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Change in Fair Value of Financial Instruments for which the FVO has been Elected (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income recognized upon the sale of loans	$ 3	$ 22
Loans Held-for-Sale
Income recognized upon the sale of loans	882	271
Loans Held-for-Sale \| Mortgage Production Income [Member]
Income recognized upon the sale of loans	304	217	274
Mortgage Servicing Rights [Member] \| Mortgage Production Income [Member]
Income recognized upon the sale of loans	31	7	15
Nondesignated
Derivative Instruments, Gain (Loss) Recognized in Income, Net	1,134	779	767
Mortgage Production Income [Member] \| Other Contract \| Loans \| Nondesignated
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 930	$ 355	$ 392

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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