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Parent Only Statements - Balance Sheets (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Condensed Financial Statements, Captions [Line Items] |  |
Preferred stock, stated value (in dollars per share) | $ 0.20 | $ 0.20
Preferred stock, shares authorized | 20,000,000 | 20,000,000
Common stock, par value (in dollars per share) | $ 0.20 | $ 0.20
Common stock, shares authorized | 1,125,000,000.000 | 1,125,000,000.000
Common stock, shares issued | 430,700,000 | 424,800,000
Accumulated other comprehensive loss tax benefit | $ (9,949) | $ (7,186)
Common stock held in treasury | 4,400,000 | 1,400,000
Series A Preferred Stock |  |
Condensed Financial Statements, Captions [Line Items] |  |
Preferred stock, stated value (in dollars per share) | $ 50 | $ 50
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 | 20,000,000 | 20,000,000
Common stock, par value (in dollars per share) | $ 0.20 | $ 0.20
Common stock, shares authorized | 1,125,000,000.000 | 1,125,000,000.000
Common stock, shares issued | 431,000,000 | 425,000,000
Accumulated other comprehensive loss tax benefit | $ 9,949 | $ 7,186
Common stock held in treasury | 4,000,000 | 1,000,000
Parent Company | Series A Preferred Stock |  |
Condensed Financial Statements, Captions [Line Items] |  |
Preferred stock, stated value (in dollars per share) | $ 50 | $ 50
Preferred stock, shares issued | 3,300,000 | 3,300,000
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

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