Goodwill And Identifiable Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015		Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill before impairment charges								$ 18,322
Accumulated noncash impairment charges	$ (17,370)				$ (17,370)			(15,970)
Balance at September 30, 2015 (a)	952	[1]			952	[1]		$ 2,352
Additional noncash impairment charges in 2015	$ (700)		$ (700)	$ 0	$ (1,400)		$ 0

[1] Net of accumulated impairment charges totaling $17.37 billion.