Assets and Liabilities Measured at Fair Value on a Recurring Basis (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified					3 Months Ended		6 Months Ended								3 Months Ended		6 Months Ended
	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2014 Interest Rate Lock Commitments [Member]	Jun. 30, 2013 Interest Rate Lock Commitments [Member]	Jun. 30, 2014 Interest Rate Lock Commitments [Member]	Jun. 30, 2013 Interest Rate Lock Commitments [Member]	Jun. 30, 2014 Equity Funds [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Equity Funds [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Measurements, Recurring [Member]	Jun. 30, 2014 Federal Reserve Bank Stock [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Federal Reserve Bank Stock [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Jun. 30, 2014 Investment in Federal Home Loan Bank Stock [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Investment in Federal Home Loan Bank Stock [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Jun. 30, 2014 Collateralized Loan Obligations [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2013 Collateralized Loan Obligations [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2014 Collateralized Loan Obligations [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2013 Collateralized Loan Obligations [Member] Fair Value, Inputs, Level 2 [Member]
Fair Value, Option, Credit Risk, Gains (Losses) on Assets															$ 0	$ (1)	$ 0	$ 1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3					60	72	118	207
Investments, Fair Value Disclosure									153	103	402	402	376	336
Derivative Assets	1,333	[1]	1,384	[1]
Derivative Liabilities	$ 364	[2]	$ 525	[2]

[1] At June 30, 2014, $1.3 billion, net of $355 million offsetting cash collateral, is recognized in trading assets and derivatives within the Company's Consolidated Balance Sheets. 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.

[2] At June 30, 2014, $364 million, net of $972 million offsetting cash collateral, is recognized in trading liabilities and derivatives within the Company's Consolidated Balance Sheets. 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.