INVESTMENTS - Net Effect on Shareholders' Equity of Unrealized Gains and Losses from Investment Securities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Unrealized Gains (Losses) on Available-for-sale Securities	$ 7,970	$ 7,426
Deferred income taxes	(2,944)	(2,754)
Shareholders' equity, unrealized gains (losses) on investment securities	$ 5,026	$ 4,672