Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

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

Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table Text Block]

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

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

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