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Financial Derivatives (Derivatives Designated in GAAP Hedge Relationships - Cash Flow Hedges) (Details) (Cash Flow Hedging [Member], Interest Rate Contracts [Member], 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 Derivatives Recognized in OCI (Effective Portion)	$ 103	$ 423	$ 310	$ 703
Interest Income [Member]
Derivatives, Fair Value [Line Items]
Gain Reclassified from Accumulated OCI into Income (Effective Portion)	113	120	345	332
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)
Noninterest Income [Member]
Derivatives, Fair Value [Line Items]
Gain Reclassified from Accumulated OCI into Income (Effective Portion)	$ 13	$ 8	$ 72	$ 41

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

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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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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