Earnings Per Share (Note)

3 Months Ended

Mar. 31, 2015

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

Earnings Per Share Disclosure [Text Block]

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, shares of the following securities and associated adjustments to net income, representing dividends on preferred stock, 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, 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

For the Prior Quarter, all outstanding equity securities convertible into common stock were included in the calculation of diluted EPS. A reconciliation of basic EPS and diluted EPS for the Prior Quarter is as follows: 

	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share Amount
	(in millions, except per share data)
Three Months Ended March 31, 2014
Basic EPS	$	374	658	$	0.57
Effect of Dilutive Securities:
Assumed conversion as of the beginning of the period     of preferred shares outstanding during the period:
Common shares assumed issued for 5.75% cumulative convertible preferred stock	21		56
Common shares assumed issued for 5.75% cumulative convertible preferred stock (series A)	16		39
Common shares assumed issued for 5.00% cumulative convertible preferred stock (series 2005B)	3		5
Common shares assumed issued for 4.50% cumulative convertible preferred stock	3		6
Outstanding stock options	—		1
Diluted EPS	$	417	765	$	0.54