Stockholder's Equity (Summary of Stockholders' Equity Capital Accounts) (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Preferred Stock, $1.00 par value:
Preferred Stock, par value (in USD per share)	$ 1.00	$ 1.00
Authorized shares (in shares)	50,000,000	50,000,000
Issued shares (in shares)	14,375,000	14,375,000
Outstanding shares (in shares)	14,369,965	14,370,060	25,875,000	25,875,000
Common Stock, $1.00 par value:
Common Stock, par value (in USD per share)	$ 1.00	$ 1.00
Authorized shares (in shares)	700,000,000	700,000,000
Issued shares (in shares)	384,849,236	372,852,311
Outstanding shares (in shares)	383,674,603	371,731,551