Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would favorably impact the effective tax rate	$ 64,000,000
Estimated change in balance of unrecognized tax benefits, within the next twelve months	54,000,000
Unrecognized tax benefits	77,000,000	110,000,000	176,000,000	209,000,000
Undistributed Earnings Of Foreign Subsidiaries	77,000,000
Allocations For Bad Debt Deductions Of Former Thrift Subsidiaries Included In Retained Earnings	117,000,000	117,000,000
Income tax expense benefit - gross interest and penalties	5,000,000
Income Tax Examination Penalties And Interest Accrued	41,000,000	45,000,000
Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability	24,000,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	2,594,000,000	2,958,000,000
Tax Credit Carryforward Valuation Allowance	65,000,000
Operating Loss Carryforwards Earliest Expiration Date	2015
Operating Loss Carryforwards Latest Expiration Date	2031
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 997,000,000	$ 1,116,000,000
Operating Loss Carryforwards Expiration Date	Dec. 31, 2032
Tax Credit Carryforward Expiration Date	Dec. 31, 2032
Income Tax Examination Earliest Year Substantially Complete	2007
Income Tax Examination Latest Year Substantially Complete	2010
Income Tax Examination Earliest Year Under Examination	2011
Income Tax Examination Latest Year Under Examination	2013
Internal Revenue Service (IRS) [Member] | National City Acquisition [Member]
Operating Loss Carryforwards [Line Items]
Certain Tax Examination Adjustments Under Review Earliest Year	2004
Certain Tax Examination Adjustments Under Review Latest Year	2008