Impacts of Derivative Financial Instruments on the Consolidated Statements of Income/(Loss) and the Consolidated Statements of Shareholders' Equity (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
pretax gains recognized on Coke cash flow hedging	$ 60,000,000		$ 60,000,000
Interest Income (Expense), Net [Member]
Reclassified in pre-tax gains from AOCI into net interest income	34,000,000	56,000,000	140,000,000	146,000,000
Nondesignated
Derivative Instruments, Gain (Loss) Recognized in Income, Net	294,000,000	369,000,000	981,000,000	598,000,000
Loans | Credit Risk Contract [Member] | Nondesignated | Trading Account Profits And Commissions [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net		$ 0	$ 3,000,000	$ (1,000,000)