Earnings Per Share (Note)

12 Months Ended

Dec. 31, 2013

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 issuance of common shares for all potentially dilutive securities, provided the effect is not antidilutive. For the years ended December 31, 2013, 2012 and 2011, 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 years ended December 31, 2013 and 2012, our cumulative convertible preferred stock and participating securities and associated adjustments to net income, consisting of dividends on such shares, were excluded from the calculation of diluted EPS, as the effect was antidilutive. The impact of our stock options was immaterial in the calculation of diluted EPS for these two years. The following table sets forth the net income adjustments and shares of common stock related to our outstanding cumulative convertible preferred stock and participating securities in 2013 and 2012:

	Net Income Adjustments		Shares
	($ in millions)		(in millions)
Year Ended December 31, 2013:
Common stock equivalent of our preferred stock outstanding:
5.75% cumulative convertible preferred stock	$	86	56
5.75% cumulative convertible preferred stock (series A)	$	63	40
5.00% cumulative convertible preferred stock (series 2005B)	$	10	5
4.50% cumulative convertible preferred stock	$	12	6
Participating securities	$	10	5
Year Ended December 31, 2012:
Common stock equivalent of our preferred stock outstanding:
5.75% cumulative convertible preferred stock	$	86	56
5.75% cumulative convertible preferred stock (series A)	$	63	39
5.00% cumulative convertible preferred stock (series 2005B)	$	10	5
4.50% cumulative convertible preferred stock	$	12	6
Participating securities	$	—	5

For the year ended December 31, 2011, all outstanding equity securities that were convertible into common stock were included in the calculation of diluted EPS. A reconciliation of basic EPS and diluted EPS for the year ended December 31, 2011 is as follows: 

	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share Amount
	(in millions, except per share data)
For the Year Ended December 31, 2011:
Basic EPS	$	1,570	637	$	2.47
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	86		55
Common shares assumed issued for 5.75% cumulative convertible preferred stock (series A)	63		39
Common shares assumed issued for 5.00% cumulative convertible preferred stock (series 2005B)	11		5
Common shares assumed issued for 4.50% cumulative convertible preferred stock	12		6
Participating securities	—		9
Outstanding stock options	—		1
Diluted EPS	$	1,742	752	$	2.32