Parent Only Statements - Balance Sheets - Phantom (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Preferred stock, stated value (in dollars per share)	$ 0.20	$ 0.20
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.20	$ 0.20
Common stock, shares authorized (in shares)	1,125,000,000	1,125,000,000
Common stock, shares issued (in shares)	449,900,000	443,500,000
Accumulated other comprehensive loss tax benefit	$ 3,436	$ 1,696
Common stock held in treasury	14,200,000	11,100,000
Series B Preferred Stock
Condensed Financial Statements, Captions [Line Items]
Preferred stock, stated value (in dollars per share)	$ 100	$ 100
Parent Company
Condensed Financial Statements, Captions [Line Items]
Preferred stock, stated value (in dollars per share)	$ 0.20	$ 0.20
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in dollars per share)	$ 0.20	$ 0.20
Common stock, shares authorized (in shares)	1,125,000,000	1,125,000,000
Common stock, shares issued (in shares)	449,900,000	443,500,000
Accumulated other comprehensive loss tax benefit	$ 3,436	$ 1,696
Common stock held in treasury	14,200,000	11,100,000
Parent Company | Series B Preferred Stock
Condensed Financial Statements, Captions [Line Items]
Preferred stock, stated value (in dollars per share)	$ 100	$ 100
Preferred stock, shares issued	4,000,000	4,000,000