Earnings Per Common Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 357	$ 169	$ 604	$ 348
Preferred stock dividends	(15)	(1,251)	(30)	(1,318)
Net income (loss) from continuing operations attributable to common shareholders	342	(1,082)	574	(970)
Income (loss) from discontinued operations, net of tax	3	13	6	410
Net income (loss) attributable to common shareholders	$ 345	$ (1,069)	$ 580	$ (560)
Basic weighted-average common shares outstanding	485,370,318	482,847,164	484,801,782	482,550,842
Diluted weighted-average common shares outstanding	486,074,474	482,847,164	485,364,351	482,550,842
Stock Repurchase and Redemption Premium				$ 1,193
Earnings Per Share, Basic [Abstract]
Net income from continuing operations	$ 0.70	$ (2.24)	$ 1.18	$ (2.01)
Income from discontinued operations, net of tax	0.01	0.03	0.01	0.85
Net income	0.71	(2.22)	1.20	(1.16)
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations	0.70	(2.24)	1.18	(2.01)
Income from discontinued operations, net of tax	0.01	0.03	0.01	0.85
Net income	$ 0.71	$ (2.22)	$ 1.19	$ (1.16)