Derivatives and Hedging Activities (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Derivatives and Hedging Activities (Textuals)
Derivative assets after effects of bilateral collateral and master netting agreements	$ 225,000,000
Derivative liabilities after effects of bilateral collateral and master netting agreements	115,000,000
Derivative assets not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	675,000,000
Derivative liabilities not designated as hedging instruments after effects of bilateral collateral and master netting agreements, and a reserve for potential future losses	876,000,000
Reclassification of net losses on derivative instruments from AOCI	7,000,000
Maximum length of time hedged in cash flow hedge (years)	12 months
Reclassification of net gains related to terminated cash flow hedges from AOCI to income	13,000,000
Maximum length of time over which forecasted transactions are hedged, years	17
Cash collateral netted against derivative assets	354,000,000	331,000,000	469,000,000
Cash collateral netted against derivative liabilities	19,000,000	2,000,000	2,000,000
Gross exposure on derivatives, after taking into account the effects of bilateral collateral and master netting agreements	804,000,000
Net exposure on derivatives, after taking into account, the effects of bilateral collateral and master netting agreements	211,000,000
Net exposure on derivatives to broker-dealers and banks, after the application of master netting agreements and collateral	21,000,000
Default Reserve Associated With Uncollateralized Contracts	32,000,000	48,000,000
Gross exposure on derivatives, after taking into account the effects of master netting agreements	779,000,000
Net exposure on derivatives with clients, after the application of master netting agreements, collateral and the related reserve	689,000,000
Net liability position total	867,000,000
Derivative assets included in net liability position	531,000,000
Derivative liabilities included in net liability position	1,400,000,000
Cash and securities collateral posted	861,000,000
Payments to terminate contracts	$ 17,000,000