Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (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, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	$ 1,582	[1]	$ 1,854	[1]	$ 2,255	$ 3,004
Notes Receivable Net	88,522	[2],[3]	85,706	[4],[5]
Number of Contracts	11,291	[6],[7]	16,064	[6],[7]
Recorded Investment	3,353		2,823
Leveraged Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	9		11
Portfolio loans and leases at fair value	881		862
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Portfolio loans and leases at fair value	92		76
Consolidated Variable Interest Entity
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	11
Number of Contracts	5
Recorded Investment	$ 28

[1] 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.

[2] Excludes $92 of residential mortgage loans measured at fair value, and includes $881 of leveraged leases, net of unearned income.

[3] Excludes $92 of loans measured at fair value.

[4] Excludes $76 of residential mortgage loans measured at fair value, and includes $862 of leveraged leases, net of unearned income.

[5] Excludes $76 of loans measured at fair value.

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

[7] Represents number of loans post-modification.