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Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Repurchase Agreement Counterparty [Line Items]
Balance, repurchase agreement	$ 20,152,860	$ 16,162,375
Weighted Average Contractual Rate	0.41%	0.37%
Maturity up to 30 days
Repurchase Agreement Counterparty [Line Items]
Balance, repurchase agreement	14,948,041	16,162,375
Weighted Average Contractual Rate	0.40%	0.37%
Maturity 30 to 90 Days
Repurchase Agreement Counterparty [Line Items]
Balance, repurchase agreement	$ 5,204,819
Weighted Average Contractual Rate	0.41%

The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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