Asset Quality (Home Equity and Residential Real Estate Balances) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 200,984	[1],[2]	$ 195,613	[1],[2]	$ 189,775
Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	43,566		44,376
Purchased Impaired Loans - Outstanding Balance	5,120		5,548
Government insured or guaranteed residential real estate mortgages	1,382		1,704
Purchase accounting adjustments - purchased impaired loans	(42)		(116)
Total loans	$ 50,026		$ 51,512

[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[2] Amounts represent items for which we have elected the fair value option.