Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes (Textual) [Abstract]
Income tax (benefit) expense on securities transactions	$ 0.4	$ 5.0	$ 42.0
Equity and gross receipts based taxes assessed in lieu of income tax recorded in noninterest expense	21	19	24
Carryforward of federal net operating loss	442	390
State net operating loss carryforward	363
Undistributed earnings from Non-US subsidiaries		86
Income tax expense related to repatriation of undistributed earnings from Non-US subsidiaries		32
After tax interest refunds from IRS	23
Interest assessments amount recovered	16
Unrecognized tax benefits	8	23
Net interest credit (expenses)	52	12	99
Net interest credit (expenses) attributable to leveraged lease transactions	25	6	62
Recovery of penalties related to unrecognized tax benefits in income tax expense	14	5
Accrued interest payable	1	3
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Accrued state tax penalties	$ 1	$ 20