Preferred Stock Textuals (Details)	1 Months Ended	6 Months Ended
	Jan. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) vote $ / shares shares	Dec. 31, 2014 USD ($) shares
Preferred Stock (Textual) [Abstract]
Par value		$ 23,048,000,000	$ 20,612,000,000
Shares issued and outstanding | shares		11,654,402	11,138,818
Voting Rights		If issued, preference shares would be limited to one vote per share
Additional paid-in capital included related to preferred stock		$ 148,000,000	$ 109,000,000
Preferred Stock, No Voting Rights [Member]
Preferred Stock (Textual) [Abstract]
Preferred shares authorized | shares		20,000,000
Par value		$ 0
Preferred Stock, Voting Rights [Member]
Preferred Stock (Textual) [Abstract]
Preferred shares authorized | shares		4,000,000
Par value		$ 0
Number of votes per share | vote		1
Shares issued and outstanding | shares		0
Series G - 7.25% Class A Preferred Stock [Member]
Preferred Stock (Textual) [Abstract]
Preferred stock, commitment to issue		$ 0
Series H - Floating Class A Preferred Stock [Member]
Preferred Stock (Textual) [Abstract]
Preferred stock, commitment to issue		0
Series U - 5.875% Fixed-to-Floating Non-Cumulative Perpetual Class A Preferred Stock [Member]
Preferred Stock (Textual) [Abstract]
Par value	$ 2,000,000,000	$ 2,000,000,000	$ 0
Shares issued and outstanding | shares		80,000	0
Depositary shares issued and outstanding | shares	2,000,000
Percentage Interest in a share of issued preferred stock	4.00%
Stock Compensation Plan [Member] | Convertible Preferred Stock [Member]
Preferred Stock (Textual) [Abstract]
Preferred stock, redemption price per share | $ / shares		$ 1,000