FDIC Loss Share Indemnification Asset - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 30, 2010	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
FDIC loss sharing agreements, estimated carrying amount (discounted value) of the true-up provision		$ 176		$ 169	$ 169
Federal Deposit Insurance Corporation
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
FDIC Loss sharing agreements, reimbursement percentage	80.00%	80.00%	80.00%
FDIC loss sharing agreements, estimated carrying amount (discounted value) of the true-up provision		$ 95		$ 92	$ 89
Federal Deposit Insurance Corporation | Residential Mortgage
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
FDIC Loss sharing agreements, term (in years)		10
Federal Deposit Insurance Corporation | Other Consumer And Commercial Loans
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
FDIC Loss sharing agreements, term (in years)		5
Banco Popular de Puerto Rico
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
FDIC Loss sharing agreements, reimbursement percentage		80.00%
FDIC Loss sharing agreements, days available to make a true-up payment following the "True-Up Measurement Date" (in days)		45
Banco Popular de Puerto Rico | Residential Mortgage
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
FDIC Loss sharing agreements, term (in years)		10
Banco Popular de Puerto Rico | Other Consumer And Commercial Loans
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
BPPR reimbursement to the FDIC, term (in years)		8