Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 376	$ 412
Deferred Tax Assets, Other Comprehensive Loss	438	302
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	111	227
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	145	180
Deferred Tax Assets, Other	21	17
Deferred Tax Assets, Gross	1,091	1,138
Deferred Tax Assets, Valuation Allowance	(85)	(143)
Deferred Tax Assets, Net	1,006	995
Deferred Tax Liabilities, Leasing Arrangements	475	459
Deferred Tax Liabilities, Servicing Rights	270	290
Deferred Tax Liabilities, Employee Compensation and Benefits	140	210
Deferred Tax Liabilities, Tax Deferred Income	29	193
Deferred Tax Liabilities, Goodwill and Intangible Assets	156	155
Deferred Tax Liabilities, Property, Plant and Equipment	149	111
Deferred Tax Liabilities Loans	96	104
Deferred Tax Liabilities, Other	38	41
Deferred Tax Liabilities, Gross	1,353	1,563
Deferred Tax Liabilities, Net	$ (347)	$ (568)