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Investment Securities - Additional Information (Detail) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]    
Weighted-average maturity of available-for-sale investment securities 4 years 10 months 24 days 6 years
Weighted-average yields of available-for-sale investment securities 2.43% 2.64%
Weighted average maturity of held-to-maturity investment securities 4 years 3 months 18 days 4 years 6 months
Weighted-average yields of held-to-maturity investment securities 1.98% 2.00%
Fair value of securities pledged $ 14,100,000,000 $ 17,300,000,000
Fair value of securities pledged as collateral where counterparty has right to repledge or resell $ 677,000,000 $ 2,100,000,000