Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended				3 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2013 Subsequent Event [Member]	Oct. 02, 2013 Subsequent Event [Member] Series F-2 Preferred Stock [Member]	Oct. 02, 2013 Subsequent Event [Member] Series G Preferred Stock [Member]	Oct. 02, 2013 Subsequent Event [Member] Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share						$ 1.125	$ 17.50	$ 0.53
Dividends Payable						$ 134	$ 45	$ 22
Proceeds from Divestiture of Businesses	$ 6,937	[1]	$ 516	[1]	$ 611

[1] The amounts are net of cash and cash equivalents of $1,418 million at September 30, 2013 and $147 million at September 30, 2012 of business units at the time of disposition.