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Earnings Per Share (Note) | 3 Months Ended
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Mar. 31, 2016
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] |
Earnings Per Share Disclosure | Earnings Per Share Basic earnings per share (EPS) is calculated using the weighted average number of common shares outstanding during the period and includes the effect of any participating securities as appropriate. Participating securities consist of unvested restricted stock issued to our employees and non-employee directors that provide dividend rights. Diluted EPS is calculated assuming the issuance of common shares for all potentially dilutive securities, provided the effect is not antidilutive. For the Current Quarter and the Prior Quarter, our contingent convertible senior notes did not have a dilutive effect and therefore were excluded from the calculation of diluted EPS. See Note 3 for further discussion of our contingent convertible senior notes. For the Current Quarter and the Prior Quarter, shares of the following securities and associated adjustments to net income, representing dividends on preferred stock and allocated earnings on participating securities, were excluded from the calculation of diluted EPS as the effect was antidilutive.
|  | Net Income Adjustments |  | Shares
|  | ($ in millions) |  | (in millions)
Three Months Ended March 31, 2016 |  |  |  |
Common stock equivalent of our preferred stock outstanding: |  |  |  |
5.75% cumulative convertible preferred stock |  | $ | 21 |  |  | 58 |
5.75% cumulative convertible preferred stock (series A) |  | $ | 16 |  |  | 42 |
5.00% cumulative convertible preferred stock (series 2005B) |  | $ | 3 |  |  | 6 |
4.50% cumulative convertible preferred stock |  | $ | 3 |  |  | 6 |
Participating securities |  | $ | — |  |  | 1 |
Three Months Ended March 31, 2015 |  |  |  |
Common stock equivalent of our preferred stock outstanding: |  |  |  |
5.75% cumulative convertible preferred stock |  | $ | 21 |  |  | 59 |
5.75% cumulative convertible preferred stock (series A) |  | $ | 16 |  |  | 42 |
5.00% cumulative convertible preferred stock (series 2005B) |  | $ | 3 |  |  | 6 |
4.50% cumulative convertible preferred stock |  | $ | 3 |  |  | 6 |
Participating securities |  | $ | — |  |  | 2 |

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