Stockholders' Equity - Additional Information (Detail) (USD $) In Millions	3 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Stockholders Equity Note [Line Items]
Description of the requirement to transfer net income to statutory reserve account	minimum of 10% of BPPR’s net income
Statutory reserve amount	$ 402	$ 402	$ 402