,553,358	103,340,125
Issued - December 31	296,000,000	296,000,000
Common Stock, par value and shares authorized
Common stock, par value per share	$ 0.25	$ 0.25
Common stock shares authorized	600,000,000	600,000,000
Payments For Repurchase Of Common Stock		$ 536	$ 1,256
Shares of treasury stock retired	70,000,000