Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 449	$ 431
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation, Amortization and Accretion, Net	171	201
Payments to Acquire Mortgage Servicing Rights (MSR)	(46)	(46)
Provisions For Credit Losses And Foreclosed Properties	103	58
Stock Option Compensation And Amortization Of Restricted Stock Compensation	25	19
Excess Tax Benefit from Share-based Compensation, Operating Activities	(8)	(16)
Gain (Loss) on Sale of Loans and Leases	84	102
Net decrease/(increase) in loans held for sale	(4)	(108)
Increase (Decrease) in Trading Securities	(689)	(322)
Net (increase)/decrease in other assets	138	(340)
Increase (Decrease) in Other Operating Liabilities	(306)	15
Net Cash Provided by (Used in) Operating Activities	(251)	(210)
Cash Flows from Investing Activities:
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	1,057	1,421
Proceeds from sales of securities available for sale	0	10
Purchases of securities available for sale	(1,008)	(1,344)
Proceeds from (payments for) Originations and Purchases of Loans Held-for-investment	(3,438)	212
Proceeds from sales of loans	18	411
Payments for (Proceeds from) Mortgage Servicing Rights	75	64
Capital expenditures	(24)	(33)
Payments related to acquisitions, including contingent consideration	(23)	(10)
Proceeds from Sale of Other Real Estate	34	86
Net Cash Provided by (Used in) Investing Activities	(3,459)	689
Cash Flows from Financing Activities:
Net (decrease)/increase in total deposits	2,331	3,856
Net increase/(decrease) in funds purchased, securities sold under agreements to repurchase, and other short-term borrowings	317	(4,604)
Proceeds from Issuance of Long-term Debt	1,105	0
Repayment of long-term debt	(1,019)	(14)
Payments for Repurchase of Common Stock	(151)	(115)
Payments for Repurchase of Warrants	(24)	0
Common and preferred dividends paid	(130)	(115)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	9	22
Net Cash Provided by (Used in) Financing Activities	2,438	(970)
Cash and Cash Equivalents, Period Increase (Decrease)	(1,272)	(491)
Cash and cash equivalents	5,599	8,229
Cash and cash equivalents	4,327	7,738
Supplemental Disclosures:
Transfer of Loans Held-for-sale to Portfolio Loans	5	11
Transfer of Portfolio Loans and Leases to Held-for-sale	55	512
Transfer to Other Real Estate	16	14
Non-cash impact of debt acquired by purchaser in leverage lease sale	$ 26	$ 21