Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	[1]	Dec. 31, 2016	[2]
Deferred Tax Assets and Liabilities [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	$ 412		$ 639
Deferred Tax Assets, Other Comprehensive Loss	302		472
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	227		170
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	180		343
Deferred Tax Assets, Other	17		19
Deferred Tax Assets, Gross	1,138		1,643
Deferred Tax Assets, Valuation Allowance	(143)		(80)
Deferred Tax Assets, Net	995		1,563
Deferred Tax Liabilities, Leasing Arrangements	459		659
Deferred Tax Liabilities, Servicing Rights	290		370
Deferred Tax Liabilities, Employee Compensation and Benefits	210		179
Deferred Tax Liabilities, Tax Deferred Income	193		22
Deferred Tax Liabilities, Goodwill and Intangible Assets	155		233
Deferred Tax Liabilities, Property, Plant and Equipment	111		113
Deferred Tax Liabilities Loans	104		176
Deferred Tax Liabilities, Other	41		43
Deferred Tax Liabilities, Gross	1,563		1,795
Deferred Tax Liabilities, Net	$ (568)		$ (232)

[1] The Company's DTAs and DTLs for December 31, 2017 were calculated using the enacted federal income rate of 21%.

[2] The Company's DTAs and DTLs for December 31, 2016 were calculated using the enacted federal income rate of 35%.