Loan Sale and Servicing Activities and Variable Interest Entities (Consolidated VIEs - Carrying Value) (Details) - USD ($)		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Cash and due from banks		$ 4,065,000,000	[1]	$ 4,360,000,000	[1]	$ 4,043,000,000	$ 5,220,000,000
Interest-earning deposits with banks	[1]	30,546,000,000		31,779,000,000
Loans (b)		206,696,000,000	[2]	204,817,000,000	[2]	195,613,000,000
Allowance for loan and lease losses		(2,727,000,000)		(3,331,000,000)		$ (3,609,000,000)	$ (4,036,000,000)
Equity investments	[1]	10,587,000,000		10,728,000,000
Other assets	[1],[2]	23,092,000,000		23,482,000,000
Total assets		358,493,000,000		345,072,000,000
Other borrowed funds	[3],[4]	2,779,000,000		3,357,000,000
Accrued expenses	[4]	4,975,000,000		5,187,000,000
Other liabilities	[4]	3,743,000,000		4,550,000,000
Total liabilities		312,513,000,000		298,998,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Cash and due from banks	[1]	11,000,000		6,000,000
Interest-earning deposits with banks	[1]	4,000,000		6,000,000
Loans (b)		1,341,000,000		1,606,000,000
Allowance for loan and lease losses		(48,000,000)		(50,000,000)
Equity investments	[1]	183,000,000		492,000,000
Other assets	[1]	402,000,000		483,000,000
Total assets		1,893,000,000		2,543,000,000
Other borrowed funds	[4]	148,000,000		347,000,000
Accrued expenses	[4]	44,000,000		70,000,000
Other liabilities	[4]	202,000,000		206,000,000
Total liabilities		394,000,000		623,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Credit Card and Other Securitization Trusts [Member]
Loans (b)		1,335,000,000		1,606,000,000
Allowance for loan and lease losses		(48,000,000)		(50,000,000)
Other assets		22,000,000		31,000,000
Total assets		1,309,000,000		1,587,000,000
Other borrowed funds				166,000,000
Total liabilities				166,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Tax Credit Investments
Cash and due from banks		11,000,000		6,000,000
Interest-earning deposits with banks		4,000,000		6,000,000
Loans (b)		6,000,000
Equity investments		183,000,000		492,000,000
Other assets		380,000,000		452,000,000
Total assets		584,000,000		956,000,000
Other borrowed funds		148,000,000		181,000,000
Accrued expenses		44,000,000		70,000,000
Other liabilities		202,000,000		206,000,000
Total liabilities		$ 394,000,000		$ 457,000,000

[1] Our consolidated assets at December 31, 2015 included the following assets of certain variable interest entities (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. Our consolidated assets at December 31, 2014 included the following assets of certain VIEs: Cash and due from banks of $6 million, Interest-earning deposits with banks of $6 million, Net loans of $1.6 billion, Equity investments of $492 million, and Other assets of $483 million.

[2] 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. Our consolidated assets at December 31, 2014 included the following for which we have elected the fair value option: Federal funds sold and resale agreements of $155 million, Loans held for sale of $2.2 billion, Loans of $1.0 billion, and Other assets of $412 million.

[3] Our consolidated liabilities at December 31, 2015 and December 31, 2014 included Other borrowed funds of $93 million and $273 million, respectively, for which we have elected the fair value option.

[4] 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. Our consolidated liabilities at December 31, 2014 included the following liabilities of certain VIEs: Other borrowed funds of $347 million, Accrued expenses of $70 million, and Other liabilities of $206 million.