Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of Common and Preferred Stock

Common and preferred stock consists of the following:

Common Stock, $1 Par Value	December 2017
	(Units in Millions)
Common Shares Authorized	1,800
Common Shares Issued and Outstanding	890
Preferred Stock
Preferred Shares Authorized	25
Preferred Shares Issued and Outstanding	—