Shareholders' Equity (Preferred Stock) (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Series D Preferred Stock [Member]	Dec. 31, 2013 Series E Preferred Stock [Member]	Dec. 31, 2013 Series F Preferred Stock [Member]	Dec. 31, 2013 Series G Preferred Stock [Member]
Schedule Of Shareholders Equity
Preferred stock, issuance date			May 01, 2012	Jul. 31, 2012	Oct. 31, 2012	May 01, 2013
Preferred stock, earliest redemption date			May 01, 2017	Aug. 01, 2017	Nov. 01, 2017	Jun. 01, 2018
Preferred stock, liquidation amount	$ 2,675		$ 575	$ 1,150	$ 450	$ 500
Preferred stock	$ 2,603	$ 2,116	$ 559	$ 1,120	$ 437	$ 487
Preferred stock, dividend rate, percentage			5.85%	5.625%	5.20%	5.20%