Earnings Per Share (Note)

6 Months Ended

Jun. 30, 2016

Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]

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, the Prior Quarter, the Current Period and the Prior Period, 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, the Prior Quarter, the Current Period and the Prior Period, 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 June 30, 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)	$	2	6
4.50% cumulative convertible preferred stock	$	3	6
Participating securities	$	—	1

Three Months Ended June 30, 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	$	—	1

Six Months Ended June 30, 2016
Common stock equivalent of our preferred stock outstanding:
5.75% cumulative convertible preferred stock	$	42	58
5.75% cumulative convertible preferred stock (series A)	$	32	42
5.00% cumulative convertible preferred stock (series 2005B)	$	5	6
4.50% cumulative convertible preferred stock	$	6	6
Participating securities	$	—	1

Six Months Ended June 30, 2015
Common stock equivalent of our preferred stock outstanding:
5.75% cumulative convertible preferred stock	$	43	59
5.75% cumulative convertible preferred stock (series A)	$	32	42
5.00% cumulative convertible preferred stock (series 2005B)	$	5	6
4.50% cumulative convertible preferred stock	$	6	6
Participating securities	$	—	2