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INVESTMENTS - Net Effect on Shareholders' Equity of Unrealized Gains and Losses from Investment Securities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Investments [Abstract] |  |
Unrealized gains (losses) on securities available for sale | $ 3,003 | $ 3,932
Unamortized unrealized gains on securities transferred to held to maturity | 17 | 20
Deferred income taxes | (1,039) | (1,382)
Shareholders' equity, unrealized gains (losses) on investment securities | $ 1,981 | $ 2,570

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