Trading Assets and Liabilities and Derivatives(Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	$ 5,040		$ 6,227
Trading liabilities	1,181		1,176
Derivative Assets	1,384	[1]	2,083	[1]
Derivative Liabilities	525	[2]	412	[2]
US Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	219		111
Trading liabilities	472		582
US Government Agencies Debt Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	426		462
US States and Political Subdivisions Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	65		34
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	323		432
Collateralized Debt Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	57		55
Asset-backed Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	6		36
Corporate And Other Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	534		567
Trading liabilities	179		173
Commercial Paper [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	29		28
Equity Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	109		100
Trading liabilities	5		9
Derivative Financial Instruments, Assets
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	1,384	[3]	2,083	[3]
Loans
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading assets	1,888	[4]	2,319	[4]
Derivative Financial Instruments, Liabilities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Trading liabilities	525	[3]	412	[3]
Other Credit Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Assets	37		178
Derivative Liabilities	$ 49		$ 15

[1] At December 31, 2013, $1.4 billion, net of $457 million offsetting cash collateral, is recognized in trading assets and derivatives within the Company's Consolidated Balance Sheets. At December 31, 2012, $2.1 billion, net of $730 million offsetting cash collateral, is recognized in trading assets and derivatives within the Company's Consolidated Balance Sheets.

[2] At December 31, 2013, $525 million, net of $864 million offsetting cash collateral, is recognized in trading liabilities and derivatives within the Company's Consolidated Balance Sheets. At December 31, 2012, $412 million, net of $1.3 billion offsetting cash collateral, is recognized in trading liabilities and derivatives within the Company's Consolidated Balance Sheets.

[3] 2 Amounts include the impact of offsetting cash collateral received from and paid to the same derivative counterparties and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists.

[4] 3 Includes loans related to TRS.