Loan Sale and Servicing Activities and Variable Interest Entities (Consolidated VIEs - Carrying Value) (Details) - USD ($) $ in Millions		Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015	Dec. 31, 2014
Cash and due from banks		$ 3,861		$ 4,065	[1]	$ 4,151	$ 4,360
Interest-earning deposits with banks		29,478		30,546	[1]
Loans (b)		207,485	[2]	206,696	[2]	204,722
Allowance for loan and lease losses		(2,711)		(2,727)		$ (3,306)	$ (3,331)
Equity investments	[1]	10,391		10,587
Other assets	[1],[2]	24,585		23,092
Total assets		360,985		358,493
Other borrowed funds	[3],[4]	2,324		2,793
Accrued expenses	[4]	4,850		4,975
Other liabilities	[4]	4,988		3,743
Total liabilities		314,657		312,513
Noncontrolling interests		1,198		1,270
Variable Interest Entity, Primary Beneficiary [Member]
Cash and due from banks	[1]			11
Interest-earning deposits with banks	[1]			4
Loans (b)				1,341
Allowance for loan and lease losses				(48)
Equity investments	[1]	326		183
Other assets	[1]	41		402
Total assets		367		1,893
Other borrowed funds	[4]			148
Accrued expenses	[4]			44
Other liabilities	[4]			202
Total liabilities		9		394
Noncontrolling interests		$ 156		$ 99

[1] Our consolidated assets at March 31, 2016 included the following assets of certain variable interest entities (VIEs): Equity investments of $326 million and Other assets of $41 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 March 31, 2016 included the following for which we have elected the fair value option: Federal funds sold and resale agreements of $138 million, Loans held for sale of $1.4 billion, Loans of $.9 billion, and Other assets of $375 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 March 31, 2016 and December 31, 2015 included Other borrowed funds of $63 million and $93 million, respectively, for which we have elected the fair value option.

[4] Our consolidated liabilities at March 31, 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.