Goodwill and Intangible Assets - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Goodwill, Allocation Adjustment			$ 0	$ 0
Servicing Fees, Net	1,000,000	70,000,000	39,000,000	151,000,000
Mortgage Servicing Rights, Fair Value [Member]
Servicing Fees, Net	77,000,000	80,000,000	153,000,000	163,000,000
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Principal Amount Outstanding	140,400,000,000		140,400,000,000		144,900,000,000
Principal Amount Outstanding of Loans Serviced For Third Parties	109,300,000,000		109,300,000,000		113,200,000,000
Loan Principal Amount Outstanding Underlying Mortgage Servicing Rights Sold			632,000,000	1,400,000,000
Wholesale Banking [Member]
Goodwill, Allocation Adjustment			(300,000,000)	2,414,000,000
Wholesale Banking [Member] | Consumer Banking and Private Wealth Management [Member]
Goodwill, Allocation Adjustment	$ 300,000,000