Earnings Per Common Share - Dilutive Shares (Details) - shares shares in Millions |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Common Stock | |||
| Class of Stock [Line Items] | |||
| Incremental common shares attributable to dilutive effect of call options and warrants (in shares) | 143 | 150 | 150 |
| Series T Preferred Stock | |||
| Class of Stock [Line Items] | |||
| Incremental common shares attributable to dilutive effect of conversion of preferred stock (in shares) | 700 | 700 | |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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