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Financial Derivatives (Derivatives Designated in GAAP Hedge Relationships - Fair Value Hedges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivatives, Fair Value [Line Items]
Gain (Loss) on Related Hedged Items Recognized in Income			$ 110
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	33	270	84	314
Gain (Loss) on Related Hedged Items Recognized in Income	(50)	(263)	(126)	(329)
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member] \| US Treasury and Government Agencies Securities [Member] \| Investment Securities Interest Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(11)	(129)	(40)	(154)
Gain (Loss) on Related Hedged Items Recognized in Income	11	135	37	161
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member] \| Other Debt Securities [Member] \| Investment Securities Interest Income [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(1)	(15)	(3)	(24)
Gain (Loss) on Related Hedged Items Recognized in Income	1	15	3	24
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member] \| Subordinated Debts [Member] \| Borrowed Funds Interest Expense [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	6	193	14	223
Gain (Loss) on Related Hedged Items Recognized in Income	(19)	(193)	(43)	(236)
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member] \| Bank Notes And Senior Debt [Member] \| Borrowed Funds Interest Expense [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	39	221	113	269
Gain (Loss) on Related Hedged Items Recognized in Income	$ (43)	$ (220)	$ (123)	$ (278)

The amount of gain 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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- Definition

The amount of loss 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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