Guarantees, Pledged Assets and Collateral Textuals (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Guarantees (Textuals) [Abstract]
Maximum exposure to loss		$ 69,683		$ 69,683		$ 70,122
Securities Loaned		0		0		211
Total assets	[1]	1,720,617		1,720,617		1,687,155
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value		7,300		7,300		6,900
Mortgages held for sale		14,100		14,100		8,700
Carrying value of delinquent loans eligible for repurchase		1,200		1,200		1,700
Net amounts in consolidated balance sheet		60,234		60,234		51,671
Collateral received, fair value		84,800		84,800		64,500
Collateral received with the right to sell or repledge		84,800		84,800		64,500
Collateral sold or repledged		49,500		49,500		40,800
Collateral pledged, fair value		86,600		86,600		56,500
Fed Funds Sold, Securities Purchased under Resale Agreements and Other Short-Term Investments [Member]
Guarantees (Textuals) [Abstract]
Net amounts in consolidated balance sheet		41,200		41,200		36,800
Loans [Member]
Guarantees (Textuals) [Abstract]
Net amounts in consolidated balance sheet		19,000		19,000		14,900
Direct pay letters of credit (DPLCs) [Member]
Guarantees (Textuals) [Abstract]
Maximum exposure to loss		13,100		13,100		15,000
Third party clearing indemnifications [Member]
Guarantees (Textuals) [Abstract]
Maximum exposure to loss		5,700		5,700		5,700
Third-party clearing customer obligations		1,100		1,100		950
Collateral provided to third-party clearing agents		4,900		4,900		5,600
Loans and MHFS sold with recourse [Member]
Guarantees (Textuals) [Abstract]
Loans repurchased		2	$ 4	3	$ 5
VIEs that we consolidate [Member]
Guarantees (Textuals) [Abstract]
Total assets		6,218		6,218		5,817
Secured Borrowing transactions excluded [Member]
Guarantees (Textuals) [Abstract]
Total assets		7,655		7,655		10,132
Trading assets and other [Member]
Guarantees (Textuals) [Abstract]
Securities owned and pledged as collateral available to be repledged, Fair Value		71,500		71,500		49,400
Investment securities [Member]
Guarantees (Textuals) [Abstract]
Securities owned and pledged as collateral available to be repledged, Fair Value		7,800		7,800		164
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, carrying value		6,800		6,800		6,600
Securities owned and pledged as collateral related to repurchase agreements not available to be repledged, Fair Value		$ 6,800		$ 6,800		$ 6,800

[1] Our consolidated assets at June 30, 2015, and December 31, 2014, include the following assets of certain variable interest entities (VIEs) that can only be used to settle the liabilities of those VIEs: Cash and due from banks, $122 million and $117 million; Trading assets, $1 million and $0 million; Investment securities, $690 million and $875 million; Net loans, $5.1 billion and $4.5 billion; Other assets, $302 million and $316 million, and Total assets, $6.2 billion and $5.8 billion, respectively.