Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

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

Antidilutive Securities Excluded From Computation Of Earnings Per Share

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, 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
Three Months Ended June 30, 2014
Common stock equivalent of our preferred stock outstanding:
5.75% cumulative convertible preferred stock	$	22	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	$	3	3

	Net Income Adjustments		Shares
	($ in millions)		(in millions)
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
Six Months Ended June 30, 2014
Common stock equivalent of our preferred stock outstanding:
5.00% cumulative convertible preferred stock (series 2005B)	$	5	6
4.50% cumulative convertible preferred stock	$	6	6
Participating securities	$	11	3

Schedule of Earnings Per Share, Basic and Diluted

A reconciliation of basic EPS and diluted EPS for the Prior Period is as follows:

	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share Amount
	(in millions, except per share data)
Six Months Ended June 30, 2014
Basic EPS	$	518	658	$	0.79
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	43		59
Common shares assumed issued for 5.75% cumulative convertible preferred stock (series A)	32		42
Outstanding stock options	—		1
Diluted EPS	$	593	760	$	0.78