Activity in the Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Components:
Balance at beginning of period	$ 2,219		$ 2,505		$ 3,032
Provision for loan losses	548		1,398		1,523
Provision(Benefit) for unfunded commitments	(5)		3		10
Loan charge-offs	(869)		(1,907)		(2,241)
Loan recoveries	191		226		201
Balance at end of period	2,094		2,219		2,505
Loans and Leases Receivable, Allowance	2,044		2,174		2,457
Unfunded commitments reserve	50	[1]	45	[1]	48	[1]
Allowance for credit losses	$ 2,094		$ 2,219		$ 2,505

[1] The unfunded commitments reserve is recorded in other liabilities in the Consolidated Balance Sheets.