Loan Sale and Servicing Activities and Variable Interest Entities (Consolidated VIEs - Carrying Value) (Details) - USD ($)		Sep. 30, 2016		Dec. 31, 2015		Sep. 30, 2015	Dec. 31, 2014
Cash and due from banks		$ 4,531,000,000		$ 4,065,000,000	[1]	$ 3,835,000,000	$ 4,360,000,000
Interest-earning deposits with banks		27,058,000,000		30,546,000,000	[1]
Loans (b)		210,446,000,000	[2]	206,696,000,000	[2]	204,983,000,000
Allowance for loan and lease losses		(2,619,000,000)		(2,727,000,000)		$ (3,237,000,000)	$ (3,331,000,000)
Equity investments	[1]	10,605,000,000		10,587,000,000
Other assets	[1],[2]	24,730,000,000		23,092,000,000
Total assets		369,348,000,000		358,493,000,000
Other borrowed funds	[3],[4]	2,117,000,000		2,793,000,000
Accrued expenses	[4]	5,226,000,000		4,975,000,000
Other liabilities	[4]	5,531,000,000		3,743,000,000
Total liabilities		322,503,000,000		312,513,000,000
Noncontrolling interests		1,138,000,000		1,270,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Cash and due from banks	[1]			11,000,000
Interest-earning deposits with banks	[1]			4,000,000
Loans (b)				1,341,000,000
Allowance for loan and lease losses				(48,000,000)
Equity investments	[1]	205,000,000		183,000,000
Other assets	[1]	21,000,000		402,000,000
Total assets		226,000,000		1,893,000,000
Other borrowed funds	[4]			148,000,000
Accrued expenses	[4]			44,000,000
Other liabilities	[4]			202,000,000
Total liabilities		9,000,000		394,000,000
Noncontrolling interests		$ 121,000,000		$ 99,000,000

[1] Our consolidated assets at September 30, 2016 included the following assets of certain variable interest entities (VIEs): Equity investments of $205 million and Other assets of $21 million. Our consolidated assets at December 31, 2015 included the following assets of certain VIEs: Cash and due from banks of $11 million, Interest-earning deposits with banks of $4 million, Net loans of $1.3 billion, Equity investments of $183 million, and Other assets of $402 million.

[2] Our consolidated assets at September 30, 2016 included the following for which we have elected the fair value option: Federal funds sold and resale agreements of $136 million, Loans held for sale of $2.0 billion, Loans of $.9 billion, and Other assets of $384 million. Our consolidated assets at December 31, 2015 included the following for which we have elected the fair value option: Federal funds sold and resale agreements of $137 million, Loans held for sale of $1.5 billion, Loans of $.9 billion, and Other assets of $521 million.

[3] Our consolidated liabilities at September 30, 2016 and December 31, 2015 included Other borrowed funds of $78 million and $93 million, respectively, for which we have elected the fair value option.

[4] Our consolidated liabilities at September 30, 2016 included liabilities of $9 million for certain VIEs. Our consolidated liabilities at December 31, 2015 included the following liabilities of certain VIEs: Other borrowed funds of $148 million, Accrued expenses of $44 million, and Other liabilities of $202 million.