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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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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	121	134	51	44
Gain (Loss) on Related Hedged Items Recognized in Income	(126)	(149)	(76)	(66)
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	(48)	(40)	(29)	(25)
Gain (Loss) on Related Hedged Items Recognized in Income	50	40	26	26
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	(2)	(13)	(2)	(9)
Gain (Loss) on Related Hedged Items Recognized in Income	2	13	2	9
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	44	89	8	30
Gain (Loss) on Related Hedged Items Recognized in Income	(50)	(94)	(24)	(43)
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	127	98	74	48
Gain (Loss) on Related Hedged Items Recognized in Income	$ (128)	$ (108)	$ (80)	$ (58)

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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