Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		$ 60
Interest Income (Expense), Net [Member]
Reclassified in pre-tax gains from AOCI into net interest income	90	171	202
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	190	1,134	779
Loans | Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Trading Account Profits And Commissions [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net		$ (3)	$ (1)