Earnings Per Common Share (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2011 Series B Preferred Stock [Member]
Earning Per common Share (Detail Textual) [Abstract]
Amortization of discount on preferred stock including deemed dividend	$ 49,000,000
Repurchase of the Fixed-Rate Perpetual Preferred Stock		$ 2,500,000,000