Summary of Loans Modified in a TDR (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 number		Dec. 31, 2012 number		Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	11,291	[1],[2]	16,064	[1],[2]
Recorded Investment in Loans Modified in a TDR During the Period	$ 1,081	[1]	$ 793	[1]
Allowance for loan and lease losses	1,582	[3]	1,854	[3]	2,255	3,004
Charge offs recognized upon modification	2
Troubled Debt Restructuring On Nonaccrual Status [Member] | Variable Interest Entity, Primary Beneficiary
Financing Receivable, Modifications [Line Items]
Recorded Investment in Loans Modified in a TDR During the Period	$ 28

[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality.

[2] Represents number of loans post-modification.

[3] At December 31, 2013 and 2012, includes $49 and $0 of cash and due from banks, $48 and $50 of commercial mortgage loans, $ 1,010 and $0 of automobile loans, $(15) and $(5) of ALLL, $13 and $3 of other assets, $1 and $0 of other liabilities, $ 1,048 and $0 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 10.