Derivative Financial Instruments (Impact Of Derivatives On Consolidated Statement Of Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Derivative [Line Items]
Losses on written options recorded in other expense			$ 5		$ 9
Derivatives Designated As Fair Value Hedges [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(251)		14		148
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	244		(9)		(156)
Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Deposits [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income					22
Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Long-Term Debt [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	(70)		(49)		30
Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Investment Securities Available For Sale [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	153		40		(208)
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	669	[1]	631	[1]	674	[1]
Interest-Rate Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Contract One [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income					(22)
Interest-Rate Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Contract Two [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	75		57		(30)
Interest-Rate Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Contract Three [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(165)		(43)		200
Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Processing Fees And Other Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income			10	[1]	5	[1]
Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Trading Services Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	21	[1]	7	[1]
Foreign Exchange Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	(161)
Foreign Exchange Contracts [Member] | Derivatives Designated As Fair Value Hedges [Member] | Processing Fees And Other Revenue [Member] | Investment Securities [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Hedged Item Recognized in Consolidated Statement of Income	161
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Processing Fees And Other Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	7	[1]	(4)	[1]	(5)	[1]
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Trading Services Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income	641	[1]	618	[1]	677	[1]
Other Derivative Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Trading Services Revenue [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivative Recognized in Consolidated Statement of Income					$ (3)	[1]

[1] Losses on derivatives related to book-value protection provided to stable value funds are recorded in other expenses, and totaled approximately $5 million, and $9 million, respectively, for the years ended December 31, 2010 and 2009. There were no losses related to stable value funds for the year ended December 31, 2011.