Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 1,943	$ 1,785	$ 1,361
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Gain (Loss) on Disposition of Business	0	(105)	0
Depreciation, Amortization and Accretion, Net	786	693	708
Payments to Acquire Mortgage Servicing Rights (MSR)	(238)	(178)	(352)
Provisions For Credit Losses And Foreclosed Properties	176	364	605
Provision for Mortgage Loan Repurchase Losses	(12)	12	114
Deferred Income Tax Expense (Benefit)	21	99	495
Stock Option Compensation And Amortization Of Restricted Stock Compensation	89	67	53
Excess Tax Benefit from Share-based Compensation, Operating Activities	(20)	(6)	(4)
Gain (Loss) on Sale of Securities, Net	(21)	15	(2)
Gain (Loss) on Sale of Loans and Leases	323	343	267
Net decrease/(increase) in loans held for sale	1,625	(1,567)	2,104
Increase (Decrease) in Trading Securities	67	(1,529)	770
Net (increase)/decrease in other assets	(407)	(45)	(529)
Increase (Decrease) in Other Operating Liabilities	(190)	(444)	(846)
Net Cash Provided by (Used in) Operating Activities	3,496	(1,182)	4,210
Cash Flows from Investing Activities:
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities	5,680	4,707	5,522
Proceeds from sales of securities available for sale	2,708	2,470	2,063
Purchases of securities available for sale	(9,882)	(11,039)	(9,215)
Proceeds from Sale of Other Investments	0	59	8
Proceeds from (payments for) Originations and Purchases of Loans Held-for-investment	(5,897)	(9,843)	(8,409)
Proceeds from sales of loans	2,127	4,090	819
Payments for (Proceeds from) Mortgage Servicing Rights	117	130	0
Capital expenditures	(186)	(147)	(200)
Payments related to acquisitions, including contingent consideration	(30)	(11)	(3)
Proceeds from Divestiture of Businesses	0	193	0
Proceeds from Sale of Other Real Estate	281	378	472
Net Cash Provided by (Used in) Investing Activities	(5,316)	(9,273)	(8,943)
Cash Flows from Financing Activities:
Net (decrease)/increase in total deposits	9,263	10,808	(2,557)
Net increase/(decrease) in funds purchased, securities sold under agreements to repurchase, and other short-term borrowings	(4,559)	447	3,245
Proceeds from Issuance of Long-term Debt	1,351	2,574	1,564
Repayment of long-term debt	(5,684)	(53)	(155)
Payments for Repurchase of Common Stock	(679)	(458)	(150)
Common and preferred dividends paid	(539)	(409)	(225)
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	37	16	17
Proceeds from Issuance of Preferred Stock and Preference Stock	0	496	0
Net Cash Provided by (Used in) Financing Activities	(810)	13,421	1,739
Cash and Cash Equivalents, Period Increase (Decrease)	(2,630)	2,966	(2,994)
Cash and cash equivalents	8,229	5,263
Cash and cash equivalents	5,599	8,229	5,263
Supplemental Disclosures:
Interest Paid	523	534	533
Income Taxes Paid	497	380	168
Proceeds from Income Tax Refunds	1	219	99
Transfer of Loans Held-for-sale to Portfolio Loans	741	44	43
Transfer of Portfolio Loans and Leases to Held-for-sale	1,790	3,280	280
Transfer to Other Real Estate	67	148	255
Amortization Of Deferred Gain On Sale Lease Back Of Premises	54	53	58
non-cash impact of deconsolidated assets	0	282	0
Non-cash impact of debt acquired by purchaser in leverage lease sale	$ 190	$ 177	$ 194