Citizens Financial (CFG) 10-Q 9 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Entity Central Index Key	759,944
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	CFG
Entity Registrant Name	CITIZENS FINANCIAL GROUP INC/RI
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		484,726,571

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
ASSETS:
Cash and due from banks		$ 1,172	$ 987
Interest-bearing cash and due from banks		2,687	2,045
Interest-bearing deposits in banks		142	192
Debt securities available for sale, at fair value (including $85 and $91 pledged to creditors, respectively)	[1]	19,958	20,157
Debt securities held to maturity (fair value of $4,439 and $4,668, respectively)		4,555	4,685
Equity securities, at fair value		172	169
Equity securities, at cost		748	722
Loans held for sale, at fair value		478	497
Other loans held for sale		322	221
Loans and leases	[2],[3]	111,425	110,617
Less: Allowance for loan and lease losses		(1,246)	(1,236)
Net loans and leases		110,179	109,381
Derivative assets		274	617
Premises and equipment, net		687	685
Bank-owned life insurance		1,669	1,656
Goodwill		6,887	6,887
Due from broker		84	6
Other assets		3,439	3,429
TOTAL ASSETS		153,453	152,336
Deposits:
Noninterest-bearing		28,437	29,279
Interest-bearing		87,293	85,810
Total deposits		115,730	115,089
Federal funds purchased and securities sold under agreements to repurchase		315	815
Other short-term borrowed funds		1,494	1,856
Derivative liabilities		331	310
Deferred taxes, net		475	571
Long-term borrowed funds		13,486	11,765
Due to broker		84	0
Other liabilities		1,479	1,660
TOTAL LIABILITIES		133,394	132,066
Contingencies (refer to Note 11)
Preferred stock, $25.00 par value, authorized 100,000,000 shares:
Series A, non-cumulative perpetual, $25 par value (liquidation preference $1,000), 250,000 shares authorized and issued net of issuance costs and related premium at March 31, 2018 and December 31, 2017		247	247
Common stock:
$0.01 par value, 1,000,000,000 shares authorized, 566,476,539 shares issued and 487,551,444 shares outstanding at March 31, 2018 and 1,000,000,000 shares authorized, 565,850,984 shares issued and 490,812,912 shares outstanding at December 31, 2017		6	6
Additional paid-in capital		18,797	18,781
Retained earnings		4,437	4,164
Treasury stock, at cost, 78,925,095 and 75,038,072 shares at March 31, 2018 and December 31, 2017, respectively		(2,283)	(2,108)
Accumulated other comprehensive loss		(1,145)	(820)
TOTAL STOCKHOLDERS’ EQUITY		20,059	20,270
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		$ 153,453	$ 152,336
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.
[2]	Excluded from the table above are loans held for sale totaling $800 million and $718 million as of March 31, 2018 and December 31, 2017, respectively.
[3]	Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $20.2 billion and $20.3 billion at March 31, 2018 and December 31, 2017, respectively.

CONSOLIDATED BALANCE SHEETS (U3

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
ASSETS:
Securities held-to-maturity, fair value	$ 4,439	$ 4,668
STOCKHOLDERS’ EQUITY:
Preferred stock, par value (in dollars per share)	$ 25	$ 25
Preferred stock, authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, issued (in shares)	566,476,539	565,850,984
Common stock, outstanding (in shares)	487,551,444	490,812,912
Treasury stock (in shares)	78,925,095	75,038,072
Series A Preferred Stock
STOCKHOLDERS’ EQUITY:
Preferred stock, par value (in dollars per share)	$ 25	$ 25
Preferred stock, liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, authorized (in shares)	250,000	250,000
Preferred stock, issued (in shares)	250,000	250,000
Available-for-sale Securities
ASSETS:
Securities, pledged to creditors	$ 85	$ 91
Held-to-maturity Securities
ASSETS:
Securities held-to-maturity, fair value	$ 4,439	$ 4,668

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME:
Interest and fees on loans and leases	$ 1,146	$ 992
Interest and fees on loans held for sale, at fair value	4	4
Interest and fees on other loans held for sale	4	1
Investment securities	168	160
Interest-bearing deposits in banks	6	3
Total interest income	1,328	1,160
INTEREST EXPENSE:
Deposits	145	86
Federal funds purchased and securities sold under agreements to repurchase	1	1
Other short-term borrowed funds	9	8
Long-term borrowed funds	82	60
Total interest expense	237	155
Net interest income	1,091	1,005
Provision for credit losses	78	96
Net interest income after provision for credit losses	1,013	909
NONINTEREST INCOME:
Service charges and fees	124	125
Card fees	61	60
Capital markets fees	39	48
Trust and investment services fees	40	39
Letter of credit and loan fees	30	29
Foreign exchange and interest rate products	27	27
Mortgage banking fees	25	23
Securities gains, net	8	4
Net impairment losses recognized in earnings on debt securities	(1)	(1)
Other income	18	25
Total noninterest income	371	379
NONINTEREST EXPENSE:
Salaries and employee benefits	470	446
Outside services	99	91
Occupancy	81	82
Equipment expense	67	67
Amortization of software	46	44
Other operating expense	120	124
Total noninterest expense	883	854
Income before income tax expense	501	434
Income tax expense	113	114
NET INCOME	388	320
Net income available to common stockholders	$ 381	$ 313
Weighted-average common shares outstanding:
Basic (in Shares)	487,500,618	509,451,450
Diluted (in Shares)	489,266,826	511,348,200
Per common share information:
Basic earnings (in Dollars per Share)	$ 0.78	$ 0.61
Diluted earnings (in Dollars per Share)	0.78	0.61
Dividends declared and paid (in Dollars per Share)	$ 0.22	$ 0.14

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 388	$ 320
Other comprehensive loss:
Net unrealized derivative instrument losses arising during the periods, net of income taxes of ($18) and ($2), respectively	(52)	(3)
Reclassification adjustment for net derivative losses (gains) included in net income, net of income taxes of $0 and ($4), respectively	2	(6)
Net unrealized debt securities (losses) gains arising during the periods, net of income taxes of ($86) and $3, respectively	(272)	5
Other-than-temporary impairment not recognized in earnings on debt securities, net of income taxes of ($1) and ($7), respectively	(1)	(12)
Reclassification of net debt securities gains to net income, net of income taxes of ($2) and ($1), respectively	(5)	(2)
Amortization of actuarial loss, net of income taxes of $1 and $2, respectively	3	3
Total other comprehensive loss, net of income taxes	(325)	(15)
Total comprehensive income	$ 63	$ 305

CONSOLIDATED STATEMENTS OF COM6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net unrealized derivative instrument losses arising during the periods, tax	$ (18)	$ (2)
Reclassification adjustment for net derivative losses (gains) included in net income, tax	0	(4)
Net unrealized securities (losses) gains arising during the periods, tax	(86)	3
Other-than-temporary impairment not recognized in earnings on securities, tax	(1)	(7)
Reclassification of net securities gains to net income, tax	(2)	(1)
Amortization of actuarial loss, tax	$ 1	$ 2

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2016		0	512,000,000
Beginning balance at Dec. 31, 2016	$ 19,747	$ 247	$ 6	$ 18,722	$ 2,703	$ (1,263)	$ (668)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common stockholders	(72)				(72)
Dividends to preferred stockholders	(7)				(7)
Treasury stock purchased (in shares)			(3,000,000)
Treasury stock purchased	(130)			25		(155)
Share-based compensation plans (in shares)			1,000,000
Share-based compensation plans	1			1
Employee stock purchase plan shares purchased	3			3
Total comprehensive income:
Net income	320				320
Other comprehensive loss	(15)						(15)
Total comprehensive income	305				320		(15)
Ending balance (in shares) at Mar. 31, 2017		0	510,000,000
Ending balance at Mar. 31, 2017	19,847	$ 247	$ 6	18,751	2,944	(1,418)	(683)
Beginning balance (in shares) at Dec. 31, 2017		0	491,000,000
Beginning balance at Dec. 31, 2017	20,270	$ 247	$ 6	18,781	4,164	(2,108)	(820)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common stockholders	(108)				(108)
Dividends to preferred stockholders	$ (7)				(7)
Treasury stock purchased (in shares)	(3,887,023)		(4,000,000)
Treasury stock purchased	$ (175)					(175)
Share-based compensation plans (in shares)			1,000,000
Share-based compensation plans	13			13
Employee stock purchase plan shares purchased	3			3
Total comprehensive income:
Net income	388				388
Other comprehensive loss	(325)						(325)
Total comprehensive income	63				388		(325)
Ending balance (in shares) at Mar. 31, 2018		0	488,000,000
Ending balance at Mar. 31, 2018	$ 20,059	$ 247	$ 6	$ 18,797	$ 4,437	$ (2,283)	$ (1,145)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
OPERATING ACTIVITIES
Net income		$ 388	$ 320
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		78	96
Originations of mortgage loans held for sale		(614)	(655)
Proceeds from sales of mortgage loans held for sale		655	815
Purchases of commercial loans held for sale		(468)	(384)
Proceeds from sales of commercial loans held for sale		451	380
Depreciation, amortization and accretion		122	124
Mortgage servicing rights valuation (recovery) charge-off		(3)	0
Debt securities impairment		1	1
Deferred income taxes		8	39
Share-based compensation		18	18
Net gain on sales of:
Debt securities		(8)	(4)
Decrease in other assets		331	282
Decrease in other liabilities		(255)	(179)
Net cash provided by operating activities		704	853
Investment securities:
Purchases of debt securities available for sale		(1,099)	(1,705)
Proceeds from maturities and paydowns of debt securities available for sale		806	809
Proceeds from sales of debt securities available for sale		145	404
Purchases of debt securities held to maturity		0	(57)
Proceeds from maturities and paydowns of debt securities held to maturity		131	136
Purchases of equity securities, at fair value		(39)	(73)
Proceeds from sales of equity securities, at fair value		36	68
Purchases of equity securities, at cost		(157)	(98)
Proceeds from sales of equity securities, at cost		131	118
Net decrease in interest-bearing deposits in banks		50	88
Net increase in loans and leases		(1,020)	(769)
Net increase in bank-owned life insurance		(13)	(11)
Premises and equipment:
Purchases		(32)	(14)
Capitalization of software		(57)	(39)
Net cash used in investing activities		(1,118)	(1,143)
FINANCING ACTIVITIES
Net increase in deposits		641	2,308
Net decrease in federal funds purchased and securities sold under agreements to repurchase		(500)	(55)
Net decrease in other short-term borrowed funds		(1,604)	(450)
Proceeds from issuance of long-term borrowed funds		6,250	2,997
Repayments of long-term borrowed funds		(3,250)	(4,000)
Treasury stock purchased		(175)	(130)
Dividends declared and paid to common stockholders		(108)	(72)
Payments of employee tax withholding for share-based compensation		(13)	(19)
Net cash provided by financing activities		1,241	579
Increase in cash and cash equivalents	[1]	827	289
Cash and cash equivalents at beginning of period	[1]	3,032	3,704	$ 3,704
Cash and cash equivalents at end of period	[1]	$ 3,859	$ 3,993	$ 3,032
[1]	Cash and cash equivalents includes cash and due from banks and interest-bearing cash and due from banks as reflected on the Consolidated Balance Sheets.

BASIS OF PRESENTATION

BASIS OF PRESENTATION	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Basis of Presentation The unaudited interim Consolidated Financial Statements, including the Notes thereto of Citizens Financial Group, Inc., have been prepared in accordance with GAAP interim reporting requirements, and therefore do not include all information and Notes included in the audited Consolidated Financial Statements in conformity with GAAP. These unaudited interim Consolidated Financial Statements and Notes thereto should be read in conjunction with the Company’s audited Consolidated Financial Statements and accompanying Notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The Company’s principal business activity is banking, conducted through its subsidiaries, Citizens Bank, National Association and Citizens Bank of Pennsylvania. The unaudited interim Consolidated Financial Statements include the accounts of the Company and subsidiaries in which the Company has a controlling financial interest. All intercompany transactions and balances have been eliminated. The Company has evaluated its unconsolidated entities and does not believe that any entity in which it has an interest, but does not currently consolidate, meets the requirements to be consolidated as a variable interest entity. The unaudited interim Consolidated Financial Statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for credit losses, evaluation of unrealized losses on securities for other-than-temporary impairment, accounting for income taxes, the valuation of AFS and HTM securities, and derivatives. Significant Accounting Policies For further information regarding the Company’s significant accounting policies, see Note 1 “Basis of Presentation” to the Company’s audited Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2017 . Accounting Pronouncements Adopted in 2018 Pronouncement Summary of Guidance Effects on Financial Statements Revenue Recognition: Revenue from Contracts with Customers Issued May 2014 • Requires that revenue from contracts with customers be recognized upon transfer of control of a good or service in the amount of consideration expected to be received. • Changes the accounting for certain contract costs including whether they may be offset against revenues in the Consolidated Statements of Operations. • Requires new qualitative and quantitative disclosures, including information about disaggregation of revenue and performance obligations. • May be adopted using a full retrospective approach or a modified cumulative effect approach wherein the guidance is applied only to existing contracts as of the date of initial adoption and to new contracts transacted after that date. • The Company adopted the new standard on January 1, 2018 under the modified retrospective method. Net interest income on financial assets and liabilities is explicitly excluded from the scope of the pronouncement. • Adoption of the new standard did not result in a change in the timing or amount of revenue recognized from contracts with customers. The Company did not recognize a cumulative adjustment to Retained Earnings upon adoption. • Effective January 1, 2018, underwriting fees are presented on a gross basis in capital market fees, while underwriting costs are presented in other operating expense. Prior to adoption, such costs were presented net of the related underwriting fees. Stock Compensation Issued May 2017 • Requires modification accounting unless the fair value, vesting conditions, and classification of the modified award are the same as the original award immediately before the modification. • Applied prospectively to all modifications of share-based awards after the adoption date. • The Company adopted the new standard as of January 1, 2018. • Adoption did not have an impact on the Company’s Consolidated Financial Statements. Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost • Requires the service cost component of net periodic pension and postretirement benefit cost to be reported separately in the Consolidated Statements of Operations from the other components (e.g., expected return on assets, interest costs, amortization of gains/losses and prior service costs). • Requires presentation in the Consolidated Statements of Operations of the service cost component in the same line item as other employee compensation costs and presentation of the other components in a different line item from the service cost component. • Retrospective application is required for all periods presented. • The Company retrospectively adopted the new standard as of January 1, 2018. • Adoption did not have an impact on the Company’s net income. • The Company reclassified prior period amounts in the Consolidated Statement of Operations, which resulted in an immaterial increase in salaries and employee benefits and a corresponding decrease in other operating expense. Recognition and Measurement of Financial Assets and Financial Liabilities Issued January 2016 • Requires equity securities with readily determinable fair values to be measured at fair value on the balance sheet, with changes in the fair value recognized through earnings. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial assets on the balance sheet or the notes to the financial statements. • Makes several other targeted amendments to the existing accounting and disclosure requirements for financial instruments, including revised guidance related to valuation allowance assessments when recognizing deferred tax assets on unrealized losses on debt securities available for sale. • The Company adopted the new standard as of January 1, 2018. • Adoption had an immaterial impact on the Company’s Consolidated Financial Statements. Classification of Certain Cash Receipts and Cash Payments Issued August 2016 • Amends current guidance on specific cashflows to determine the appropriate classification as operating, investing or financing activities which has required significant judgment. • The application of judgment has resulted in diversity in how certain cash receipts and cash payments are classified. • The Company adopted the new standard as of January 1, 2018. • Adoption did not have an impact on the Company’s Consolidated Financial Statements. Accounting Pronouncements Pending Adoption Pronouncement Summary of Guidance Effects on Financial Statements Derivatives and Hedging Issued August 2017 • Reduces the complexity and operational burdens of the current hedge accounting model and portrays more clearly the effects of hedge accounting in the financial statements. • Modifies current requirements to facilitate the application of hedge accounting to partial-term hedges, hedges of prepayable financial instruments, and other strategies. Adoption of these optional changes would occur on a prospective basis. • Requires the effects of fair value hedges to be classified in the same income statement line as the earnings effect of the hedged item. Adoption of this change will occur on a prospective basis. • Requires all effects of cash flow hedges to be deferred in other comprehensive income until the hedged cash flows affect earnings. Periodic hedge ineffectiveness will no longer be recognized in earnings. Adoption of this change will occur on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. • Required effective date: January 1, 2019. Early adoption is permitted. The Company is still evaluating whether or not it will adopt this guidance prior to the required effective date. • The transition entries required upon adoption are not expected to have a material impact on the Company’s Consolidated Financial Statements. Leases Issued February 2016 • Requires lessees to recognize a right-of-use asset and corresponding lease liability for all leases with a lease term of greater than one year. • Requires lessees and lessors to classify most leases using principles similar to existing lease accounting, but eliminates the “bright line” classification tests. • Requires that for finance leases, a lessee recognize interest expense on the lease liability separately from the amortization of the right-of-use asset in the Consolidated Statements of Operations, while for operating leases, such amounts should be recognized as a combined expense. • Requires expanded disclosures about the nature and terms of lease agreements. • Requires adoption using a modified cumulative effect approach wherein the guidance is applied to all periods presented. • Requires companies with land easements to assess whether the easement meets the definition of a lease before applying other accounting guidance. • Required effective date: January 1, 2019. Early adoption is permitted. The Company does not intend to adopt the guidance prior to the effective date. • The Company occupies certain banking offices and equipment under non-cancelable operating lease agreements, which currently are not reflected on its Consolidated Balance Sheets. • The Company expects to report increased assets and liabilities as a result of recognizing right-of-use assets and lease liabilities in its Consolidated Balance Sheets. As of December 31, 2017, the Company was committed to $842 million of minimum lease payments under non-cancelable operating lease agreements. • The evaluation of the impact of the leasing pronouncement will be adjusted based on execution of new leases, termination of existing leases prior to the effective date, and any changes to key lease assumptions such as renewals, extensions and discount rates. • The Company does not expect a material change to the timing of expense recognition on the Consolidated Statements of Operations. Financial Instruments - Credit Losses Issued June 2016 • Replaces existing incurred loss impairment guidance and establishes a single allowance framework for financial assets carried at amortized cost (including securities HTM), which will reflect management’s estimate of credit losses over the full remaining expected life of the financial assets. • Amends existing impairment guidance for securities AFS to incorporate an allowance, which will allow for reversals of impairment losses in the event that the credit of an issuer improves. • Requires a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. • Required effective date: January 1, 2020. Early adoption permitted on January 1, 2019. The Company does not intend to adopt the guidance prior to the effective date. • The Company established a company-wide, cross-discipline governance structure to implement the new standard. The Company is currently identifying and researching key interpretive issues and is in the process of developing models that meet the requirements of the new guidance. The implementation team is also in the process of assessing forecast accuracy and potential macroeconomic factors that will be used to determine the reasonable and supportable forecast period. • The Company expects the standard will result in earlier recognition of credit losses and an increase in the allowance for credit losses, as it will cover credit losses over the full remaining expected life of loans and commitments and will consider future reasonable and supportable changes in macroeconomic conditions. Since the magnitude of the increase in the Company’s allowance for credit losses will be impacted by economic conditions and trends in the Company’s portfolio at the time of adoption, the quantitative impact cannot yet be reasonably estimated.

SECURITIES

SECURITIES	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The following table presents the major components of securities at amortized cost and fair value: March 31, 2018 December 31, 2017 (in millions) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available for Sale, At Fair Value U.S. Treasury and other $12 $— $— $12 $12 $— $— $12 State and political subdivisions 6 — — 6 6 — — 6 Mortgage-backed securities: Federal agencies and U.S. government sponsored entities 20,257 19 (622 ) 19,654 20,065 40 (277 ) 19,828 Other/non-agency 288 5 (7 ) 286 311 7 (7 ) 311 Total mortgage-backed securities 20,545 24 (629 ) 19,940 20,376 47 (284 ) 20,139 Total debt securities available for sale, at fair value $20,563 $24 ($629 ) $19,958 $20,394 $47 ($284 ) $20,157 Debt Securities Held to Maturity Mortgage-backed securities: Federal agencies and U.S. government sponsored entities $3,747 $— ($125 ) $3,622 $3,853 $7 ($46 ) $3,814 Other/non-agency 808 10 (1 ) 817 832 22 — 854 Total mortgage-backed securities 4,555 10 (126 ) 4,439 4,685 29 (46 ) 4,668 Total debt securities held to maturity $4,555 $10 ($126 ) $4,439 $4,685 $29 ($46 ) $4,668 Equity Securities, at Fair Value Money market mutual fund $168 $— $— $168 $165 $— $— $165 Other investments 4 — — 4 4 — — 4 Total equity securities, at fair value $172 $— $— $172 $169 $— $— $169 Equity Securities, at Cost Federal Reserve Bank stock $463 $— $— $463 $463 $— $— $463 Federal Home Loan Bank stock 278 — — 278 252 — — 252 Other equity securities 7 — — 7 7 — — 7 Total equity securities, at cost $748 $— $— $748 $722 $— $— $722 The amortized cost and fair value of debt securities by contractual maturity as of March 31, 2018 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without incurring penalties. March 31, 2018 Distribution of Maturities (in millions) 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: Debt securities available for sale U.S. Treasury and other $12 $— $— $— $12 State and political subdivisions — — — 6 6 Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — 229 1,194 18,834 20,257 Other/non-agency 3 15 — 270 288 Total debt securities available for sale 15 244 1,194 19,110 20,563 Debt securities held to maturity Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — — — 3,747 3,747 Other/non-agency — — — 808 808 Total debt securities held to maturity — — — 4,555 4,555 Total amortized cost of debt securities $15 $244 $1,194 $23,665 $25,118 Fair Value: Debt securities available for sale U.S. Treasury and other $12 $— $— $— $12 State and political subdivisions — — — 6 6 Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — 227 1,174 18,253 19,654 Other/non-agency 3 15 — 268 286 Total debt securities available for sale 15 242 1,174 18,527 19,958 Debt securities held to maturity Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — — — 3,622 3,622 Other/non-agency — — — 817 817 Total debt securities held to maturity — — — 4,439 4,439 Total fair value of debt securities $15 $242 $1,174 $22,966 $24,397 Taxable interest income from investment securities as presented on the Consolidated Statements of Operations was $168 million and $160 million for the three months ended March 31, 2018 and 2017 , respectively. Realized gains and losses on securities are presented below: Three Months Ended March 31, (in millions) 2018 2017 Gains on sale of debt securities $8 $4 Losses on sale of debt securities — — Debt securities gains, net $8 $4 The amortized cost and fair value of debt securities pledged are presented below: March 31, 2018 December 31, 2017 (in millions) Amortized Cost Fair Value Amortized Cost Fair Value Pledged against repurchase agreements $325 $316 $358 $357 Pledged against FHLB borrowed funds 814 822 839 861 Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law 3,118 3,016 3,113 3,082 The Company regularly enters into security repurchase agreements with unrelated counterparties. Repurchase agreements are financial transactions that involve the transfer of a security from one party to another and a subsequent transfer of substantially the same security back to the original party. The Company’s repurchase agreements are typically short-term transactions and accounted for as secured borrowed funds on the Company’s Consolidated Balance Sheets. When permitted by GAAP, the Company offsets short-term receivables associated with its reverse repurchase agreements against short-term payables associated with its repurchase agreements. The Company recognized no offsetting of short-term receivables or payables as of March 31, 2018 or December 31, 2017 . The Company offsets certain derivative assets and derivative liabilities on the Consolidated Balance Sheets. For further information see Note 8 “Derivatives.” Securitizations of mortgage loans retained in the investment portfolio for the three months ended March 31, 2018 and 2017 were $26 million and $22 million , respectively. These securitizations include a substantive guarantee by a third party. In 2018 and 2017, the guarantors were Fannie Mae and Ginnie Mae. The debt securities received from the guarantors are classified as AFS. The following tables present mortgage-backed debt securities whose fair values are below carrying values, segregated by those that have been in a continuous unrealized loss position for less than twelve months and those that have been in a continuous unrealized loss position for twelve months or longer: March 31, 2018 Less than 12 Months 12 Months or Longer Total (dollars in millions) Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Federal agencies and U.S. government sponsored entities 414 $14,541 ($352 ) 154 $7,624 ($395 ) 568 $22,165 ($747 ) Other/non-agency 9 154 (3 ) 10 80 (5 ) 19 234 (8 ) Total 423 $14,695 ($355 ) 164 $7,704 ($400 ) 587 $22,399 ($755 ) December 31, 2017 Less than 12 Months 12 Months or Longer Total (dollars in millions) Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Federal agencies and U.S. government sponsored entities 294 $10,163 ($97 ) 152 $8,061 ($226 ) 446 $18,224 ($323 ) Other/non-agency 6 55 (1 ) 10 84 (6 ) 16 139 (7 ) Total 300 $10,218 ($98 ) 162 $8,145 ($232 ) 462 $18,363 ($330 ) The following table presents the cumulative credit-related losses recognized in earnings on debt securities held by the Company: Three Months Ended March 31, (in millions) 2018 2017 Cumulative balance at beginning of period $80 $75 Credit impairments recognized in earnings on debt securities that have been previously impaired 1 1 Reductions due to increases in cash flow expectations on impaired debt securities (1) (1 ) (1 ) Cumulative balance at end of period $80 $75 (1) Reported in interest income from investment securities on the Consolidated Statements of Operations. Cumulative credit losses recognized in earnings for impaired AFS debt securities held as of March 31, 2018 and 2017 were $80 million and $75 million , respectively. There were no credit losses recognized in earnings for the Company’s HTM portfolio as of March 31, 2018 and 2017 . For both the three months ended March 31, 2018 and 2017 , the Company incurred non-agency MBS credit-related other-than-temporary impairment losses in earnings of $1 million . There were no credit-impaired debt securities sold during the three months ended March 31, 2018 and 2017 . The Company does not currently have the intent to sell these impaired debt securities, and it is not more likely than not that the Company will be required to sell these debt securities prior to the recovery of their amortized cost bases. The Company has determined that credit losses are not expected to be incurred on the remaining agency and non-agency MBS identified with unrealized losses as of March 31, 2018 . The unrealized losses on these debt securities reflect non-credit-related factors such as changing interest rates and market liquidity. Therefore, the Company has determined that these debt securities are not other-than-temporarily impaired because the Company does not currently have the intent to sell these debt securities, and it is not more likely than not that the Company will be required to sell these debt securities prior to the recovery of their amortized cost bases. Any subsequent increases in the valuation of impaired debt securities do not impact their recorded cost bases.

LOANS AND LEASES

LOANS AND LEASES	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
LOANS AND LEASES	LOANS AND LEASES The Company’s loans and leases are disclosed in portfolio segments and classes. The Company’s loan and lease portfolio segments are commercial and retail. The classes of loans and leases are: commercial, commercial real estate, leases, residential mortgages, home equity loans, home equity lines of credit, home equity loans serviced by others, home equity lines of credit serviced by others, automobile, education, credit cards and other retail. The Company’s SBO portfolio consists of purchased home equity loans and lines that were originally serviced by others, which the Company services a portion of internally. A summary of the loans and leases portfolio is presented below: (in millions) March 31, 2018 December 31, 2017 Commercial $38,277 $37,562 Commercial real estate 11,775 11,308 Leases 3,092 3,161 Total commercial loans and leases 53,144 52,031 Residential mortgages 17,346 17,045 Home equity loans 1,298 1,392 Home equity lines of credit 13,190 13,483 Home equity loans serviced by others 504 542 Home equity lines of credit serviced by others 136 149 Automobile 12,794 13,204 Education 8,324 8,134 Credit cards 1,808 1,848 Other retail 2,881 2,789 Total retail loans 58,281 58,586 Total loans and leases (1) (2) $111,425 $110,617 (1) Excluded from the table above are loans held for sale totaling $800 million and $718 million as of March 31, 2018 and December 31, 2017 , respectively. (2) Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $20.2 billion and $20.3 billion at March 31, 2018 and December 31, 2017 , respectively. The following tables present balances of loan purchases and sales: Three Months Ended March 31, 2018 (in millions) Education Automobile Residential mortgages Home equity loans Commercial Total Purchases $— $— $— $— $200 $200 Sales — — — — — — Three Months Ended March 31, 2017 (in millions) Education Automobile Residential mortgages Home equity loans Commercial Total Purchases $325 $123 $— $— $— $448 Sales — — — — — — Loans held for sale at fair value as of March 31, 2018 totaled $478 million and consisted of residential mortgages originated for sale of $289 million and loans in the commercial trading portfolio of $189 million . Loans held for sale at fair value as of December 31, 2017 totaled $497 million and consisted of residential mortgages originated for sale of $326 million and loans in the commercial trading portfolio of $171 million . Other loans held for sale totaled $322 million and $221 million as of March 31, 2018 and December 31, 2017 , respectively, and consisted of commercial loans associated with the Company’s syndication business. Loans pledged as collateral for FHLB borrowed funds, primarily residential mortgages and home equity loans, totaled $25.4 billion and $24.9 billion at March 31, 2018 and December 31, 2017 , respectively. Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window, if necessary, was primarily comprised of auto and commercial loans, and totaled $17.8 billion and $18.1 billion at March 31, 2018 and December 31, 2017 , respectively.

ALLOWANCE FOR CREDIT LOSSES, NO

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK	ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK The allowance for credit losses consists of the ALLL and the reserve for unfunded commitments. It is increased through a provision for credit losses that is charged to earnings, based on the Company’s quarterly evaluation of the loan portfolio, and is reduced by net charge-offs and the ALLL associated with sold loans. See Note 5 “Allowance for Credit Losses, Nonperforming Assets, and Concentrations of Credit Risk” to the Company’s audited Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2017 , for a detailed discussion of the ALLL reserve methodology and estimation techniques. On a quarterly basis, the Company reviews and refines its estimate of the allowance for credit losses, taking into consideration changes in portfolio size and composition, historical loss experience, internal risk ratings, current economic conditions, industry performance trends and other pertinent information. As of March 31, 2018, there were no material changes in assumptions or estimation techniques compared with prior periods that impacted the determination of the current period’s ALLL and the reserve for unfunded lending commitments. As of December 31, 2017, the Company enhanced the method for assessing various qualitative risks, factors and events that may not be measured in the modeled results. The new methodology includes a statistical analysis of prior charge-off rates on a historical basis combined with a qualitative assessment based on quantitative measures affecting the determination of incurred losses in the loan and lease portfolio, and provides better alignment of the qualitative ALLL to the commercial and retail loan portfolios. The impact of the change was an increase of approximately $50 million to the commercial ALLL with a corresponding decrease to the retail ALLL; there was not a significant impact on the total qualitative ALLL as of December 31, 2017. A summary of changes in the allowance for credit losses is presented below: Three Months Ended March 31, 2018 (in millions) Commercial Retail Total Allowance for loan and lease losses, beginning of period $685 $551 $1,236 Charge-offs (3 ) (113 ) (116 ) Recoveries 6 40 46 Net recoveries (charge-offs) 3 (73 ) (70 ) Provision charged to income 23 57 80 Allowance for loan and lease losses, end of period 711 535 1,246 Reserve for unfunded lending commitments, beginning of period 88 — 88 Provision for unfunded lending commitments (2 ) — (2 ) Reserve for unfunded lending commitments, end of period 86 — 86 Total allowance for credit losses, end of period $797 $535 $1,332 Three Months Ended March 31, 2017 (in millions) Commercial Retail Total Allowance for loan and lease losses, beginning of period $663 $573 $1,236 Charge-offs (24 ) (109 ) (133 ) Recoveries 5 41 46 Net charge-offs (19 ) (68 ) (87 ) Provision charged to income 9 66 75 Allowance for loan and lease losses, end of period 653 571 1,224 Reserve for unfunded lending commitments, beginning of period 72 — 72 Provision for unfunded lending commitments 21 — 21 Reserve for unfunded lending commitments, end of period 93 — 93 Total allowance for credit losses, end of period $746 $571 $1,317 The recorded investment in loans and leases based on the Company’s evaluation methodology is presented below: March 31, 2018 December 31, 2017 (in millions) Commercial Retail Total Commercial Retail Total Individually evaluated $403 $748 $1,151 $370 $761 $1,131 Formula-based evaluation 52,741 57,533 110,274 51,661 57,825 109,486 Total $53,144 $58,281 $111,425 $52,031 $58,586 $110,617 A summary of the allowance for credit losses by evaluation method is presented below: March 31, 2018 December 31, 2017 (in millions) Commercial Retail Total Commercial Retail Total Individually evaluated $47 $28 $75 $47 $34 $81 Formula-based evaluation 750 507 1,257 726 517 1,243 Allowance for credit losses $797 $535 $1,332 $773 $551 $1,324 For commercial loans and leases, the Company utilizes regulatory classification ratings to monitor credit quality. Loans with a “pass” rating are those that the Company believes will be fully repaid in accordance with the contractual loan terms. Commercial loans and leases that are “criticized” are those that have some weakness or potential weakness that indicate an increased probability of future loss. “Criticized” loans are grouped into three categories, “special mention,” “substandard” and “doubtful.” Special mention loans have potential weaknesses that, if left uncorrected, may result in deterioration of the Company’s credit position at some future date. Substandard loans are inadequately protected loans; these loans have well-defined weaknesses that could hinder normal repayment or collection of the debt. Doubtful loans have the same weaknesses as substandard, with the added characteristics that the possibility of loss is high and collection of the full amount of the loan is improbable. For retail loans, the Company primarily uses the loan’s payment and delinquency status to monitor credit quality. The further a loan is past due, the greater the likelihood of future credit loss. These credit quality indicators for both commercial and retail loans are continually updated and monitored. The recorded investment in commercial loans and leases based on regulatory classification ratings is presented below: March 31, 2018 Criticized (in millions) Pass Special Mention Substandard Doubtful Total Commercial $35,511 $1,644 $910 $212 $38,277 Commercial real estate 11,195 505 47 28 11,775 Leases 2,972 77 43 — 3,092 Total commercial loans and leases $49,678 $2,226 $1,000 $240 $53,144 December 31, 2017 Criticized (in millions) Pass Special Mention Substandard Doubtful Total Commercial $35,430 $1,143 $785 $204 $37,562 Commercial real estate 10,706 500 74 28 11,308 Leases 3,069 73 19 — 3,161 Total commercial loans and leases $49,205 $1,716 $878 $232 $52,031 The recorded investment in classes of retail loans, categorized by delinquency status is presented below: March 31, 2018 Days Past Due (in millions) Current 1-29 30-59 60-89 90 or More Total Residential mortgages $17,092 $89 $35 $9 $121 $17,346 Home equity loans 1,144 87 12 5 50 1,298 Home equity lines of credit 12,575 343 55 19 198 13,190 Home equity loans serviced by others 449 25 10 1 19 504 Home equity lines of credit serviced by others 107 17 4 1 7 136 Automobile 11,540 994 173 37 50 12,794 Education 8,162 112 22 15 13 8,324 Credit cards 1,728 43 11 8 18 1,808 Other retail 2,777 61 21 11 11 2,881 Total $55,574 $1,771 $343 $106 $487 $58,281 December 31, 2017 Days Past Due (in millions) Current 1-29 30-59 60-89 90 or More Total Residential mortgages $16,714 $147 $46 $18 $120 $17,045 Home equity loans 1,212 102 20 4 54 1,392 Home equity lines of credit 12,756 438 78 23 188 13,483 Home equity loans serviced by others 477 29 10 4 22 542 Home equity lines of credit serviced by others 116 21 4 1 7 149 Automobile 11,596 1,273 220 55 60 13,204 Education 7,898 160 23 12 41 8,134 Credit cards 1,747 63 12 9 17 1,848 Other retail 2,679 68 20 12 10 2,789 Total retail loans $55,195 $2,301 $433 $138 $519 $58,586 Nonperforming Assets The following table presents nonperforming loans and leases and loans accruing and 90 days or more past due: Nonperforming Accruing and 90 days or more past due (in millions) March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Commercial $244 $238 $1 $5 Commercial real estate 30 27 — 3 Leases — — 2 — Total commercial loans and leases 274 265 3 8 Residential mortgages (1) 128 128 14 16 Home equity loans 66 72 — — Home equity lines of credit 235 233 — — Home equity loans serviced by others 23 25 — — Home equity lines of credit serviced by others 17 18 — — Automobile 60 70 — — Education 41 38 3 3 Credit card 18 17 — — Other retail 6 5 6 5 Total retail loans 594 606 23 24 Total retail loans $868 $871 $26 $32 (1) Nonperforming balances exclude first lien residential mortgage loans that are 100% guaranteed by the Federal Housing Administration. These loans, which are accruing and 90 days or more past due, totaled $14 million and $15 million as of March 31, 2018 and December 31, 2017 , respectively. Nonperforming balances also exclude guaranteed residential mortgage loans sold to GNMA for which the Company has the right, but not the obligation, to repurchase. These loans totaled $24 million and $30 million as of March 31, 2018 and December 31, 2017 , respectively. These loans are included in the Company’s Consolidated Balance Sheets. Other nonperforming assets consisted primarily of other real estate owned and was presented in other assets on the Consolidated Balance Sheets. Other real estate owned, net of valuation allowance, was $34 million and $36 million as of March 31, 2018 and December 31, 2017, respectively. A summary of nonperforming loan and lease key performance indicators is presented below: March 31, 2018 December 31, 2017 Nonperforming commercial loans and leases as a percentage of total loans and leases 0.25 % 0.24 % Nonperforming retail loans as a percentage of total loans and leases 0.53 0.55 Total nonperforming loans and leases as a percentage of total loans and leases 0.78 % 0.79 % Nonperforming commercial assets as a percentage of total assets 0.18 % 0.17 % Nonperforming retail assets as a percentage of total assets 0.41 % 0.43 % Total nonperforming assets as a percentage of total assets 0.59 % 0.60 % The recorded investment in mortgage loans collateralized by residential real estate property for which formal foreclosure proceedings are in process was $184 million and $181 million as of March 31, 2018 and December 31, 2017 , respectively. An analysis of the age of both accruing and nonaccruing loan and lease past due amounts is presented below: March 31, 2018 December 31, 2017 Days Past Due Days Past Due (in millions) 30-59 60-89 90 or More Total 30-59 60-89 90 or More Total Commercial $30 $23 $63 $116 $26 $4 $243 $273 Commercial real estate 42 1 28 71 38 20 30 88 Leases 3 — 2 5 4 1 — 5 Total commercial loans and leases 75 24 93 192 68 25 273 366 Residential mortgages 35 9 121 165 46 18 120 184 Home equity loans 12 5 50 67 20 4 54 78 Home equity lines of credit 55 19 198 272 78 23 188 289 Home equity loans serviced by others 10 1 19 30 10 4 22 36 Home equity lines of credit serviced by others 4 1 7 12 4 1 7 12 Automobile 173 37 50 260 220 55 60 335 Education 22 15 13 50 23 12 41 76 Credit cards 11 8 18 37 12 9 17 38 Other retail 21 11 11 43 20 12 10 42 Total retail loans 343 106 487 936 433 138 519 1,090 Total $418 $130 $580 $1,128 $501 $163 $792 $1,456 Impaired Loans Impaired loans include nonaccruing larger balance (greater than $3 million carrying value), non-homogeneous commercial and commercial real estate loans, and restructured loans that are deemed TDRs. A summary of impaired loans by class is presented below: March 31, 2018 (in millions) Impaired Loans With a Related Allowance Allowance on Impaired Loans Impaired Loans Without a Related Allowance Unpaid Contractual Balance Total Recorded Investment in Impaired Loans Commercial $211 $42 $167 $447 $378 Commercial real estate 25 5 — 40 25 Leases — — — — — Total commercial loans and leases 236 47 167 487 403 Residential mortgages 27 2 124 197 151 Home equity loans 38 3 78 156 116 Home equity lines of credit 16 1 182 242 198 Home equity loans serviced by others 28 2 22 65 50 Home equity lines of credit serviced by others 2 — 7 13 9 Automobile 2 — 22 30 24 Education 144 12 25 169 169 Credit cards 24 7 — 25 24 Other retail 4 1 3 9 7 Total retail loans 285 28 463 906 748 Total $521 $75 $630 $1,393 $1,151 December 31, 2017 (in millions) Impaired Loans With a Related Allowance Allowance on Impaired Loans Impaired Loans Without a Related Allowance Unpaid Contractual Balance Total Recorded Investment in Impaired Loans Commercial $183 $42 $159 $403 $342 Commercial real estate 25 5 3 40 28 Leases — — — — — Total commercial loans and leases 208 47 162 443 370 Residential mortgages 25 2 126 197 151 Home equity loans 41 4 80 162 121 Home equity lines of credit 16 1 181 241 197 Home equity loans serviced by others 29 2 22 67 51 Home equity lines of credit serviced by others 2 — 7 14 9 Automobile 2 — 21 30 23 Education 154 17 21 175 175 Credit cards 24 7 1 25 25 Other retail 5 1 4 10 9 Total retail loans 298 34 463 921 761 Total $506 $81 $625 $1,364 $1,131 Additional information on impaired loans is presented below: Three Months Ended March 31, 2018 2017 (in millions) Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Commercial $2 $293 $1 $396 Commercial real estate — 27 — 45 Leases — — — — Total commercial loans and leases 2 320 1 441 Residential mortgages 1 149 1 176 Home equity loans 2 118 2 146 Home equity lines of credit 2 194 2 198 Home equity loans serviced by others 1 50 1 57 Home equity lines of credit serviced by others — 9 — 9 Automobile — 22 — 19 Education 2 171 2 152 Credit cards — 24 — 25 Other retail — 8 — 11 Total retail loans 8 745 8 793 Total $10 $1,065 $9 $1,234 Troubled Debt Restructurings In situations where, for economic or legal reasons related to the borrower’s financial difficulties, the Company grants a concession to the borrower that it would not otherwise consider, the related loan is classified as a TDR. TDRs typically result from the Company’s loss mitigation efforts and are undertaken in order to improve the likelihood of recovery and continuity of the relationship. The Company’s loan modifications are handled on a case-by-case basis and are negotiated to achieve mutually agreeable terms that maximize loan collectability and meet the borrower’s financial needs. Concessions granted in TDRs for all classes of loans may include lowering the interest rate, forgiving a portion of principal, extending the loan term, lowering scheduled payments for a specified period of time, waiving or delaying a scheduled payment of principal or interest for other than an insignificant time period, or capitalizing past due amounts. A rate increase can be a concession if the increased rate is lower than a market rate for debt with risk similar to that of the restructured loan. TDRs for commercial loans and leases may also involve creating a multiple note structure, accepting non-cash assets, accepting an equity interest, or receiving a performance-based fee. In some cases, a TDR may involve multiple concessions. The financial effects of TDRs for all loan classes may include lower income (either due to a lower interest rate or a delay in the timing of cash flows), larger loan loss provisions, and accelerated charge-offs if the modification renders the loan collateral-dependent. In some cases, interest income throughout the term of the loan may increase if, for example, the loan is extended or the interest rate is increased as a result of the restructuring. Because TDRs are impaired loans, the Company measures impairment by comparing the present value of expected future cash flows, or when appropriate, the fair value of collateral less costs to sell, to the loan’s recorded investment. Any excess of recorded investment over the present value of expected future cash flows or collateral value is included in the ALLL. Any portion of the loan’s recorded investment the Company does not expect to collect as a result of the modification is charged off at the time of modification. For Retail TDR accounts where the expected value of cash flows is utilized, any recorded investment in excess of the present value of expected cash flows is recognized by creating or increasing the ALLL. For Retail TDR accounts assessed based on the fair value of collateral, any portion of the loan’s recorded investment in excess of the collateral value less costs to sell is charged off at the time of modification or at the time of subsequent and regularly recurring valuations. The table below summarizes TDRs by class and total unfunded commitments: (in millions) March 31, 2018 December 31, 2017 Commercial $202 $129 Retail 748 761 Unfunded commitments tied to TDRs 35 39 The table below summarizes how loans were modified during the three months ended March 31, 2018 , the charge-offs related to the modifications, and the impact on the ALLL. The reported balances can include loans that became TDRs during the three months ended March 31, 2018 and were paid off in full, charged off, or sold prior to March 31, 2018 . Primary Modification Types Interest Rate Reduction (1) Maturity Extension (2) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial 1 $— $— 6 $1 $1 Commercial real estate — — — 1 — — Leases — — — — — — Total commercial loans and leases 1 — — 7 1 1 Residential mortgages 7 1 1 7 1 1 Home equity loans 11 1 1 — — — Home equity lines of credit 15 1 1 42 5 5 Home equity loans serviced by others 1 — — — — — Home equity lines of credit serviced by others 2 — — — — — Automobile 36 1 1 17 1 1 Education — — — — — — Credit cards 594 3 3 — — — Other retail 1 — — — — — Total retail loans 667 7 7 66 7 7 Total 668 $7 $7 73 $8 $8 Primary Modification Types Other (3) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Net Change to ALLL Resulting from Modification Charge-offs Resulting from Modification Commercial 18 $74 $75 $— $— Commercial real estate — — — — — Leases — — — — — Total commercial loans and leases 18 74 75 — — Residential mortgages 53 6 6 — — Home equity loans 32 2 2 — — Home equity lines of credit 93 7 7 — — Home equity loans serviced by others 7 — — — — Home equity lines of credit serviced by others 3 — — — — Automobile 269 5 4 — 1 Education 112 1 1 — — Credit cards — — — — — Other retail 4 — — 1 — Total retail loans 573 21 20 1 1 Total 591 $95 $95 $1 $1 (1) Includes modifications that consist of multiple concessions, one of which is an interest rate reduction. (2) Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction). (3) Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forgiveness, and capitalizing arrearages. Also included are the following: deferrals, trial modifications, certain bankruptcies, loans in forbearance and prepayment plans. Modifications can include the deferral of accrued interest resulting in post modification balances being higher than pre-modification. The table below summarizes how loans were modified during the three months ended March 31, 2017 , the charge-offs related to the modifications, and the impact on the ALLL. The reported balances can include loans that became TDRs during the three months ended March 31, 2017 and were paid off in full, charged off, or sold prior to March 31, 2017 . Primary Modification Types Interest Rate Reduction (1) Maturity Extension (2) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial 2 $1 $1 7 $1 $1 Commercial real estate — — — — — — Leases — — — — — — Total commercial loans and leases 2 1 1 7 1 1 Residential mortgages 18 1 2 11 3 3 Home equity loans 21 1 1 1 — — Home equity lines of credit 16 1 1 51 6 6 Home equity loans serviced by others 6 1 1 — — — Home equity lines of credit serviced by others 1 — — 2 — — Automobile 40 1 1 8 — — Education — — — — — — Credit cards 565 3 3 — — — Other retail 1 — — — — — Total retail loans 668 8 9 73 9 9 Total 670 $9 $10 80 $10 $10 Primary Modification Types Other (3) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Net Change to ALLL Resulting from Modification Charge-offs Resulting from Modification Commercial — $— $— $— $— Commercial real estate — — — — — Leases 1 1 1 — — Total commercial loans and leases 1 1 1 — — Residential mortgages 48 4 4 — — Home equity loans 102 6 6 — — Home equity lines of credit 75 6 6 — — Home equity loans serviced by others 14 1 1 — — Home equity lines of credit serviced by others 11 1 1 — — Automobile 276 5 4 — 1 Education 15 1 1 — — Credit cards — — — 1 — Other retail 1 — — — — Total retail loans 542 24 23 1 1 Total 543 $25 $24 $1 $1 (1) Includes modifications that consist of multiple concessions, one of which is an interest rate reduction. (2) Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction). (3) Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forgiveness, and capitalizing arrearages. Also included are the following: deferrals, trial modifications, certain bankruptcies, loans in forbearance and prepayment plans. Modifications can include the deferral of accrued interest resulting in post modification balances being higher than pre-modification. The table below summarizes TDRs that defaulted within 12 months of their modification date during the three months ended March 31, 2018 and 2017 , respectively. For purposes of this table, a payment default refers to a loan that becomes 90 days or more past due under the modified terms. Amounts represent the loan’s recorded investment at the time of payment default. If a TDR of any loan type becomes 90 days past due after being modified, the loan is written down to the fair value of collateral less cost to sell. The amount written off is charged to the ALLL. Three Months Ended March 31, 2018 2017 (dollars in millions) Number of Contracts Balance Defaulted Number of Contracts Balance Defaulted Commercial 3 $3 1 $— Commercial real estate — — 1 4 Leases — — — — Total commercial loans and leases 3 3 2 4 Residential mortgages 26 3 45 6 Home equity loans 11 1 9 — Home equity lines of credit 66 5 35 3 Home equity loans serviced by others 5 — 1 — Home equity lines of credit serviced by others 1 — 3 — Automobile 46 — 34 — Education 5 — 7 — Credit cards 119 1 126 1 Other retail — — 2 — Total retail loans 279 10 262 10 Total 282 $13 264 $14 Concentrations of Credit Risk Most of the Company’s lending activity is with customers located in the New England, Mid-Atlantic and Midwest regions. Generally, loans are collateralized by assets including real estate, inventory, accounts receivable, other personal property and investment securities. As of March 31, 2018 and December 31, 2017 , the Company had a significant amount of loans collateralized by residential and commercial real estate. There were no significant concentration risks within the commercial loan or retail loan portfolios. Exposure to credit losses arising from lending transactions may fluctuate with fair values of collateral supporting loans, which may not perform according to contractual agreements. The Company’s policy is to collateralize loans to the extent necessary; however, unsecured loans are also granted on the basis of the financial strength of the applicant and the facts surrounding the transaction. Certain loan products, including residential mortgages, home equity loans and lines of credit, and credit cards, have contractual features that may increase credit exposure to the Company in the event of an increase in interest rates or a decline in housing values. These products include loans that exceed 90% of the value of the underlying collateral (high LTV loans), interest-only and negative amortization residential mortgages, and loans with low introductory rates. Certain loans have more than one of these characteristics. The following tables present balances of loans with these characteristics: March 31, 2018 (in millions) Residential Mortgages Home Equity Loans and Lines of Credit Home Equity Products Serviced by Others Credit Cards Education Total High loan-to-value $357 $160 $230 $— $— $747 Interest-only/negative amortization 1,765 — — — 1 1,766 Low introductory rate — — — 190 — 190 Multiple characteristics and other 1 — — — — 1 Total $2,123 $160 $230 $190 $1 $2,704 December 31, 2017 (in millions) Residential Mortgages Home Equity Loans and Lines of Credit Home Equity Products Serviced by Others Credit Cards Education Total High loan-to-value $366 $166 $264 $— $— $796 Interest-only/negative amortization 1,763 — — — 1 1,764 Low introductory rate — — — 197 — 197 Multiple characteristics and other 1 — — — — 1 Total $2,130 $166 $264 $197 $1 $2,758

MORTGAGE BANKING

MORTGAGE BANKING	3 Months Ended
	Mar. 31, 2018
Mortgage Banking [Abstract]
MORTGAGE BANKING	MORTGAGE BANKING In its mortgage banking business, the Company sells residential mortgages to government-sponsored entities and other parties, who may issue securities backed by pools of such loans. The Company retains no beneficial interests in these sales, but may retain the servicing rights for the loans sold. The Company is obligated to subsequently repurchase a loan if the purchaser discovers a standard representation or warranty violation such as noncompliance with eligibility requirements, customer fraud, or servicing violations. This primarily occurs during a loan file review. Information related to residential mortgage loan sales and the Company's mortgage banking activity is presented below: Three Months Ended March 31, (in millions) 2018 2017 Residential mortgage loan sale proceeds $655 $815 Gain on sales 13 10 Mortgage servicing fees 15 13 Repurchased residential mortgages 2 1 Valuation recoveries 3 — MSRs are presented in other assets on the Consolidated Balance Sheets. Changes related to MSRs are presented below: As of and for the Three Months Ended March 31, (in millions) 2018 2017 MSRs: Balance as of beginning of period $201 $168 Amount capitalized 8 10 Amortization (8 ) (8 ) Carrying amount before valuation allowance 201 170 Valuation allowance for servicing assets: Balance as of beginning of period 3 5 Valuation recoveries (3 ) — Balance at end of period — 5 Net carrying value of MSRs $201 $165 The fair value of MSRs is estimated using a valuation model that calculates the present value of estimated future net servicing cash flows, taking into consideration actual and expected mortgage loan prepayment rates, discount rates, contractual servicing fee income, servicing costs, default rates, ancillary income, and other economic factors, which are determined based on current market conditions. The valuation model uses a static discounted cash flow methodology incorporating current market interest rates. A static model does not attempt to forecast or predict the future direction of interest rates; rather it estimates the amount and timing of future servicing cash flows using current market interest rates. The current mortgage interest rate influences the expected prepayment rate and therefore, the length of the cash flows associated with the servicing asset, while the discount rate determines the present value of those cash flows. Expected mortgage loan prepayment assumptions are obtained using the QRM Multi Component prepayment model. The Company periodically obtains third-party valuations of its MSRs to assess the reasonableness of the fair value calculated by the valuation model. The key economic assumptions used to estimate the value of MSRs are presented in the following table: March 31, 2018 December 31, 2017 Weighted Average Weighted Average (dollars in millions) Range Range Fair value $246 Min Max $218 Min Max Weighted average life (in years) 6.7 2.4 9.3 5.9 2.3 8.4 Weighted average constant prepayment rate 8.6% 5.2% 20.3% 10.0% 6.6% 20.1% Weighted average discount rate 9.9% 9.1% 12.1% 9.9% 9.1% 12.1% The key economic assumptions used in estimating the fair value of MSRs capitalized during the period are presented below: Three Months Ended March 31, 2018 2017 Weighted average life (in years) 7.9 6.9 Weighted average constant prepayment rate 7.3% 8.7% Weighted average discount rate 9.8% 9.9% The sensitivity analysis below presents the impact to current fair value of an immediate 50 basis point and 100 basis point adverse change in the key economic assumptions and presents the decline in fair value that would occur if the adverse change were realized. These sensitivities are hypothetical, with the effect of a variation in a particular assumption on the fair value of the mortgage servicing rights calculated independently without changing any other assumption. In reality, changes in one factor may result in changes in another (e.g., changes in interest rates, which drive changes in prepayment rates, could result in changes in the discount rates), which may amplify or counteract the sensitivities. The primary risk inherent in the Company’s MSRs is an increase in prepayments of the underlying mortgage loans serviced, which is dependent upon market movements of interest rates. (in millions) March 31, 2018 December 31, 2017 Prepayment rate: Decline in fair value from a 50 basis point decrease in interest rates $16 $22 Decline in fair value from a 100 basis point decrease in interest rates 48 46 Weighted average discount rate: Decline in fair value from a 50 basis point increase in weighted average discount rate $5 $4 Decline in fair value from a 100 basis point increase in weighted average discount rate 9 8

VARIABLE INTEREST ENTITIES

VARIABLE INTEREST ENTITIES	3 Months Ended
	Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
VARIABLE INTEREST ENTITIES	VARIABLE INTEREST ENTITIES The Company makes equity investments in various entities that are considered VIEs. These investments primarily include ownership interests in limited partnerships that sponsor affordable housing projects and ownership interests in limited liability companies that sponsor renewable energy projects. The Company’s maximum exposure to loss as a result of its involvement with these entities is limited to the balance sheet carrying amounts of its equity investments. A summary of these investments is presented below: (in millions) March 31, 2018 December 31, 2017 LIHTC investment included in other assets $993 $951 LIHTC unfunded commitments included in other liabilities 521 491 Renewable energy investments included in other assets 331 335 Low Income Housing Tax Credit Partnerships The purpose of the Company’s equity investments is to assist in achieving goals of the Community Reinvestment Act and to earn an adequate return of capital. LIHTC partnerships are managed by unrelated general partners that have the power to direct the activities which most significantly affect the performance of the partnerships. The Company is therefore not the primary beneficiary of any LIHTC partnerships. Accordingly, the Company does not consolidate these VIEs and accounts for these investments in other assets on the Consolidated Balance Sheets. The Company applies the proportional amortization method to account for its LIHTC investments. Under the proportional amortization method, the Company applies a practical expedient and amortizes the initial cost of the investment in proportion to the tax credits received in the current period as compared to the total tax credits expected to be received over the life of the investment. The amortization and tax benefits are included as a component of income tax expense. The tax credits received are reported as a reduction of income tax expense (or increase to income tax benefit) related to these transactions. The following table presents other information related to the Company’s affordable housing tax credit investments: Three Months Ended March 31, (in millions) 2018 2017 Tax credits included in income tax expense $25 $21 Amortization expense included in income tax expense 27 23 Other tax benefits included in income tax expense 6 7 No LIHTC investment impairment losses were recognized during the three months ended March 31, 2018 and 2017 , respectively. Renewable Energy Entities The Company’s investments in renewable energy entities provide benefits from a return generated by government incentives plus other tax attributes that are associated with tax ownership (e.g., tax depreciation). As a tax equity investor, the Company does not have the power to direct the activities which most significantly affect the performance of these entities and therefore is not the primary beneficiary of any renewable energy entities. Accordingly, the Company does not consolidate these VIEs and accounts for these investments in other assets on the Consolidated Balance Sheets.

BORROWED FUNDS

BORROWED FUNDS	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
BORROWED FUNDS	BORROWED FUNDS A summary of the Company’s short-term borrowed funds is presented below: (in millions) March 31, 2018 December 31, 2017 Federal funds purchased $— $460 Securities sold under agreements to repurchase 315 355 Other short-term borrowed funds (1) 1,494 1,856 Total short-term borrowed funds $1,809 $2,671 (1) March 31, 2018 includes $1.5 billion of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($2) million and other basis adjustments of ($14) million . December 31, 2017 includes $750 million of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($1) million and other basis adjustments of ($4) million . Key data related to short-term borrowed funds is presented in the following table: As of and for the Three Months Ended March 31, As of and for the Year Ended December 31, (dollars in millions) 2018 2017 2017 Weighted-average interest rate at period-end: (1) Federal funds purchased and securities sold under agreements to repurchase — % 0.43 % 0.74 % Other short-term borrowed funds 2.41 1.08 1.72 Maximum amount outstanding at month-end during the period: Federal funds purchased and securities sold under agreements to repurchase (2) $625 $1,174 $1,174 Other short-term borrowed funds 1,853 3,508 3,508 Average amount outstanding during the period: Federal funds purchased and securities sold under agreements to repurchase (2) $645 $882 $776 Other short-term borrowed funds 1,481 2,963 2,321 Weighted-average interest rate during the period: (1) Federal funds purchased and securities sold under agreements to repurchase 0.66 % 0.22 % 0.36 % Other short-term borrowed funds 2.14 1.08 1.32 (1) Rates exclude certain hedging costs. (2) Balances are net of certain short-term receivables associated with reverse repurchase agreements, as applicable. A summary of the Company’s long-term borrowed funds is presented below: (in millions) March 31, 2018 December 31, 2017 Parent Company: 2.375% fixed-rate senior unsecured debt, due 2021 $349 $349 4.150% fixed-rate subordinated debt, due 2022 348 348 5.158% fixed-to-floating rate subordinated debt, due 2023, converting to floating at 333 333 3.750% fixed-rate subordinated debt, due 2024 250 250 4.023% fixed-rate subordinated debt, due 2024 42 42 4.350% fixed-rate subordinated debt, due 2025 249 249 4.300% fixed-rate subordinated debt, due 2025 749 749 Banking Subsidiaries: 2.450% senior unsecured notes, due 2019 (1) 738 743 2.500% senior unsecured notes, due 2019 (1) (2) — 741 2.250% senior unsecured notes, due 2020 (1) 688 692 Floating-rate senior unsecured notes, due 2020 (1) 299 299 Floating-rate senior unsecured notes, due 2020 (1) 250 249 2.200% senior unsecured notes, due 2020 (1) 499 498 2.250% senior unsecured notes, due 2020 (1) 734 742 2.550% senior unsecured notes, due 2021 (1) 953 964 Floating-rate senior unsecured notes, due 2022 (1) 249 249 2.650% senior unsecured notes, due 2022 (1) 482 491 3.700% senior unsecured notes, due 2023 (1) 500 — Floating-rate senior unsecured notes, due 2023 (1) 249 — Federal Home Loan advances due through 2038 5,511 3,761 Other 14 16 Total long-term borrowed funds $13,486 $11,765 (1) Issued under CBNA’s Global Bank Note Program. (2) Reclassified to short-term borrowed funds. The Parent Company’s long-term borrowed funds as of March 31, 2018 and December 31, 2017 included principal balances of $2.3 billion and unamortized deferred issuance costs and/or discounts of ($5) million . The banking subsidiaries’ long-term borrowed funds as of March 31, 2018 and December 31, 2017 include principal balances of $11.3 billion and $9.5 billion , respectively, with unamortized deferred issuance costs and/or discounts of ($18) million and ($19) million , respectively, and hedging basis adjustments of ($91) million and ($63) million , respectively. See Note 8 “Derivatives” for further information about the Company’s hedging of certain long-term borrowed funds. Advances, lines of credit, and letters of credit from the FHLB are collateralized by pledged mortgages and pledged securities at least sufficient to satisfy the collateral maintenance level established by the FHLB. The utilized borrowing capacity for FHLB advances and letters of credit was $10.4 billion and $9.4 billion at March 31, 2018 and December 31, 2017 , respectively. The Company’s available FHLB borrowing capacity was $7.4 billion and $8.0 billion at March 31, 2018 and December 31, 2017 , respectively. The Company can also borrow from the FRB discount window to meet short-term liquidity requirements. Collateral, including certain loans, is pledged to support this borrowing capacity. At March 31, 2018 , the Company’s unused secured borrowing capacity was approximately $40.2 billion , which includes unencumbered securities, FHLB borrowing capacity, and FRB discount window capacity. A summary of maturities for the Company’s long-term borrowed funds at March 31, 2018 is presented below: (in millions) Parent Company Banking Subsidiaries Consolidated Year 2019 $— $6,244 $6,244 2020 — 2,473 2,473 2021 349 956 1,305 2022 348 736 1,084 2023 333 750 1,083 2024 and thereafter 1,290 7 1,297 Total $2,320 $11,166 $13,486

DERIVATIVES

DERIVATIVES	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	DERIVATIVES In the normal course of business, the Company enters into a variety of derivative transactions in order to meet the financing needs of its customers and to reduce its own exposure to fluctuations in interest rates and foreign currency exchange rates. These transactions include interest rate swap contracts, interest rate options, foreign exchange contracts, residential loan commitment rate locks, forward sale contracts and purchase options. The Company monitors the results of each transaction to ensure that management’s intent is satisfied. The Company does not use derivatives for speculative purposes. The Company’s derivative instruments are recognized on the Consolidated Balance Sheets at fair value. Information regarding the valuation methodology and inputs used to estimate the fair value of the Company’s derivative instruments is described in Note 12 “Fair Value Measurements.” The following table presents derivative instruments included on the Consolidated Balance Sheets in derivative assets and derivative liabilities: March 31, 2018 December 31, 2017 (in millions) Notional Amount (1) Derivative Assets Derivative Liabilities Notional Amount (1) Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate contracts $11,550 $— $— $13,300 $— $— Derivatives not designated as hedging instruments: Interest rate contracts 88,089 204 377 80,180 538 379 Foreign exchange contracts 9,525 158 150 9,882 148 149 Other contracts 1,142 7 5 1,039 7 5 Total derivatives not designated as hedging instruments 369 532 693 533 Gross derivative fair values 369 532 693 533 Less: Gross amounts offset in the Consolidated Balance Sheets (2) (83 ) (83 ) (72 ) (72 ) Less: Cash collateral applied (2) (12 ) (118 ) (4 ) (151 ) Total net derivative fair values presented in the Consolidated Balance Sheets $274 $331 $617 $310 (1) The notional or contractual amount of interest rate derivatives and foreign exchange contracts is the amount upon which interest and other payments under the contract are based. For interest rate contracts, the notional amount is typically not exchanged. Therefore, notional amounts should not be taken as the measure of credit or market risk, as they do not measure the true economic risk of these contracts. (2) Amounts represent the impact of enforceable master netting agreements that allow the Company to net settle positive and negative positions. The Company’s derivative transactions are internally divided into three sub-groups: institutional, customer and residential loan. The Company has certain derivative transactions which are designated as fair value or cash flow hedges, described as follows: Derivatives designated as hedging instruments The Company’s institutional derivatives portfolio qualifies for hedge accounting treatment. This includes interest rate swaps that are designated as highly effective fair value and cash flow hedging relationships. The Company formally documents at inception all hedging relationships, as well as risk management objectives and strategies for undertaking various accounting hedges. Additionally, the Company uses dollar offset or regression analysis at the hedge’s inception, and monthly thereafter, to assess whether the derivatives are expected to be, or have been, highly effective in offsetting changes in the hedged item’s expected cash flows. The Company discontinues hedge accounting treatment when it is determined that a derivative is not expected to be, or has ceased to be, effective as a hedge and then reflects changes in fair value in earnings after termination of the hedge relationship. Fair value hedges The Company has entered into interest rate swap agreements to manage the interest rate exposure on its medium-term borrowings. The change in value of fair value hedges, to the extent that the hedging relationship is effective, is recorded through other income and offset against the change in the fair value of the hedged item. The following table presents the effect on other income of fair value hedges described above: Amounts Recognized in Other Income for the Three Months Ended March 31, 2018 Three Months Ended March 31, 2017 (in millions) Derivative Hedged Item Hedge Ineffectiveness Derivative Hedged Item Hedge Ineffectiveness Hedges of interest rate risk on borrowings using interest rate swaps ($38 ) $37 ($1 ) ($6 ) $6 $— Cash flow hedges The Company has outstanding interest rate swap agreements designed to hedge a portion of the Company’s floating rate assets and financing liabilities (including its borrowed funds). All of these swaps have been deemed as highly effective cash flow hedges. The effective portion of the hedging gains and losses associated with these hedges are recorded in OCI; the ineffective portion of the hedging gains and losses is recorded in earnings (other income). Hedging gains and losses on derivative contracts reclassified from OCI to current period earnings are included in the line item in the accompanying Consolidated Statements of Operations in which the hedged item is recorded and in the same period that the hedged item affects earnings. During the next 12 months, there are $4 million in pre-tax net losses on derivative instruments included in OCI expected to be reclassified to net interest income in the Consolidated Statements of Operations. Hedging gains and losses associated with the Company’s cash flow hedges are immediately reclassified from OCI to current period earnings (other income) if it becomes probable that the hedged forecasted transactions will not occur during the originally specified time period. The following table presents the effect of cash flow hedges on net income and stockholders' equity: Amounts Recognized for the Three Months Ended March 31, (in millions) 2018 2017 Effective portion of loss recognized in OCI (1) ($70 ) ($5 ) Amounts reclassified from OCI to interest income (2) (6 ) 12 Amounts reclassified from OCI to interest expense (2) 4 (2 ) (1) The cumulative effective gains and losses on the Company’s cash flow hedging activities are included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets. (2) This amount includes both (a) the amortization of effective gains and losses associated with the Company’s terminated cash flow hedges and (b) the current reporting period’s interest settlements realized on the Company’s active cash flow hedges. Both (a) and (b) were previously included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets and were subsequently recorded as adjustments to the interest income or expense of the underlying hedged item. Derivatives not designated as hedging instruments Economic hedges The Company’s customer derivatives are recorded on the Consolidated Balance Sheets at fair value. These include interest rate and foreign exchange derivative contracts that are designed to meet the hedging and financing needs of the Company’s customers. Mark-to-market adjustments to the fair value of these contracts are included in foreign exchange and interest rate products on the Consolidated Statement of Operations. The mark-to-market gains and losses associated with the customer derivatives are mitigated by the mark-to-market gains and losses on the offsetting interest rate and foreign exchange derivative contracts transacted. The Company’s residential loan derivatives (including residential loan commitments and forward sales contracts) are recorded on the Consolidated Balance Sheets at fair value. Mark-to-market adjustments to the fair value of residential loan commitments and forward sale contracts are included in noninterest income under mortgage banking fees. The following table presents the effect of customer derivatives and economic hedges on noninterest income: Amounts Recognized in Noninterest Income for the Three Months Ended March 31, (in millions) 2018 2017 Customer derivative contracts Customer interest rate contracts (1) ($204 ) ($3 ) Customer foreign exchange contracts (1) 11 18 Residential loan commitments (2) (1 ) 5 Economic hedges Offsetting derivatives transactions to hedge interest rate risk on customer interest rate contracts (1) 216 15 Offsetting derivatives transactions to hedge foreign exchange risk on customer foreign exchange contracts (1) (17 ) (14 ) Forward sale contracts (2) — (11 ) Total $5 $10 (1) Reported in foreign exchange and interest rate products on the Consolidated Statements of Operations. (2) Reported in mortgage banking fees on the Consolidated Statements of Operations.

RECLASSIFICATIONS OUT OF ACCUMU

RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS The following table presents the changes in the balances, net of income taxes, of each component of AOCI: As of and for the Three Months Ended March 31, (in millions) Net Unrealized (Losses) Gains on Derivatives Net Unrealized (Losses) Gains on Debt Securities Employee Benefit Plans Total AOCI Balance at January 1, 2017 ($88 ) ($186 ) ($394 ) ($668 ) Other comprehensive (loss) income before reclassifications (3 ) 5 — 2 Other-than-temporary impairment not recognized in earnings on debt securities — (12 ) — (12 ) Amounts reclassified from other comprehensive (loss) income (6 ) (2 ) 3 (5 ) Net other comprehensive (loss) income (9 ) (9 ) 3 (15 ) Balance at March 31, 2017 ($97 ) ($195 ) ($391 ) ($683 ) Balance at January 1, 2018 ($143 ) ($236 ) ($441 ) ($820 ) Other comprehensive loss before reclassifications (52 ) (272 ) — (324 ) Other-than-temporary impairment not recognized in earnings on debt securities — (1 ) — (1 ) Amounts reclassified from other comprehensive income (loss) 2 (5 ) 3 — Net other comprehensive (loss) income (50 ) (278 ) 3 (325 ) Balance at March 31, 2018 ($193 ) ($514 ) ($438 ) ($1,145 ) The following table presents the amounts reclassified out of each component of AOCI and into the Consolidated Statements of Operations: Three Months Ended March 31, (in millions) 2018 2017 Details about AOCI Components Affected Line Item in the Consolidated Statements of Operations Reclassification adjustment for net derivative (losses) gains included in net income: ($6 ) $12 Interest income 4 (2 ) Interest expense (2 ) 10 Income before income tax expense — 4 Income tax expense ($2 ) $6 Net income Reclassification of net debt securities gains (losses) to net income: $8 $4 Securities gains, net (1 ) (1 ) Net debt securities impairment losses recognized in earnings 7 3 Income before income tax expense 2 1 Income tax expense $5 $2 Net income Reclassification of changes related to the employee benefit plan: ($4 ) ($5 ) Other operating expense (4 ) (5 ) Income before income tax expense (1 ) (2 ) Income tax expense ($3 ) ($3 ) Net income Total reclassification gains $— $5 Net income The following table presents the effects on net income of the amounts reclassified out of AOCI: Three Months Ended March 31, (in millions) 2018 2017 Net interest income (includes ($2) and $10 of AOCI reclassifications, respectively) $1,091 $1,005 Provision for credit losses 78 96 Noninterest income (includes $7 and $3 of AOCI reclassifications, respectively) 371 379 Noninterest expense (includes $4 and $5 of AOCI reclassifications, respectively) 883 854 Income before income tax expense 501 434 Income tax expense (includes $1 and $3 income tax net expense from reclassification items, respectively) 113 114 Net income $388 $320

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY Preferred Stock The Company had 100,000,000 shares authorized and 250,000 shares outstanding of $25.00 par value undesignated preferred stock as of March 31, 2018 and December 31, 2017 , respectively. For further detail regarding the terms and conditions of the Company’s preferred stock see Note 16 “Stockholders’ Equity” to the Company’s audited Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2017 . Treasury Stock During the three months ended March 31, 2018 , the Company repurchased $175 million , or 3,887,023 shares, of its outstanding common stock. The repurchased shares are held in treasury stock.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES A summary of outstanding off-balance sheet arrangements is presented below: (in millions) March 31, 2018 December 31, 2017 Undrawn commitments to extend credit $63,107 $62,959 Financial standby letters of credit 1,966 2,036 Performance letters of credit 109 47 Commercial letters of credit 43 53 Marketing rights 41 41 Risk participation agreements 18 16 Residential mortgage loans sold with recourse 6 7 Total $65,290 $65,159 Commitments to Extend Credit Commitments to extend credit are agreements to lend to customers in accordance with conditions contractually agreed upon in advance. Generally, the commitments have fixed expiration dates or termination clauses and may require payment of a fee. Since many of these commitments are expected to expire without being drawn upon, the contract amounts are not necessarily indicative of future cash requirements. Letters of Credit Standby letters of credit, both financial and performance, are issued by the Company for its customers. They are used as conditional guarantees of payment to a third party in the event the customer either fails to make specific payments (financial) or fails to complete a specific project (performance). Commercial letters of credit are used to facilitate the import of goods. The commercial letter of credit is used as the method of payment to the Company’s customers’ suppliers. The Company’s exposure to credit loss in the event of counterparty nonperformance in connection with the above instruments is represented by the contractual amount of those instruments, net of the value of collateral held. Standby letters of credit and commercial letters of credit are issued for terms of up to ten years and one year , respectively. Generally, letters of credit are collateralized by cash, accounts receivable, inventory or investment securities. Credit risk associated with letters of credit is considered in determining the appropriate amounts of reserves for unfunded commitments. The Company recognizes a liability on the Consolidated Balance Sheets representing its obligation to stand ready to perform over the term of the standby letters of credit in the event that the specified triggering events occur. The liability for these guarantees was $2 million and $3 million at March 31, 2018 and December 31, 2017 , respectively. Marketing Rights During 2003, the Company entered into a 25 -year agreement to acquire the naming and marketing rights of a baseball stadium in Pennsylvania. The Company did not make any payments for the three months ended March 31, 2018 and paid $3 million for the year ended December 31, 2017 . As of March 31, 2018, the Company is obligated to pay $41 million over the remainder of the contract. Risk Participation Agreements RPAs are guarantees issued by the Company to other parties for a fee, whereby the Company agrees to participate in the credit risk of a derivative customer of the other party. Under the terms of these agreements, the “participating bank” receives a fee from the “lead bank” in exchange for the guarantee of reimbursement if the customer defaults on an interest rate swap. The interest rate swap is transacted such that any and all exchanges of interest payments (favorable and unfavorable) are made between the lead bank and the customer. In the event that an early termination of the swap occurs and the customer is unable to make a required close out payment, the participating bank assumes that obligation and is required to make this payment. RPAs where the Company acts as the lead bank are referred to as “participations-out,” in reference to the credit risk associated with the customer derivatives being transferred out of the Company. Participations-out generally occur concurrently with the sale of new customer derivatives. RPAs where the Company acts as the participating bank are referred to as “participations-in,” in reference to the credit risk associated with the counterparty’s derivatives being assumed by the Company. The Company’s maximum credit exposure is based on its proportionate share of the settlement amount of the referenced interest rate swap. Settlement amounts are generally calculated based on the fair value of the swap plus outstanding accrued interest receivable from the customer. The Company’s estimate of the credit exposure associated with its risk participations-in as of March 31, 2018 and December 31, 2017 is $18 million and $16 million , respectively. The current amount of credit exposure is spread out over 88 counterparties. RPAs generally have terms ranging from one to five years; however, certain outstanding agreements have terms as long as eight years . Residential Loans Sold with Recourse The Company is an originator and servicer of residential mortgages and routinely sells such mortgage loans in the secondary market and to government-sponsored entities. In the context of such sales, the Company makes certain representations and warranties regarding the characteristics of the underlying loans and, as a result, may be contractually required to repurchase such loans or indemnify certain parties against losses for certain breaches of those representations and warranties. Other Commitments The Company’s commercial loan trading desk provides ongoing secondary market support and liquidity to its clients. Unsettled loan trades (i.e., loan purchase contracts) represent firm commitments to purchase loans from a third party at an agreed-upon price. Principal amounts associated with unsettled commercial loan trades are off-balance sheet commitments until delivery of the loans has taken place. Fair value adjustments associated with each unsettled loan trade are recognized on the Consolidated Balance Sheets and classified within other assets or other liabilities, depending on whether the fair value of the unsettled trade represents an unrealized gain or unrealized loss. The principal balances of unsettled commercial loan trade purchases and sales were $231 million and $283 million , respectively, at March 31, 2018 and $ 65 million and $132 million , respectively, at December 31, 2017 . Settled loans purchased by the trading desk are classified as loans held for sale, at fair value on the Consolidated Balance Sheets. Refer to Note 12 “Fair Value Measurements” for further information. Contingencies The Company operates in a legal and regulatory environment that exposes it to potentially significant risks. A certain amount of litigation ordinarily results from the nature of the Company’s banking and other businesses. The Company is a party to legal proceedings, including class actions. The Company is also the subject of investigations, reviews, subpoenas, and regulatory matters arising out of its normal business operations, which, in some instances, relate to concerns about fair lending, unfair and/or deceptive practices, mortgage-related issues, and mis-selling of certain products. In addition, the Company engages in discussions with relevant governmental and regulatory authorities on a regular and ongoing basis regarding various issues, and any issues discussed or identified may result in investigatory or other action being taken. Litigation and regulatory matters may result in settlements, damages, fines, penalties, public or private censure, increased costs, required remediation, restrictions on business activities, or other impacts on the Company. In these disputes and proceedings, the Company contests liability and the amount of damages as appropriate. Given their complex nature, and based on the Company's experience, it may be years before some of these matters are finally resolved. Moreover, before liability can be reasonably estimated for a claim, numerous legal and factual issues may need to be examined, including through potentially lengthy discovery and determination of important factual matters, and by addressing novel or unsettled legal issues relevant to the proceedings in question. The Company cannot predict with certainty if, how, or when such claims will be resolved or what the eventual settlement, fine, penalty or other relief, if any, may be, particularly for claims that are at an early stage in their development or where claimants seek substantial or indeterminate damages. The Company recognizes a provision for a claim when, in the opinion of management after seeking legal advice, it is probable that a liability exists and the amount of loss can be reasonably estimated. In many proceedings, however, it is not possible to determine whether any loss is probable or to estimate the amount of any loss. Based on information currently available, the advice of legal counsel and other advisers, and established reserves, management believes that the aggregate liabilities, if any, potentially arising from these proceedings will not have a materially adverse effect on the Company’s unaudited interim Consolidated Financial Statements. As previously reported, CBNA entered into a consent order with the OCC in November 2015 in connection with past billing practices. All financial penalties and remediation associated with this legacy matter have been paid and completed.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS As discussed in Note 19 “Fair Value Measurements,” to the Company’s audited Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2017, the Company measures or monitors many of its assets and liabilities on a fair value basis. Fair value is used on a recurring basis for assets and liabilities for which fair value is the required or elected measurement basis of accounting. Additionally, fair value is used on a nonrecurring basis to evaluate assets for impairment or for disclosure purposes. Nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write-downs of individual assets. The Company also applies the fair value measurement guidance to determine amounts reported for certain disclosures in this Note for assets and liabilities that are not required to be reported at fair value in the financial statements. The Company elected to account for residential mortgage loans held for sale and certain commercial and commercial real estate loans held for sale at fair value. Applying fair value accounting to the residential mortgage loans held for sale better aligns the reported results of the economic changes in the value of these loans and their related economic hedge instruments. Certain commercial and commercial real estate held for sale loans are managed by a commercial secondary loan desk that provides liquidity to banks, finance companies and institutional investors. Applying fair value accounting to this portfolio is appropriate because the Company holds these loans with the intent to sell within short term periods. Fair Value Option Residential Mortgage Loans Held for Sale The fair value of residential mortgage loans held for sale is derived from observable mortgage security prices and includes adjustments for loan servicing value, agency guarantee fees, and other loan level attributes which are mostly observable in the marketplace. Credit risk does not significantly impact the valuation since these loans are sold shortly after origination. Therefore, the Company classifies the residential mortgage loans held for sale in Level 2 of the fair value hierarchy. The election of the fair value option for financial assets and financial liabilities is optional and irrevocable. The loans accounted for under the fair value option are initially measured at fair value (i.e., acquisition cost) when the financial asset is acquired. Subsequent changes in fair value are recognized in mortgage banking fees on the Consolidated Statements of Operations. The Company recognized changes in fair value in mortgage banking income of ($3) million and $7 million for the three months ended March 31, 2018 and 2017 , respectively. Interest income on residential mortgage loans held for sale is calculated based on the contractual interest rate of the loan and is recorded in interest income. Commercial and Commercial Real Estate Loans Held for Sale The fair value of commercial and commercial real estate loans held for sale is estimated using observable prices of similar loans that transact in the marketplace. In addition, the Company uses external pricing services that provide estimates of fair values based on quotes from various dealers transacting in the market, sector curves or benchmarking techniques. Therefore, the Company classifies the commercial and commercial real estate loans managed by the commercial secondary loan desk in Level 2 of the fair value hierarchy given the observable market inputs. There were no loans in this portfolio that were 90 days or more past due or nonaccruing as of March 31, 2018 and December 31, 2017 . The loans accounted for under the fair value option are initially measured at fair value when the financial asset is recognized. Subsequent changes in fair value are recognized in other noninterest income on the Consolidated Statements of Operations. Since all loans in the Company’s commercial trading portfolio consist of floating rate obligations, all changes in fair value are due to changes in credit risk. Such credit-related fair value changes may include observed changes in overall credit spreads and/or changes to the creditworthiness of an individual borrower. Unsettled trades within the commercial trading portfolio are not recognized on the Consolidated Balance Sheets and represent off-balance sheet commitments. Refer to Note 11 “Commitments and Contingencies” for further information. Interest income on commercial and commercial real estate loans held for sale is calculated based on the contractual interest rate of the loan and is recorded in interest income. The Company recognized $1 million in other noninterest income related to its commercial trading portfolio for the three months ended March 31, 2018 and $2 million for the three months ended March 31, 2017 . The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans held for sale measured at fair value: March 31, 2018 December 31, 2017 (in millions) Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal Residential mortgage loans held for sale, at fair value $289 $289 $— $326 $326 $— Commercial and commercial real estate loans held for sale, at fair value 189 189 — 171 171 — Recurring Fair Value Measurements The Company utilizes a variety of valuation techniques to measure its assets and liabilities at fair value. The valuation methodologies used for significant assets and liabilities carried on the balance sheet at fair value on a recurring basis are presented below: Debt securities available for sale The fair value of debt securities classified as AFS is based upon quoted prices, if available. Where observable quoted prices are available in an active market, the security is classified as Level 1 in the fair value hierarchy. Classes of instruments that are valued using this market approach include debt securities issued by the U.S. Treasury. If quoted market prices are not available, the fair value for the security is estimated under the market or income approach using pricing models. These instruments are classified as Level 2 because they currently trade in active markets and the inputs to the valuations are observable. The pricing models used to value securities generally begin with market prices (or rates) for similar instruments and make adjustments based on the characteristics of the instrument being valued. These adjustments reflect assumptions made regarding the sensitivity of each security’s value to changes in interest rates and prepayment speeds. Classes of instruments that are valued using this market approach include specified pool mortgage “pass-through” securities and other debt securities issued by U.S. government-sponsored entities and state and political subdivisions. The pricing models used to value securities under the income approach generally begin with the contractual cash flows of each security and make adjustments based on forecasted prepayment speeds, default rates, and other market-observable information. The adjusted cash flows are then discounted at a rate derived from observed rates of return for comparable assets or liabilities that are traded in the market. Classes of instruments that are valued using this market approach include residential and commercial CMOs. A significant majority of the Company’s Level 1 and 2 debt securities are priced using an external pricing service. The Company verifies the accuracy of the pricing provided by its primary outside pricing service on a quarterly basis. This process involves using a secondary external vendor to provide valuations for the Company’s securities portfolio for comparison purposes. Any valuation discrepancies beyond a certain threshold are researched and, if necessary, corroborated by an independent outside broker. In certain cases where there is limited activity or less transparency around inputs to the valuation model, securities are classified as Level 3. Residential loans held for sale See the “Fair Value Option, Residential Mortgage Loans Held for Sale” discussion below. Commercial loans held for sale See the “Fair Value Option, Commercial and Commercial Real Estate Loans Held for Sale” discussion below. Derivatives The vast majority of the Company’s derivatives portfolio is composed of “plain vanilla” interest rate swaps, which are traded in over-the-counter markets where quoted market prices are not readily available. For these interest rate derivatives, fair value is determined utilizing models that primarily use market observable inputs, such as swap rates and yield curves. The pricing models used to value interest rate swaps calculate the sum of each instrument’s fixed and variable cash flows, which are then discounted using an appropriate yield curve (i.e., LIBOR or Overnight Index Swap curve) to arrive at the fair value of each swap. The pricing models do not contain a high level of subjectivity as the methodologies used do not require significant judgment. The Company also considers certain adjustments to the modeled price that market participants would make when pricing each instrument, including a credit valuation adjustment that reflects the credit quality of the swap counterparty. The Company incorporates the effect of exposure to a particular counterparty’s credit by netting its derivative contracts with the available collateral and calculating a credit valuation adjustment on the basis of the net position with the counterparty where permitted. The determination of this adjustment requires judgment on behalf of Company management; however, the total amount of this portfolio-level adjustment is not material to the total fair value of the interest rate swaps in their entirety . Therefore, interest rate swaps are classified as Level 2 in the valuation hierarchy. The Company’s other derivatives include foreign exchange contracts. The fair value of foreign exchange derivatives uses the mid-point of daily quoted currency spot prices. A valuation model estimates fair value based on the quoted spot rates together with interest rate yield curves and forward currency rates. Since all of these inputs are observable in the market, foreign exchange derivatives are classified as Level 2 in the fair value hierarchy. Money Market Mutual Fund Fair value is determined based upon unadjusted quoted market prices and is considered a Level 1 fair value measurement. Other equity securities The fair values of the Company’s other equity securities are based on security prices in markets that are not active; therefore, these investments are classified as Level 2 in the fair value hierarchy. The following table presents assets and liabilities measured at fair value, including gross derivative assets and liabilities on a recurring basis at March 31, 2018 : (in millions) Total Level 1 Level 2 Level 3 Debt securities available for sale: Mortgage-backed securities $19,940 $— $19,940 $— State and political subdivisions 6 — 6 — U.S. Treasury and other 12 12 — — Total debt securities available for sale 19,958 12 19,946 — Loans held for sale, at fair value: Residential loans held for sale 289 — 289 — Commercial loans held for sale 189 — 189 — Total loans held for sale, at fair value 478 — 478 — Derivative assets: Interest rate swaps 204 — 204 — Foreign exchange contracts 158 — 158 — Other contracts 7 — 7 — Total derivative assets 369 — 369 — Equity securities, at fair value: Money market mutual fund 168 168 — — Other investments 4 — 4 — Total equity securities, at fair value 172 168 4 — Total assets $20,977 $180 $20,797 $— Derivative liabilities: Interest rate swaps $377 $— $377 $— Foreign exchange contracts 150 — 150 — Other contracts 5 — 5 — Total derivative liabilities 532 — 532 — Total liabilities $532 $— $532 $— The following table presents assets and liabilities measured at fair value, including gross derivative assets and liabilities on a recurring basis at December 31, 2017 : (in millions) Total Level 1 Level 2 Level 3 Debt securities available for sale: Mortgage-backed securities $20,139 $— $20,139 $— State and political subdivisions 6 — 6 — U.S. Treasury and other 12 12 — — Total debt securities available for sale 20,157 12 20,145 — Loans held for sale, at fair value: Residential loans held for sale 326 — 326 — Commercial loans held for sale 171 — 171 — Total loans held for sale, at fair value 497 — 497 — Derivative assets: Interest rate swaps 538 — 538 — Foreign exchange contracts 148 — 148 — Other contracts 7 — 7 — Total derivative assets 693 — 693 — Equity securities, at fair value: Money market mutual fund 165 165 — — Other investments 4 — 4 — Total equity securities, at fair value 169 165 4 — Total assets $21,516 $177 $21,339 $— Derivative liabilities: Interest rate swaps $379 $— $379 $— Foreign exchange contracts 149 — 149 — Other contracts 5 — 5 — Total derivative liabilities 533 — 533 — Total liabilities $533 $— $533 $— There were no Level 3 assets measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 . Nonrecurring Fair Value Measurements Fair value is also used on a nonrecurring basis to evaluate certain assets for impairment or for disclosure purposes. Examples of nonrecurring uses of fair value include MSRs accounted for by the amortization method and loan impairments for certain loans and leases. The following valuation techniques are utilized to measure significant assets for which the Company utilizes fair value on a nonrecurring basis: Impaired Loans The carrying amount of collateral-dependent impaired loans is compared to the appraised value of the collateral less costs to dispose and is classified as Level 2. Any excess of carrying amount over the appraised value is charged to the ALLL. Mortgage Servicing Rights MSRs do not trade in an active market with readily observable prices. MSRs are classified as Level 3 since the valuation methodology utilizes significant unobservable inputs. The fair value was calculated using a discounted cash flow model which used assumptions, including weighted-average life, weighted-average constant prepayment rate and weighted-average discount rate. Refer to Note 8 “Mortgage Banking” to the Company’s audited Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2017 and Note 5 “Mortgage Banking” for more information. Foreclosed assets Foreclosed assets consist primarily of residential properties. Foreclosed assets are carried at the lower of cost or fair value less costs to sell. Fair value is based upon independent market prices or appraised values of the collateral and is classified as Level 2. Leased assets The fair value of assets under operating leases is determined using collateral specific pricing digests, external appraisals, broker opinions, recent sales data from industry equipment dealers, and discounted cash flows derived from the underlying lease agreement. As market data for similar assets and lease agreements is available and used in the valuation, these assets are classified as Level 2 fair value measurement. The following table presents gains (losses) on assets and liabilities measured at fair value on a nonrecurring basis and recorded in earnings: Three Months Ended March 31, (in millions) 2018 2017 Impaired collateral-dependent loans ($2 ) ($19 ) MSRs 3 — Foreclosed assets (1 ) (1 ) Leased assets — 4 The following table presents assets and liabilities measured at fair value on a nonrecurring basis: March 31, 2018 December 31, 2017 (in millions) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Impaired collateral-dependent loans $418 $— $418 $— $393 $— $393 $— MSRs 246 — — 246 218 — — 218 Foreclosed assets 29 — 29 — 31 — 31 — Leased assets 110 — 110 — 112 — 112 — Disclosures about Fair Value of Financial Instruments Following is a description of valuation methodologies used to estimate the fair value of financial instruments for disclosure purposes (these instruments are not recorded in the financial statements at fair value): Debt securities held to maturity The fair values of debt securities classified as HTM are estimated under the market or income approach using the same pricing models as those used to measure the fair value of the Company’s AFS securities. For more information, see “Recurring Fair Value Measurements — Debt securities Available for Sale,” within this Note. Equity securities, at cost The cost basis of equity securities, at cost, such as FHLB stock and FRB stock, is assumed to approximate the fair value of these securities. As a member of the FHLB and FRB, the Company is required to hold FHLB and FRB stock. The stock can be sold only to the FHLB and FRB upon termination of membership, or redeemed at the FHLB’s or FRB’s sole discretion. The stock may only be sold or redeemed at par, and therefore the cost basis represents the best estimate of fair value. Loans and leases For loans and leases not recorded at fair value on a recurring basis that are not accounted for as collateral-dependent impaired loans, fair value is estimated by using one of two methods: a discounted cash flow method or a securitization method. The discounted cash flow method involves discounting the expected future cash flows using current rates which a market participant would likely use to value similar pools of loans. Inputs used in this method include observable information such as contractual cash flows (net of servicing cost) and unobservable information such as estimated prepayment speeds, credit loss exposures, and discount rates. The securitization method involves utilizing market securitization data to value the assets as if a securitization transaction had been executed. Inputs used include observable market-based MBS data and pricing adjustments based on unobservable data reflecting the liquidity risk, credit loss exposure and other characteristics of the underlying loans. The internal risk-weighted balances of loans are grouped by product type for purposes of these estimated valuations. For nonaccruing loans, fair value is estimated by discounting management’s estimate of future cash flows with a discount rate commensurate with the risk associated with such assets. Fair value of collateral-dependent loans is primarily based on the appraised value of the collateral. Other loans held for sale Balances represent loans that were transferred to other loans held for sale and are reported at the lower of cost or fair value. When applicable, the fair value of other loans held for sale is estimated using one of two methods: a discounted cash flow method or a securitization method (as described above). Deposits The fair value of demand deposits, checking with interest accounts, regular savings, money market accounts and other deposits is the amount payable on demand at the balance sheet date. The fair value of term deposits is estimated by discounting the expected future cash flows using rates currently offered for deposits of similar remaining maturities. Federal funds purchased and securities sold under agreements to repurchase, other short-term borrowed funds, and long-term borrowed funds Rates currently available to the Company for debt of similar terms and remaining maturities are used to discount the expected cash flows of existing debt. The following table presents the estimated fair value for financial instruments not recorded at fair value in the unaudited interim Consolidated Financial Statements. The carrying amounts are recorded in the Consolidated Balance Sheets under the indicated captions: March 31, 2018 Total Level 1 Level 2 Level 3 (in millions) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Securities held to maturity $4,555 $4,439 $— $— $4,555 $4,439 $— $— Equity securities, at cost 748 748 — — 748 748 — — Other loans held for sale 322 322 — — — — 322 322 Loans and leases 111,425 110,756 — — 418 418 111,007 110,338 Financial Liabilities: Deposits 115,730 115,563 — — 115,730 115,563 — — Federal funds purchased and securities sold under agreements to repurchase 315 315 — — 315 315 — — Other short-term borrowed funds 1,494 1,494 — — 1,494 1,494 — — Long-term borrowed funds 13,486 13,525 — — 13,486 13,525 — — December 31, 2017 Total Level 1 Level 2 Level 3 (in millions) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Securities held to maturity $4,685 $4,668 $— $— $4,685 $4,668 $— $— Equity securities, at cost 722 722 — — 722 722 — — Other loans held for sale 221 221 — — — — 221 221 Loans and leases 110,617 111,168 — — 393 393 110,224 110,775 Financial Liabilities: Deposits 115,089 115,039 — — 115,089 115,039 — — Federal funds purchased and securities sold under agreements to repurchase 815 815 — — 815 815 — — Other short-term borrowed funds 1,856 1,856 — — 1,856 1,856 — — Long-term borrowed funds 11,765 11,891 — — 11,765 11,891 — —

NONINTEREST INCOME

NONINTEREST INCOME	3 Months Ended
	Mar. 31, 2018
Other Income and Expenses [Abstract]
NONINTEREST INCOME	NONINTEREST INCOME The following table presents noninterest income, segregated between revenue from contracts with customers and revenue from other sources: (in millions) Three Months Ended March 31, 2018 Revenue from contracts with customers $265 Revenue from other sources 106 Noninterest income $371 Revenues from Contracts with Customers The Company recognizes revenue from contracts with customers in the amount of consideration it expects to receive upon the transfer of control of a good or service. The timing of recognition is dependent on whether the Company satisfies a performance obligation by transferring control of the product or service to a customer over time or at a point in time. Judgments are made in the recognition of income including the timing of satisfaction of performance obligations and determination of the transaction price. The following table presents the components of revenue from contracts with customers disaggregated by revenue stream and business operating segment: Three Months Ended March 31, 2018 (in millions) Consumer Banking Commercial Banking Consolidated (1) Service charges and fees $98 $26 $124 Card fees 52 9 61 Capital markets fees — 37 37 Trust and investment services fees 40 — 40 Other banking fees — 3 3 Total revenue from contracts with customers $190 $75 $265 (1) There is no revenue from contracts with customers included in Other non-segment operations. A description of the above components of revenue from contracts with customers is presented below: Service Charges and Fees Service charges and fees include fees earned from deposit products in lieu of compensating balances, service charges for transactions performed upon depositors request, as well as fees earned from performing cash management activities. Service charges on deposit products are recognized over the period in which the related service is provided, typically monthly. Service fees are recognized at a point in time upon completion of the requested service transaction. Fees on cash management products are recognized over time (typically monthly) as services are provided. Card Fees Card fees include interchange income from credit and debit card transactions and are recognized at a point in time upon settlement by the association network. Interchange rates are generally set by the association network based on purchase volume and other factors. Other card-related fees are recognized at a point in time upon completion of the transaction. Costs related to card rewards programs are recognized in current earnings as the rewards are earned by the customer and are presented as a reduction to card fees on the Consolidated Statements of Operations. For the three months ended March 31, 2018 , card reward costs totaled $10 million . Capital Markets Fees Capital markets fees include fees received from leading or participating in loan syndications, underwriting services and advisory fees. Loan syndication and underwriting fees are recognized as revenue at a point in time when the Company has rendered all services to, and is entitled to collect the fee from the borrower or the issuer, and there are no other contingencies associated with the fee. Underwriting expenses passed through from the lead underwriter are recognized within other operating expense on the Consolidated Statements of Operations. Advisory fees for merger and acquisitions are recognized over time, while valuation services and fairness opinions are recognized at a point in time upon completion of the advisory service. Trust and Investment Services Fees Trust and investment services fees include fees from investment management services and brokerage services. Fees from investment management services are based on asset market values and are recognized over the period in which the related service is provided. Brokerage services include custody fees, commission income, trailing commissions and other investment securities. Custody fees are recognized on a monthly basis for customers that are assessed custody fees. Commission income is recognized at a point in time on trade date. Trailing commissions such as 12b-1 fees, insurance renewal income, and income based on asset or investment levels in future periods are recognized at a point in time when the asset balance is known, or the renewal occurs and the income is no longer constrained. For the three months ended March 31, 2018 , the Company recognized trailing commission income of $4 million related to services provided in previous reporting periods. Fees from other investment services are recognized at a point in time upon completion of the service. O ther Banking Fees Other banking fees include fees for various transactional banking activities such as letter of credit fees, foreign wire transfers and other transactional services. These fees are recognized in a manner that reflects the timing of when transactions occur and as services are provided. Revenue from Other Sources Letter of Credit and Loan Fees Letter of credit and loan fees primarily includes fees received related to letter of credit agreements as well as loan fees received from lending activities that are not deferrable. These fees are generally recognized upon execution of the contract. Foreign Exchange and Interest Rate Products Foreign exchange and interest rate products primarily includes the fees received from foreign exchange and interest rate derivative contracts executed with customers to meet their hedging and financing needs. These fees are generally recognized upon execution of the contracts. Foreign exchange and interest rate products also include the mark-to-market gains and losses recognized on (i) these customer contracts and (ii) offsetting derivative contracts that executed with external counterparties to hedge the foreign exchange and interest rate risk associated with the customer contracts. Mortgage Banking Fees Mortgage banking fees primarily include gains on sales of residential mortgages originated with the intent to sell and servicing fees on mortgages where the Company is the servicer. Mortgage banking fees also include valuation adjustments for mortgage loans held-for-sale that are measured at the lower of cost or fair value, as well as mortgage loans originated with the intent to sell that are measured at fair value under the fair value option. Changes in the value of MSRs are reported in mortgage fees and related income. For a further discussion of MSRs, see Note 5 “Mortgage Banking.” Net interest income from mortgage loans is recorded in interest income. Other Income Bank-owned life insurance is stated at its cash surrender value. The Company is the beneficiary of the life insurance policies on current and former officers and selected employees of the Company. Net changes in the carrying amount of the cash surrender value are an adjustment of premiums paid in determining the expense or income to be recognized under the life insurance policy for the period. Three Months Ended March 31, (in millions) 2018 2017 Bank-owned life insurance $14 $12

OTHER OPERATING EXPENSE

OTHER OPERATING EXPENSE	3 Months Ended
	Mar. 31, 2018
Other Income and Expenses [Abstract]
OTHER OPERATING EXPENSE	OTHER OPERATING EXPENSE The following table presents the details of other operating expense: Three Months Ended March 31, (in millions) 2018 2017 Deposit insurance $31 $32 Promotional expense 25 26 Settlements and operating losses 12 13 Other 52 53 Other operating expense $120 $124

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Income Tax Expense Income tax expense was $113 million and $114 million for the three months ended March 31, 2018 and 2017 , respectively, resulting in effective tax rates of 22.5% and 26.4% , respectively. For the three months ended March 31, 2018 , the effective tax rate of 22.5% was higher than the statutory rate of 21% primarily as a result of state taxes, partially offset by permanent benefits from tax credits and tax-exempt income. Deferred Tax Liability At March 31, 2018 , the Company reported a net deferred tax liability of $475 million , compared to $571 million as of December 31, 2017 . The decrease in the net deferred tax liability was primarily attributable to the tax effect of net unrealized losses on securities and derivatives.

EARNINGS PER SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Three Months Ended March 31, (in millions, except share and per-share data) 2018 2017 Numerator (basic and diluted): Net income $388 $320 Less: Preferred stock dividends 7 7 Net income available to common stockholders $381 $313 Denominator: Weighted-average common shares outstanding - basic 487,500,618 509,451,450 Dilutive common shares: share-based awards 1,766,208 1,896,750 Weighted-average common shares outstanding - diluted 489,266,826 511,348,200 Earnings per common share: Basic $0.78 $0.61 Diluted 0.78 0.61 Potential dilutive common shares are excluded from the computation of diluted EPS in the periods where the effect would be antidilutive. The diluted EPS computation for the three months ended March 31, 2018 did no t have any antidilutive shares. The diluted EPS computation for the three months ended March 31, 2017 excluded approximately 322,000 for the average share-based awards because their inclusion would have been antidilutive.

REGULATORY MATTERS

REGULATORY MATTERS	3 Months Ended
	Mar. 31, 2018
Banking and Thrift [Abstract]
REGULATORY MATTERS	REGULATORY MATTERS As a bank holding company, the Company is subject to regulation and supervision by the FRB. The primary subsidiaries of the Company are its two insured depository institutions CBNA, a national banking association whose primary federal regulator is the OCC, and CBPA, a Pennsylvania-chartered savings bank regulated by the Department of Banking of the Commonwealth of Pennsylvania and supervised by the FDIC, its primary federal regulator. Under the U.S. Basel III capital framework, the Company and its banking subsidiaries must meet specific minimum requirements for the following ratios: common equity tier 1 capital, tier 1 capital, total capital, and tier 1 leverage. In addition, the Company must not be subject to a written agreement, order or capital directive with any of its regulators. Failure to meet minimum capital requirements can result in the initiation of certain actions that, if undertaken, could have a material effect on the Company’s Consolidated Financial Statements. The following table presents the Company’s capital and capital ratios under U.S. Basel III Standardized rules. The Company has declared itself as an “AOCI opt-out” institution, which means the Company is not required to recognize in regulatory capital the impacts of net unrealized gains and losses included within AOCI for securities that are available for sale or held to maturity, accumulated net gains and losses on cash-flow hedges, and certain defined benefit pension plan assets. FDIA Requirements Actual Minimum Capital Adequacy Classification as Well-capitalized (6) (in millions, except ratio data) Amount Ratio Amount Ratio (5) Amount Ratio March 31, 2018 Common equity tier 1 capital (1) $14,425 11.2 % $8,228 6.375 % $8,389 6.5 % Tier 1 capital (2) 14,672 11.4 10,164 7.875 10,325 8.0 Total capital (3) 17,905 13.9 12,745 9.875 12,907 10.0 Tier 1 leverage (4) 14,672 10.0 5,858 4.000 7,322 5.0 December 31, 2017 Common equity tier 1 capital (1) $14,309 11.2 % $7,342 5.750 % $8,300 6.5 % Tier 1 capital (2) 14,556 11.4 9,258 7.250 10,215 8.0 Total capital (3) 17,781 13.9 11,812 9.250 12,769 10.0 Tier 1 leverage (4) 14,556 10.0 5,824 4.000 7,280 5.0 (1) “Common equity tier 1 capital ratio” represents CET1 capital divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach. (2) “Tier 1 capital ratio” is tier 1 capital, which includes CET1 capital plus non-cumulative perpetual preferred equity that qualifies as additional tier 1 capital, divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach. (3) “Total capital ratio” is total capital divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach. (4) “Tier 1 leverage ratio” is tier 1 capital divided by quarterly average total assets as defined under U.S. Basel III Standardized approach. (5) “Minimum Capital ratio” includes capital conservation buffer of 1.875% for 2018 and 1.250% for 2017 ; N/A to Tier 1 leverage. (6) Presented for informational purposes. Prompt corrective action provisions apply only to the Company’s insured depository institutions - CBNA and CBPA. Under the FRB’s Capital Plan Rule, the Company may only make capital distributions, including payment of dividends and share repurchases, in accordance with a capital plan that has been reviewed by the FRB with no objection. In accordance with federal and state banking regulations, dividends paid by the Company’s banking subsidiaries to the Parent Company are generally limited to the retained earnings of the respective banking subsidiaries unless specifically approved by the appropriate bank regulator. On April 5, 2018, the Company submitted its 2018 Capital Plan, Capital Policy and annual stress test results to the FRB as part of the 2018 CCAR process. All future capital distributions are also subject to consideration and approval by Board of Directors prior to execution. The timing and exact amount of future dividends and share repurchases will depend on various factors, including the Company’s capital position, financial performance and market conditions. During the three months ended March 31, 2018 and 2017 , the Company declared and paid dividends on common stock of $108 million and $72 million , respectively, and declared semi-annual preferred dividends of $7 million for both periods. During the three months ended March 31, 2018 and 2017 , the Parent Company repurchased $175 million and $130 million of its outstanding common stock, respectively.

BUSINESS OPERATING SEGMENTS

BUSINESS OPERATING SEGMENTS	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
BUSINESS OPERATING SEGMENTS	BUSINESS OPERATING SEGMENTS The Company is managed by its Chief Executive Officer on a segment basis. The Company’s two business segments are Consumer Banking and Commercial Banking. The business segments are determined based on the products and services provided, or the type of customer served. Each segment has one or more segment heads who report directly to the Chief Executive Officer. The Chief Executive Officer has final authority over resource allocation decisions and performance assessment. The business segments reflect this management structure and the manner in which financial information is currently evaluated by the Chief Executive Officer. Reportable Segments Segment results are determined based upon the Company’s management reporting system, which assigns balance sheet and statement of operations items to each of the business segments. The process is designed around the Company’s organizational and management structure and accordingly, the results derived are not necessarily comparable with similar information published by other financial institutions. A description of each reportable segment and table of financial results is presented below: Consumer Banking The Consumer Banking segment focuses on retail customers and small businesses with annual revenues of up to $25 million . It offers traditional banking products and services, including checking, savings, home loans, education loans, credit cards, business loans, and unsecured product finance and personal loans in addition to financial management services. It also operates an indirect auto financing business, providing financing for both new and used vehicles through auto dealerships. The segment’s distribution channels include a branch network, ATMs and a work force of experienced specialists ranging from financial consultants, mortgage loan officers and business banking officers to private bankers. The Company’s Consumer Banking value proposition is based on providing simple, easy to understand product offerings and a convenient banking experience with a more personalized approach. Commercial Banking The Commercial Banking segment primarily targets companies with annual revenues from $25 million to $2.5 billion and provides a full complement of financial products and solutions, including loans, leases, trade financing, deposits, cash management, commercial cards, foreign exchange, interest rate risk management, corporate finance and capital markets advisory capabilities. It focuses on middle-market companies, large corporations and institutions and has dedicated teams with industry expertise in government banking, not-for-profit, healthcare, technology, professionals, oil and gas, asset finance, franchise finance, asset-based lending, commercial real estate, private equity and sponsor finance. While the segment’s business development efforts are predominantly focused in the Company’s footprint, some of its specialized industry businesses also operate selectively on a national basis (such as healthcare, asset finance and franchise finance). A key component of Commercial Banking’s growth strategy is to bring ideas to clients that help their businesses thrive, and in doing so, expand the loan portfolio and ancillary product sales. Non-segment Operations Other Non-segment operations are classified as Other, which includes corporate functions, the Treasury function, the securities portfolio, wholesale funding activities, intangible assets, community development, non-core assets (including legacy Royal Bank of Scotland Group plc aircraft loans and leases placed in runoff in the third quarter of 2016), and other unallocated assets, liabilities, capital, revenues, provision for credit losses and expenses, including income tax expense. In addition to non-segment operations, Other includes goodwill and any associated goodwill impairment charges. For impairment testing purposes, the Company allocates goodwill to its Consumer Banking and Commercial Banking reporting units. For management reporting purposes, the Company presents the goodwill balance (and any related impairment charges) in Other. As of and for the Three Months Ended March 31, 2018 (in millions) Consumer Banking Commercial Banking Other Consolidated Net interest income $733 $357 $1 $1,091 Noninterest income 222 125 24 371 Total revenue 955 482 25 1,462 Noninterest expense 656 208 19 883 Profit before provision for credit losses 299 274 6 579 Provision for credit losses 72 (4 ) 10 78 Income (loss) before income tax expense (benefit) 227 278 (4 ) 501 Income tax expense (benefit) 57 63 (7 ) 113 Net income $170 $215 $3 $388 Total average assets $61,348 $50,393 $39,782 $151,523 As of and for the Three Months Ended March 31, 2017 (in millions) Consumer Banking Commercial Banking Other Consolidated Net interest income $638 $346 $21 $1,005 Noninterest income 220 134 25 379 Total revenue 858 480 46 1,384 Noninterest expense 647 190 17 854 Profit before provision for credit losses 211 290 29 530 Provision for credit losses 64 19 13 96 Income before income tax expense (benefit) 147 271 16 434 Income tax expense (benefit) 52 91 (29 ) 114 Net income $95 $180 $45 $320 Total average assets $58,660 $49,243 $40,883 $148,786 Management accounting practices utilized by the Company as the basis of presentation for segment results include the following: FTP adjustments The Company utilizes an FTP system to eliminate the effect of interest rate risk from the segments’ net interest income because such risk is centrally managed within the Treasury function. The FTP system credits (or charges) the segments with the economic value of the funds created (or used) by the segments. The FTP system provides a funds credit for sources of funds and a funds charge for the use of funds by each segment. The sum of the interest income/expense and FTP charges/credits for each segment is its designated net interest income. The variance between the Company’s cumulative FTP charges and cumulative FTP credits is offset in Other. The Company periodically evaluates and refines its methodologies used to measure financial performance of its business operating segments. In the first quarter of 2018, the Company enhanced its assumptions for the liquidity and deposit component within its FTP methodology. The enhancement largely provides increased credit for the stability of deposit composition, and an increased charge for unused commitments under lending arrangements. Prior periods have not been adjusted for this change. Provision for credit losses allocations Provision for credit losses is allocated to each business segment based on actual net charge-offs recognized by the business segment. The difference between the consolidated provision for credit losses and the business segments’ net charge-offs is reflected in Other. Income tax allocations Income taxes are assessed to each line of business at a standard tax rate with the residual tax expense or benefit to arrive at the consolidated effective tax rate included in Other. Expense allocations Noninterest expenses incurred by centrally managed operations or business lines that directly support another business line’s operations are charged to the applicable business line based on its utilization of those services. Substantially all revenues generated and long-lived assets held by the Company’s business segments are derived from clients that reside in the United States. Neither business segment earns revenue from a single external customer that represents ten percent or more of the Company’s total revenues.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS The Company has evaluated the impacts of events that have occurred subsequent to March 31, 2018 through the filing date of the unaudited interim Consolidated Financial Statements with the SEC. Based on this evaluation, the Company has determined none of these events were required to be recognized or disclosed in the unaudited interim Consolidated Financial Statements and related Notes.

BASIS OF PRESENTATION (Policies

BASIS OF PRESENTATION (Policies)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The unaudited interim Consolidated Financial Statements, including the Notes thereto of Citizens Financial Group, Inc., have been prepared in accordance with GAAP interim reporting requirements, and therefore do not include all information and Notes included in the audited Consolidated Financial Statements in conformity with GAAP. These unaudited interim Consolidated Financial Statements and Notes thereto should be read in conjunction with the Company’s audited Consolidated Financial Statements and accompanying Notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The Company’s principal business activity is banking, conducted through its subsidiaries, Citizens Bank, National Association and Citizens Bank of Pennsylvania.
Consolidation	The unaudited interim Consolidated Financial Statements include the accounts of the Company and subsidiaries in which the Company has a controlling financial interest. All intercompany transactions and balances have been eliminated. The Company has evaluated its unconsolidated entities and does not believe that any entity in which it has an interest, but does not currently consolidate, meets the requirements to be consolidated as a variable interest entity.
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for credit losses, evaluation of unrealized losses on securities for other-than-temporary impairment, accounting for income taxes, the valuation of AFS and HTM securities, and derivatives.
Adopted and Pending Accounting Pronouncements	Accounting Pronouncements Adopted in 2018 Pronouncement Summary of Guidance Effects on Financial Statements Revenue Recognition: Revenue from Contracts with Customers Issued May 2014 • Requires that revenue from contracts with customers be recognized upon transfer of control of a good or service in the amount of consideration expected to be received. • Changes the accounting for certain contract costs including whether they may be offset against revenues in the Consolidated Statements of Operations. • Requires new qualitative and quantitative disclosures, including information about disaggregation of revenue and performance obligations. • May be adopted using a full retrospective approach or a modified cumulative effect approach wherein the guidance is applied only to existing contracts as of the date of initial adoption and to new contracts transacted after that date. • The Company adopted the new standard on January 1, 2018 under the modified retrospective method. Net interest income on financial assets and liabilities is explicitly excluded from the scope of the pronouncement. • Adoption of the new standard did not result in a change in the timing or amount of revenue recognized from contracts with customers. The Company did not recognize a cumulative adjustment to Retained Earnings upon adoption. • Effective January 1, 2018, underwriting fees are presented on a gross basis in capital market fees, while underwriting costs are presented in other operating expense. Prior to adoption, such costs were presented net of the related underwriting fees. Stock Compensation Issued May 2017 • Requires modification accounting unless the fair value, vesting conditions, and classification of the modified award are the same as the original award immediately before the modification. • Applied prospectively to all modifications of share-based awards after the adoption date. • The Company adopted the new standard as of January 1, 2018. • Adoption did not have an impact on the Company’s Consolidated Financial Statements. Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost • Requires the service cost component of net periodic pension and postretirement benefit cost to be reported separately in the Consolidated Statements of Operations from the other components (e.g., expected return on assets, interest costs, amortization of gains/losses and prior service costs). • Requires presentation in the Consolidated Statements of Operations of the service cost component in the same line item as other employee compensation costs and presentation of the other components in a different line item from the service cost component. • Retrospective application is required for all periods presented. • The Company retrospectively adopted the new standard as of January 1, 2018. • Adoption did not have an impact on the Company’s net income. • The Company reclassified prior period amounts in the Consolidated Statement of Operations, which resulted in an immaterial increase in salaries and employee benefits and a corresponding decrease in other operating expense. Recognition and Measurement of Financial Assets and Financial Liabilities Issued January 2016 • Requires equity securities with readily determinable fair values to be measured at fair value on the balance sheet, with changes in the fair value recognized through earnings. • Requires separate presentation of financial assets and financial liabilities by measurement category and form of financial assets on the balance sheet or the notes to the financial statements. • Makes several other targeted amendments to the existing accounting and disclosure requirements for financial instruments, including revised guidance related to valuation allowance assessments when recognizing deferred tax assets on unrealized losses on debt securities available for sale. • The Company adopted the new standard as of January 1, 2018. • Adoption had an immaterial impact on the Company’s Consolidated Financial Statements. Classification of Certain Cash Receipts and Cash Payments Issued August 2016 • Amends current guidance on specific cashflows to determine the appropriate classification as operating, investing or financing activities which has required significant judgment. • The application of judgment has resulted in diversity in how certain cash receipts and cash payments are classified. • The Company adopted the new standard as of January 1, 2018. • Adoption did not have an impact on the Company’s Consolidated Financial Statements. Accounting Pronouncements Pending Adoption Pronouncement Summary of Guidance Effects on Financial Statements Derivatives and Hedging Issued August 2017 • Reduces the complexity and operational burdens of the current hedge accounting model and portrays more clearly the effects of hedge accounting in the financial statements. • Modifies current requirements to facilitate the application of hedge accounting to partial-term hedges, hedges of prepayable financial instruments, and other strategies. Adoption of these optional changes would occur on a prospective basis. • Requires the effects of fair value hedges to be classified in the same income statement line as the earnings effect of the hedged item. Adoption of this change will occur on a prospective basis. • Requires all effects of cash flow hedges to be deferred in other comprehensive income until the hedged cash flows affect earnings. Periodic hedge ineffectiveness will no longer be recognized in earnings. Adoption of this change will occur on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. • Required effective date: January 1, 2019. Early adoption is permitted. The Company is still evaluating whether or not it will adopt this guidance prior to the required effective date. • The transition entries required upon adoption are not expected to have a material impact on the Company’s Consolidated Financial Statements. Leases Issued February 2016 • Requires lessees to recognize a right-of-use asset and corresponding lease liability for all leases with a lease term of greater than one year. • Requires lessees and lessors to classify most leases using principles similar to existing lease accounting, but eliminates the “bright line” classification tests. • Requires that for finance leases, a lessee recognize interest expense on the lease liability separately from the amortization of the right-of-use asset in the Consolidated Statements of Operations, while for operating leases, such amounts should be recognized as a combined expense. • Requires expanded disclosures about the nature and terms of lease agreements. • Requires adoption using a modified cumulative effect approach wherein the guidance is applied to all periods presented. • Requires companies with land easements to assess whether the easement meets the definition of a lease before applying other accounting guidance. • Required effective date: January 1, 2019. Early adoption is permitted. The Company does not intend to adopt the guidance prior to the effective date. • The Company occupies certain banking offices and equipment under non-cancelable operating lease agreements, which currently are not reflected on its Consolidated Balance Sheets. • The Company expects to report increased assets and liabilities as a result of recognizing right-of-use assets and lease liabilities in its Consolidated Balance Sheets. As of December 31, 2017, the Company was committed to $842 million of minimum lease payments under non-cancelable operating lease agreements. • The evaluation of the impact of the leasing pronouncement will be adjusted based on execution of new leases, termination of existing leases prior to the effective date, and any changes to key lease assumptions such as renewals, extensions and discount rates. • The Company does not expect a material change to the timing of expense recognition on the Consolidated Statements of Operations. Financial Instruments - Credit Losses Issued June 2016 • Replaces existing incurred loss impairment guidance and establishes a single allowance framework for financial assets carried at amortized cost (including securities HTM), which will reflect management’s estimate of credit losses over the full remaining expected life of the financial assets. • Amends existing impairment guidance for securities AFS to incorporate an allowance, which will allow for reversals of impairment losses in the event that the credit of an issuer improves. • Requires a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. • Required effective date: January 1, 2020. Early adoption permitted on January 1, 2019. The Company does not intend to adopt the guidance prior to the effective date. • The Company established a company-wide, cross-discipline governance structure to implement the new standard. The Company is currently identifying and researching key interpretive issues and is in the process of developing models that meet the requirements of the new guidance. The implementation team is also in the process of assessing forecast accuracy and potential macroeconomic factors that will be used to determine the reasonable and supportable forecast period. • The Company expects the standard will result in earlier recognition of credit losses and an increase in the allowance for credit losses, as it will cover credit losses over the full remaining expected life of loans and commitments and will consider future reasonable and supportable changes in macroeconomic conditions. Since the magnitude of the increase in the Company’s allowance for credit losses will be impacted by economic conditions and trends in the Company’s portfolio at the time of adoption, the quantitative impact cannot yet be reasonably estimated.

SECURITIES (Tables)

SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of securities held	The following table presents the major components of securities at amortized cost and fair value: March 31, 2018 December 31, 2017 (in millions) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Available for Sale, At Fair Value U.S. Treasury and other $12 $— $— $12 $12 $— $— $12 State and political subdivisions 6 — — 6 6 — — 6 Mortgage-backed securities: Federal agencies and U.S. government sponsored entities 20,257 19 (622 ) 19,654 20,065 40 (277 ) 19,828 Other/non-agency 288 5 (7 ) 286 311 7 (7 ) 311 Total mortgage-backed securities 20,545 24 (629 ) 19,940 20,376 47 (284 ) 20,139 Total debt securities available for sale, at fair value $20,563 $24 ($629 ) $19,958 $20,394 $47 ($284 ) $20,157 Debt Securities Held to Maturity Mortgage-backed securities: Federal agencies and U.S. government sponsored entities $3,747 $— ($125 ) $3,622 $3,853 $7 ($46 ) $3,814 Other/non-agency 808 10 (1 ) 817 832 22 — 854 Total mortgage-backed securities 4,555 10 (126 ) 4,439 4,685 29 (46 ) 4,668 Total debt securities held to maturity $4,555 $10 ($126 ) $4,439 $4,685 $29 ($46 ) $4,668 Equity Securities, at Fair Value Money market mutual fund $168 $— $— $168 $165 $— $— $165 Other investments 4 — — 4 4 — — 4 Total equity securities, at fair value $172 $— $— $172 $169 $— $— $169 Equity Securities, at Cost Federal Reserve Bank stock $463 $— $— $463 $463 $— $— $463 Federal Home Loan Bank stock 278 — — 278 252 — — 252 Other equity securities 7 — — 7 7 — — 7 Total equity securities, at cost $748 $— $— $748 $722 $— $— $722
Schedule of investments classified by maturity date	The amortized cost and fair value of debt securities by contractual maturity as of March 31, 2018 are presented below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without incurring penalties. March 31, 2018 Distribution of Maturities (in millions) 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: Debt securities available for sale U.S. Treasury and other $12 $— $— $— $12 State and political subdivisions — — — 6 6 Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — 229 1,194 18,834 20,257 Other/non-agency 3 15 — 270 288 Total debt securities available for sale 15 244 1,194 19,110 20,563 Debt securities held to maturity Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — — — 3,747 3,747 Other/non-agency — — — 808 808 Total debt securities held to maturity — — — 4,555 4,555 Total amortized cost of debt securities $15 $244 $1,194 $23,665 $25,118 Fair Value: Debt securities available for sale U.S. Treasury and other $12 $— $— $— $12 State and political subdivisions — — — 6 6 Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — 227 1,174 18,253 19,654 Other/non-agency 3 15 — 268 286 Total debt securities available for sale 15 242 1,174 18,527 19,958 Debt securities held to maturity Mortgage-backed securities: Federal agencies and U.S. government sponsored entities — — — 3,622 3,622 Other/non-agency — — — 817 817 Total debt securities held to maturity — — — 4,439 4,439 Total fair value of debt securities $15 $242 $1,174 $22,966 $24,397
Schedule of income recognized on investment securities	Realized gains and losses on securities are presented below: Three Months Ended March 31, (in millions) 2018 2017 Gains on sale of debt securities $8 $4 Losses on sale of debt securities — — Debt securities gains, net $8 $4
Schedule of financial instruments owned and pledged as collateral	The amortized cost and fair value of debt securities pledged are presented below: March 31, 2018 December 31, 2017 (in millions) Amortized Cost Fair Value Amortized Cost Fair Value Pledged against repurchase agreements $325 $316 $358 $357 Pledged against FHLB borrowed funds 814 822 839 861 Pledged against derivatives, to qualify for fiduciary powers, and to secure public and other deposits as required by law 3,118 3,016 3,113 3,082
Schedule of unrealized loss on investments	The following tables present mortgage-backed debt securities whose fair values are below carrying values, segregated by those that have been in a continuous unrealized loss position for less than twelve months and those that have been in a continuous unrealized loss position for twelve months or longer: March 31, 2018 Less than 12 Months 12 Months or Longer Total (dollars in millions) Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Federal agencies and U.S. government sponsored entities 414 $14,541 ($352 ) 154 $7,624 ($395 ) 568 $22,165 ($747 ) Other/non-agency 9 154 (3 ) 10 80 (5 ) 19 234 (8 ) Total 423 $14,695 ($355 ) 164 $7,704 ($400 ) 587 $22,399 ($755 ) December 31, 2017 Less than 12 Months 12 Months or Longer Total (dollars in millions) Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Number of Issues Fair Value Gross Unrealized Losses Federal agencies and U.S. government sponsored entities 294 $10,163 ($97 ) 152 $8,061 ($226 ) 446 $18,224 ($323 ) Other/non-agency 6 55 (1 ) 10 84 (6 ) 16 139 (7 ) Total 300 $10,218 ($98 ) 162 $8,145 ($232 ) 462 $18,363 ($330 )
Schedule of credit losses recognized in earnings	The following table presents the cumulative credit-related losses recognized in earnings on debt securities held by the Company: Three Months Ended March 31, (in millions) 2018 2017 Cumulative balance at beginning of period $80 $75 Credit impairments recognized in earnings on debt securities that have been previously impaired 1 1 Reductions due to increases in cash flow expectations on impaired debt securities (1) (1 ) (1 ) Cumulative balance at end of period $80 $75 (1) Reported in interest income from investment securities on the Consolidated Statements of Operations.

LOANS AND LEASES (Tables)

LOANS AND LEASES (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Schedule of loans and leases	A summary of the loans and leases portfolio is presented below: (in millions) March 31, 2018 December 31, 2017 Commercial $38,277 $37,562 Commercial real estate 11,775 11,308 Leases 3,092 3,161 Total commercial loans and leases 53,144 52,031 Residential mortgages 17,346 17,045 Home equity loans 1,298 1,392 Home equity lines of credit 13,190 13,483 Home equity loans serviced by others 504 542 Home equity lines of credit serviced by others 136 149 Automobile 12,794 13,204 Education 8,324 8,134 Credit cards 1,808 1,848 Other retail 2,881 2,789 Total retail loans 58,281 58,586 Total loans and leases (1) (2) $111,425 $110,617 (1) Excluded from the table above are loans held for sale totaling $800 million and $718 million as of March 31, 2018 and December 31, 2017 , respectively. (2) Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $20.2 billion and $20.3 billion at March 31, 2018 and December 31, 2017 , respectively.
Schedule of loan purchases and sales	The following tables present balances of loan purchases and sales: Three Months Ended March 31, 2018 (in millions) Education Automobile Residential mortgages Home equity loans Commercial Total Purchases $— $— $— $— $200 $200 Sales — — — — — — Three Months Ended March 31, 2017 (in millions) Education Automobile Residential mortgages Home equity loans Commercial Total Purchases $325 $123 $— $— $— $448 Sales — — — — — —

ALLOWANCE FOR CREDIT LOSSES, 31

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Schedule of changes in the allowance for credit losses	A summary of changes in the allowance for credit losses is presented below: Three Months Ended March 31, 2018 (in millions) Commercial Retail Total Allowance for loan and lease losses, beginning of period $685 $551 $1,236 Charge-offs (3 ) (113 ) (116 ) Recoveries 6 40 46 Net recoveries (charge-offs) 3 (73 ) (70 ) Provision charged to income 23 57 80 Allowance for loan and lease losses, end of period 711 535 1,246 Reserve for unfunded lending commitments, beginning of period 88 — 88 Provision for unfunded lending commitments (2 ) — (2 ) Reserve for unfunded lending commitments, end of period 86 — 86 Total allowance for credit losses, end of period $797 $535 $1,332 Three Months Ended March 31, 2017 (in millions) Commercial Retail Total Allowance for loan and lease losses, beginning of period $663 $573 $1,236 Charge-offs (24 ) (109 ) (133 ) Recoveries 5 41 46 Net charge-offs (19 ) (68 ) (87 ) Provision charged to income 9 66 75 Allowance for loan and lease losses, end of period 653 571 1,224 Reserve for unfunded lending commitments, beginning of period 72 — 72 Provision for unfunded lending commitments 21 — 21 Reserve for unfunded lending commitments, end of period 93 — 93 Total allowance for credit losses, end of period $746 $571 $1,317
Schedule of loans and leases based on evaluation method	The recorded investment in loans and leases based on the Company’s evaluation methodology is presented below: March 31, 2018 December 31, 2017 (in millions) Commercial Retail Total Commercial Retail Total Individually evaluated $403 $748 $1,151 $370 $761 $1,131 Formula-based evaluation 52,741 57,533 110,274 51,661 57,825 109,486 Total $53,144 $58,281 $111,425 $52,031 $58,586 $110,617
Schedule of allowance for credit losses by evaluation method	A summary of the allowance for credit losses by evaluation method is presented below: March 31, 2018 December 31, 2017 (in millions) Commercial Retail Total Commercial Retail Total Individually evaluated $47 $28 $75 $47 $34 $81 Formula-based evaluation 750 507 1,257 726 517 1,243 Allowance for credit losses $797 $535 $1,332 $773 $551 $1,324
Schedule of classes of commercial loans and leases based on regulatory classifications	The recorded investment in commercial loans and leases based on regulatory classification ratings is presented below: March 31, 2018 Criticized (in millions) Pass Special Mention Substandard Doubtful Total Commercial $35,511 $1,644 $910 $212 $38,277 Commercial real estate 11,195 505 47 28 11,775 Leases 2,972 77 43 — 3,092 Total commercial loans and leases $49,678 $2,226 $1,000 $240 $53,144 December 31, 2017 Criticized (in millions) Pass Special Mention Substandard Doubtful Total Commercial $35,430 $1,143 $785 $204 $37,562 Commercial real estate 10,706 500 74 28 11,308 Leases 3,069 73 19 — 3,161 Total commercial loans and leases $49,205 $1,716 $878 $232 $52,031
Schedule of retail loan investments categorized by delinquency status	The recorded investment in classes of retail loans, categorized by delinquency status is presented below: March 31, 2018 Days Past Due (in millions) Current 1-29 30-59 60-89 90 or More Total Residential mortgages $17,092 $89 $35 $9 $121 $17,346 Home equity loans 1,144 87 12 5 50 1,298 Home equity lines of credit 12,575 343 55 19 198 13,190 Home equity loans serviced by others 449 25 10 1 19 504 Home equity lines of credit serviced by others 107 17 4 1 7 136 Automobile 11,540 994 173 37 50 12,794 Education 8,162 112 22 15 13 8,324 Credit cards 1,728 43 11 8 18 1,808 Other retail 2,777 61 21 11 11 2,881 Total $55,574 $1,771 $343 $106 $487 $58,281 December 31, 2017 Days Past Due (in millions) Current 1-29 30-59 60-89 90 or More Total Residential mortgages $16,714 $147 $46 $18 $120 $17,045 Home equity loans 1,212 102 20 4 54 1,392 Home equity lines of credit 12,756 438 78 23 188 13,483 Home equity loans serviced by others 477 29 10 4 22 542 Home equity lines of credit serviced by others 116 21 4 1 7 149 Automobile 11,596 1,273 220 55 60 13,204 Education 7,898 160 23 12 41 8,134 Credit cards 1,747 63 12 9 17 1,848 Other retail 2,679 68 20 12 10 2,789 Total retail loans $55,195 $2,301 $433 $138 $519 $58,586
Schedule of nonperforming loans and leases by class	The following table presents nonperforming loans and leases and loans accruing and 90 days or more past due: Nonperforming Accruing and 90 days or more past due (in millions) March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Commercial $244 $238 $1 $5 Commercial real estate 30 27 — 3 Leases — — 2 — Total commercial loans and leases 274 265 3 8 Residential mortgages (1) 128 128 14 16 Home equity loans 66 72 — — Home equity lines of credit 235 233 — — Home equity loans serviced by others 23 25 — — Home equity lines of credit serviced by others 17 18 — — Automobile 60 70 — — Education 41 38 3 3 Credit card 18 17 — — Other retail 6 5 6 5 Total retail loans 594 606 23 24 Total retail loans $868 $871 $26 $32 (1) Nonperforming balances exclude first lien residential mortgage loans that are 100% guaranteed by the Federal Housing Administration. These loans, which are accruing and 90 days or more past due, totaled $14 million and $15 million as of March 31, 2018 and December 31, 2017 , respectively. Nonperforming balances also exclude guaranteed residential mortgage loans sold to GNMA for which the Company has the right, but not the obligation, to repurchase. These loans totaled $24 million and $30 million as of March 31, 2018 and December 31, 2017 , respectively. These loans are included in the Company’s Consolidated Balance Sheets.
Summary of key performance indicators	A summary of nonperforming loan and lease key performance indicators is presented below: March 31, 2018 December 31, 2017 Nonperforming commercial loans and leases as a percentage of total loans and leases 0.25 % 0.24 % Nonperforming retail loans as a percentage of total loans and leases 0.53 0.55 Total nonperforming loans and leases as a percentage of total loans and leases 0.78 % 0.79 % Nonperforming commercial assets as a percentage of total assets 0.18 % 0.17 % Nonperforming retail assets as a percentage of total assets 0.41 % 0.43 % Total nonperforming assets as a percentage of total assets 0.59 % 0.60 %
Analysis of age of past due amounts	An analysis of the age of both accruing and nonaccruing loan and lease past due amounts is presented below: March 31, 2018 December 31, 2017 Days Past Due Days Past Due (in millions) 30-59 60-89 90 or More Total 30-59 60-89 90 or More Total Commercial $30 $23 $63 $116 $26 $4 $243 $273 Commercial real estate 42 1 28 71 38 20 30 88 Leases 3 — 2 5 4 1 — 5 Total commercial loans and leases 75 24 93 192 68 25 273 366 Residential mortgages 35 9 121 165 46 18 120 184 Home equity loans 12 5 50 67 20 4 54 78 Home equity lines of credit 55 19 198 272 78 23 188 289 Home equity loans serviced by others 10 1 19 30 10 4 22 36 Home equity lines of credit serviced by others 4 1 7 12 4 1 7 12 Automobile 173 37 50 260 220 55 60 335 Education 22 15 13 50 23 12 41 76 Credit cards 11 8 18 37 12 9 17 38 Other retail 21 11 11 43 20 12 10 42 Total retail loans 343 106 487 936 433 138 519 1,090 Total $418 $130 $580 $1,128 $501 $163 $792 $1,456
Schedule of impaired loans by class	A summary of impaired loans by class is presented below: March 31, 2018 (in millions) Impaired Loans With a Related Allowance Allowance on Impaired Loans Impaired Loans Without a Related Allowance Unpaid Contractual Balance Total Recorded Investment in Impaired Loans Commercial $211 $42 $167 $447 $378 Commercial real estate 25 5 — 40 25 Leases — — — — — Total commercial loans and leases 236 47 167 487 403 Residential mortgages 27 2 124 197 151 Home equity loans 38 3 78 156 116 Home equity lines of credit 16 1 182 242 198 Home equity loans serviced by others 28 2 22 65 50 Home equity lines of credit serviced by others 2 — 7 13 9 Automobile 2 — 22 30 24 Education 144 12 25 169 169 Credit cards 24 7 — 25 24 Other retail 4 1 3 9 7 Total retail loans 285 28 463 906 748 Total $521 $75 $630 $1,393 $1,151 December 31, 2017 (in millions) Impaired Loans With a Related Allowance Allowance on Impaired Loans Impaired Loans Without a Related Allowance Unpaid Contractual Balance Total Recorded Investment in Impaired Loans Commercial $183 $42 $159 $403 $342 Commercial real estate 25 5 3 40 28 Leases — — — — — Total commercial loans and leases 208 47 162 443 370 Residential mortgages 25 2 126 197 151 Home equity loans 41 4 80 162 121 Home equity lines of credit 16 1 181 241 197 Home equity loans serviced by others 29 2 22 67 51 Home equity lines of credit serviced by others 2 — 7 14 9 Automobile 2 — 21 30 23 Education 154 17 21 175 175 Credit cards 24 7 1 25 25 Other retail 5 1 4 10 9 Total retail loans 298 34 463 921 761 Total $506 $81 $625 $1,364 $1,131
Schedule of additional information on impaired loans	Additional information on impaired loans is presented below: Three Months Ended March 31, 2018 2017 (in millions) Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Commercial $2 $293 $1 $396 Commercial real estate — 27 — 45 Leases — — — — Total commercial loans and leases 2 320 1 441 Residential mortgages 1 149 1 176 Home equity loans 2 118 2 146 Home equity lines of credit 2 194 2 198 Home equity loans serviced by others 1 50 1 57 Home equity lines of credit serviced by others — 9 — 9 Automobile — 22 — 19 Education 2 171 2 152 Credit cards — 24 — 25 Other retail — 8 — 11 Total retail loans 8 745 8 793 Total $10 $1,065 $9 $1,234
Troubled debt restructurings on financing receivables	The table below summarizes TDRs by class and total unfunded commitments: (in millions) March 31, 2018 December 31, 2017 Commercial $202 $129 Retail 748 761 Unfunded commitments tied to TDRs 35 39 The table below summarizes how loans were modified during the three months ended March 31, 2018 , the charge-offs related to the modifications, and the impact on the ALLL. The reported balances can include loans that became TDRs during the three months ended March 31, 2018 and were paid off in full, charged off, or sold prior to March 31, 2018 . Primary Modification Types Interest Rate Reduction (1) Maturity Extension (2) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial 1 $— $— 6 $1 $1 Commercial real estate — — — 1 — — Leases — — — — — — Total commercial loans and leases 1 — — 7 1 1 Residential mortgages 7 1 1 7 1 1 Home equity loans 11 1 1 — — — Home equity lines of credit 15 1 1 42 5 5 Home equity loans serviced by others 1 — — — — — Home equity lines of credit serviced by others 2 — — — — — Automobile 36 1 1 17 1 1 Education — — — — — — Credit cards 594 3 3 — — — Other retail 1 — — — — — Total retail loans 667 7 7 66 7 7 Total 668 $7 $7 73 $8 $8 Primary Modification Types Other (3) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Net Change to ALLL Resulting from Modification Charge-offs Resulting from Modification Commercial 18 $74 $75 $— $— Commercial real estate — — — — — Leases — — — — — Total commercial loans and leases 18 74 75 — — Residential mortgages 53 6 6 — — Home equity loans 32 2 2 — — Home equity lines of credit 93 7 7 — — Home equity loans serviced by others 7 — — — — Home equity lines of credit serviced by others 3 — — — — Automobile 269 5 4 — 1 Education 112 1 1 — — Credit cards — — — — — Other retail 4 — — 1 — Total retail loans 573 21 20 1 1 Total 591 $95 $95 $1 $1 (1) Includes modifications that consist of multiple concessions, one of which is an interest rate reduction. (2) Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction). (3) Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forgiveness, and capitalizing arrearages. Also included are the following: deferrals, trial modifications, certain bankruptcies, loans in forbearance and prepayment plans. Modifications can include the deferral of accrued interest resulting in post modification balances being higher than pre-modification. The table below summarizes how loans were modified during the three months ended March 31, 2017 , the charge-offs related to the modifications, and the impact on the ALLL. The reported balances can include loans that became TDRs during the three months ended March 31, 2017 and were paid off in full, charged off, or sold prior to March 31, 2017 . Primary Modification Types Interest Rate Reduction (1) Maturity Extension (2) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Commercial 2 $1 $1 7 $1 $1 Commercial real estate — — — — — — Leases — — — — — — Total commercial loans and leases 2 1 1 7 1 1 Residential mortgages 18 1 2 11 3 3 Home equity loans 21 1 1 1 — — Home equity lines of credit 16 1 1 51 6 6 Home equity loans serviced by others 6 1 1 — — — Home equity lines of credit serviced by others 1 — — 2 — — Automobile 40 1 1 8 — — Education — — — — — — Credit cards 565 3 3 — — — Other retail 1 — — — — — Total retail loans 668 8 9 73 9 9 Total 670 $9 $10 80 $10 $10 Primary Modification Types Other (3) (dollars in millions) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Net Change to ALLL Resulting from Modification Charge-offs Resulting from Modification Commercial — $— $— $— $— Commercial real estate — — — — — Leases 1 1 1 — — Total commercial loans and leases 1 1 1 — — Residential mortgages 48 4 4 — — Home equity loans 102 6 6 — — Home equity lines of credit 75 6 6 — — Home equity loans serviced by others 14 1 1 — — Home equity lines of credit serviced by others 11 1 1 — — Automobile 276 5 4 — 1 Education 15 1 1 — — Credit cards — — — 1 — Other retail 1 — — — — Total retail loans 542 24 23 1 1 Total 543 $25 $24 $1 $1 (1) Includes modifications that consist of multiple concessions, one of which is an interest rate reduction. (2) Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction). (3) Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forgiveness, and capitalizing arrearages. Also included are the following: deferrals, trial modifications, certain bankruptcies, loans in forbearance and prepayment plans. Modifications can include the deferral of accrued interest resulting in post modification balances being higher than pre-modification.
Schedule of defaults	The table below summarizes TDRs that defaulted within 12 months of their modification date during the three months ended March 31, 2018 and 2017 , respectively. For purposes of this table, a payment default refers to a loan that becomes 90 days or more past due under the modified terms. Amounts represent the loan’s recorded investment at the time of payment default. If a TDR of any loan type becomes 90 days past due after being modified, the loan is written down to the fair value of collateral less cost to sell. The amount written off is charged to the ALLL. Three Months Ended March 31, 2018 2017 (dollars in millions) Number of Contracts Balance Defaulted Number of Contracts Balance Defaulted Commercial 3 $3 1 $— Commercial real estate — — 1 4 Leases — — — — Total commercial loans and leases 3 3 2 4 Residential mortgages 26 3 45 6 Home equity loans 11 1 9 — Home equity lines of credit 66 5 35 3 Home equity loans serviced by others 5 — 1 — Home equity lines of credit serviced by others 1 — 3 — Automobile 46 — 34 — Education 5 — 7 — Credit cards 119 1 126 1 Other retail — — 2 — Total retail loans 279 10 262 10 Total 282 $13 264 $14
Schedule of loans that may increase credit exposure	The following tables present balances of loans with these characteristics: March 31, 2018 (in millions) Residential Mortgages Home Equity Loans and Lines of Credit Home Equity Products Serviced by Others Credit Cards Education Total High loan-to-value $357 $160 $230 $— $— $747 Interest-only/negative amortization 1,765 — — — 1 1,766 Low introductory rate — — — 190 — 190 Multiple characteristics and other 1 — — — — 1 Total $2,123 $160 $230 $190 $1 $2,704 December 31, 2017 (in millions) Residential Mortgages Home Equity Loans and Lines of Credit Home Equity Products Serviced by Others Credit Cards Education Total High loan-to-value $366 $166 $264 $— $— $796 Interest-only/negative amortization 1,763 — — — 1 1,764 Low introductory rate — — — 197 — 197 Multiple characteristics and other 1 — — — — 1 Total $2,130 $166 $264 $197 $1 $2,758

MORTGAGE BANKING (Tables)

MORTGAGE BANKING (Tables)	3 Months Ended
	Mar. 31, 2018
Mortgage Banking [Abstract]
Schedule of mortgage banking activities	Information related to residential mortgage loan sales and the Company's mortgage banking activity is presented below: Three Months Ended March 31, (in millions) 2018 2017 Residential mortgage loan sale proceeds $655 $815 Gain on sales 13 10 Mortgage servicing fees 15 13 Repurchased residential mortgages 2 1 Valuation recoveries 3 —
Schedule of valuation allowance for impairment of recognized servicing assets	Changes related to MSRs are presented below: As of and for the Three Months Ended March 31, (in millions) 2018 2017 MSRs: Balance as of beginning of period $201 $168 Amount capitalized 8 10 Amortization (8 ) (8 ) Carrying amount before valuation allowance 201 170 Valuation allowance for servicing assets: Balance as of beginning of period 3 5 Valuation recoveries (3 ) — Balance at end of period — 5 Net carrying value of MSRs $201 $165
Servicing asset at amortized cost	Changes related to MSRs are presented below: As of and for the Three Months Ended March 31, (in millions) 2018 2017 MSRs: Balance as of beginning of period $201 $168 Amount capitalized 8 10 Amortization (8 ) (8 ) Carrying amount before valuation allowance 201 170 Valuation allowance for servicing assets: Balance as of beginning of period 3 5 Valuation recoveries (3 ) — Balance at end of period — 5 Net carrying value of MSRs $201 $165
Schedule of fair value assumptions used to estimate the value of Mortgage Servicing Rights	The key economic assumptions used to estimate the value of MSRs are presented in the following table: March 31, 2018 December 31, 2017 Weighted Average Weighted Average (dollars in millions) Range Range Fair value $246 Min Max $218 Min Max Weighted average life (in years) 6.7 2.4 9.3 5.9 2.3 8.4 Weighted average constant prepayment rate 8.6% 5.2% 20.3% 10.0% 6.6% 20.1% Weighted average discount rate 9.9% 9.1% 12.1% 9.9% 9.1% 12.1%
Schedule of fair value assumptions used to estimate the value of Mortgage Servicing Rights capitalized in current period	The key economic assumptions used in estimating the fair value of MSRs capitalized during the period are presented below: Three Months Ended March 31, 2018 2017 Weighted average life (in years) 7.9 6.9 Weighted average constant prepayment rate 7.3% 8.7% Weighted average discount rate 9.8% 9.9%
Schedule of the impact to fair value of an adverse change in key economic assumptions	The sensitivity analysis below presents the impact to current fair value of an immediate 50 basis point and 100 basis point adverse change in the key economic assumptions and presents the decline in fair value that would occur if the adverse change were realized. These sensitivities are hypothetical, with the effect of a variation in a particular assumption on the fair value of the mortgage servicing rights calculated independently without changing any other assumption. In reality, changes in one factor may result in changes in another (e.g., changes in interest rates, which drive changes in prepayment rates, could result in changes in the discount rates), which may amplify or counteract the sensitivities. The primary risk inherent in the Company’s MSRs is an increase in prepayments of the underlying mortgage loans serviced, which is dependent upon market movements of interest rates. (in millions) March 31, 2018 December 31, 2017 Prepayment rate: Decline in fair value from a 50 basis point decrease in interest rates $16 $22 Decline in fair value from a 100 basis point decrease in interest rates 48 46 Weighted average discount rate: Decline in fair value from a 50 basis point increase in weighted average discount rate $5 $4 Decline in fair value from a 100 basis point increase in weighted average discount rate 9 8

VARIABLE INTEREST ENTITIES (Tab

VARIABLE INTEREST ENTITIES (Tables)	3 Months Ended
	Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Schedule of variable interest entities	A summary of these investments is presented below: (in millions) March 31, 2018 December 31, 2017 LIHTC investment included in other assets $993 $951 LIHTC unfunded commitments included in other liabilities 521 491 Renewable energy investments included in other assets 331 335
Schedule of Affordable Housing Tax Credit investments	The following table presents other information related to the Company’s affordable housing tax credit investments: Three Months Ended March 31, (in millions) 2018 2017 Tax credits included in income tax expense $25 $21 Amortization expense included in income tax expense 27 23 Other tax benefits included in income tax expense 6 7

BORROWED FUNDS (Tables)

BORROWED FUNDS (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of short-term borrowed funds	A summary of the Company’s short-term borrowed funds is presented below: (in millions) March 31, 2018 December 31, 2017 Federal funds purchased $— $460 Securities sold under agreements to repurchase 315 355 Other short-term borrowed funds (1) 1,494 1,856 Total short-term borrowed funds $1,809 $2,671 (1) March 31, 2018 includes $1.5 billion of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($2) million and other basis adjustments of ($14) million . December 31, 2017 includes $750 million of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($1) million and other basis adjustments of ($4) million . Key data related to short-term borrowed funds is presented in the following table: As of and for the Three Months Ended March 31, As of and for the Year Ended December 31, (dollars in millions) 2018 2017 2017 Weighted-average interest rate at period-end: (1) Federal funds purchased and securities sold under agreements to repurchase — % 0.43 % 0.74 % Other short-term borrowed funds 2.41 1.08 1.72 Maximum amount outstanding at month-end during the period: Federal funds purchased and securities sold under agreements to repurchase (2) $625 $1,174 $1,174 Other short-term borrowed funds 1,853 3,508 3,508 Average amount outstanding during the period: Federal funds purchased and securities sold under agreements to repurchase (2) $645 $882 $776 Other short-term borrowed funds 1,481 2,963 2,321 Weighted-average interest rate during the period: (1) Federal funds purchased and securities sold under agreements to repurchase 0.66 % 0.22 % 0.36 % Other short-term borrowed funds 2.14 1.08 1.32 (1) Rates exclude certain hedging costs. (2) Balances are net of certain short-term receivables associated with reverse repurchase agreements, as applicable.
Schedule of long-term borrowed funds	A summary of the Company’s long-term borrowed funds is presented below: (in millions) March 31, 2018 December 31, 2017 Parent Company: 2.375% fixed-rate senior unsecured debt, due 2021 $349 $349 4.150% fixed-rate subordinated debt, due 2022 348 348 5.158% fixed-to-floating rate subordinated debt, due 2023, converting to floating at 333 333 3.750% fixed-rate subordinated debt, due 2024 250 250 4.023% fixed-rate subordinated debt, due 2024 42 42 4.350% fixed-rate subordinated debt, due 2025 249 249 4.300% fixed-rate subordinated debt, due 2025 749 749 Banking Subsidiaries: 2.450% senior unsecured notes, due 2019 (1) 738 743 2.500% senior unsecured notes, due 2019 (1) (2) — 741 2.250% senior unsecured notes, due 2020 (1) 688 692 Floating-rate senior unsecured notes, due 2020 (1) 299 299 Floating-rate senior unsecured notes, due 2020 (1) 250 249 2.200% senior unsecured notes, due 2020 (1) 499 498 2.250% senior unsecured notes, due 2020 (1) 734 742 2.550% senior unsecured notes, due 2021 (1) 953 964 Floating-rate senior unsecured notes, due 2022 (1) 249 249 2.650% senior unsecured notes, due 2022 (1) 482 491 3.700% senior unsecured notes, due 2023 (1) 500 — Floating-rate senior unsecured notes, due 2023 (1) 249 — Federal Home Loan advances due through 2038 5,511 3,761 Other 14 16 Total long-term borrowed funds $13,486 $11,765 (1) Issued under CBNA’s Global Bank Note Program. (2) Reclassified to short-term borrowed funds.
Schedule of maturities of long-term borrowed funds	A summary of maturities for the Company’s long-term borrowed funds at March 31, 2018 is presented below: (in millions) Parent Company Banking Subsidiaries Consolidated Year 2019 $— $6,244 $6,244 2020 — 2,473 2,473 2021 349 956 1,305 2022 348 736 1,084 2023 333 750 1,083 2024 and thereafter 1,290 7 1,297 Total $2,320 $11,166 $13,486

DERIVATIVES (Tables)

DERIVATIVES (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative instruments in consolidated balance sheets	The following table presents derivative instruments included on the Consolidated Balance Sheets in derivative assets and derivative liabilities: March 31, 2018 December 31, 2017 (in millions) Notional Amount (1) Derivative Assets Derivative Liabilities Notional Amount (1) Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Interest rate contracts $11,550 $— $— $13,300 $— $— Derivatives not designated as hedging instruments: Interest rate contracts 88,089 204 377 80,180 538 379 Foreign exchange contracts 9,525 158 150 9,882 148 149 Other contracts 1,142 7 5 1,039 7 5 Total derivatives not designated as hedging instruments 369 532 693 533 Gross derivative fair values 369 532 693 533 Less: Gross amounts offset in the Consolidated Balance Sheets (2) (83 ) (83 ) (72 ) (72 ) Less: Cash collateral applied (2) (12 ) (118 ) (4 ) (151 ) Total net derivative fair values presented in the Consolidated Balance Sheets $274 $331 $617 $310 (1) The notional or contractual amount of interest rate derivatives and foreign exchange contracts is the amount upon which interest and other payments under the contract are based. For interest rate contracts, the notional amount is typically not exchanged. Therefore, notional amounts should not be taken as the measure of credit or market risk, as they do not measure the true economic risk of these contracts. (2) Amounts represent the impact of enforceable master netting agreements that allow the Company to net settle positive and negative positions.
Schedule of fair value hedges	The following table presents the effect on other income of fair value hedges described above: Amounts Recognized in Other Income for the Three Months Ended March 31, 2018 Three Months Ended March 31, 2017 (in millions) Derivative Hedged Item Hedge Ineffectiveness Derivative Hedged Item Hedge Ineffectiveness Hedges of interest rate risk on borrowings using interest rate swaps ($38 ) $37 ($1 ) ($6 ) $6 $—
Schedule of effect of cash flow hedges on net income and stockholders' equity	The following table presents the effect of cash flow hedges on net income and stockholders' equity: Amounts Recognized for the Three Months Ended March 31, (in millions) 2018 2017 Effective portion of loss recognized in OCI (1) ($70 ) ($5 ) Amounts reclassified from OCI to interest income (2) (6 ) 12 Amounts reclassified from OCI to interest expense (2) 4 (2 ) (1) The cumulative effective gains and losses on the Company’s cash flow hedging activities are included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets. (2) This amount includes both (a) the amortization of effective gains and losses associated with the Company’s terminated cash flow hedges and (b) the current reporting period’s interest settlements realized on the Company’s active cash flow hedges. Both (a) and (b) were previously included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets and were subsequently recorded as adjustments to the interest income or expense of the underlying hedged item.
Schedule of effect of derivative Instruments on net income	The following table presents the effect of customer derivatives and economic hedges on noninterest income: Amounts Recognized in Noninterest Income for the Three Months Ended March 31, (in millions) 2018 2017 Customer derivative contracts Customer interest rate contracts (1) ($204 ) ($3 ) Customer foreign exchange contracts (1) 11 18 Residential loan commitments (2) (1 ) 5 Economic hedges Offsetting derivatives transactions to hedge interest rate risk on customer interest rate contracts (1) 216 15 Offsetting derivatives transactions to hedge foreign exchange risk on customer foreign exchange contracts (1) (17 ) (14 ) Forward sale contracts (2) — (11 ) Total $5 $10 (1) Reported in foreign exchange and interest rate products on the Consolidated Statements of Operations. (2) Reported in mortgage banking fees on the Consolidated Statements of Operations.

RECLASSIFICATIONS OUT OF ACCU36

RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of other comprehensive income	The following table presents the changes in the balances, net of income taxes, of each component of AOCI: As of and for the Three Months Ended March 31, (in millions) Net Unrealized (Losses) Gains on Derivatives Net Unrealized (Losses) Gains on Debt Securities Employee Benefit Plans Total AOCI Balance at January 1, 2017 ($88 ) ($186 ) ($394 ) ($668 ) Other comprehensive (loss) income before reclassifications (3 ) 5 — 2 Other-than-temporary impairment not recognized in earnings on debt securities — (12 ) — (12 ) Amounts reclassified from other comprehensive (loss) income (6 ) (2 ) 3 (5 ) Net other comprehensive (loss) income (9 ) (9 ) 3 (15 ) Balance at March 31, 2017 ($97 ) ($195 ) ($391 ) ($683 ) Balance at January 1, 2018 ($143 ) ($236 ) ($441 ) ($820 ) Other comprehensive loss before reclassifications (52 ) (272 ) — (324 ) Other-than-temporary impairment not recognized in earnings on debt securities — (1 ) — (1 ) Amounts reclassified from other comprehensive income (loss) 2 (5 ) 3 — Net other comprehensive (loss) income (50 ) (278 ) 3 (325 ) Balance at March 31, 2018 ($193 ) ($514 ) ($438 ) ($1,145 )
Schedule of reclassification out of accumulated other comprehensive income	The following table presents the amounts reclassified out of each component of AOCI and into the Consolidated Statements of Operations: Three Months Ended March 31, (in millions) 2018 2017 Details about AOCI Components Affected Line Item in the Consolidated Statements of Operations Reclassification adjustment for net derivative (losses) gains included in net income: ($6 ) $12 Interest income 4 (2 ) Interest expense (2 ) 10 Income before income tax expense — 4 Income tax expense ($2 ) $6 Net income Reclassification of net debt securities gains (losses) to net income: $8 $4 Securities gains, net (1 ) (1 ) Net debt securities impairment losses recognized in earnings 7 3 Income before income tax expense 2 1 Income tax expense $5 $2 Net income Reclassification of changes related to the employee benefit plan: ($4 ) ($5 ) Other operating expense (4 ) (5 ) Income before income tax expense (1 ) (2 ) Income tax expense ($3 ) ($3 ) Net income Total reclassification gains $— $5 Net income The following table presents the effects on net income of the amounts reclassified out of AOCI: Three Months Ended March 31, (in millions) 2018 2017 Net interest income (includes ($2) and $10 of AOCI reclassifications, respectively) $1,091 $1,005 Provision for credit losses 78 96 Noninterest income (includes $7 and $3 of AOCI reclassifications, respectively) 371 379 Noninterest expense (includes $4 and $5 of AOCI reclassifications, respectively) 883 854 Income before income tax expense 501 434 Income tax expense (includes $1 and $3 income tax net expense from reclassification items, respectively) 113 114 Net income $388 $320

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of outstanding off balance sheet arrangements	A summary of outstanding off-balance sheet arrangements is presented below: (in millions) March 31, 2018 December 31, 2017 Undrawn commitments to extend credit $63,107 $62,959 Financial standby letters of credit 1,966 2,036 Performance letters of credit 109 47 Commercial letters of credit 43 53 Marketing rights 41 41 Risk participation agreements 18 16 Residential mortgage loans sold with recourse 6 7 Total $65,290 $65,159

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Summary of difference between aggregated fair value and unpaid principal balance of loans held for sale	The following table presents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans held for sale measured at fair value: March 31, 2018 December 31, 2017 (in millions) Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal Aggregate Fair Value Aggregate Unpaid Principal Aggregate Fair Value Less Aggregate Unpaid Principal Residential mortgage loans held for sale, at fair value $289 $289 $— $326 $326 $— Commercial and commercial real estate loans held for sale, at fair value 189 189 — 171 171 —
Assets and liabilities measured on recurring basis	The following table presents assets and liabilities measured at fair value, including gross derivative assets and liabilities on a recurring basis at March 31, 2018 : (in millions) Total Level 1 Level 2 Level 3 Debt securities available for sale: Mortgage-backed securities $19,940 $— $19,940 $— State and political subdivisions 6 — 6 — U.S. Treasury and other 12 12 — — Total debt securities available for sale 19,958 12 19,946 — Loans held for sale, at fair value: Residential loans held for sale 289 — 289 — Commercial loans held for sale 189 — 189 — Total loans held for sale, at fair value 478 — 478 — Derivative assets: Interest rate swaps 204 — 204 — Foreign exchange contracts 158 — 158 — Other contracts 7 — 7 — Total derivative assets 369 — 369 — Equity securities, at fair value: Money market mutual fund 168 168 — — Other investments 4 — 4 — Total equity securities, at fair value 172 168 4 — Total assets $20,977 $180 $20,797 $— Derivative liabilities: Interest rate swaps $377 $— $377 $— Foreign exchange contracts 150 — 150 — Other contracts 5 — 5 — Total derivative liabilities 532 — 532 — Total liabilities $532 $— $532 $— The following table presents assets and liabilities measured at fair value, including gross derivative assets and liabilities on a recurring basis at December 31, 2017 : (in millions) Total Level 1 Level 2 Level 3 Debt securities available for sale: Mortgage-backed securities $20,139 $— $20,139 $— State and political subdivisions 6 — 6 — U.S. Treasury and other 12 12 — — Total debt securities available for sale 20,157 12 20,145 — Loans held for sale, at fair value: Residential loans held for sale 326 — 326 — Commercial loans held for sale 171 — 171 — Total loans held for sale, at fair value 497 — 497 — Derivative assets: Interest rate swaps 538 — 538 — Foreign exchange contracts 148 — 148 — Other contracts 7 — 7 — Total derivative assets 693 — 693 — Equity securities, at fair value: Money market mutual fund 165 165 — — Other investments 4 — 4 — Total equity securities, at fair value 169 165 4 — Total assets $21,516 $177 $21,339 $— Derivative liabilities: Interest rate swaps $379 $— $379 $— Foreign exchange contracts 149 — 149 — Other contracts 5 — 5 — Total derivative liabilities 533 — 533 — Total liabilities $533 $— $533 $—
Gains (losses) on assets and liabilities measured on a nonrecurring basis included in earnings	The following table presents gains (losses) on assets and liabilities measured at fair value on a nonrecurring basis and recorded in earnings: Three Months Ended March 31, (in millions) 2018 2017 Impaired collateral-dependent loans ($2 ) ($19 ) MSRs 3 — Foreclosed assets (1 ) (1 ) Leased assets — 4
Fair value of assets and liabilities measured on a nonrecurring basis	The following table presents assets and liabilities measured at fair value on a nonrecurring basis: March 31, 2018 December 31, 2017 (in millions) Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Impaired collateral-dependent loans $418 $— $418 $— $393 $— $393 $— MSRs 246 — — 246 218 — — 218 Foreclosed assets 29 — 29 — 31 — 31 — Leased assets 110 — 110 — 112 — 112 —
Assets and liabilities measured at fair value	The following table presents the estimated fair value for financial instruments not recorded at fair value in the unaudited interim Consolidated Financial Statements. The carrying amounts are recorded in the Consolidated Balance Sheets under the indicated captions: March 31, 2018 Total Level 1 Level 2 Level 3 (in millions) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Securities held to maturity $4,555 $4,439 $— $— $4,555 $4,439 $— $— Equity securities, at cost 748 748 — — 748 748 — — Other loans held for sale 322 322 — — — — 322 322 Loans and leases 111,425 110,756 — — 418 418 111,007 110,338 Financial Liabilities: Deposits 115,730 115,563 — — 115,730 115,563 — — Federal funds purchased and securities sold under agreements to repurchase 315 315 — — 315 315 — — Other short-term borrowed funds 1,494 1,494 — — 1,494 1,494 — — Long-term borrowed funds 13,486 13,525 — — 13,486 13,525 — — December 31, 2017 Total Level 1 Level 2 Level 3 (in millions) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Securities held to maturity $4,685 $4,668 $— $— $4,685 $4,668 $— $— Equity securities, at cost 722 722 — — 722 722 — — Other loans held for sale 221 221 — — — — 221 221 Loans and leases 110,617 111,168 — — 393 393 110,224 110,775 Financial Liabilities: Deposits 115,089 115,039 — — 115,089 115,039 — — Federal funds purchased and securities sold under agreements to repurchase 815 815 — — 815 815 — — Other short-term borrowed funds 1,856 1,856 — — 1,856 1,856 — — Long-term borrowed funds 11,765 11,891 — — 11,765 11,891 — —

NONINTEREST INCOME (Tables)

NONINTEREST INCOME (Tables)	3 Months Ended
	Mar. 31, 2018
Other Income and Expenses [Abstract]
Noninterest income	The following table presents noninterest income, segregated between revenue from contracts with customers and revenue from other sources: (in millions) Three Months Ended March 31, 2018 Revenue from contracts with customers $265 Revenue from other sources 106 Noninterest income $371
Components of revenue from contracts with customers	The following table presents the components of revenue from contracts with customers disaggregated by revenue stream and business operating segment: Three Months Ended March 31, 2018 (in millions) Consumer Banking Commercial Banking Consolidated (1) Service charges and fees $98 $26 $124 Card fees 52 9 61 Capital markets fees — 37 37 Trust and investment services fees 40 — 40 Other banking fees — 3 3 Total revenue from contracts with customers $190 $75 $265 (1) There is no revenue from contracts with customers included in Other non-segment operations.
Details of other income	Three Months Ended March 31, (in millions) 2018 2017 Bank-owned life insurance $14 $12

OTHER OPERATING EXPENSE (Tables

OTHER OPERATING EXPENSE (Tables)	3 Months Ended
	Mar. 31, 2018
Other Income and Expenses [Abstract]
Schedule of other operating expense	The following table presents the details of other operating expense: Three Months Ended March 31, (in millions) 2018 2017 Deposit insurance $31 $32 Promotional expense 25 26 Settlements and operating losses 12 13 Other 52 53 Other operating expense $120 $124

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of earnings per share	Three Months Ended March 31, (in millions, except share and per-share data) 2018 2017 Numerator (basic and diluted): Net income $388 $320 Less: Preferred stock dividends 7 7 Net income available to common stockholders $381 $313 Denominator: Weighted-average common shares outstanding - basic 487,500,618 509,451,450 Dilutive common shares: share-based awards 1,766,208 1,896,750 Weighted-average common shares outstanding - diluted 489,266,826 511,348,200 Earnings per common share: Basic $0.78 $0.61 Diluted 0.78 0.61

REGULATORY MATTERS (Tables)

REGULATORY MATTERS (Tables)	3 Months Ended
	Mar. 31, 2018
Banking and Thrift [Abstract]
Schedule of compliance with regulatory capital requirements under banking regulations	The following table presents the Company’s capital and capital ratios under U.S. Basel III Standardized rules. The Company has declared itself as an “AOCI opt-out” institution, which means the Company is not required to recognize in regulatory capital the impacts of net unrealized gains and losses included within AOCI for securities that are available for sale or held to maturity, accumulated net gains and losses on cash-flow hedges, and certain defined benefit pension plan assets. FDIA Requirements Actual Minimum Capital Adequacy Classification as Well-capitalized (6) (in millions, except ratio data) Amount Ratio Amount Ratio (5) Amount Ratio March 31, 2018 Common equity tier 1 capital (1) $14,425 11.2 % $8,228 6.375 % $8,389 6.5 % Tier 1 capital (2) 14,672 11.4 10,164 7.875 10,325 8.0 Total capital (3) 17,905 13.9 12,745 9.875 12,907 10.0 Tier 1 leverage (4) 14,672 10.0 5,858 4.000 7,322 5.0 December 31, 2017 Common equity tier 1 capital (1) $14,309 11.2 % $7,342 5.750 % $8,300 6.5 % Tier 1 capital (2) 14,556 11.4 9,258 7.250 10,215 8.0 Total capital (3) 17,781 13.9 11,812 9.250 12,769 10.0 Tier 1 leverage (4) 14,556 10.0 5,824 4.000 7,280 5.0 (1) “Common equity tier 1 capital ratio” represents CET1 capital divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach. (2) “Tier 1 capital ratio” is tier 1 capital, which includes CET1 capital plus non-cumulative perpetual preferred equity that qualifies as additional tier 1 capital, divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach. (3) “Total capital ratio” is total capital divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach. (4) “Tier 1 leverage ratio” is tier 1 capital divided by quarterly average total assets as defined under U.S. Basel III Standardized approach. (5) “Minimum Capital ratio” includes capital conservation buffer of 1.875% for 2018 and 1.250% for 2017 ; N/A to Tier 1 leverage. (6) Presented for informational purposes. Prompt corrective action provisions apply only to the Company’s insured depository institutions - CBNA and CBPA.

BUSINESS OPERATING SEGMENTS (Ta

BUSINESS OPERATING SEGMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of segment reporting information	As of and for the Three Months Ended March 31, 2018 (in millions) Consumer Banking Commercial Banking Other Consolidated Net interest income $733 $357 $1 $1,091 Noninterest income 222 125 24 371 Total revenue 955 482 25 1,462 Noninterest expense 656 208 19 883 Profit before provision for credit losses 299 274 6 579 Provision for credit losses 72 (4 ) 10 78 Income (loss) before income tax expense (benefit) 227 278 (4 ) 501 Income tax expense (benefit) 57 63 (7 ) 113 Net income $170 $215 $3 $388 Total average assets $61,348 $50,393 $39,782 $151,523 As of and for the Three Months Ended March 31, 2017 (in millions) Consumer Banking Commercial Banking Other Consolidated Net interest income $638 $346 $21 $1,005 Noninterest income 220 134 25 379 Total revenue 858 480 46 1,384 Noninterest expense 647 190 17 854 Profit before provision for credit losses 211 290 29 530 Provision for credit losses 64 19 13 96 Income before income tax expense (benefit) 147 271 16 434 Income tax expense (benefit) 52 91 (29 ) 114 Net income $95 $180 $45 $320 Total average assets $58,660 $49,243 $40,883 $148,786

BASIS OF PRESENTATION Operating

BASIS OF PRESENTATION Operating Leases (Details) $ in Millions	Dec. 31, 2017USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Minimum lease payments	$ 842

SECURITIES - Narrative (Details

SECURITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Taxable interest income from securities	$ 168	$ 160
Impaired debt securities sold	0	0
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securitizations of mortgage loans	26	22
Available-for-sale Securities
Schedule of Available-for-sale Securities [Line Items]
Cumulative credit losses recognized in earnings	80	75	$ 80	$ 75
OTTI in earnings	1	1
Held-to-maturity Securities
Schedule of Available-for-sale Securities [Line Items]
Cumulative credit losses recognized in earnings	$ 0	$ 0

SECURITIES - Schedule of Invest

SECURITIES - Schedule of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Securities Held-to-maturity, Amortized Cost	$ 4,555	$ 4,685
Securities Held-to-maturity, Gross Unrealized Gain	10	29
Securities Held-to-maturity, Gross Unrealized Losses	(126)	(46)
Securities held-to-maturity, Fair Value	4,439	4,668
Money market mutual fund, Amortized Cost	168	165
Money Market Mutual Fund, Gross Unrealized Gain	0	0
Money Market Mutual Fund, Gross Unrealized Loss	0	0
Money market mutual fund, Fair Value	168	165
Total other investment securities, at fair value, Amortized Cost	172	169
Total other investments securities, at fair value, at cost, Gross Unrealized Gains	0	0
Total other investments securities, at fair value, Gross Unrealized Losses	0	0
Total other investment securities, at fair value, Fair Value	172	169
Other Equity Securities, at Cost, Amortized Cost	7	7
Other Equity Securities, at Cost, Gross Unrealized Gain	0	0
Other Equity Securities, at Cost, Gross Unrealized Loss	0	0
Other Equity Securities, at Cost, Fair Value	7	7
Total equity securities, at cost	748	722
Total equity securities, at cost, Gross Unrealized Gain	0	0
Total equity securities, at cost, Gross Unrealized Losses	0	0
Total equity securities, at cost, Fair Value	748	722
U.S. Treasury and other
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost	12	12
Debt Securities Available-for-sale, Gross Unrealized Gains	0	0
Debt Securities Available-for-sale, Gross Unrealized Losses	0	0
Debt Securities Available-for-sale, Fair Value	12	12
State and political subdivisions
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost	6	6
Debt Securities Available-for-sale, Gross Unrealized Gains	0	0
Debt Securities Available-for-sale, Gross Unrealized Losses	0	0
Debt Securities Available-for-sale, Fair Value	6	6
Federal agencies and U.S. government sponsored entities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost	20,257	20,065
Debt Securities Available-for-sale, Gross Unrealized Gains	19	40
Debt Securities Available-for-sale, Gross Unrealized Losses	(622)	(277)
Debt Securities Available-for-sale, Fair Value	19,654	19,828
Securities Held-to-maturity, Amortized Cost	3,747	3,853
Securities Held-to-maturity, Gross Unrealized Gain	0	7
Securities Held-to-maturity, Gross Unrealized Losses	(125)	(46)
Securities held-to-maturity, Fair Value	3,622	3,814
Other/non-agency
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost	288	311
Debt Securities Available-for-sale, Gross Unrealized Gains	5	7
Debt Securities Available-for-sale, Gross Unrealized Losses	(7)	(7)
Debt Securities Available-for-sale, Fair Value	286	311
Securities Held-to-maturity, Amortized Cost	808	832
Securities Held-to-maturity, Gross Unrealized Gain	10	22
Securities Held-to-maturity, Gross Unrealized Losses	(1)	0
Securities held-to-maturity, Fair Value	817	854
Total mortgage-backed securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost	20,545	20,376
Debt Securities Available-for-sale, Gross Unrealized Gains	24	47
Debt Securities Available-for-sale, Gross Unrealized Losses	(629)	(284)
Debt Securities Available-for-sale, Fair Value	19,940	20,139
Securities Held-to-maturity, Amortized Cost	4,555	4,685
Securities Held-to-maturity, Gross Unrealized Gain	10	29
Securities Held-to-maturity, Gross Unrealized Losses	(126)	(46)
Securities held-to-maturity, Fair Value	4,439	4,668
Total debt securities available for sale, at fair value
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities Available-for-sale, Amortized Cost	20,563	20,394
Debt Securities Available-for-sale, Gross Unrealized Gains	24	47
Debt Securities Available-for-sale, Gross Unrealized Losses	(629)	(284)
Debt Securities Available-for-sale, Fair Value	19,958	20,157
Other investments
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Other Investments, Amortized Cost	4	4
Other Investments, Gross Unrealized Gain	0	0
Other Investments, Gross Unrealized Loss	0	0
Other Investments, Fair Value	4	4
Federal Reserve Bank stock
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Federal Reserve Bank stock, Amortized Cost	463	463
Federal Reserve Bank stock, Gross Unrealized Gains	0	0
Federal Reserve Bank stock, Gross Unrealized Losses	0	0
Federal Reserve Bank stock, Fair Value	463	463
Federal Home Loan Bank stock
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Federal Home Loan Bank stock, Amortized Cost	278	252
Federal Home Loan Bank stock, Gross Unrealized Gain	0	0
Federal Home Loan Bank stock, Gross Unrealized Losses	0	0
Federal Home Loan Bank stock, Fair Value	$ 278	$ 252

SECURITIES - Schedule of Availa

SECURITIES - Schedule of Available for Sale Securities Debt Maturities (Details) $ in Millions	Mar. 31, 2018USD ($)
Amortized Cost:
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less	$ 15
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years	244
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years	1,194
Amortized Cost, Debt securities available for sale, Maturity After 10 Years	19,110
Amortized Cost, Debt securities available for sale, Total	20,563
Amortized Cost, Debt securities held to maturity, Maturity of 1 Year or Less	0
Amortized Cost, Debt securities held to maturity, Maturity of 1-5 Years	0
Amortized Cost, Debt securities held to maturity, Maturity of 5-10 Years	0
Amortized Cost, Debt securities held to maturity, Maturity After 10 Years	4,555
Amortized Cost, Debt securities held to maturity, Total	4,555
Total amortized cost of debt securities, Maturity of 1 Year or Less	15
Total amortized cost of debt securities, Maturity of 1-5 Years	244
Total amortized cost of debt securities, Maturity of 5-10 Years	1,194
Total amortized cost of debt securities, Maturity After 10 Years	23,665
Total amortized cost of debt securities, Total	25,118
Fair Value:
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less	15
Fair Value, Debt securities available for sale, Maturity of 1-5 Years	242
Fair Value, Debt securities available for sale, Maturity of 5-10 Years	1,174
Fair Value, Debt securities available for sale, Maturity After 10 Years	18,527
Fair Value, Debt securities available for sale, Total	19,958
Fair Value, Debt securities held to maturity, Maturity of 1 Year or Less	0
Fair Value, Debt securities held to maturity, Maturity of 1-5 Years	0
Fair Value, Debt securities held to maturity, Maturity of 5-10 Years	0
Fair Value, Debt securities held to maturity, Maturity After 10 Years	4,439
Fair Value, Debt securities held to maturity, Total	4,439
Total fair value of debt securities, Maturity of 1 Year or Less	15
Total fair value of debt securities, Maturity of 1-5 Years	242
Total fair value of debt securities, Maturity of 5-10 Years	1,174
Total fair value of debt securities, Maturity After 10 Years	22,966
Total fair value of debt securities, Total	24,397
U.S. Treasury and other
Amortized Cost:
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less	12
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years	0
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years	0
Amortized Cost, Debt securities available for sale, Maturity After 10 Years	0
Amortized Cost, Debt securities available for sale, Total	12
Fair Value:
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less	12
Fair Value, Debt securities available for sale, Maturity of 1-5 Years	0
Fair Value, Debt securities available for sale, Maturity of 5-10 Years	0
Fair Value, Debt securities available for sale, Maturity After 10 Years	0
Fair Value, Debt securities available for sale, Total	12
State and political subdivisions
Amortized Cost:
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less	0
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years	0
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years	0
Amortized Cost, Debt securities available for sale, Maturity After 10 Years	6
Amortized Cost, Debt securities available for sale, Total	6
Fair Value:
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less	0
Fair Value, Debt securities available for sale, Maturity of 1-5 Years	0
Fair Value, Debt securities available for sale, Maturity of 5-10 Years	0
Fair Value, Debt securities available for sale, Maturity After 10 Years	6
Fair Value, Debt securities available for sale, Total	6
Federal agencies and U.S. government sponsored entities
Amortized Cost:
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less	0
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years	229
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years	1,194
Amortized Cost, Debt securities available for sale, Maturity After 10 Years	18,834
Amortized Cost, Debt securities available for sale, Total	20,257
Amortized Cost, Debt securities held to maturity, Maturity of 1 Year or Less	0
Amortized Cost, Debt securities held to maturity, Maturity of 1-5 Years	0
Amortized Cost, Debt securities held to maturity, Maturity of 5-10 Years	0
Amortized Cost, Debt securities held to maturity, Maturity After 10 Years	3,747
Amortized Cost, Debt securities held to maturity, Total	3,747
Fair Value:
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less	0
Fair Value, Debt securities available for sale, Maturity of 1-5 Years	227
Fair Value, Debt securities available for sale, Maturity of 5-10 Years	1,174
Fair Value, Debt securities available for sale, Maturity After 10 Years	18,253
Fair Value, Debt securities available for sale, Total	19,654
Fair Value, Debt securities held to maturity, Maturity of 1 Year or Less	0
Fair Value, Debt securities held to maturity, Maturity of 1-5 Years	0
Fair Value, Debt securities held to maturity, Maturity of 5-10 Years	0
Fair Value, Debt securities held to maturity, Maturity After 10 Years	3,622
Fair Value, Debt securities held to maturity, Total	3,622
Other/non-agency
Amortized Cost:
Amortized Cost, Debt securities available for sale, Maturity of 1 Year or Less	3
Amortized Cost, Debt securities available for sale, Maturity of 1-5 Years	15
Amortized Cost, Debt securities available for sale, Maturity of 5-10 Years	0
Amortized Cost, Debt securities available for sale, Maturity After 10 Years	270
Amortized Cost, Debt securities available for sale, Total	288
Amortized Cost, Debt securities held to maturity, Maturity of 1 Year or Less	0
Amortized Cost, Debt securities held to maturity, Maturity of 1-5 Years	0
Amortized Cost, Debt securities held to maturity, Maturity of 5-10 Years	0
Amortized Cost, Debt securities held to maturity, Maturity After 10 Years	808
Amortized Cost, Debt securities held to maturity, Total	808
Fair Value:
Fair Value, Debt securities available for sale, Maturity of 1 Year or Less	3
Fair Value, Debt securities available for sale, Maturity of 1-5 Years	15
Fair Value, Debt securities available for sale, Maturity of 5-10 Years	0
Fair Value, Debt securities available for sale, Maturity After 10 Years	268
Fair Value, Debt securities available for sale, Total	286
Fair Value, Debt securities held to maturity, Maturity of 1 Year or Less	0
Fair Value, Debt securities held to maturity, Maturity of 1-5 Years	0
Fair Value, Debt securities held to maturity, Maturity of 5-10 Years	0
Fair Value, Debt securities held to maturity, Maturity After 10 Years	817
Fair Value, Debt securities held to maturity, Total	$ 817

SECURITIES - Income Recognized

SECURITIES - Income Recognized from Investment Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Sale of Investments [Abstract]
Gains on sale of debt securities	$ 8	$ 4
Losses on sale of debt securities	0	0
Debt securities gains, net	$ 8	$ 4

SECURITIES - Schedule of Securi

SECURITIES - Schedule of Securities Pledged (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Pledged against repurchase agreements, Amortized Cost	$ 325	$ 358
Pledged against Federal Home Loan Bank borrowed funds, Amortized Cost	814	839
Pledged against derivatives to qualify for fiduciary powers, and to secure public and other deposits as required by law, Amortized Cost	3,118	3,113
Pledged against repurchase agreements, Fair Value	316	357
Pledged against Federal Home Loan Bank borrowed funds, Fair Value	822	861
Pledged against derivatives to qualify for fiduciary powers, and to secure public and other deposits as required by law, Fair Value	$ 3,016	$ 3,082

SECURITIES - Schedule of Inve50

SECURITIES - Schedule of Investments in Continuous Loss Positions (Details) $ in Millions	Mar. 31, 2018USD ($)Securities	Dec. 31, 2017USD ($)Securities
Number of Issues
Less than 12 Months | Securities	423	300
12 Months or Longer | Securities	164	162
Total | Securities	587	462
Fair Value
Less than 12 Months	$ 14,695	$ 10,218
12 Months or Longer	7,704	8,145
Total	22,399	18,363
Gross Unrealized Losses
Less than 12 Months	(355)	(98)
12 Months or Longer	(400)	(232)
Total	$ (755)	$ (330)
Federal agencies and U.S. government sponsored entities
Number of Issues
Less than 12 Months | Securities	414	294
12 Months or Longer | Securities	154	152
Total | Securities	568	446
Fair Value
Less than 12 Months	$ 14,541	$ 10,163
12 Months or Longer	7,624	8,061
Total	22,165	18,224
Gross Unrealized Losses
Less than 12 Months	(352)	(97)
12 Months or Longer	(395)	(226)
Total	$ (747)	$ (323)
Other/non-agency
Number of Issues
Less than 12 Months | Securities	9	6
12 Months or Longer | Securities	10	10
Total | Securities	19	16
Fair Value
Less than 12 Months	$ 154	$ 55
12 Months or Longer	80	84
Total	234	139
Gross Unrealized Losses
Less than 12 Months	(3)	(1)
12 Months or Longer	(5)	(6)
Total	$ (8)	$ (7)

SECURITIES - Schedule of Cumula

SECURITIES - Schedule of Cumulative Credit Losses Recognized in Earnings (Details) - Available-for-sale Securities - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Cumulative balance at beginning of period		$ 80	$ 75
Credit impairments recognized in earnings on debt securities that have been previously impaired		1	1
Reductions due to increases in cash flow expectations on impaired securities	[1]	(1)	(1)
Cumulative balance at end of period		$ 80	$ 75
[1]	Reported in interest income from investment securities on the Consolidated Statements of Operations.

LOANS AND LEASES - Narrative (D

LOANS AND LEASES - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 478	$ 497
Other loans held for sale	322	221
Level 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	478	497
Other loans held for sale	0	0
Level 2 | Residential loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	289	326
Level 2 | Commercial real estate loans held for sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	189	171
Retail | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral for FHLB borrowed funds	25,400	24,900
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window	$ 17,800	$ 18,100

LOANS AND LEASES - Summary of L

LOANS AND LEASES - Summary of Loans and Leases Portfolio (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	[1],[2]	$ 111,425	$ 110,617
Loans receivable held for sale		800	718
Mortgage loans serviced for others | Banking Subsidiaries
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		20,200	20,300
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		53,144	52,031
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		38,277	37,562
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		11,775	11,308
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		3,092	3,161
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		58,281	58,586
Retail | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		17,346	17,045
Retail | Home equity loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		1,298	1,392
Retail | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		13,190	13,483
Retail | Home equity loans serviced by others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		504	542
Retail | Home equity lines of credit serviced by others
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		136	149
Retail | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		12,794	13,204
Retail | Education
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		8,324	8,134
Retail | Credit cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		1,808	1,848
Retail | Other retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases		$ 2,881	$ 2,789
[1]	Excluded from the table above are loans held for sale totaling $800 million and $718 million as of March 31, 2018 and December 31, 2017, respectively.
[2]	Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $20.2 billion and $20.3 billion at March 31, 2018 and December 31, 2017, respectively.

LOANS AND LEASES - Purchases an

LOANS AND LEASES - Purchases and Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchases	$ 200	$ 448
Sales	0	0
Retail | Education
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchases	0	325
Sales	0	0
Retail | Automobile
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchases	0	123
Sales	0	0
Retail | Residential mortgages
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchases	0	0
Sales	0	0
Retail | Home equity loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchases	0	0
Sales	0	0
Commercial | Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Purchases	200	0
Sales	$ 0	$ 0

ALLOWANCE FOR CREDIT LOSSES, 55

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Provision charged to income	$ 78	$ 96
Nonperforming assets, net of valuation allowance	34		$ 36
Mortgage loans collateralized by OREO	184		181
Larger balance commercial loans minimum balance (greater than)	$ 3
High loan to value criteria (exceeds)	90.00%
Allowance for loan and lease losses
Financing Receivable, Modifications [Line Items]
Provision charged to income	$ 80	75
Allowance for loan and lease losses | Commercial
Financing Receivable, Modifications [Line Items]
Provision charged to income	23	9
Allowance for loan and lease losses | Retail
Financing Receivable, Modifications [Line Items]
Provision charged to income	$ 57	$ 66
Scenario, Adjustment | Allowance for loan and lease losses | Commercial
Financing Receivable, Modifications [Line Items]
Provision charged to income			$ 50

ALLOWANCE FOR CREDIT LOSSES, 56

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Changes in Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	$ 1,236
Provision charged to income	78	$ 96
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,246		$ 1,236
Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	1,236	1,236	1,236
Charge-offs	(116)	(133)
Recoveries	46	46
Net recoveries (charge-offs)	(70)	(87)
Provision charged to income	80	75
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,246	1,224	1,236
Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	88	72	72
Provision for unfunded lending commitments	(2)	21
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	86	93	88
Allowance for loan and lease losses and reserve for off-balance sheet activities, total
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	1,332	1,317
Commercial | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	685	663	663
Charge-offs	(3)	(24)
Recoveries	6	5
Net recoveries (charge-offs)	3	(19)
Provision charged to income	23	9
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	711	653	685
Commercial | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	88	72	72
Provision for unfunded lending commitments	(2)	21
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	86	93	88
Commercial | Allowance for loan and lease losses and reserve for off-balance sheet activities, total
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	797	746
Retail | Allowance for loan and lease losses
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	551	573	573
Charge-offs	(113)	(109)
Recoveries	40	41
Net recoveries (charge-offs)	(73)	(68)
Provision charged to income	57	66
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	535	571	551
Retail | Reserve for unfunded lending commitments
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance	0	0	0
Provision for unfunded lending commitments	0	0
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	0	0	$ 0
Retail | Allowance for loan and lease losses and reserve for off-balance sheet activities, total
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance	$ 535	$ 571

ALLOWANCE FOR CREDIT LOSSES, 57

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Loan and Leases (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Individually evaluated	$ 1,151	$ 1,131
Formula-based evaluation	110,274	109,486
Total	111,425	110,617
Commercial
Financing Receivable, Recorded Investment [Line Items]
Individually evaluated	403	370
Formula-based evaluation	52,741	51,661
Total	53,144	52,031
Retail
Financing Receivable, Recorded Investment [Line Items]
Individually evaluated	748	761
Formula-based evaluation	57,533	57,825
Total	$ 58,281	$ 58,586

ALLOWANCE FOR CREDIT LOSSES, 58

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Allowance for Credit Losses by Evaluation Method (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated	$ 75	$ 81
Formula-based evaluation	1,257	1,243
Allowance for credit losses	1,332	1,324
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated	47	47
Formula-based evaluation	750	726
Allowance for credit losses	797	773
Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated	28	34
Formula-based evaluation	507	517
Allowance for credit losses	$ 535	$ 551

ALLOWANCE FOR CREDIT LOSSES, 59

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Commercial Loans and Leases by Regulatory Classification Ratings (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 111,425	$ 110,617
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total	53,144	52,031
Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	49,678	49,205
Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	2,226	1,716
Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	1,000	878
Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	240	232
Commercial | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total	38,277	37,562
Commercial | Commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	35,511	35,430
Commercial | Commercial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	1,644	1,143
Commercial | Commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	910	785
Commercial | Commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	212	204
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total	11,775	11,308
Commercial | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	11,195	10,706
Commercial | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	505	500
Commercial | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	47	74
Commercial | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	28	28
Commercial | Leases
Financing Receivable, Recorded Investment [Line Items]
Total	3,092	3,161
Commercial | Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	2,972	3,069
Commercial | Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	77	73
Commercial | Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	43	19
Commercial | Leases | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0

ALLOWANCE FOR CREDIT LOSSES, 60

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Recorded Investment in Retail Loans by Delinquency Status (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 1,128	$ 1,456
Total	111,425	110,617
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	418	501
Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	130	163
Financing Receivables 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	580	792
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	55,574	55,195
Past Due	936	1,090
Total	58,281	58,586
Retail | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	17,092	16,714
Past Due	165	184
Total	17,346	17,045
Retail | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,144	1,212
Past Due	67	78
Total	1,298	1,392
Retail | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	12,575	12,756
Past Due	272	289
Total	13,190	13,483
Retail | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	449	477
Past Due	30	36
Total	504	542
Retail | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	107	116
Past Due	12	12
Total	136	149
Retail | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	11,540	11,596
Past Due	260	335
Total	12,794	13,204
Retail | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	8,162	7,898
Past Due	50	76
Total	8,324	8,134
Retail | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,728	1,747
Past Due	37	38
Total	1,808	1,848
Retail | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,777	2,679
Past Due	43	42
Total	2,881	2,789
Retail | Financing Receivables, 1 to 29 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,771	2,301
Retail | Financing Receivables, 1 to 29 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	89	147
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	87	102
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	343	438
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	25	29
Retail | Financing Receivables, 1 to 29 Days Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	17	21
Retail | Financing Receivables, 1 to 29 Days Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	994	1,273
Retail | Financing Receivables, 1 to 29 Days Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	112	160
Retail | Financing Receivables, 1 to 29 Days Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	43	63
Retail | Financing Receivables, 1 to 29 Days Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	61	68
Retail | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	343	433
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	35	46
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	20
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	55	78
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10	10
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4	4
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	173	220
Retail | Financing Receivables, 30 to 59 Days Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	22	23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	12
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	21	20
Retail | Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	106	138
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9	18
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5	4
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	19	23
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	4
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	1
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37	55
Retail | Financing Receivables 60 To 89 Days Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	15	12
Retail | Financing Receivables 60 To 89 Days Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8	9
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	12
Retail | Financing Receivables 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	487	519
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	121	120
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	50	54
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	198	188
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	19	22
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7	7
Retail | Financing Receivables 90 Days or More Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	50	60
Retail | Financing Receivables 90 Days or More Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	13	41
Retail | Financing Receivables 90 Days or More Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18	17
Retail | Financing Receivables 90 Days or More Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 11	$ 10

ALLOWANCE FOR CREDIT LOSSES, 61

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Nonperforming Loans and Leases by Class (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	$ 868	$ 871
Loans accruing and 90 days or more past due	26	32
GNMA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans sold with right to repurchase	24	30
Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans accruing and 90 days or more past due	14	15
Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	244	238
Loans accruing and 90 days or more past due	1	5
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	30	27
Loans accruing and 90 days or more past due	0	3
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	0	0
Loans accruing and 90 days or more past due	2	0
Commercial | Commercial Banking
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	274	265
Loans accruing and 90 days or more past due	3	8
Retail | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	128	128
Loans accruing and 90 days or more past due	14	16
Retail | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	66	72
Loans accruing and 90 days or more past due	0	0
Retail | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	235	233
Loans accruing and 90 days or more past due	0	0
Retail | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	23	25
Loans accruing and 90 days or more past due	0	0
Retail | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	17	18
Loans accruing and 90 days or more past due	0	0
Retail | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	60	70
Loans accruing and 90 days or more past due	0	0
Retail | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	41	38
Loans accruing and 90 days or more past due	3	3
Retail | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	18	17
Loans accruing and 90 days or more past due	0	0
Retail | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	6	5
Loans accruing and 90 days or more past due	6	5
Retail | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonperforming loans	594	606
Loans accruing and 90 days or more past due	$ 23	$ 24

ALLOWANCE FOR CREDIT LOSSES, 62

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Performance Indicators for Nonperforming Assets (Details)	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonperforming loans and leases as a percentage of total loans and leases	0.78%	0.79%
Total nonperforming assets as a percentage of total assets	0.59%	0.60%
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonperforming loans and leases as a percentage of total loans and leases	0.25%	0.24%
Total nonperforming assets as a percentage of total assets	0.18%	0.17%
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonperforming loans and leases as a percentage of total loans and leases	0.53%	0.55%
Total nonperforming assets as a percentage of total assets	0.41%	0.43%

ALLOWANCE FOR CREDIT LOSSES, 63

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Accruing and Nonaccruing Past Due Amounts (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 1,128	$ 1,456
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	418	501
Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	130	163
Financing Receivables 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	580	792
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	192	366
Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	116	273
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	71	88
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5	5
Commercial | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	75	68
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	30	26
Commercial | Financing Receivables, 30 to 59 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	42	38
Commercial | Financing Receivables, 30 to 59 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3	4
Commercial | Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	24	25
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	23	4
Commercial | Financing Receivables 60 To 89 Days Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	20
Commercial | Financing Receivables 60 To 89 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	1
Commercial | Financing Receivables 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	93	273
Commercial | Financing Receivables 90 Days or More Past Due | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	63	243
Commercial | Financing Receivables 90 Days or More Past Due | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	28	30
Commercial | Financing Receivables 90 Days or More Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2	0
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	936	1,090
Retail | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	165	184
Retail | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	67	78
Retail | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	272	289
Retail | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	30	36
Retail | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	12
Retail | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	260	335
Retail | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	50	76
Retail | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37	38
Retail | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	43	42
Retail | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	343	433
Retail | Financing Receivables, 30 to 59 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	35	46
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	12	20
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	55	78
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10	10
Retail | Financing Receivables, 30 to 59 Days Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4	4
Retail | Financing Receivables, 30 to 59 Days Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	173	220
Retail | Financing Receivables, 30 to 59 Days Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	22	23
Retail | Financing Receivables, 30 to 59 Days Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	12
Retail | Financing Receivables, 30 to 59 Days Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	21	20
Retail | Financing Receivables 60 To 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	106	138
Retail | Financing Receivables 60 To 89 Days Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9	18
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5	4
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	19	23
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	4
Retail | Financing Receivables 60 To 89 Days Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	1
Retail | Financing Receivables 60 To 89 Days Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37	55
Retail | Financing Receivables 60 To 89 Days Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	15	12
Retail | Financing Receivables 60 To 89 Days Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8	9
Retail | Financing Receivables 60 To 89 Days Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11	12
Retail | Financing Receivables 90 Days or More Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	487	519
Retail | Financing Receivables 90 Days or More Past Due | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	121	120
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	50	54
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	198	188
Retail | Financing Receivables 90 Days or More Past Due | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	19	22
Retail | Financing Receivables 90 Days or More Past Due | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7	7
Retail | Financing Receivables 90 Days or More Past Due | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	50	60
Retail | Financing Receivables 90 Days or More Past Due | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	13	41
Retail | Financing Receivables 90 Days or More Past Due | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18	17
Retail | Financing Receivables 90 Days or More Past Due | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 11	$ 10

ALLOWANCE FOR CREDIT LOSSES, 64

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Impaired Loans by Class (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	$ 521	$ 506
Allowance on Impaired Loans	75	81
Impaired Loans Without a Related Allowance	630	625
Unpaid Contractual Balance	1,393	1,364
Total Recorded Investment in Impaired Loans	1,151	1,131
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	236	208
Allowance on Impaired Loans	47	47
Impaired Loans Without a Related Allowance	167	162
Unpaid Contractual Balance	487	443
Total Recorded Investment in Impaired Loans	403	370
Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	211	183
Allowance on Impaired Loans	42	42
Impaired Loans Without a Related Allowance	167	159
Unpaid Contractual Balance	447	403
Total Recorded Investment in Impaired Loans	378	342
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	25	25
Allowance on Impaired Loans	5	5
Impaired Loans Without a Related Allowance	0	3
Unpaid Contractual Balance	40	40
Total Recorded Investment in Impaired Loans	25	28
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	0	0
Allowance on Impaired Loans	0	0
Impaired Loans Without a Related Allowance	0	0
Unpaid Contractual Balance	0	0
Total Recorded Investment in Impaired Loans	0	0
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	285	298
Allowance on Impaired Loans	28	34
Impaired Loans Without a Related Allowance	463	463
Unpaid Contractual Balance	906	921
Total Recorded Investment in Impaired Loans	748	761
Retail | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	27	25
Allowance on Impaired Loans	2	2
Impaired Loans Without a Related Allowance	124	126
Unpaid Contractual Balance	197	197
Total Recorded Investment in Impaired Loans	151	151
Retail | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	38	41
Allowance on Impaired Loans	3	4
Impaired Loans Without a Related Allowance	78	80
Unpaid Contractual Balance	156	162
Total Recorded Investment in Impaired Loans	116	121
Retail | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	16	16
Allowance on Impaired Loans	1	1
Impaired Loans Without a Related Allowance	182	181
Unpaid Contractual Balance	242	241
Total Recorded Investment in Impaired Loans	198	197
Retail | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	28	29
Allowance on Impaired Loans	2	2
Impaired Loans Without a Related Allowance	22	22
Unpaid Contractual Balance	65	67
Total Recorded Investment in Impaired Loans	50	51
Retail | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	2	2
Allowance on Impaired Loans	0	0
Impaired Loans Without a Related Allowance	7	7
Unpaid Contractual Balance	13	14
Total Recorded Investment in Impaired Loans	9	9
Retail | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	2	2
Allowance on Impaired Loans	0	0
Impaired Loans Without a Related Allowance	22	21
Unpaid Contractual Balance	30	30
Total Recorded Investment in Impaired Loans	24	23
Retail | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	144	154
Allowance on Impaired Loans	12	17
Impaired Loans Without a Related Allowance	25	21
Unpaid Contractual Balance	169	175
Total Recorded Investment in Impaired Loans	169	175
Retail | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	24	24
Allowance on Impaired Loans	7	7
Impaired Loans Without a Related Allowance	0	1
Unpaid Contractual Balance	25	25
Total Recorded Investment in Impaired Loans	24	25
Retail | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Loans With a Related Allowance	4	5
Allowance on Impaired Loans	1	1
Impaired Loans Without a Related Allowance	3	4
Unpaid Contractual Balance	9	10
Total Recorded Investment in Impaired Loans	$ 7	$ 9

ALLOWANCE FOR CREDIT LOSSES, 65

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Additional Impaired Loan Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	$ 10	$ 9
Average Recorded Investment	1,065	1,234
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	2	1
Average Recorded Investment	320	441
Commercial | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	2	1
Average Recorded Investment	293	396
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	0	0
Average Recorded Investment	27	45
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	0	0
Average Recorded Investment	0	0
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	8	8
Average Recorded Investment	745	793
Retail | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	1	1
Average Recorded Investment	149	176
Retail | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	2	2
Average Recorded Investment	118	146
Retail | Home equity lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	2	2
Average Recorded Investment	194	198
Retail | Home equity loans serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	1	1
Average Recorded Investment	50	57
Retail | Home equity lines of credit serviced by others
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	0	0
Average Recorded Investment	9	9
Retail | Automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	0	0
Average Recorded Investment	22	19
Retail | Education
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	2	2
Average Recorded Investment	171	152
Retail | Credit cards
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	0	0
Average Recorded Investment	24	25
Retail | Other retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Interest Income Recognized	0	0
Average Recorded Investment	$ 8	$ 11

ALLOWANCE FOR CREDIT LOSSES, 66

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Unfunded Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments tied to TDRs	$ 35	$ 39
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR balance included in impaired loans	202	129
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR balance included in impaired loans	$ 748	$ 761

ALLOWANCE FOR CREDIT LOSSES, 67

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Troubled Debt Restructuring (Details) $ in Millions		3 Months Ended
		Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		$ 1	$ 1
Charge-offs Resulting from Modification		$ 1	$ 1
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	668	670
Pre-Modification Outstanding Recorded Investment	[1]	$ 7	$ 9
Post-Modification Outstanding Recorded Investment	[1]	$ 7	$ 10
Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	73	80
Pre-Modification Outstanding Recorded Investment	[2]	$ 8	$ 10
Post-Modification Outstanding Recorded Investment	[2]	$ 8	$ 10
Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	591	543
Pre-Modification Outstanding Recorded Investment	[3]	$ 95	$ 25
Post-Modification Outstanding Recorded Investment	[3]	95	24
Commercial
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Commercial | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	1	2
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1
Commercial | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	7	7
Pre-Modification Outstanding Recorded Investment	[2]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[2]	$ 1	$ 1
Commercial | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	18	1
Pre-Modification Outstanding Recorded Investment	[3]	$ 74	$ 1
Post-Modification Outstanding Recorded Investment	[3]	75	1
Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Commercial | Commercial | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	1	2
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1
Commercial | Commercial | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	6	7
Pre-Modification Outstanding Recorded Investment	[2]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[2]	$ 1	$ 1
Commercial | Commercial | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	18	0
Pre-Modification Outstanding Recorded Investment	[3]	$ 74	$ 0
Post-Modification Outstanding Recorded Investment	[3]	75	0
Commercial | Commercial real estate
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Commercial | Commercial real estate | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	0	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Commercial | Commercial real estate | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	1	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Commercial | Commercial real estate | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	0	0
Pre-Modification Outstanding Recorded Investment	[3]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[3]	0	0
Commercial | Leases
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Commercial | Leases | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	0	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Commercial | Leases | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Commercial | Leases | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	0	1
Pre-Modification Outstanding Recorded Investment	[3]	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	[3]	0	1
Retail
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		1	1
Charge-offs Resulting from Modification		$ 1	$ 1
Retail | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	667	668
Pre-Modification Outstanding Recorded Investment	[1]	$ 7	$ 8
Post-Modification Outstanding Recorded Investment	[1]	$ 7	$ 9
Retail | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	66	73
Pre-Modification Outstanding Recorded Investment	[2]	$ 7	$ 9
Post-Modification Outstanding Recorded Investment	[2]	$ 7	$ 9
Retail | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	573	542
Pre-Modification Outstanding Recorded Investment	[3]	$ 21	$ 24
Post-Modification Outstanding Recorded Investment	[3]	20	23
Retail | Residential mortgages
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Residential mortgages | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	7	18
Pre-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 1	$ 2
Retail | Residential mortgages | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	7	11
Pre-Modification Outstanding Recorded Investment	[2]	$ 1	$ 3
Post-Modification Outstanding Recorded Investment	[2]	$ 1	$ 3
Retail | Residential mortgages | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	53	48
Pre-Modification Outstanding Recorded Investment	[3]	$ 6	$ 4
Post-Modification Outstanding Recorded Investment	[3]	6	4
Retail | Home equity loans
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Home equity loans | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	11	21
Pre-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Retail | Home equity loans | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	1
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Retail | Home equity loans | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	32	102
Pre-Modification Outstanding Recorded Investment	[3]	$ 2	$ 6
Post-Modification Outstanding Recorded Investment	[3]	2	6
Retail | Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Home equity lines of credit | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	15	16
Pre-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Retail | Home equity lines of credit | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	42	51
Pre-Modification Outstanding Recorded Investment	[2]	$ 5	$ 6
Post-Modification Outstanding Recorded Investment	[2]	$ 5	$ 6
Retail | Home equity lines of credit | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	93	75
Pre-Modification Outstanding Recorded Investment	[3]	$ 7	$ 6
Post-Modification Outstanding Recorded Investment	[3]	7	6
Retail | Home equity loans serviced by others
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Home equity loans serviced by others | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	1	6
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 1
Retail | Home equity loans serviced by others | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Retail | Home equity loans serviced by others | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	7	14
Pre-Modification Outstanding Recorded Investment	[3]	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	[3]	0	1
Retail | Home equity lines of credit serviced by others
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Home equity lines of credit serviced by others | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	2	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Retail | Home equity lines of credit serviced by others | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	2
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Retail | Home equity lines of credit serviced by others | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	3	11
Pre-Modification Outstanding Recorded Investment	[3]	$ 0	$ 1
Post-Modification Outstanding Recorded Investment	[3]	0	1
Retail | Automobile
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 1	$ 1
Retail | Automobile | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	36	40
Pre-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[1]	$ 1	$ 1
Retail | Automobile | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	17	8
Pre-Modification Outstanding Recorded Investment	[2]	$ 1	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 1	$ 0
Retail | Automobile | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	269	276
Pre-Modification Outstanding Recorded Investment	[3]	$ 5	$ 5
Post-Modification Outstanding Recorded Investment	[3]	4	4
Retail | Education
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Education | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	0	0
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Retail | Education | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Retail | Education | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	112	15
Pre-Modification Outstanding Recorded Investment	[3]	$ 1	$ 1
Post-Modification Outstanding Recorded Investment	[3]	1	1
Retail | Credit cards
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		0	1
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Credit cards | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	594	565
Pre-Modification Outstanding Recorded Investment	[1]	$ 3	$ 3
Post-Modification Outstanding Recorded Investment	[1]	$ 3	$ 3
Retail | Credit cards | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Retail | Credit cards | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	0	0
Pre-Modification Outstanding Recorded Investment	[3]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[3]	0	0
Retail | Other retail
Financing Receivable, Modifications [Line Items]
Net Change to ALLL Resulting from Modification		1	0
Charge-offs Resulting from Modification		$ 0	$ 0
Retail | Other retail | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[1]	1	1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[1]	$ 0	$ 0
Retail | Other retail | Maturity Extension
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[2]	0	0
Pre-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[2]	$ 0	$ 0
Retail | Other retail | Other
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	[3]	4	1
Pre-Modification Outstanding Recorded Investment	[3]	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	[3]	$ 0	$ 0
[1]	Includes modifications that consist of multiple concessions, one of which is an interest rate reduction.
[2]	Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction).
[3]	Includes modifications other than interest rate reductions or maturity extensions, such as lowering scheduled payments for a specified period of time, principal forgiveness, and capitalizing arrearages. Also included are the following: deferrals, trial modifications, certain bankruptcies, loans in forbearance and prepayment plans. Modifications can include the deferral of accrued interest resulting in post modification balances being higher than pre-modification.

ALLOWANCE FOR CREDIT LOSSES, 68

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Default of Modified Debt Agreements (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	282	264
Balance Defaulted | $	$ 13	$ 14
Commercial
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	3	2
Balance Defaulted | $	$ 3	$ 4
Commercial | Commercial
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	3	1
Balance Defaulted | $	$ 3	$ 0
Commercial | Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	1
Balance Defaulted | $	$ 0	$ 4
Commercial | Leases
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0
Balance Defaulted | $	$ 0	$ 0
Retail
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	279	262
Balance Defaulted | $	$ 10	$ 10
Retail | Residential mortgages
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	26	45
Balance Defaulted | $	$ 3	$ 6
Retail | Home equity loans
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	11	9
Balance Defaulted | $	$ 1	$ 0
Retail | Home equity lines of credit
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	66	35
Balance Defaulted | $	$ 5	$ 3
Retail | Home equity loans serviced by others
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	5	1
Balance Defaulted | $	$ 0	$ 0
Retail | Home equity lines of credit serviced by others
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	3
Balance Defaulted | $	$ 0	$ 0
Retail | Automobile
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	46	34
Balance Defaulted | $	$ 0	$ 0
Retail | Education
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	5	7
Balance Defaulted | $	$ 0	$ 0
Retail | Credit cards
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	119	126
Balance Defaulted | $	$ 1	$ 1
Retail | Other retail
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	2
Balance Defaulted | $	$ 0	$ 0

ALLOWANCE FOR CREDIT LOSSES, 69

ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Loans with Indicators of High Credit Risk (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 111,425	$ 110,617
High loan-to-value
Financing Receivable, Recorded Investment [Line Items]
Total	747	796
High loan-to-value | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total	357	366
High loan-to-value | Home Equity Loans and Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total	160	166
High loan-to-value | Home Equity Products Serviced by Others
Financing Receivable, Recorded Investment [Line Items]
Total	230	264
High loan-to-value | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
High loan-to-value | Education
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Interest-only/negative amortization
Financing Receivable, Recorded Investment [Line Items]
Total	1,766	1,764
Interest-only/negative amortization | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total	1,765	1,763
Interest-only/negative amortization | Home Equity Loans and Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Interest-only/negative amortization | Home Equity Products Serviced by Others
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Interest-only/negative amortization | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Interest-only/negative amortization | Education
Financing Receivable, Recorded Investment [Line Items]
Total	1	1
Low introductory rate
Financing Receivable, Recorded Investment [Line Items]
Total	190	197
Low introductory rate | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Low introductory rate | Home Equity Loans and Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Low introductory rate | Home Equity Products Serviced by Others
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Low introductory rate | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total	190	197
Low introductory rate | Education
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Multiple characteristics and other
Financing Receivable, Recorded Investment [Line Items]
Total	1	1
Multiple characteristics and other | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total	1	1
Multiple characteristics and other | Home Equity Loans and Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Multiple characteristics and other | Home Equity Products Serviced by Others
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Multiple characteristics and other | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Multiple characteristics and other | Education
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Credit risk, loans with increased credit exposure
Financing Receivable, Recorded Investment [Line Items]
Total	2,704	2,758
Credit risk, loans with increased credit exposure | Residential Mortgages
Financing Receivable, Recorded Investment [Line Items]
Total	2,123	2,130
Credit risk, loans with increased credit exposure | Home Equity Loans and Lines of Credit
Financing Receivable, Recorded Investment [Line Items]
Total	160	166
Credit risk, loans with increased credit exposure | Home Equity Products Serviced by Others
Financing Receivable, Recorded Investment [Line Items]
Total	230	264
Credit risk, loans with increased credit exposure | Credit Cards
Financing Receivable, Recorded Investment [Line Items]
Total	190	197
Credit risk, loans with increased credit exposure | Education
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1	$ 1

MORTGAGE BANKING - Residential

MORTGAGE BANKING - Residential Mortgage Loan Sales (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Mortgage Loans on Real Estate [Line Items]
Residential mortgage loan sale proceeds	$ 655	$ 815
Valuation recoveries	3	0
Residential mortgages
Mortgage Loans on Real Estate [Line Items]
Residential mortgage loan sale proceeds	655	815
Gain on sales	13	10
Mortgage servicing fees	15	13
Repurchased residential mortgages	2	1
Valuation recoveries	$ 3	$ 0

MORTGAGE BANKING - Changes Rela

MORTGAGE BANKING - Changes Related to MSRs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Valuation allowance for servicing assets:
Valuation recoveries	$ (3)	$ 0
Residential mortgages
MSRs:
Balance as of beginning of period	201	168
Amount capitalized	8	10
Amortization	(8)	(8)
Carrying amount before valuation allowance	201	170
Valuation allowance for servicing assets:
Balance at beginning of period	3	5
Valuation recoveries	(3)	0
Balance at end of period	0	5
Net carrying value of MSRs	$ 201	$ 165

MORTGAGE BANKING - Economic Ass

MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs (Details) - Residential mortgages - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Fair value	$ 246	$ 218
Weighted average life (in years)	6 years 8 months 12 days	5 years 10 months 24 days
Weighted average constant prepayment rate	8.60%	10.00%
Weighted average discount rate	9.90%	9.90%
Minimum
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Weighted average life (in years)	2 years 4 months 24 days	2 years 3 months 18 days
Weighted average constant prepayment rate	5.20%	6.60%
Weighted average discount rate	9.10%	9.10%
Maximum
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Weighted average life (in years)	9 years 3 months 18 days	8 years 4 months 24 days
Weighted average constant prepayment rate	20.30%	20.10%
Weighted average discount rate	12.10%	12.10%

MORTGAGE BANKING - Economic A73

MORTGAGE BANKING - Economic Assumptions Used to Estimate Value of MSRs Capitalized (Details) - Residential mortgages	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Servicing Assets at Fair Value [Line Items]
Weighted average life (in years)	7 years 10 months 24 days	6 years 10 months 24 days
Weighted average constant prepayment rate	7.30%	8.70%
Weighted average discount rate	9.80%	9.90%

MORTGAGE BANKING - Sensitivity

MORTGAGE BANKING - Sensitivity Analysis (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Minimum
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Adverse change in basis points	0.50%	0.50%
Maximum
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Adverse change in basis points	1.00%	1.00%
Prepayment rate
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Decline in fair value from a 50 basis point decrease in interest rates	$ 16	$ 22
Decline in fair value from a 100 basis point decrease in interest rates	48	46
Weighted average discount rate
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Decline in fair value from a 50 basis point increase in weighted average discount rate	5	4
Decline in fair value from a 100 basis point increase in weighted average discount rate	$ 9	$ 8

VARIABLE INTEREST ENTITIES - Na

VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
LIHTC Investments
Variable Interest Entity
Net impairment losses recognized in earnings	$ 0	$ 0

VARIABLE INTEREST ENTITIES - Sc

VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
LIHTC Investments
Variable Interest Entity
LIHTC investment included in other assets	$ 993	$ 951
LIHTC unfunded commitments included in other liabilities	521	491
Renewable Energy
Variable Interest Entity
Renewable energy investments included in other assets	$ 331	$ 335

VARIABLE INTEREST ENTITIES - 77

VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Variable Interest Entity
Tax credits included in income tax expense	$ 25	$ 21
Amortization expense included in income tax expense	27	23
Other tax benefits included in income tax expense	$ 6	$ 7

BORROWED FUNDS - Narrative (Det

BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Hedging basis adjustments	$ 369	$ 693
Short-term borrowed funds	1,809	2,671
Available borrowing capacity	40,200
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt
Debt Instrument [Line Items]
Short-term borrowed funds	10,400	9,400
Federal Home Loan advances
Debt Instrument [Line Items]
Available borrowing capacity	7,400	8,000
Parent Company
Debt Instrument [Line Items]
Principal balance	2,300	2,300
Unamortized deferred issuance costs and/or discounts	(5)	(5)
Banking Subsidiaries
Debt Instrument [Line Items]
Principal balance	11,300	9,500
Unamortized deferred issuance costs and/or discounts	(18)	(19)
Hedging basis adjustments	$ (91)	$ (63)

BORROWED FUNDS - Short Term Deb

BORROWED FUNDS - Short Term Debt (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Total short-term borrowed funds		$ 1,809	$ 2,671
Federal funds purchased
Short-term Debt [Line Items]
Total short-term borrowed funds		0	460
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Total short-term borrowed funds		315	355
Other short-term borrowed funds
Short-term Debt [Line Items]
Total short-term borrowed funds	[1]	1,494	1,856
CBNA Global Bank Note Program
Short-term Debt [Line Items]
Total short-term borrowed funds		1,500	750
Unamortized deferred issuance costs and/or discounts		(2)	(1)
Other basis adjustments		$ (14)	$ (4)
[1]	March 31, 2018 includes $1.5 billion of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($2) million and other basis adjustments of ($14) million. December 31, 2017 includes $750 million of debt issued under CBNA’s Global Bank Note Program maturing within one year, with unamortized deferred issuance costs and/or discounts of ($1) million and other basis adjustments of ($4) million.

BORROWED FUNDS - Short Term Bor

BORROWED FUNDS - Short Term Borrowed Debt Key Data (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Federal funds purchased and securities sold under agreements to repurchase
Short-term Debt [Line Items]
Weighted-average interest rate at period end	[1]	0.00%	0.43%	0.74%
Maximum amount outstanding at month-end during the period	[2]	$ 625	$ 1,174	$ 1,174
Average amount outstanding during the period	[2]	$ 645	$ 882	$ 776
Weighted-average interest rate during the period	[1]	0.66%	0.22%	0.36%
Other short-term borrowed funds
Short-term Debt [Line Items]
Weighted-average interest rate at period end	[1]	2.41%	1.08%	1.72%
Maximum amount outstanding at month-end during the period		$ 1,853	$ 3,508	$ 3,508
Average amount outstanding during the period		$ 1,481	$ 2,963	$ 2,321
Weighted-average interest rate during the period	[1]	2.14%	1.08%	1.32%
[1]	Rates exclude certain hedging costs.
[2]	Balances are net of certain short-term receivables associated with reverse repurchase agreements, as applicable.

BORROWED FUNDS - Long Term Debt

BORROWED FUNDS - Long Term Debt (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term borrowed funds		$ 13,486	$ 11,765
Banking Subsidiaries
Debt Instrument [Line Items]
Long-term borrowed funds		11,166
Banking Subsidiaries | Senior Unsecured Notes | 2.450% senior unsecured notes, due 2019
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 738	743
Interest rate		2.45%
Banking Subsidiaries | Senior Unsecured Notes | 2.500% senior unsecured notes, due 2019
Debt Instrument [Line Items]
Long-term borrowed funds	[1],[2]	$ 0	741
Interest rate		2.50%
Banking Subsidiaries | Senior Unsecured Notes | 2.25% Senior Unsecured Notes, Due 2020, Settlement Date of March 02, 2017 [Member]
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 688	692
Interest rate		2.25%
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 299	299
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	250	249
Banking Subsidiaries | Senior Unsecured Notes | 2.200% senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 499	498
Interest rate		2.20%
Banking Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due 2020
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 734	742
Interest rate		2.25%
Banking Subsidiaries | Senior Unsecured Notes | 2.550% senior unsecured notes, due 2021
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 953	964
Interest rate		2.55%
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2022
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 249	249
Banking Subsidiaries | Senior Unsecured Notes | 2.650% senior unsecured notes, due 2022
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 482	491
Interest rate		2.65%
Banking Subsidiaries | Senior Unsecured Notes | 3.700% senior unsecured notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 500	0
Interest rate		3.70%
Banking Subsidiaries | Senior Unsecured Notes | Floating-rate senior unsecured notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term borrowed funds	[1]	$ 249	0
Banking Subsidiaries | Federal Home Loan advances
Debt Instrument [Line Items]
Long-term borrowed funds		5,511	3,761
Banking Subsidiaries | Other
Debt Instrument [Line Items]
Long-term borrowed funds		14	16
Parent Company
Debt Instrument [Line Items]
Long-term borrowed funds		2,320
Parent Company | Subordinated Debt | 4.150% fixed-rate subordinated debt, due 2022
Debt Instrument [Line Items]
Long-term borrowed funds		$ 348	348
Interest rate		4.15%
Parent Company | Subordinated Debt | 5.158% fixed-to-floating rate subordinated debt, due 2023, converting to floating at 3-month LIBOR 3.56% and callable beginning June 2018
Debt Instrument [Line Items]
Long-term borrowed funds		$ 333	333
Interest rate		5.158%
Parent Company | Subordinated Debt | 3.750% fixed-rate subordinated debt, due 2024
Debt Instrument [Line Items]
Long-term borrowed funds		$ 250	250
Interest rate		3.75%
Parent Company | Subordinated Debt | 4.023% fixed-rate subordinated debt, due 2024
Debt Instrument [Line Items]
Long-term borrowed funds		$ 42	42
Interest rate		4.023%
Parent Company | Subordinated Debt | 4.350% fixed-rate subordinated debt, due 2025
Debt Instrument [Line Items]
Long-term borrowed funds		$ 249	249
Interest rate		4.35%
Parent Company | Subordinated Debt | 4.300% fixed-rate subordinated debt, due 2025
Debt Instrument [Line Items]
Long-term borrowed funds		$ 749	749
Interest rate		4.30%
Parent Company | Subordinated Debt | LIBOR | 5.158% fixed-to-floating rate subordinated debt, due 2023, converting to floating at 3-month LIBOR 3.56% and callable beginning June 2018
Debt Instrument [Line Items]
Interest rate		3.56%
Parent Company | Senior Unsecured Notes | 2.375% fixed-rate senior unsecured debt, due 2021
Debt Instrument [Line Items]
Long-term borrowed funds		$ 349	$ 349
Interest rate		2.375%
[1]	Issued under CBNA’s Global Bank Note Program.
[2]	Reclassified to short-term borrowed funds.

BORROWED FUNDS - Maturities of

BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
2,019	$ 6,244
2,020	2,473
2,021	1,305
2,022	1,084
2,023	1,083
2024 and thereafter	1,297
Total	13,486	$ 11,765
Banking Subsidiaries
Debt Instrument [Line Items]
2,019	6,244
2,020	2,473
2,021	956
2,022	736
2,023	750
2024 and thereafter	7
Total	11,166
Parent Company
Debt Instrument [Line Items]
2,019	0
2,020	0
2,021	349
2,022	348
2,023	333
2024 and thereafter	1,290
Total	$ 2,320

DERIVATIVES - Narrative (Detail

DERIVATIVES - Narrative (Details) $ in Millions	Mar. 31, 2018USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net loss (pre-tax) on derivatives expected to be reclassified in next 12 months	$ 4

DERIVATIVES - Schedule of Deriv

DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Derivative Assets
Derivative assets		$ 369	$ 693
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(83)	(72)
Less: Cash collateral applied	[1]	(12)	(4)
Total net derivative fair values presented in the Consolidated Balance Sheets		274	617
Derivative Liabilities
Derivative Liabilities		532	533
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(83)	(72)
Less: Cash collateral applied	[1]	(118)	(151)
Total net derivative fair values presented in the Consolidated Balance Sheets		331	310
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative assets		369	693
Derivative Liabilities
Derivative Liabilities		532	533
Interest rate contracts
Derivative Assets
Derivative assets		204	538
Derivative Liabilities
Derivative Liabilities		377	379
Interest rate contracts | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[2]	11,550	13,300
Derivative Assets
Derivative assets		0	0
Derivative Liabilities
Derivative Liabilities		0	0
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[2]	88,089	80,180
Derivative Assets
Derivative assets		204	538
Derivative Liabilities
Derivative Liabilities		377	379
Foreign exchange contracts
Derivative Assets
Derivative assets		158	148
Derivative Liabilities
Derivative Liabilities		150	149
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[2]	9,525	9,882
Derivative Assets
Derivative assets		158	148
Derivative Liabilities
Derivative Liabilities		150	149
Other contracts
Derivative Assets
Derivative assets		7	7
Derivative Liabilities
Derivative Liabilities		5	5
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[2]	1,142	1,039
Derivative Assets
Derivative assets		7	7
Derivative Liabilities
Derivative Liabilities		$ 5	$ 5
[1]	Amounts represent the impact of enforceable master netting agreements that allow the Company to net settle positive and negative positions.
[2]	The notional or contractual amount of interest rate derivatives and foreign exchange contracts is the amount upon which interest and other payments under the contract are based. For interest rate contracts, the notional amount is typically not exchanged. Therefore, notional amounts should not be taken as the measure of credit or market risk, as they do not measure the true economic risk of these contracts.

DERIVATIVES - Schedule of Fair

DERIVATIVES - Schedule of Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	$ 5	$ 10
Hedge of interest rate risk | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	(38)	(6)
Hedged Item	37	6
Hedge Ineffectiveness	$ (1)	$ 0

DERIVATIVES - Effect of Derivat

DERIVATIVES - Effect of Derivative Instruments on Net Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amounts reclassified from OCI to interest expense		$ (237)	$ (155)
Amount Reclassified from AOCI
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of loss recognized in OCI	[1]	(70)	(5)
Amount Reclassified from AOCI | Net Unrealized (Losses) Gains on Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Amounts reclassified from OCI to interest income	[2]	(6)	12
Amounts reclassified from OCI to interest expense	[2]	$ 4	$ (2)
[1]	The cumulative effective gains and losses on the Company’s cash flow hedging activities are included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets.
[2]	This amount includes both (a) the amortization of effective gains and losses associated with the Company’s terminated cash flow hedges and (b) the current reporting period’s interest settlements realized on the Company’s active cash flow hedges. Both (a) and (b) were previously included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets and were subsequently recorded as adjustments to the interest income or expense of the underlying hedged item.

DERIVATIVES - Effect of Custome

DERIVATIVES - Effect of Customer Derivatives and Economic Hedges on Net Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income		$ 5	$ 10
Customer derivative contracts | Foreign Exchange and Interest Rate Products | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income	[1]	(204)	(3)
Customer derivative contracts | Foreign Exchange and Interest Rate Products | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income	[1]	11	18
Customer derivative contracts | Mortgage Banking Fees | Residential loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income	[2]	(1)	5
Economic hedges | Foreign Exchange and Interest Rate Products | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income	[1]	216	15
Economic hedges | Foreign Exchange and Interest Rate Products | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income	[1]	(17)	(14)
Economic hedges | Mortgage Banking Fees | Forward sale contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amounts Recognized in Noninterest Income	[2]	$ 0	$ (11)
[1]	Reported in foreign exchange and interest rate products on the Consolidated Statements of Operations.
[2]	Reported in mortgage banking fees on the Consolidated Statements of Operations.

RECLASSIFICATIONS OUT OF ACCU88

RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 20,270	$ 19,747
Other-than-temporary impairment not recognized in earnings on debt securities	(1)	(12)
Ending balance	20,059	19,847
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(820)	(668)
Other comprehensive (loss) income before reclassifications	(324)	2
Other-than-temporary impairment not recognized in earnings on debt securities	(1)	(12)
Amounts reclassified from other comprehensive income (loss)	0	(5)
Net other comprehensive (loss) income	(325)	(15)
Ending balance	(1,145)	(683)
Net Unrealized (Losses) Gains on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(143)	(88)
Other comprehensive (loss) income before reclassifications	(52)	(3)
Other-than-temporary impairment not recognized in earnings on debt securities	0	0
Amounts reclassified from other comprehensive income (loss)	2	(6)
Net other comprehensive (loss) income	(50)	(9)
Ending balance	(193)	(97)
Net Unrealized (Losses) Gains on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(236)	(186)
Other comprehensive (loss) income before reclassifications	(272)	5
Other-than-temporary impairment not recognized in earnings on debt securities	(1)	(12)
Amounts reclassified from other comprehensive income (loss)	(5)	(2)
Net other comprehensive (loss) income	(278)	(9)
Ending balance	(514)	(195)
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(441)	(394)
Other comprehensive (loss) income before reclassifications	0	0
Other-than-temporary impairment not recognized in earnings on debt securities	0	0
Amounts reclassified from other comprehensive income (loss)	3	3
Net other comprehensive (loss) income	3	3
Ending balance	$ (438)	$ (391)

RECLASSIFICATIONS OUT OF ACCU89

RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ (237)	$ (155)
Net debt securities impairment losses recognized in earnings		(1)	(1)
Other operating expense		(470)	(446)
Income before income tax expense		501	434
Income tax expense		113	114
NET INCOME		388	320
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense		1	3
NET INCOME		0	5
Reclassification adjustment for net derivative (losses) gains included in net income: | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	[1]	(6)	12
Interest expense	[1]	4	(2)
Income before income tax expense		(2)	10
Income tax expense		0	4
NET INCOME		(2)	6
Reclassification of net debt securities gains (losses) to net income: | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net		8	4
Net debt securities impairment losses recognized in earnings		(1)	(1)
Income before income tax expense		7	3
Income tax expense		2	1
NET INCOME		5	2
Reclassification of changes related to the employee benefit plan: | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other operating expense		(4)	(5)
Income before income tax expense		(4)	(5)
Income tax expense		(1)	(2)
NET INCOME		$ (3)	$ (3)
[1]	This amount includes both (a) the amortization of effective gains and losses associated with the Company’s terminated cash flow hedges and (b) the current reporting period’s interest settlements realized on the Company’s active cash flow hedges. Both (a) and (b) were previously included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets and were subsequently recorded as adjustments to the interest income or expense of the underlying hedged item.

RECLASSIFICATIONS OUT OF ACCU90

RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE LOSS - Effects to Net Income of Amounts Reclassified Out of OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net interest income	$ 1,091	$ 1,005
Provision for credit losses	78	96
Noninterest income	371	379
Noninterest expense	883	854
Income before income tax expense	501	434
Income tax expense	113	114
NET INCOME	388	320
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net interest income	(2)	10
Noninterest income	7	3
Noninterest expense	4	5
Income tax expense	1	3
NET INCOME	$ 0	$ 5

STOCKHOLDERS' EQUITY (Details)

STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Preferred Stock
Preferred stock, authorized (in shares)	100,000,000		100,000,000
Preferred stock, outstanding (in shares)	250,000		250,000
Preferred stock, par value (in dollars per share)	$ 25		$ 25
Treasury Stock
Treasury stock purchased	$ 175	$ 130
Treasury stock purchased (in shares)	3,887,023

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)counterparty	Dec. 31, 2017USD ($)	Dec. 31, 2003
Letters of Credit [Abstract]
Letters of credit outstanding, amount	$ 2	$ 3
Risk Participation Agreements [Abstract]
Risk participation agreements	$ 18	16
Risk participation agreements number of counterparties | counterparty	88
Risk participation agreements, Maximum term	8 years
Commercial real estate loans held for sale | Purchase commitment
Other Commitments [Abstract]
Unsettled commercial loan trade purchases	$ 231	65
Unsettled commercial loan trade sales	$ 283	132
Minimum
Risk Participation Agreements [Abstract]
Risk participation agreements, Average term	1 year
Maximum
Risk Participation Agreements [Abstract]
Risk participation agreements, Average term	5 years
Marketing rights
Marketing Rights [Abstract]
Commitment period			25 years
Payments made		$ 3
Remaining obligation due	$ 41
Financial standby letters of credit
Letters of Credit [Abstract]
Letters of credit outstanding	10 years
Commercial letters of credit
Letters of Credit [Abstract]
Letters of credit outstanding	1 year

COMMITMENTS AND CONTINGENCIES93

COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Commitment amount	$ 65,290	$ 65,159
Undrawn commitments to extend credit
Other Commitments [Line Items]
Commitment amount	63,107	62,959
Financial standby letters of credit
Other Commitments [Line Items]
Commitment amount	1,966	2,036
Performance letters of credit
Other Commitments [Line Items]
Commitment amount	109	47
Commercial letters of credit
Other Commitments [Line Items]
Commitment amount	43	53
Marketing rights
Other Commitments [Line Items]
Commitment amount	41	41
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	18	16
Residential mortgage loans sold with recourse
Other Commitments [Line Items]
Commitment amount	$ 6	$ 7

FAIR VALUE MEASUREMENTS - Narra

FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other income	$ 18	$ 25
Commercial real estate loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans in this portfolio that were 90 days or more past due or nonaccruing	0		$ 0
Other income	1	2
Mortgage Banking Fees | Residential loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value	$ (3)	$ 7

FAIR VALUE MEASUREMENTS - Resid

FAIR VALUE MEASUREMENTS - Residential Mortgage and Commercial Real Estate Loans Held For Sale (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate Fair Value	$ 478	$ 497
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate Fair Value	478	497
Level 2 | Residential loans held for sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate Fair Value	289	326
Aggregate Unpaid Principal	289	326
Aggregate Fair Value Less Aggregate Unpaid Principal	0	0
Level 2 | Commercial and commercial real estate loans held for sale, at fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate Fair Value	189	171
Aggregate Unpaid Principal	189	171
Aggregate Fair Value Less Aggregate Unpaid Principal	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Sched

FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Assets
Securities available for sale	[1]	$ 19,958	$ 20,157
Loans held for sale, at fair value		478	497
Derivative assets		369	693
Money market mutual fund		168	165
Other investments		4	4
Total equity securities, at fair value		172	169
Total assets		20,977	21,516
Liabilities
Total derivative liabilities		532	533
Total liabilities		532	533
Interest rate contracts
Assets
Derivative assets		204	538
Liabilities
Total derivative liabilities		377	379
Foreign exchange contracts
Assets
Derivative assets		158	148
Liabilities
Total derivative liabilities		150	149
Other contracts
Assets
Derivative assets		7	7
Liabilities
Total derivative liabilities		5	5
Mortgage-backed securities
Assets
Securities available for sale		19,940	20,139
State and political subdivisions
Assets
Securities available for sale		6	6
U.S. Treasury and other
Assets
Securities available for sale		12	12
Residential loans held for sale
Assets
Loans held for sale, at fair value		289	326
Commercial loans held for sale
Assets
Loans held for sale, at fair value		189	171
Level 1
Assets
Securities available for sale		12	12
Loans held for sale, at fair value		0	0
Derivative assets		0	0
Money market mutual fund		168	165
Other investments		0	0
Total equity securities, at fair value		168	165
Total assets		180	177
Liabilities
Total derivative liabilities		0	0
Total liabilities		0	0
Level 1 | Interest rate contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Foreign exchange contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Other contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 1 | Mortgage-backed securities
Assets
Securities available for sale		0	0
Level 1 | State and political subdivisions
Assets
Securities available for sale		0	0
Level 1 | U.S. Treasury and other
Assets
Securities available for sale		12	12
Level 1 | Residential loans held for sale
Assets
Loans held for sale, at fair value		0	0
Level 1 | Commercial loans held for sale
Assets
Loans held for sale, at fair value		0	0
Level 2
Assets
Securities available for sale		19,946	20,145
Loans held for sale, at fair value		478	497
Derivative assets		369	693
Money market mutual fund		0	0
Other investments		4	4
Total equity securities, at fair value		4	4
Total assets		20,797	21,339
Liabilities
Total derivative liabilities		532	533
Total liabilities		532	533
Level 2 | Interest rate contracts
Assets
Derivative assets		204	538
Liabilities
Total derivative liabilities		377	379
Level 2 | Foreign exchange contracts
Assets
Derivative assets		158	148
Liabilities
Total derivative liabilities		150	149
Level 2 | Other contracts
Assets
Derivative assets		7	7
Liabilities
Total derivative liabilities		5	5
Level 2 | Mortgage-backed securities
Assets
Securities available for sale		19,940	20,139
Level 2 | State and political subdivisions
Assets
Securities available for sale		6	6
Level 2 | U.S. Treasury and other
Assets
Securities available for sale		0	0
Level 2 | Residential loans held for sale
Assets
Loans held for sale, at fair value		289	326
Level 2 | Commercial loans held for sale
Assets
Loans held for sale, at fair value		189	171
Level 3
Assets
Securities available for sale		0	0
Loans held for sale, at fair value		0	0
Derivative assets		0	0
Money market mutual fund		0	0
Other investments		0	0
Total equity securities, at fair value		0	0
Total assets		0	0
Liabilities
Total derivative liabilities		0	0
Total liabilities		0	0
Level 3 | Interest rate contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Foreign exchange contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Other contracts
Assets
Derivative assets		0	0
Liabilities
Total derivative liabilities		0	0
Level 3 | Mortgage-backed securities
Assets
Securities available for sale		0	0
Level 3 | State and political subdivisions
Assets
Securities available for sale		0	0
Level 3 | U.S. Treasury and other
Assets
Securities available for sale		0	0
Level 3 | Residential loans held for sale
Assets
Loans held for sale, at fair value		0	0
Level 3 | Commercial loans held for sale
Assets
Loans held for sale, at fair value		$ 0	$ 0
[1]	Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

FAIR VALUE MEASUREMENTS - Sch97

FAIR VALUE MEASUREMENTS - Schedule of Gain (Loss) on Assets and Liabilities Measured on Nonrecurring Basis Included in Earnings (Details) - Nonrecurring measurement basis - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Impaired collateral-dependent loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) included in earnings on assets measured on a nonrecurring basis	$ (2)	$ (19)
MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) included in earnings on assets measured on a nonrecurring basis	3	0
Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) included in earnings on assets measured on a nonrecurring basis	(1)	(1)
Leased assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) included in earnings on assets measured on a nonrecurring basis	$ 0	$ 4

FAIR VALUE MEASUREMENTS - Sch98

FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements on a Nonrecurring Basis (Details) - Nonrecurring measurement basis - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired collateral-dependent loans	$ 418	$ 393
MSRs	246	218
Foreclosed assets	29	31
Leased assets	110	112
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired collateral-dependent loans	0	0
MSRs	0	0
Foreclosed assets	0	0
Leased assets	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired collateral-dependent loans	418	393
MSRs	0	0
Foreclosed assets	29	31
Leased assets	110	112
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired collateral-dependent loans	0	0
MSRs	246	218
Foreclosed assets	0	0
Leased assets	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Sch99

FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		$ 4,555	$ 4,685
Securities held-to-maturity, fair value		4,439	4,668
Equity securities, at cost, carrying value		748	722
Equity securities, at cost, fair value		748	722
Other loans held for sale, carrying value		322	221
Other loans held for sale, fair value		322	221
Loans and leases, carrying value	[1],[2]	111,425	110,617
Loans and leases, fair value		110,756	111,168
Deposits, carrying value		115,730	115,089
Deposits, fair value		115,563	115,039
Federal funds purchased and securities sold under agreements to repurchase, carrying value		315	815
Federal funds purchased and securities sold under agreements to repurchase, fair value		315	815
Other short-term borrowed funds, carrying value		1,494	1,856
Other short-term borrowed funds, fair value		1,494	1,856
Long-term borrowed funds, carrying value		13,486	11,765
Long-term borrowed funds, fair value		13,525	11,891
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		0	0
Securities held-to-maturity, fair value		0	0
Equity securities, at cost, carrying value		0	0
Equity securities, at cost, fair value		0	0
Other loans held for sale, carrying value		0	0
Other loans held for sale, fair value		0	0
Loans and leases, carrying value		0	0
Loans and leases, fair value		0	0
Deposits, carrying value		0	0
Deposits, fair value		0	0
Federal funds purchased and securities sold under agreements to repurchase, carrying value		0	0
Federal funds purchased and securities sold under agreements to repurchase, fair value		0	0
Other short-term borrowed funds, carrying value		0	0
Other short-term borrowed funds, fair value		0	0
Long-term borrowed funds, carrying value		0	0
Long-term borrowed funds, fair value		0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		4,555	4,685
Securities held-to-maturity, fair value		4,439	4,668
Equity securities, at cost, carrying value		748	722
Equity securities, at cost, fair value		748	722
Other loans held for sale, carrying value		0	0
Other loans held for sale, fair value		0	0
Loans and leases, carrying value		418	393
Loans and leases, fair value		418	393
Deposits, carrying value		115,730	115,089
Deposits, fair value		115,563	115,039
Federal funds purchased and securities sold under agreements to repurchase, carrying value		315	815
Federal funds purchased and securities sold under agreements to repurchase, fair value		315	815
Other short-term borrowed funds, carrying value		1,494	1,856
Other short-term borrowed funds, fair value		1,494	1,856
Long-term borrowed funds, carrying value		13,486	11,765
Long-term borrowed funds, fair value		13,525	11,891
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity, carrying value		0	0
Securities held-to-maturity, fair value		0	0
Equity securities, at cost, carrying value		0	0
Equity securities, at cost, fair value		0	0
Other loans held for sale, carrying value		322	221
Other loans held for sale, fair value		322	221
Loans and leases, carrying value		111,007	110,224
Loans and leases, fair value		110,338	110,775
Deposits, carrying value		0	0
Deposits, fair value		0	0
Federal funds purchased and securities sold under agreements to repurchase, carrying value		0	0
Federal funds purchased and securities sold under agreements to repurchase, fair value		0	0
Other short-term borrowed funds, carrying value		0	0
Other short-term borrowed funds, fair value		0	0
Long-term borrowed funds, carrying value		0	0
Long-term borrowed funds, fair value		$ 0	$ 0
[1]	Excluded from the table above are loans held for sale totaling $800 million and $718 million as of March 31, 2018 and December 31, 2017, respectively.
[2]	Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $20.2 billion and $20.3 billion at March 31, 2018 and December 31, 2017, respectively.

NONINTEREST INCOME - Narrative

NONINTEREST INCOME - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Card fees
Card reward costs	$ 10
Trust and investment services fees
Trailing commission income	$ 4

NONINTEREST INCOME - Noninteres

NONINTEREST INCOME - Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Revenue from contracts with customers	$ 265
Revenue from other sources	106
Total noninterest income	$ 371	$ 379

NONINTEREST INCOME - Components

NONINTEREST INCOME - Components of Revenue from Contracts with Customers (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 265
Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	190
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75
Service charges and fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	124
Service charges and fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	98
Service charges and fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26
Card fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	61
Card fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52
Card fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9
Capital markets fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37
Capital markets fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Capital markets fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37
Trust and investment services fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40
Trust and investment services fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	40
Trust and investment services fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other banking fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3
Other banking fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0
Other banking fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3

NONINTEREST INCOME - Other Inco

NONINTEREST INCOME - Other Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Bank-owned life insurance	$ 14	$ 12

OTHER OPERATING EXPENSE (Detail

OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Deposit insurance	$ 31	$ 32
Promotional expense	25	26
Settlements and operating losses	12	13
Other	52	53
Other operating expense	$ 120	$ 124

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 113	$ 114
Effective income tax rate	22.50%	26.40%
U.S. Federal income tax expense and tax rate	21.00%
Deferred taxes, net	$ 475		$ 571

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator (basic and diluted):
Net income	$ 388	$ 320
Less: Preferred stock dividends	7	7
Net income available to common stockholders	$ 381	$ 313
Denominator:
Weighted-average common shares outstanding - basic (in Shares)	487,500,618	509,451,450
Dilutive common shares: share-based awards (in Shares)	1,766,208	1,896,750
Weighted-average common shares outstanding - diluted (in Shares)	489,266,826	511,348,200
Earnings per common share:
Basic (in Dollars per Share)	$ 0.78	$ 0.61
Diluted (in Dollars per Share)	$ 0.78	$ 0.61
Share-based awards excluded from diluted earnings per share computation (in Shares)	0	322,000

REGULATORY MATTERS - Narrative

REGULATORY MATTERS - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)subsidiary	Mar. 31, 2017USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common share dividends	$ 108	$ 72
Preferred share dividends	7	7
Treasury stock purchased	$ 175	$ 130
Banking Subsidiaries
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of financial subsidiaries | subsidiary	2

REGULATORY MATTERS - Capital an

REGULATORY MATTERS - Capital and Capital Ratio Information (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Common Equity Tier 1 to Risk-Weighted Assets (Amount)
Actual	[1]	$ 14,425	$ 14,309
Minimum Capital Adequacy	[1]	8,228	7,342
Classification as Well-capitalized	[1],[2]	$ 8,389	$ 8,300
Common Equity Tier 1 to Risk-Weighted Assets (Ratio)
Actual	[1]	11.20%	11.20%
Common Equity Tier1 Required For Capital Adequacy To Risk Weighted Assets	[1],[3]	6.375%	5.75%
Common Equity Tier 1 Required To Be Well Capitalized To Risk Weighted Assets	[1],[2]	6.50%	6.50%
Tier 1 Capital to Risk-Weighted Assets (Amount)
Actual	[4]	$ 14,672	$ 14,556
Minimum Capital Adequacy	[4]	10,164	9,258
Classification as Well-capitalized	[2],[4]	$ 10,325	$ 10,215
Tier 1 Capital to Risk-Weighted Assets (Ratio)
Actual	[4]	11.40%	11.40%
Minimum Capital Adequacy	[3],[4]	7.875%	7.25%
Classification as Well-capitalized	[2],[4]	8.00%	8.00%
Total Capital to Risk-Weighted Assets (Amount)
Actual	[5]	$ 17,905	$ 17,781
Minimum Capital Adequacy	[5]	12,745	11,812
Classification as Well-capitalized	[2],[5]	$ 12,907	$ 12,769
Total Capital to Risk-Weighted Assets (Ratio)
Actual	[5]	13.90%	13.90%
Minimum Capital Adequacy	[3],[5]	9.875%	9.25%
Classification as Well-capitalized	[2],[5]	10.00%	10.00%
Tier 1 Capital to Average Assets (Leverage) (Amount)
Actual	[6]	$ 14,672	$ 14,556
Minimum Capital Adequacy	[6]	5,858	5,824
Classification as Well-capitalized	[2],[6]	$ 7,322	$ 7,280
Tier 1 Capital to Average Assets (Leverage) (Ratio)
Actual	[6]	10.00%	10.00%
Minimum Capital Adequacy	[3],[6]	4.00%	4.00%
Classification as Well-capitalized	[2],[6]	5.00%	5.00%
Capital Conservation Buffer		1.875%	1.25%
[1]	“Common equity tier 1 capital ratio” represents CET1 capital divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach.
[2]	Presented for informational purposes. Prompt corrective action provisions apply only to the Company’s insured depository institutions - CBNA and CBPA.
[3]	“Minimum Capital ratio” includes capital conservation buffer of 1.875% for 2018 and 1.250% for 2017; N/A to Tier 1 leverage.
[4]	“Tier 1 capital ratio” is tier 1 capital, which includes CET1 capital plus non-cumulative perpetual preferred equity that qualifies as additional tier 1 capital, divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach.
[5]	“Total capital ratio” is total capital divided by total risk-weighted assets as defined under U.S. Basel III Standardized approach.
[6]	“Tier 1 leverage ratio” is tier 1 capital divided by quarterly average total assets as defined under U.S. Basel III Standardized approach.

BUSINESS OPERATING SEGMENTS - N

BUSINESS OPERATING SEGMENTS - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)segment	Mar. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of segments | segment	2
Revenues	$ 1,462	$ 1,384
Consumer Banking | Maximum
Segment Reporting Information [Line Items]
Revenues	25
Commercial Banking | Minimum
Segment Reporting Information [Line Items]
Revenues	25
Commercial Banking | Maximum
Segment Reporting Information [Line Items]
Revenues	$ 2,500

BUSINESS OPERATING SEGMENTS (De

BUSINESS OPERATING SEGMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 1,091	$ 1,005
Noninterest income	371	379
Total revenue	1,462	1,384
Noninterest expense	883	854
Profit before provision for credit losses	579	530
Provision for credit losses	78	96
Income before income tax expense	501	434
Income tax expense	113	114
NET INCOME	388	320
Total average assets	151,523	148,786
Operating Segments | Consumer Banking
Segment Reporting Information [Line Items]
Net interest income	733	638
Noninterest income	222	220
Total revenue	955	858
Noninterest expense	656	647
Profit before provision for credit losses	299	211
Provision for credit losses	72	64
Income before income tax expense	227	147
Income tax expense	57	52
NET INCOME	170	95
Total average assets	61,348	58,660
Operating Segments | Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	357	346
Noninterest income	125	134
Total revenue	482	480
Noninterest expense	208	190
Profit before provision for credit losses	274	290
Provision for credit losses	(4)	19
Income before income tax expense	278	271
Income tax expense	63	91
NET INCOME	215	180
Total average assets	50,393	49,243
Other Non-Segment
Segment Reporting Information [Line Items]
Net interest income	1	21
Noninterest income	24	25
Total revenue	25	46
Noninterest expense	19	17
Profit before provision for credit losses	6	29
Provision for credit losses	10	13
Income before income tax expense	(4)	16
Income tax expense	(7)	(29)
NET INCOME	3	45
Total average assets	$ 39,782	$ 40,883