Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 861	$ 906
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	685	516
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	209	197
Deferred Tax Assets, Tax Credit Carryforwards, Other	0	266
Deferred Tax Assets, Other	173	168
Deferred Tax Assets, Gross	1,928	2,053
Deferred Tax Assets, Valuation Allowance	56	65
Deferred Tax Assets, Net of Valuation Allowance	1,872	1,988
Deferred Tax Liabilities, Other Comprehensive Income	197	995
Deferred Tax Liabilities, Leasing Arrangements	786	728
Deferred Tax Liabilities, Compensation and Benefits	74	100
Deferred Tax Liabilities, Mortgage Servicing Rights	623	613
Deferred Tax Liabilities Loans	72	47
Deferred Tax Liabilities, Goodwill and Intangible Assets	141	121
Deferred Tax Liabilities, Property, Plant and Equipment	196	177
Deferred Tax Liabilities, Other	62	95
Deferred Tax Liabilities, Gross	2,151	2,876
Deferred Tax Liabilities, Net	$ (279)	$ (888)