Balance Sheets - Parent Company Only (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Cash and Due from Banks	$ 7,047		$ 4,258
Interest-bearing Deposits in Banks and Other Financial Institutions	22		22
Cash and Cash Equivalents, at Carrying Value	8,229		5,263		8,257	4,509
Trading assets	6,202	[1]	5,040	[1]
Available-for-sale Securities	26,770	[2]	22,542	[2]
Goodwill	6,337		6,369		6,369
Other Assets	5,656		5,690
Assets	190,328		175,335
Liabilities and Shareholders' Equity
Long-term Debt	13,022	[3]	10,700	[3]
Other Liabilities	3,321		3,534
Liabilities	167,323		153,913
Preferred Stock, Value, Outstanding	1,225		725
Common Stock, Value, Outstanding	550		550
Retained Earnings (Accumulated Deficit)	13,295		11,936
Treasury Stock, Value	1,032	[4]	615	[4]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(122)		(289)		309	1,749
Liabilities and Equity	190,328		175,335
Parent Company [Member]
Assets [Abstract]
Cash and Due from Banks	192		238
Cash and Cash Equivalents, at Carrying Value	2,623		3,014		761	1,641
Trading assets	26		92
Available-for-sale Securities	251		316
Due from Affiliates	2,669		1,311
Goodwill	211		99
Other Assets	298		534
Assets	30,083		28,603
Liabilities and Shareholders' Equity
Long-term Debt	4,815		4,111
Other Liabilities	847		819
Liabilities	7,186		7,300
Preferred Stock, Value, Outstanding	1,225		725
Common Stock, Value, Outstanding	550		550
Additional Paid in Capital, Common Stock	9,089		9,115
Retained Earnings (Accumulated Deficit)	13,295		11,936
Treasury Stock, Value	(1,140)		(734)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(122)		(289)
Stockholders' Equity Attributable to Parent	22,897		21,303
Liabilities and Equity	30,083		28,603
Parent Company [Member] | Unaffiliated Entity - Other banking institutions [Member]
Assets [Abstract]
Interest-bearing Deposits in Banks and Other Financial Institutions	21		20
Parent Company [Member] | non-affiliated entity [Member]
Liabilities and Shareholders' Equity
Short-term Debt	1,281		1,554
Long-term Debt	4,815		4,111
Parent Company [Member] | Bank Subsidiaries [Member]
Assets [Abstract]
Interest-bearing Deposits in Banks and Other Financial Institutions	2,410		2,756
Investments in and Advances to Affiliates, Amount of Equity	22,783		21,772
Parent Company [Member] | Nonbank Subsidiaries [Member]
Assets [Abstract]
Investments in and Advances to Affiliates, Amount of Equity	1,222		1,465
Parent Company [Member] | Subsidiaries [Member]
Liabilities and Shareholders' Equity
Short-term Debt	243		656
Long-term Debt	$ 0		$ 160

[1] Includes loans held for sale, at fair value, of consolidated VIEs of $0 million and $261 million at December 31, 2014 and December 31, 2013, respectively.

[2] Includes loans of consolidated VIEs of $288 million and $327 million at December 31, 2014 and December 31, 2013, respectively.

[3] Includes restricted shares of 2,930 thousand and 3,984 thousand at December 31, 2014 and December 31, 2013, respectively.

[4] Includes noncontrolling interest of $108 million and $119 million at December 31, 2014 and December 31, 2013, respectively.