Earnings Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 247	$ 179
Preferred stock dividends	(15)	(67)
Net income (loss) from continuing operations attributable to common shareholders	232	112
Income (loss) from discontinued operations, net of tax	3	397
Net income (loss) attributable to common shareholders	$ 235	$ 509
Basic weighted-average common shares outstanding	484,233,246	482,247,935
Diluted weighted-average common shares outstanding	484,654,229	482,781,619
Earnings Per Share, Basic [Abstract]
Net income from continuing operations	$ 0.48	$ 0.23
Income from discontinued operations, net of tax	0.01	0.82
Net income	0.49	1.06
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations	0.48	0.23
Income from discontinued operations, net of tax	0.01	0.82
Net income	$ 0.49	$ 1.06