Investment in Lease Financing (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accumulated allowance for uncollectible minimum lease payments	$ 1,272	[1]	$ 1,322	[1]	$ 1,582	$ 1,854
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accumulated allowance for uncollectible minimum lease payments	$ 47		$ 45

[1] Includes $152 and $179 of cash and due from banks, $2,537 and $3,378 of portfolio loans and leases, $(28) and $(22) of ALLL, $20 and $25 of other assets, $3 and $5 of other liabilities and $2,493 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2015 and 2014, respectively. For further information, refer to Note 11.