Ally Financial (ALLY) 10-Q 1 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 30, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-3754
Entity Registrant Name	ALLY FINANCIAL INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-0572512
Entity Address, Address Description	Ally Detroit Center
Entity Address, Address Line One	500 Woodward Ave
Entity Address, Address Line Two	Floor 10
Entity Address, City or Town	Detroit
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48226
City Area Code	866
Local Phone Number	710-4623
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		390,415,331
Entity Central Index Key	0000040729
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock
Entity Information [Line Items]
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	ALLY
Trust Preferred Securities
Entity Information [Line Items]
Security Exchange Name	NYSE
Title of 12(b) Security	8.125% Fixed Rate/Floating Rate Trust Preferred Securities, Series 2 of GMAC Capital Trust I
Trading Symbol	ALLY PRA

Condensed Consolidated Statemen

Condensed Consolidated Statement of Comprehensive Income Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Revenue and Other Income [Line Items]
Interest and fees on finance receivables and loans	$ 1,860	$ 1,647	$ 3,667	$ 3,190
Interest on loans held-for-sale	3	6	5	6
Interest and Dividends on investment securities	244	188	484	364
Interest on cash and cash equivalents	21	17	44	32
Operating Lease, Lease Income	363	374	724	756
Total financing revenue and other interest income	2,491	2,232	4,924	4,348
Interest Expense [Abstract]
Interest on deposits	651	399	1,243	750
Interest on short-term borrowings	37	40	81	72
Interest on long-term debt	407	434	826	845
Total interest expense	1,095	873	2,150	1,667
Net depreciation expense on operating lease assets	239	265	485	538
Net financing revenue and other interest income	1,157	1,094	2,289	2,143
Other revenue [Abstract]
Insurance premiums and service revenue earned	261	239	522	495
Gain on mortgage and automotive loans, net	2	1	12	2
Other gain (loss) on investments, net	39	27	147	15
Other income, net of losses	93	97	180	206
Total other revenue	395	364	861	718
Total net revenue	1,552	1,458	3,150	2,861
Provision for loan losses	177	158	459	419
Noninterest Expense [Abstract]
Compensation and benefits expense	296	292	614	598
Insurance losses and loss adjustment expenses	127	101	186	164
Other operating expenses	458	446	911	891
Total noninterest expense	881	839	1,711	1,653
Income from continuing operations before income tax (benefit) expense	494	461	980	789
Statement [Abstract]
Income tax expense from continuing operations	(90)	113	21	189
Net income from continuing operations	584	348	959	600
(Loss) income from discontinued operations, net of tax	(2)	1	(3)	(1)
Net income	582	349	956	599
Other Comprehensive Income (Loss), Net of Tax	309	(70)	615	(398)
Comprehensive income	$ 891	$ 279	$ 1,571	$ 201
Earnings Per Share, Basic [Abstract]
Net income from continuing operations, basic earnings per common share	$ 1.47	$ 0.81	$ 2.39	$ 1.38
Loss from discontinued operations, net of tax, basic earnings per common share	0	0	(0.01)	0
Net income, basic earnings per common share	1.46	0.81	2.39	1.38
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations, diluted earnings per common share	1.46	0.80	2.38	1.38
Loss from discontinued operations, net of tax, diluted earnings per common share	0	0	(0.01)	0
Net income, diluted earnings per common share	1.46	0.81	2.37	1.37
Cash dividends declared per common share	$ 0.17	$ 0.13	$ 0.34	$ 0.26

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 659	$ 810
Cash and cash equivalents, interest-bearing	2,904	3,727
Total cash and cash equivalents	3,563	4,537
Equity securities	591	773
Available-for-sale securities	28,688	25,303
Held-to-maturity securities	2,461	2,362
Loans held-for-sale, net	275	314
Finance receivables and loans, net of unearned income	129,210	129,926
Finance receivables and loans, net [Abstract]
Allowance for loan losses	1,282	1,242
Total finance receivables and loans, net	127,928	128,684
Investment in operating leases, net	8,407	8,417
Premiums receivable and other insurance assets	2,460	2,326
Other assets	6,075	6,153
Total assets	180,448	178,869
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	162	142
Deposit liabilities, interest-bearing	116,163	106,036
Total deposit liabilities	116,325	106,178
Short-term borrowings	6,519	9,987
Long-term debt	37,466	44,193
Interest payable	744	523
Unearned insurance premiums and service revenue	3,171	3,044
Accrued Liabilities and Other Liabilities	1,907	1,676
Total liabilities	166,132	165,601
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital	21,403	21,345
Accumulated deficit	(4,682)	(5,489)
Accumulated other comprehensive loss	84	(539)
Treasury stock, at cost	(2,489)	(2,049)
Total equity	14,316	13,268
Total liabilities and equity	180,448	178,869
Variable interest entity
Assets [Abstract]
Finance receivables and loans, net of unearned income	16,101	18,086
Finance receivables and loans, net [Abstract]
Allowance for loan losses	98	114
Total finance receivables and loans, net	16,003	17,972
Investment in operating leases, net	90	164
Other assets	614	767
Total assets	16,707	18,903
Liabilities and Equity [Abstract]
Long-term debt	9,030	10,482
Accrued Liabilities and Other Liabilities	11	12
Total liabilities	$ 9,041	$ 10,494

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheet & Mini Balance Sheet (Paranthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	1,100,000,000	1,100,000,000
Common stock, shares issued	496,560,246	492,797,409
Common stock, shares outstanding	392,775,052	404,899,599
Treasury stock, shares	96,010,516	87,897,810
Held-to-maturity securities, fair value	$ 2,374	$ 2,307

Condensed Consolidated Statem_2

Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Common stock and paid-in capital	Accumulated Deficit	Accumulated other comprehensive (loss) income	Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity	$ 13,494	$ 21,245	$ (6,406)	$ (235)	$ (1,110)
Common stock dividends, amount per share	$ 0.26
Net income	$ 599		599
Share-based compensation	58	58
Other comprehensive income (loss)	398			398
Common stock repurchases	(380)				(380)
Common stock dividends	(115)		(115)
Equity	$ 13,082	21,273	(6,318)	(578)	(1,295)
Common stock dividends, amount per share	$ 0.13
Net income	$ 349		349
Share-based compensation	30	30
Other comprehensive income (loss)	70			70
Common stock repurchases	(195)				(195)
Common stock dividends	(57)		(57)
Equity	13,139	21,303	(6,026)	(648)	(1,490)
Equity	$ 13,268	21,345	(5,489)	(539)	(2,049)
Common stock dividends, amount per share	$ 0.34
Net income	$ 956		956
Share-based compensation	58	58
Other comprehensive income (loss)	(615)			(615)
Common stock repurchases	(440)				(440)
Common stock dividends	(139)		(139)
Equity	$ 13,699	21,379	(5,195)	(225)	(2,260)
Common stock dividends, amount per share	$ 0.17
Net income	$ 582		582
Share-based compensation	24	24
Other comprehensive income (loss)	(309)			(309)
Common stock repurchases	(229)				(229)
Common stock dividends	(69)		(69)
Equity	$ 14,316	$ 21,403	$ (4,682)	$ 84	$ (2,489)

Condensed Consolidated Statem_3

Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Net income	$ 956	$ 599
Net Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization	752	865
Provision for loan losses	459	419
Gain on mortgage and automotive loans, net	(12)	(2)
Other gain on investments, net	(147)	(15)
Originations and purchases of loans held-for-sale	(528)	(730)
Proceeds from Sale and Collection of Loans Held-for-sale	335	512
Increase (decrease) in deferred income taxes	1	192
Increase (decrease) in interest payable	221	193
Increase (decrease) in other operating assets	(21)	(25)
Increase (decrease) in other operating liabilities	(114)	(24)
Increase (decrease) in other operating assets and liabilities, net	(58)	25
Net cash provided by operating activities	1,844	2,009
Net Cash (Used in) Provided by Investing Activities [Abstract]
Purchases of equity securities	(210)	(500)
Proceeds from sales of equity securities	511	535
Purchases of available-for-sale securities	7,018	4,094
Proceeds from sales of available-for-sale securities	2,568	390
Proceeds from repayments of available-for-sale securities	1,805	1,621
Purchases of held-to-maturity securities	(268)	(316)
Proceeds from repayments of held-to-maturity securities	107	72
Purchases of finance receivables and loans held-for-investment	(2,386)	(2,611)
Proceeds from sales of finance receivables and loans initially held-for-investment	159	0
Originations and repayments of finance receivables and loans held-for-investment and other, net	2,769	(638)
Purchases of operating lease assets	(1,769)	(2,107)
Disposals of operating lease assets	1,321	1,763
Net change in nonmarketable equity investments	113	(46)
Payments for (proceeds from) other, net	(209)	(186)
Net cash used in investing activities	(2,507)	(6,117)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	(3,468)	(4,305)
Net increase in deposits	10,133	5,441
Proceeds from issuance of long-term debt	4,590	12,940
Repayments of long-term debt	(11,372)	(9,800)
Repurchase of common stock	(440)	(380)
Dividends paid	(139)	(115)
Net cash (used in) provided by financing activities	(696)	3,781
Effect of exchange-rate changes on cash and cash equivalents and restricted cash	3	(3)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Net decrease in cash and cash equivalents and restricted cash	(1,356)	(330)
Cash and cash equivalents and restricted cash	5,626	5,269
Cash and cash equivalents and restricted cash	4,270	4,939
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	1,884	1,455
Cash paid for income taxes	24	17
Loans held-for-sale transferred to finance receivables and loans held-for-investment	125	0
Finance receivables and loans transferred to loans held-for-sale, noncash	20	0
Proceeds from repayments of mortgage loans held-for-investment originally designated as held-for-sale	7	12
Restricted Cash [Abstract]
Cash and cash equivalents as disclosed on the Condensed Consolidated Balance Sheet	3,563	3,924
Restricted cash included in other assets on the Condensed Consolidated Balance Sheet	$ 707	$ 1,015

Description of Business, Basis

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]	Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Ally Financial Inc. (together with its consolidated subsidiaries unless the context otherwise requires, Ally, the Company, or we, us, or our) is a leading digital financial-services company . As a customer-centric company with passionate customer service and innovative financial solutions, we are relentlessly focused on “Doing It Right” and being a trusted financial-services provider to our consumer, commercial, and corporate customers. We are one of the largest full-service automotive finance operations in the country and offer a wide range of financial services and insurance products to dealerships and consumers. Our award-winning online bank (Ally Bank, Member FDIC and Equal Housing Lender) offers mortgage-lending services and a variety of deposit and other banking products, including savings, money-market, and checking accounts, certificates of deposit (CDs), and individual retirement accounts (IRAs). Additionally, we offer securities-brokerage and investment-advisory services through Ally Invest. Our robust corporate finance business offers capital for equity sponsors and middle-market companies . We are a Delaware corporation and are registered as a bank holding company (BHC) under the Bank Holding Company Act of 1956, as amended , and a financial holding company (FHC) under the Gramm-Leach-Bliley Act of 1999, as amended . Our accounting and reporting policies conform to accounting principles generally accepted in the United States of America (GAAP). Additionally, where applicable, the policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. 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 and disclosure of contingent assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, valuations of automotive lease assets and residuals, fair value of financial instruments, and the determination of the provision for income taxes. The Condensed Consolidated Financial Statements at June 30, 2019 , and for the three months and six months ended June 30, 2019 , and 2018 , are unaudited but reflect all adjustments that are, in management’s opinion, necessary for the fair presentation of the results for the interim periods presented. All such adjustments are of a normal recurring nature. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements (and the related Notes) included in our Annual Report on Form 10-K for the year ended December 31, 2018 , as filed on February 20, 2019, with the U.S. Securities and Exchange Commission (SEC). Significant Accounting Policies Lease Accounting At contract inception, we determine whether the contract is or contains a lease based on the terms and conditions of the contract. Lease contracts are recognized on our Condensed Consolidated Balance Sheet as right-of-use (ROU) assets and lease liabilities; however, we have elected not to recognize ROU assets and lease liabilities on real estate leases with terms of one year or less. Lease liabilities and their corresponding ROU assets are recorded based on the present value of the future lease payments over the expected lease term. As the interest rate implicit in the lease contract is typically not readily determinable, we utilize our incremental borrowing rate, which is the rate we would incur to borrow on a collateralized basis over a similar term on an amount equal to the lease payments in a similar economic environment. The ROU asset also includes initial direct costs paid less lease incentives received from the lessor. Our lease contracts are generally classified as operating and, as a result, we recognize a single lease cost within other operating expenses on the income statement on a straight-line basis over the lease term. This update to our accounting policy resulted from our adoption of Accounting Standards Update (ASU) 2016-02 on January 1, 2019, as further described within the section below titled Recently Adopted Accounting Standards . Investments Premiums on debt securities that have noncontingent call features that are callable at fixed prices on preset dates are amortized to the earliest call date as an adjustment to investment yield. All other premiums and discounts on debt securities are amortized over the stated maturity of the security as an adjustment to investment yield. This method of amortization differs from that described in Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K , which describes our full accounting policy for Investments. This update to our amortization methodology resulted from the adoption of ASU 2017-08 on January 1, 2019, as further described within the section below titled Recently Adopted Accounting Standards . Income Taxes In calculating the provision for interim income taxes, in accordance with Accounting Standards Codification (ASC) 740, Income Taxes , we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K regarding additional significant accounting policies. Recently Adopted Accounting Standards Leases (ASU 2016-02) In February 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02. The amendments in this update primarily replaced the existing accounting requirements for operating leases for lessees. Lessee accounting requirements for finance leases (previously referred to as capital leases) and lessor accounting requirements for operating leases and sales type and direct financing leases were largely unchanged. The amendments require the lessee of an operating lease to record a balance sheet gross-up upon lease commencement by recognizing a ROU asset and lease liability equal to the present value of the lease payments. The ROU asset and lease liability should be derecognized in a manner that effectively yields a straight line lease expense over the lease term. In addition to the changes to the lessee operating lease accounting requirements, the amendments also changed the types of costs that can be capitalized related to a lease agreement for both lessees and lessors. The amendments also require additional disclosures for all lease types for both lessees and lessors. The FASB issued additional ASUs to clarify the guidance and provide certain practical expedients and an additional transition option. We adopted ASU 2016-02 and the subsequent ASUs that modified ASU 2016-02 (collectively, the amendments) on January 1, 2019. This includes the early adoption of ASU 2019-01, which was issued in March 2019 to amend certain provisions included in ASU 2016-02. We adopted this guidance using the modified retrospective approach on January 1, 2019, and have not adjusted prior period comparative information and will continue to disclose prior period financial information in accordance with the previous lease accounting guidance. We have elected certain practical expedients permitted within the amendments that allowed us to not reassess (i) current lease classifications, (ii) whether existing contracts meet the definition of a lease under the amendments to the lease guidance, and (iii) whether current initial direct costs meet the new criteria for capitalization, for all existing leases as of the adoption date. We made an accounting policy election to calculate the impact of adoption using the remaining minimum lease payments and remaining lease term for each contract that was identified as a lease, discounted at our incremental borrowing rate as of the adoption date. The adoption of the amendments resulted in a ROU asset of approximately $161 million from operating leases for our various corporate facilities, a $29 million reduction to accrued expenses and other liabilities for accrued rent and unamortized tenant improvement allowances, and a lease liability of approximately $190 million . The adoption did not change our previously reported Condensed Consolidated Statements of Comprehensive Income and did not result in a cumulative catch-up adjustment to opening retained earnings. Receivables—Nonrefundable Fees and Other Costs: Premium Amortization on Purchased Callable Debt Securities (ASU 2017-08) In March 2017, the FASB issued ASU 2017-08. The amendments in this update require premiums on purchased callable debt securities to be amortized to the security’s earliest call date. Prior to this ASU, premiums and discounts on purchased callable debt securities were generally required to be amortized to the security’s maturity date. The amendments do not require an accounting change for securities held at a discount. We adopted the amendments on January 1, 2019, on a modified retrospective basis, which resulted in an increase to our accumulated deficit of $10 million , net of income taxes, partially offset by an $8 million decrease to accumulated other comprehensive loss, net of income taxes. Recently Issued Accounting Standards Financial Instruments—Credit Losses (ASU 2016-13) In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (CECL). The amendments in this update introduce a new accounting model to measure credit losses for financial assets measured at amortized cost. The FASB has also issued additional ASUs to clarify the scope and provide additional guidance for ASU 2016-13. Credit losses for financial assets measured at amortized cost should be determined based on the total current expected credit losses over the life of the financial asset or group of financial assets. In effect, the financial asset or group of financial assets should be presented at the net amount expected to be collected. Credit losses will no longer be recorded under the current incurred loss model for financial assets measured at amortized cost. The amendments also modify the accounting for available-for-sale debt securities whereby credit losses will be recorded through an allowance for credit losses rather than a write-down to the security’s cost basis, which allows for reversals of credit losses when estimated credit losses decline. Credit losses for available-for-sale debt securities should be measured in a manner similar to current GAAP. The amendments are effective on January 1, 2020, and must be applied using a modified retrospective approach with a cumulative-effect adjustment through retained earnings as of the beginning of the fiscal year upon adoption as required. The new accounting model for credit losses represents a significant departure from existing GAAP, and will materially increase the allowance for credit losses on our finance receivables and loans, with a resulting negative adjustment to retained earnings. We expect that our consumer automotive loan portfolio will generate the majority of this increase. The amount of the change in the allowance for credit losses will also be impacted by the composition of our portfolio at the adoption date, as well as economic conditions and forecasts at that time. While the standard modifies the measurement of the allowance for credit losses, it does not alter the credit risk of our loan portfolios. Additionally, we currently expect to phase in the day-one impact of CECL into regulatory capital over a period of three years, as further described in Note 16 . Management created a cross-functional working group to govern the implementation of these amendments, including consideration of model development, data integrity, technology, reporting and disclosure requirements, key accounting interpretations, control environment, and corporate governance. We are in the process of validating and testing the models and procedures that will be used to calculate the credit loss reserves in accordance with these amendments. We performed limited parallel runs during the first two quarters of 2019, and will continue to refine and enhance our estimation process with additional parallel testing throughout 2019. Additionally, we do not expect a material allowance for credit losses on our debt securities as a result of the standard based upon the current composition of our portfolio.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Our primary revenue sources, which include financing revenue and other interest income, are addressed by other GAAP and are not in the scope of ASC 606, Revenue from Contracts with Customers. As part of our Insurance operations, we recognize revenue from insurance contracts, which are addressed by other GAAP and are not included in the scope of this standard. Certain noninsurance contracts within our Insurance operations, including vehicle service contracts (VSCs), guaranteed asset protection (GAP) contracts, and vehicle maintenance contracts (VMCs), are included in the scope of this standard. All revenue associated with noninsurance contracts is recognized over the contract term on a basis proportionate to the anticipated cost emergence. Further, commissions and sales expense incurred to obtain these contracts are amortized over the terms of the related policies and service contracts on the same basis as premiums and service revenue are earned, and all advertising costs are recognized as expense when incurred. The following tables present a disaggregated view of our revenue from contracts with customers included in other revenue that falls within the scope of the revenue recognition principles of ASC 606, Revenue from Contracts with Customers . For further information regarding our revenue recognition policies and details about the nature of our respective revenue streams, refer to Note 1 and Note 3 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K . Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2019 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 134 $ — $ — $ — $ 134 Remarketing fee income 19 — — — — 19 Brokerage commissions and other revenue — — — — 17 17 Deposit account and other banking fees — — — — 4 4 Brokered/agent commissions — 4 — — — 4 Other 5 — — — — 5 Total revenue from contracts with customers 24 138 — — 21 183 All other revenue 37 148 4 10 13 212 Total other revenue (d) $ 61 $ 286 $ 4 $ 10 $ 34 $ 395 2018 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 125 $ — $ — $ — $ 125 Remarketing fee income 21 — — — — 21 Brokerage commissions and other revenue — — — — 15 15 Brokered/agent commissions — 4 — — — 4 Deposit account and other banking fees — — — — 3 3 Other 4 — — — — 4 Total revenue from contracts with customers 25 129 — — 18 172 All other revenue 38 137 2 14 1 192 Total other revenue (d) $ 63 $ 266 $ 2 $ 14 $ 19 $ 364 (a) We had opening balances of $2.7 billion and $2.5 billion in unearned revenue associated with outstanding contracts at April 1, 2019, and April 1, 2018, respectively, and $202 million and $195 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the three months ended June 30, 2019 , and June 30, 2018 , respectively. (b) At June 30, 2019 , we had unearned revenue of $2.8 billion associated with outstanding contracts, and with respect to this balance we expect to recognize revenue of $380 million during the remainder of 2019 , $705 million in 2020 , $605 million in 2021 , $473 million in 2022 , and $595 million thereafter. At June 30, 2018 , we had unearned revenue of $2.6 billion associated with outstanding contracts. (c) We had deferred insurance assets of $1.6 billion at both April 1, 2019, and June 30, 2019 , and recognized $114 million of expense during the three months ended June 30, 2019 . We had deferred insurance assets of $1.4 billion and $1.5 billion at April 1, 2018, and June 30, 2018 , respectively, and recognized $106 million of expense during the three months ended June 30, 2018 . (d) Represents a component of total net revenue. Refer to Note 21 for further information on our reportable operating segments. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2019 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 265 $ — $ — $ — $ 265 Remarketing fee income 37 — — — — 37 Brokerage commissions and other revenue — — — — 34 34 Deposit account and other banking fees — — — — 9 9 Brokered/agent commissions — 7 — — — 7 Other 10 — — — — 10 Total revenue from contracts with customers 47 272 — — 43 362 All other revenue 82 374 6 21 16 499 Total other revenue (c) $ 129 $ 646 $ 6 $ 21 $ 59 $ 861 2018 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 248 $ — $ — $ — $ 248 Remarketing fee income 44 — — — — 44 Brokerage commissions and other revenue — — — — 31 31 Brokered/agent commissions — 8 — — — 8 Deposit account and other banking fees — — — — 6 6 Other 6 1 — — — 7 Total revenue from contracts with customers 50 257 — — 37 344 All other revenue 79 255 3 22 15 374 Total other revenue (c) $ 129 $ 512 $ 3 $ 22 $ 52 $ 718 (a) We had opening balances of $2.6 billion and $2.5 billion in unearned revenue associated with outstanding contracts at January 1, 2019, and January 1, 2018, respectively, and $401 million and $389 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the six months ended June 30, 2019 , and June 30, 2018 , respectively. (b) We had deferred insurance assets of $1.5 billion and $1.6 billion at January 1, 2019, and June 30, 2019 , respectively, and recognized $225 million of expense during the six months ended June 30, 2019 . We had deferred insurance assets of $1.4 billion and $1.5 billion at January 1, 2018, and June 30, 2018 , respectively, and recognized $209 million of expense during the six months ended June 30, 2018 . (c) Represents a component of total net revenue. Refer to Note 21 for further information on our reportable operating segments. In addition to the components of other revenue presented above, as part of our Automotive Finance operations, we recognized net remarketing gains of $23 million and $38 million for the three months and six months ended June 30, 2019 , respectively, and $16 million and $34 million for the three months and six months ended , June 30, 2018, on the sale of off-lease vehicles. These gains are included in depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income .

Other Income, Net of Losses

Other Income, Net of Losses	6 Months Ended
	Jun. 30, 2019
Other Nonoperating Income (Expense) [Abstract]
Other Income and Other Expense Disclosure	Other Income, Net of Losses Details of other income, net of losses, were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Late charges and other administrative fees $ 28 $ 25 $ 57 $ 54 Remarketing fees 19 21 37 44 Income from equity-method investments 8 7 12 13 Servicing fees 4 8 10 16 Other, net 34 36 64 79 Total other income, net of losses $ 93 $ 97 $ 180 $ 206

Reserves for Insurance Losses a

Reserves for Insurance Losses and Loss Adjustment Expenses Reserves for Insurance Losses and Loss Adjustment Expenses	6 Months Ended
	Jun. 30, 2019
Reserves for Insurance Losses and Loss Adjustment Expenses [Abstract]
Reserves for Insurance Losses and Loss Adjustment Expenses	Reserves for Insurance Losses and Loss Adjustment Expenses The following table shows a rollforward of our reserves for insurance losses and loss adjustment expenses. ($ in millions) 2019 2018 Total gross reserves for insurance losses and loss adjustment expenses at January 1, $ 134 $ 140 Less: Reinsurance recoverable 96 108 Net reserves for insurance losses and loss adjustment expenses at January 1, 38 32 Net insurance losses and loss adjustment expenses incurred related to: Current year 186 159 Prior years (a) — 5 Total net insurance losses and loss adjustment expenses incurred 186 164 Net insurance losses and loss adjustment expenses paid or payable related to: Current year (134 ) (121 ) Prior years (27 ) (26 ) Total net insurance losses and loss adjustment expenses paid or payable (161 ) (147 ) Net reserves for insurance losses and loss adjustment expenses at June 30, 63 49 Plus: Reinsurance recoverable 90 100 Total gross reserves for insurance losses and loss adjustment expenses at June 30, $ 153 $ 149 (a) There have been no material adverse changes to the reserve for prior years.

Other Operating Expenses

Other Operating Expenses	6 Months Ended
	Jun. 30, 2019
Operating Expenses [Abstract]
Other Operating Income and Expense	Other Operating Expenses Details of other operating expenses were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Insurance commissions $ 117 $ 109 $ 231 $ 219 Technology and communications 73 74 150 145 Advertising and marketing 35 29 83 68 Lease and loan administration 43 40 82 82 Professional services 30 35 59 67 Regulatory and licensing fees 28 35 56 65 Vehicle remarketing and repossession 25 26 52 58 Premises and equipment depreciation 25 22 47 42 Occupancy 16 11 29 22 Non-income taxes 11 6 20 14 Amortization of intangible assets 3 3 6 6 Other 52 56 96 103 Total other operating expenses $ 458 $ 446 $ 911 $ 891

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure	Investment Securities Our investment portfolio includes various debt and equity securities. Our debt securities, which are classified as available-for-sale or held-to-maturity, include government securities, corporate bonds, asset-backed securities, and mortgage-backed securities. The cost, fair value, and gross unrealized gains and losses on available-for-sale and held-to-maturity debt securities were as follows. June 30, 2019 December 31, 2018 Amortized cost Gross unrealized Fair value Amortized cost Gross unrealized Fair value ($ in millions) gains losses gains losses Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 2,023 $ 7 $ (12 ) $ 2,018 $ 1,911 $ — $ (60 ) $ 1,851 U.S. States and political subdivisions 585 13 — 598 816 3 (17 ) 802 Foreign government 146 3 — 149 145 1 (1 ) 145 Agency mortgage-backed residential 18,971 191 (62 ) 19,100 17,486 47 (395 ) 17,138 Mortgage-backed residential 2,927 18 (11 ) 2,934 2,796 1 (111 ) 2,686 Agency mortgage-backed commercial 1,303 48 — 1,351 3 — — 3 Mortgage-backed commercial 712 2 (1 ) 713 715 1 (2 ) 714 Asset-backed 473 4 — 477 723 2 (2 ) 723 Corporate debt 1,326 25 (3 ) 1,348 1,286 1 (46 ) 1,241 Total available-for-sale securities (a) (b) (c) $ 28,466 $ 311 $ (89 ) $ 28,688 $ 25,881 $ 56 $ (634 ) $ 25,303 Held-to-maturity securities Debt securities Agency mortgage-backed residential (d) $ 2,430 $ 41 $ (3 ) $ 2,468 $ 2,319 $ 6 $ (61 ) $ 2,264 Asset-backed retained notes 31 — — 31 43 — — 43 Total held-to-maturity securities $ 2,461 $ 41 $ (3 ) $ 2,499 $ 2,362 $ 6 $ (61 ) $ 2,307 (a) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $12 million at both June 30, 2019 , and December 31, 2018 , respectively. (b) Certain available-for-sale securities are included in fair value hedging relationships. Refer to Note 17 for additional information. (c) Available-for-sale securities with a fair value of $4.4 billion and $9.2 billion at June 30, 2019 , and December 31, 2018 , respectively, were pledged to secure advances from the Federal Home Loan Bank (FHLB), short-term borrowings or repurchase agreements, or for other purposes as required by contractual obligation or law. Under these agreements, we have granted the counterparty the right to sell or pledge $615 million and $821 million of the underlying investment securities at June 30, 2019 , and December 31, 2018 , respectively. (d) Held-to-maturity securities with a fair value of $1.3 billion and $1.2 billion at June 30, 2019 , and December 31, 2018, respectively, were pledged to secure advances from the FHLB. The maturity distribution of debt securities outstanding is summarized in the following tables. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2019 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 2,018 1.7 % $ 73 2.0 % $ 1,430 1.6 % $ 515 1.8 % $ — — % U.S. States and political subdivisions 598 3.1 33 3.3 47 2.3 153 2.8 365 3.4 Foreign government 149 2.3 4 1.2 67 2.2 78 2.4 — — Agency mortgage-backed residential 19,100 3.4 — — — — 50 1.9 19,050 3.4 Mortgage-backed residential 2,934 3.3 — — — — — — 2,934 3.3 Agency mortgage-backed commercial 1,351 3.1 — — 3 3.2 932 3.1 416 3.1 Mortgage-backed commercial 713 3.7 — — — — 36 3.9 677 3.7 Asset-backed 477 3.4 — — 328 3.4 74 3.9 75 3.1 Corporate debt 1,348 3.2 143 3.0 549 3.0 634 3.4 22 5.6 Total available-for-sale securities $ 28,688 3.2 $ 253 2.7 $ 2,424 2.2 $ 2,472 2.9 $ 23,539 3.4 Amortized cost of available-for-sale securities $ 28,466 $ 253 $ 2,420 $ 2,412 $ 23,381 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 2,430 3.2 % $ — — % $ — — % $ — — % $ 2,430 3.2 % Asset-backed retained notes 31 3.1 — — 31 2.1 — — — — Total held-to-maturity securities $ 2,461 3.2 $ — — $ 31 2.1 $ — — $ 2,430 3.2 December 31, 2018 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 1,851 1.9 % $ 12 1.0 % $ 1,277 1.8 % $ 562 2.0 % $ — — % U.S. States and political subdivisions 802 3.0 49 1.9 43 2.3 252 2.6 458 3.4 Foreign government 145 2.4 18 3.1 60 2.3 67 2.4 — — Agency mortgage-backed residential 17,138 3.3 — — — — 54 1.9 17,084 3.3 Mortgage-backed residential 2,686 3.3 — — — — — — 2,686 3.3 Agency mortgage-backed commercial 3 3.1 — — 3 3.1 — — — — Mortgage-backed commercial 714 3.8 — — — — 46 3.9 668 3.8 Asset-backed 723 3.5 — — 478 3.4 121 4.0 124 3.3 Corporate debt 1,241 3.1 144 2.8 496 2.9 581 3.3 20 5.5 Total available-for-sale securities $ 25,303 3.2 $ 223 2.6 $ 2,357 2.4 $ 1,683 2.8 $ 21,040 3.3 Amortized cost of available-for-sale securities $ 25,881 $ 224 $ 2,405 $ 1,743 $ 21,509 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 2,319 3.2 % $ — — % $ — — % $ — — % $ 2,319 3.2 % Asset-backed retained notes 43 2.0 — — 42 2.0 1 3.3 — — Total held-to-maturity securities $ 2,362 3.2 $ — — $ 42 2.0 $ 1 3.3 $ 2,319 3.2 (a) Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses. The balances of cash equivalents were $129 million and $35 million at June 30, 2019 , and December 31, 2018 , respectively, and were composed primarily of money-market accounts and short-term securities, including U.S. Treasury bills. The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Taxable interest $ 220 $ 164 $ 434 $ 318 Taxable dividends 3 3 6 6 Interest and dividends exempt from U.S. federal income tax 4 6 9 12 Interest and dividends on investment securities $ 227 $ 173 $ 449 $ 336 The following table presents gross gains and losses realized upon the sales of available-for-sale securities, and net gains or losses on equity securities held during the period. There were no other-than-temporary impairments of available-for-sale securities for the periods presented. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Available-for-sale securities Gross realized gains $ 24 $ 1 $ 34 $ 7 Gross realized losses (a) — — (1 ) — Net realized gains on available-for-sale securities 24 1 33 7 Net realized gain on equity securities 10 18 39 40 Net unrealized gain (loss) on equity securities 5 8 75 (32 ) Other gain on investments, net $ 39 $ 27 $ 147 $ 15 (a) Certain available-for-sale securities were sold at a loss during the three months and six months ended June 30, 2019 , and June 30, 2018 , as a result of market conditions within these periods (e.g., a downgrade in the rating of a debt security) or a loss was realized based on corporate actions outside of our control (such as a call by the issuer). Any such sales were made in accordance with our risk-management policies and practices. The table below summarizes available-for-sale and held-to-maturity securities in an unrealized loss position, which we evaluated for other than temporary impairment. For additional information on our methodology, refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K. As of June 30, 2019 , we did not have the intent to sell the available-for-sale or held-to-maturity securities with an unrealized loss position and we do not believe it is more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result of this evaluation, we believe that the securities with an unrealized loss position are not considered to be other-than-temporarily impaired at June 30, 2019 . June 30, 2019 December 31, 2018 Less than 12 months 12 months or longer Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ — $ — $ 1,532 $ (12 ) $ 31 $ — $ 1,758 $ (60 ) U.S. States and political subdivisions — — 46 — 259 (3 ) 317 (14 ) Foreign government 5 — 8 — 6 — 74 (1 ) Agency mortgage-backed residential 1,033 (1 ) 5,713 (61 ) 5,537 (94 ) 7,808 (301 ) Mortgage-backed residential 26 — 1,235 (11 ) 1,024 (20 ) 1,360 (91 ) Agency mortgage-backed commercial 10 — — — — — — — Mortgage-backed commercial 280 (1 ) — — 347 (1 ) 36 (1 ) Asset-backed 6 — 75 — 294 (1 ) 124 (1 ) Corporate debt 35 — 256 (3 ) 576 (19 ) 569 (27 ) Total temporarily impaired available-for-sale securities $ 1,395 $ (2 ) $ 8,865 $ (87 ) $ 8,074 $ (138 ) $ 12,046 $ (496 ) Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 447 $ (3 ) $ — $ — $ 457 $ (6 ) $ 1,376 $ (55 ) Asset-backed retained notes 11 — — — 16 — 19 — Total held-to-maturity debt securities $ 458 $ (3 ) $ — $ — $ 473 $ (6 ) $ 1,395 $ (55 )

Finance Receivables and Loans,

Finance Receivables and Loans, Net	6 Months Ended
	Jun. 30, 2019
Loans and Leases Receivable, Net Amount [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure	Finance Receivables and Loans, Net The composition of finance receivables and loans reported at gross carrying value was as follows. ($ in millions) June 30, 2019 December 31, 2018 Consumer automotive (a) $ 72,898 $ 70,539 Consumer mortgage Mortgage Finance (b) 16,485 15,155 Mortgage — Legacy (c) 1,315 1,546 Total consumer mortgage 17,800 16,701 Total consumer 90,698 87,240 Commercial Commercial and industrial Automotive 29,382 33,672 Other 4,353 4,205 Commercial real estate 4,777 4,809 Total commercial 38,512 42,686 Total finance receivables and loans (d) $ 129,210 $ 129,926 (a) Certain finance receivables and loans are included in fair value hedging relationships. Refer to Note 17 for additional information. (b) Includes loans originated as interest-only mortgage loans of $12 million and $18 million at June 30, 2019 , and December 31, 2018 , respectively, 34% of which are expected to start principal amortization in 2019, and 41% in 2020 . The remainder of these loans have exited the interest-only period. (c) Includes loans originated as interest-only mortgage loans of $263 million and $341 million at June 30, 2019 , and December 31, 2018 , respectively, of which 99% have exited the interest-only period. (d) Totals include net unearned income, unamortized premiums and discounts, and deferred fees and costs of $577 million and $587 million at June 30, 2019 , and December 31, 2018 , respectively. The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans. Three months ended June 30, 2019 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2019 $ 1,070 $ 52 $ 166 $ 1,288 Charge-offs (a) (301 ) (5 ) (12 ) (318 ) Recoveries 129 7 — 136 Net charge-offs (172 ) 2 (12 ) (182 ) Provision for loan losses 180 (5 ) 2 177 Other — — (1 ) (1 ) Allowance at June 30, 2019 $ 1,078 $ 49 $ 155 $ 1,282 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. Three months ended June 30, 2018 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2018 $ 1,066 $ 74 $ 138 $ 1,278 Charge-offs (a) (296 ) (8 ) (2 ) (306 ) Recoveries 114 6 6 126 Net charge-offs (182 ) (2 ) 4 (180 ) Provision for loan losses 168 (4 ) (6 ) 158 Other 1 (2 ) 2 1 Allowance at June 30, 2018 $ 1,053 $ 66 $ 138 $ 1,257 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. Six months ended June 30, 2019 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2019 $ 1,048 $ 53 $ 141 $ 1,242 Charge-offs (a) (653 ) (8 ) (17 ) (678 ) Recoveries 247 12 — 259 Net charge-offs (406 ) 4 (17 ) (419 ) Provision for loan losses 437 (8 ) 30 459 Other (1 ) — 1 — Allowance at June 30, 2019 $ 1,078 $ 49 $ 155 $ 1,282 Allowance for loan losses at June 30, 2019 Individually evaluated for impairment $ 42 $ 20 $ 49 $ 111 Collectively evaluated for impairment 1,036 29 106 1,171 Finance receivables and loans at gross carrying value Ending balance $ 72,898 $ 17,800 $ 38,512 $ 129,210 Individually evaluated for impairment 496 220 196 912 Collectively evaluated for impairment 72,402 17,580 38,316 128,298 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. Six months ended June 30, 2018 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2018 $ 1,066 $ 79 $ 131 $ 1,276 Charge-offs (a) (661 ) (20 ) (2 ) (683 ) Recoveries 226 12 6 244 Net charge-offs (435 ) (8 ) 4 (439 ) Provision for loan losses 421 (3 ) 1 419 Other 1 (2 ) 2 1 Allowance at June 30, 2018 $ 1,053 $ 66 $ 138 $ 1,257 Allowance for loan losses at June 30, 2018 Individually evaluated for impairment $ 42 $ 24 $ 27 $ 93 Collectively evaluated for impairment 1,011 42 111 1,164 Finance receivables and loans at gross carrying value Ending balance $ 70,473 $ 15,131 $ 39,940 $ 125,544 Individually evaluated for impairment 480 228 198 906 Collectively evaluated for impairment 69,993 14,903 39,742 124,638 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. The following table presents information about significant sales of finance receivables and loans and transfers of finance receivables and loans from held-for-investment to held-for-sale based on net carrying value. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Consumer automotive $ — $ — $ 20 $ — Consumer mortgage — 4 — 5 Total sales and transfers (a) $ — $ 4 $ 20 $ 5 (a) During the six months ended June 30, 2019 , we also sold $131 million of loans held-for-sale that were initially classified as finance receivables and loans held-for-investment, and transferred $79 million of finance receivables from held-for-sale to held-for-investment, both relating to equipment finance receivables from our commercial automotive business. The following table presents information about significant purchases of finance receivables and loans based on unpaid principal balance at the time of purchase. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Consumer automotive $ 218 $ 233 $ 317 $ 401 Consumer mortgage 678 852 1,913 2,147 Commercial 3 — 3 — Total purchases of finance receivables and loans $ 899 $ 1,085 $ 2,233 $ 2,548 The following table presents an analysis of our past-due finance receivables and loans recorded at gross carrying value. ($ in millions) 30–59 days past due 60–89 days past due 90 days or more past due Total past due Current Total finance receivables and loans June 30, 2019 Consumer automotive $ 1,802 $ 444 $ 273 $ 2,519 $ 70,379 $ 72,898 Consumer mortgage Mortgage Finance 77 9 9 95 16,390 16,485 Mortgage — Legacy 32 13 30 75 1,240 1,315 Total consumer mortgage 109 22 39 170 17,630 17,800 Total consumer 1,911 466 312 2,689 88,009 90,698 Commercial Commercial and industrial Automotive 3 — 67 70 29,312 29,382 Other — — 2 2 4,351 4,353 Commercial real estate — — 4 4 4,773 4,777 Total commercial 3 — 73 76 38,436 38,512 Total consumer and commercial $ 1,914 $ 466 $ 385 $ 2,765 $ 126,445 $ 129,210 December 31, 2018 Consumer automotive $ 2,107 $ 537 $ 296 $ 2,940 $ 67,599 $ 70,539 Consumer mortgage Mortgage Finance 67 5 4 76 15,079 15,155 Mortgage — Legacy 30 10 42 82 1,464 1,546 Total consumer mortgage 97 15 46 158 16,543 16,701 Total consumer 2,204 552 342 3,098 84,142 87,240 Commercial Commercial and industrial Automotive — 1 31 32 33,640 33,672 Other — 4 16 20 4,185 4,205 Commercial real estate — — 1 1 4,808 4,809 Total commercial — 5 48 53 42,633 42,686 Total consumer and commercial $ 2,204 $ 557 $ 390 $ 3,151 $ 126,775 $ 129,926 The following table presents the gross carrying value of our finance receivables and loans on nonaccrual status. ($ in millions) June 30, 2019 December 31, 2018 Consumer automotive $ 642 $ 664 Consumer mortgage Mortgage Finance 12 9 Mortgage — Legacy 53 70 Total consumer mortgage 65 79 Total consumer 707 743 Commercial Commercial and industrial Automotive 89 203 Other 101 142 Commercial real estate 6 4 Total commercial 196 349 Total consumer and commercial finance receivables and loans $ 903 $ 1,092 Management performs a quarterly analysis of the consumer automotive, consumer mortgage, and commercial portfolios using a range of credit quality indicators to assess the adequacy of the allowance for loan losses based on historical and current trends. The following tables present the population of loans by quality indicators for our consumer automotive, consumer mortgage, and commercial portfolios. The following table presents performing and nonperforming credit quality indicators in accordance with our internal accounting policies for our consumer finance receivables and loans recorded at gross carrying value. Nonperforming loans include finance receivables and loans on nonaccrual status when the principal or interest has been delinquent for 90 days or more, or when full collection is not expected. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for additional information. June 30, 2019 December 31, 2018 ($ in millions) Performing Nonperforming Total Performing Nonperforming Total Consumer automotive $ 72,256 $ 642 $ 72,898 $ 69,875 $ 664 $ 70,539 Consumer mortgage Mortgage Finance 16,473 12 16,485 15,146 9 15,155 Mortgage — Legacy 1,262 53 1,315 1,476 70 1,546 Total consumer mortgage 17,735 65 17,800 16,622 79 16,701 Total consumer $ 89,991 $ 707 $ 90,698 $ 86,497 $ 743 $ 87,240 The following table presents pass and criticized credit quality indicators based on regulatory definitions for our commercial finance receivables and loans recorded at gross carrying value. June 30, 2019 December 31, 2018 ($ in millions) Pass Criticized (a) Total Pass Criticized (a) Total Commercial and industrial Automotive $ 26,629 $ 2,753 $ 29,382 $ 30,799 $ 2,873 $ 33,672 Other 3,580 773 4,353 3,373 832 4,205 Commercial real estate 4,517 260 4,777 4,538 271 4,809 Total commercial $ 34,726 $ 3,786 $ 38,512 $ 38,710 $ 3,976 $ 42,686 (a) Includes loans classified as special mention, substandard, or doubtful. These classifications are based on regulatory definitions and generally represent loans within our portfolio that have a higher default risk or have already defaulted. Impaired Loans and Troubled Debt Restructurings Impaired Loans Loans are considered impaired when we determine it is probable that we will be unable to collect all amounts due according to the terms of the loan agreement. For more information on our impaired finance receivables and loans, refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K. The following table presents information about our impaired finance receivables and loans. ($ in millions) Unpaid principal balance (a) Gross carrying value Impaired with no allowance Impaired with an allowance Allowance for impaired loans June 30, 2019 Consumer automotive $ 506 $ 496 $ 101 $ 395 $ 42 Consumer mortgage Mortgage Finance 14 14 6 8 — Mortgage — Legacy 211 206 65 141 20 Total consumer mortgage 225 220 71 149 20 Total consumer 731 716 172 544 62 Commercial Commercial and industrial Automotive 89 89 18 71 19 Other 122 101 55 46 30 Commercial real estate 6 6 6 — — Total commercial 217 196 79 117 49 Total consumer and commercial finance receivables and loans $ 948 $ 912 $ 251 $ 661 $ 111 December 31, 2018 Consumer automotive $ 503 $ 495 $ 105 $ 390 $ 44 Consumer mortgage Mortgage Finance 15 15 6 9 1 Mortgage — Legacy 221 216 65 151 22 Total consumer mortgage 236 231 71 160 23 Total consumer 739 726 176 550 67 Commercial Commercial and industrial Automotive 203 203 112 91 10 Other 159 142 40 102 46 Commercial real estate 4 4 4 — — Total commercial 366 349 156 193 56 Total consumer and commercial finance receivables and loans $ 1,105 $ 1,075 $ 332 $ 743 $ 123 (a) Adjusted for charge-offs. The following tables present average balance and interest income for our impaired finance receivables and loans. 2019 2018 Three months ended June 30, ($ in millions) Average balance Interest income Average balance Interest income Consumer automotive $ 498 $ 9 $ 472 $ 7 Consumer mortgage Mortgage Finance 14 — 9 — Mortgage — Legacy 209 2 219 3 Total consumer mortgage 223 2 228 3 Total consumer 721 11 700 10 Commercial Commercial and industrial Automotive 113 — 78 1 Other 108 — 82 — Commercial real estate 6 — 5 — Total commercial 227 — 165 1 Total consumer and commercial finance receivables and loans $ 948 $ 11 $ 865 $ 11 2019 2018 Six months ended June 30, ($ in millions) Average balance Interest income Average balance Interest income Consumer automotive $ 498 $ 17 $ 462 $ 14 Consumer mortgage Mortgage Finance 15 — 9 — Mortgage — Legacy 211 5 220 5 Total consumer mortgage 226 5 229 5 Total consumer 724 22 691 19 Commercial Commercial and industrial Automotive 143 1 61 2 Other 117 — 66 — Commercial real estate 6 — 4 — Total commercial 266 1 131 2 Total consumer and commercial finance receivables and loans $ 990 $ 23 $ 822 $ 21 Troubled Debt Restructurings Troubled Debt Restructurings (TDRs) are loan modifications where concessions were granted to borrowers experiencing financial difficulties. For consumer automotive loans, we may offer several types of assistance to aid our customers, including payment extensions and rewrites of the loan terms. Additionally, for mortgage loans, as part of certain programs, we offer mortgage loan modifications to qualified borrowers. These programs are in place to provide support to our mortgage customers in financial distress, including principal forgiveness, maturity extensions, delinquent interest capitalization, and changes to contractual interest rates. Total TDRs recorded at gross carrying value were $818 million and $812 million at June 30, 2019 , and December 31, 2018, respectively. Total commitments to lend additional funds to borrowers whose terms had been modified in a TDR were $15 million and $4 million at June 30, 2019 , and December 31, 2018, respectively. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for additional information. The following tables present information related to finance receivables and loans recorded at gross carrying value modified in connection with a TDR during the period. 2019 2018 Three months ended June 30, ($ in millions) Number of loans Pre-modification gross carrying value Post-modification gross carrying value Number of loans Pre-modification gross carrying value Post-modification gross carrying value Consumer automotive 5,598 $ 96 $ 85 5,898 $ 107 $ 93 Consumer mortgage Mortgage Finance 2 — — 7 2 2 Mortgage — Legacy 18 3 3 27 6 7 Total consumer mortgage 20 3 3 34 8 9 Total consumer 5,618 99 88 5,932 115 102 Commercial Commercial and industrial Automotive — — — 3 4 4 Other 1 22 6 2 55 51 Total commercial 1 22 6 5 59 55 Total consumer and commercial finance receivables and loans 5,619 $ 121 $ 94 5,937 $ 174 $ 157 2019 2018 Six months ended June 30, ($ in millions) Number of loans Pre-modification gross carrying value Post-modification gross carrying value Number of loans Pre-modification gross carrying value Post-modification gross carrying value Consumer automotive 13,025 $ 225 $ 196 12,940 $ 235 $ 203 Consumer mortgage Mortgage Finance 3 — — 8 3 3 Mortgage — Legacy 38 6 6 89 16 16 Total consumer mortgage 41 6 6 97 19 19 Total consumer 13,066 231 202 13,037 254 222 Commercial Commercial and industrial Automotive 6 41 41 3 4 4 Other 1 22 6 2 55 51 Total commercial 7 63 47 5 59 55 Total consumer and commercial finance receivables and loans 13,073 $ 294 $ 249 13,042 $ 313 $ 277 The following tables present information about finance receivables and loans recorded at gross carrying value that have redefaulted during the reporting period and were within twelve months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2019 2018 Three months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 1,752 $ 20 $ 12 2,425 $ 29 $ 17 Consumer mortgage Mortgage — Legacy — — — 1 — — Total consumer finance receivables and loans 1,752 $ 20 $ 12 2,426 $ 29 $ 17 2019 2018 Six months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 3,961 $ 46 $ 28 4,751 $ 57 $ 35 Consumer mortgage Mortgage — Legacy — — — 1 — — Total consumer finance receivables and loans 3,961 $ 46 $ 28 4,752 $ 57 $ 35

Leasing

Leasing	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leasing On January 1, 2019, we adopted the amendments to the lease accounting principles. Refer to the section titled Recently Adopted Accounting Standards in Note 1 for additional information. Ally as the Lessee We have operating leases for our corporate facilities, which have remaining lease terms of 3 months to 13 years. Most of the property leases have fixed payment terms with annual fixed-escalation clauses and include options to extend the leases for periods that range from 1 to 15 years. Some of those lease agreements also include options to terminate the leases in periods that range from 2 to 5 years after the commencement of the leases. We have not included any of these term extensions or termination provisions in our estimates of the lease term, as we do not consider it reasonably certain that the options will be exercised. Our property-lease agreements contain a lease component, which includes the right to use the real estate, and non-lease components, which include utilities and common area maintenance services. Lease components are accounted for under the ASC Topic on Leases, while non-lease components are accounted for under other GAAP Topics. We elected the practical expedient to account for the lease and non-lease components for property leases as a single lease component. Additional variable-rent payments made during the lease term are not based on a rate or index and are excluded from the calculations of ROU assets and lease liabilities and recognized as a component of variable lease expense as incurred. We also have operating leases for a fleet of vehicles that is used by our sales force for business purposes, with noncancellable lease terms of 367 days. Thereafter, the leases are month-to-month, up to a maximum of 48 months from inception. In addition to lease costs related to the vehicles, the lease contracts include non-lease components such as maintenance, fuel, and administrative services. We elected to account for the lease and non-lease components separately. As a result, the non-lease components are excluded from the calculation of the ROU asset and lease liability and are recognized as other operating expenses as incurred. The following table details our total investment in operating leases. ($ in millions) June 30, 2019 January 1, 2019 (a) Assets Operating lease right-of-use assets (b) $ 172 $ 161 Liabilities Operating lease liabilities (c) $ 200 $ 190 (a) Date of adoption. (b) Included in other assets on our Condensed Consolidated Balance Sheet . (c) Included in accrued expenses and other liabilities on our Condensed Consolidated Balance Sheet . During the three months and six months ended June 30, 2019 , we paid $13 million and $25 million , respectively, in cash for amounts included in the measurement of lease liabilities at June 30, 2019 . This amount is included in net cash provided by operating activities in the Condensed Consolidated Statement of Cash Flows . During the six months ended June 30, 2019 , we obtained $34 million of ROU assets in exchange for new operating lease liabilities. As of June 30, 2019 , the weighted-average remaining lease term of our operating lease portfolio was 7 years, and the weighted-average discount rate was 2.97% . The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2019 , and that have noncancellable lease terms expiring after June 30, 2019 . ($ in millions) 2019 $ 25 2020 48 2021 37 2022 25 2023 16 2024 and thereafter 71 Total undiscounted cash flows 222 Difference between undiscounted cash flows and discounted cash flows (22 ) Total lease liability $ 200 In addition to the above, we entered into a forward-starting lease agreement in September 2017, for a new corporate facility in Charlotte, North Carolina, where we plan to consolidate several existing facilities into that location. The lessor and their agents are currently constructing the facilities at this location, with the lease scheduled to commence in April 2021 after construction is completed. The lease agreement will have a total of $290 million in undiscounted future lease payments over the 15 year term of the lease. Future minimum rental payments required under operating leases as of December 31, 2018, prior to the date of adoption and as defined by the previous lease accounting guidance, with noncancellable lease terms expiring after December 31, 2018, were as follows. Year ended December 31, ($ in millions) 2019 $ 48 2020 47 2021 46 2022 37 2023 31 2024 and thereafter 294 Total minimum payments required $ 503 The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Operating lease expense $ 12 $ 11 $ 23 $ 21 Variable lease expense 2 1 4 3 Total lease expense, net (a) $ 14 $ 12 $ 27 $ 24 (a) Included in other operating expenses in our Condensed Consolidated Statement of Comprehensive Income Ally as the Lessor Investment in Operating Leases We purchase consumer operating lease contracts and the associated vehicles from dealerships after those contracts are executed by the dealers and the consumers. The amount we pay a dealer for an operating lease contract is based on the negotiated price for the vehicle less vehicle trade-in, down payment from the consumer, and available automotive manufacturer incentives. Under the operating lease, the consumer is obligated to make payments in amounts equal to the amount by which the negotiated purchase price of the vehicle (less any trade-in value, down payment, or available manufacturer incentives) exceeds the contract residual value (including residual support) of the vehicle at lease termination, plus operating lease rental charges. The customer can terminate the lease at any point after commencement, subject to additional charges and fees. Both the consumer and the dealership have the option to purchase the vehicle at the end of the lease term, which can range from 24 to 60 months, at the residual value of the vehicle, however it is not reasonably certain this option will be exercised and as such our consumer leases are classified as operating leases. We have made an accounting policy election to exclude the sales taxes we collect from consideration in the lease contract and from variable lease payments not included in contract consideration. In addition to the charges described above, the consumer is generally responsible for certain charges related to excess mileage or excessive wear and tear on the vehicle. These charges are deemed variable lease payments and, as these payments are not based on a rate or index, they are recognized as net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income as incurred. When we acquire a consumer operating lease, we assume ownership of the vehicle from the dealer. We require that property damage, bodily injury, collision, and comprehensive insurance be obtained by the lessee on all consumer operating leases. Neither the consumer nor the dealer is responsible for the value of the vehicle at the time of lease termination. When vehicles are not purchased by customers or the receiving dealer at scheduled lease termination, the vehicle is returned to us for remarketing. We generally bear the risk of loss to the extent the value of a leased vehicle upon remarketing is below the expected residual value. At contract inception, we determine pricing based on the projected residual value of the leased vehicle. This evaluation is primarily based on a proprietary model, which includes variables such as age, expected mileage, seasonality, segment factors, vehicle type, economic indicators, production cycle, automotive manufacturer incentives, and shifts in used-vehicle supply. This internally-generated data is compared against third-party, independent data for reasonableness. Periodically, we revise the projected value of the leased vehicle at termination based on current market conditions and adjust depreciation expense if necessary over the remaining life of the contract. At termination, our actual sales proceeds from remarketing the vehicle may be higher or lower than the estimated residual value resulting in a gain or loss on remarketing, which is included in net depreciation expense on operating lease assets in our Condensed Consolidated Statement of Comprehensive Income . Excessive mileage or excessive wear and tear on the vehicle during the lease may impact the sales proceeds received upon remarketing. As of June 30, 2019 , consumer operating leases with a carrying value, net of accumulated depreciation, of $366 million were covered by a residual value guarantee of 15% of the manufacturer’s suggested retail price. The following table details our investment in operating leases. ($ in millions) June 30, 2019 December 31, 2018 Vehicles $ 9,961 $ 9,995 Accumulated depreciation (1,554 ) (1,578 ) Investment in operating leases, net $ 8,407 $ 8,417 The following table presents future minimum rental payments we have the right to receive under operating leases with noncancellable lease terms expiring after June 30, 2019 . ($ in millions) 2019 $ 726 2020 1,062 2021 536 2022 129 2023 16 2024 and thereafter 1 Total lease payments from operating leases $ 2,470 We recognized $363 million and $724 million , and $374 million and $756 million in operating lease revenue for the three months and six months ended June 30, 2019 , and June 30, 2018 , respectively. Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Depreciation expense on operating lease assets (excluding remarketing gains) (a) $ 262 $ 281 $ 523 $ 572 Remarketing gains, net (23 ) (16 ) (38 ) (34 ) Net depreciation expense on operating lease assets $ 239 $ 265 $ 485 $ 538 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles $5 million and $9 million during the three and six months ended June 30, 2019, respectively, and $6 million and $13 million during the three and six months ended June 30, 2018. Finance Leases Our total gross investment in finance leases, which is included in finance receivables and loans, net, on our Condensed Consolidated Balance Sheet was $492 million and $439 million as of June 30, 2019 , and December 31, 2018 , respectively. This includes lease payment receivables of $478 million and $425 million at June 30, 2019 , and December 31, 2018 , respectively, and unguaranteed residual assets of $14 million at both June 30, 2019 , and December 31, 2018 . Interest income on finance lease receivables was $6 million and $12 million for the three months and six months ended June 30, 2019 , respectively, and $5 million and $11 million for the three months and six months ended June 30, 2018 , and is included in interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income . The following table presents future minimum rental payments we have the right to receive under finance leases with noncancellable lease terms expiring after June 30, 2019 . ($ in millions) 2019 $ 82 2020 157 2021 142 2022 79 2023 46 2024 and thereafter 32 Total undiscounted cash flows 538 Difference between undiscounted cash flows and discounted cash flows (60 ) Present value of lease payments recorded as lease receivable $ 478

Securitizations and Variable In

Securitizations and Variable Interest Entities	6 Months Ended
	Jun. 30, 2019
Securitizations And Variable Interest Entities [Abstract]
Variable Interest Entity Disclosure	Securitizations and Variable Interest Entities We securitize, transfer, and service consumer and commercial automotive loans, and operating leases. We often securitize these loans and notes secured by operating leases (collectively referred to as financial assets) using special purpose entities (SPEs). An SPE is a legal entity that is designed to fulfill a specified limited need of the sponsor. Our principal use of SPEs is to obtain liquidity by securitizing certain of our financial assets. SPEs are often variable interest entities (VIEs) and may or may not be included on our Condensed Consolidated Balance Sheet . VIEs are legal entities that either have an insufficient amount of equity at risk for the entity to finance its activities without additional subordinated financial support or, as a group, the holders of the equity investment at risk lack the ability to control the entity’s activities that most significantly impact economic performance through voting or similar rights, or do not have the obligation to absorb the expected losses or the right to receive expected residual returns of the entity. The VIEs included on the Condensed Consolidated Balance Sheet represent SPEs where we are deemed to be the primary beneficiary, primarily due to our servicing activities and our beneficial interests in the VIE that could be potentially significant. The nature, purpose, and activities of nonconsolidated SPEs are similar to those of our consolidated SPEs with the primary difference being the nature and extent of our continuing involvement. For nonconsolidated SPEs, the transferred financial assets are removed from our balance sheet provided the conditions for sale accounting are met. The financial assets obtained from the securitization are primarily reported as cash or retained interests (if applicable). Liabilities incurred as part of these securitizations, are recorded at fair value at the time of sale and are reported as accrued expenses and other liabilities on our Condensed Consolidated Balance Sheet . Upon the sale of the loans, we recognize a gain or loss on sale for the difference between the assets recognized, the assets derecognized, and the liabilities recognized as part of the transaction. With respect to our ongoing right to service the assets we sell, the servicing fee we receive represents adequate compensation, and consequently, we do not recognize a servicing asset or liability. There were no sales of financial assets into nonconsolidated VIEs for both the three months and six months ended June 30, 2019 , and June 30, 2018 . We provide long-term guarantee contracts to investors in certain nonconsolidated affordable housing entities and have extended a line of credit to provide liquidity. Since we do not have control over the entities or the power to make decisions, we do not consolidate the entities and our involvement is limited to the guarantee and the line of credit. We are involved with various other nonconsolidated equity investments, including affordable housing entities and venture capital funds and loan funds. We do not consolidate these entities and our involvement is limited to our outstanding investment, additional capital committed to these funds plus any previously recognized low income housing tax credits that are subject to recapture. Refer to Note 1 and Note 11 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for further description of our securitization activities and our involvement with VIEs. The following table presents our involvement in consolidated and nonconsolidated VIEs in which we hold variable interests. For additional detail related to the assets and liabilities of consolidated variable interest entities refer to the Condensed Consolidated Balance Sheet . ($ in millions) Carrying value of total assets Carrying value of total liabilities Assets sold to nonconsolidated VIEs (a) Maximum exposure to loss in nonconsolidated VIEs June 30, 2019 On-balance sheet variable interest entities Consumer automotive $ 16,123 (b) $ 6,016 (c) Commercial automotive 9,077 3,047 Off-balance sheet variable interest entities Consumer automotive 33 (d) — $ 796 $ 829 (e) Commercial other 926 (f) 329 (g) — 1,187 (h) Total $ 26,159 $ 9,392 $ 796 $ 2,016 December 31, 2018 On-balance sheet variable interest entities Consumer automotive $ 16,255 (b) $ 6,573 (c) Commercial automotive 11,089 3,946 Off-balance sheet variable interest entities Consumer automotive 45 (d) — $ 1,235 $ 1,280 (e) Commercial other 806 (f) 326 (g) — 1,054 (h) Total $ 28,195 $ 10,845 $ 1,235 $ 2,334 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $8.5 billion and $8.4 billion of assets that were not encumbered by VIE beneficial interests held by third parties at June 30, 2019 , and December 31, 2018 , respectively. Ally or consolidated affiliates hold the interests in these assets. (c) Includes $22 million and $25 million of liabilities that were not obligations to third-party beneficial interest holders at June 30, 2019 , and December 31, 2018 , respectively. (d) Represents retained notes and certificated residual interests, of which $31 million and $43 million were classified as held-to-maturity securities at June 30, 2019 , and December 31, 2018 , respectively, and $2 million was classified as other assets at both June 30, 2019 , and December 31, 2018 . These assets represent our five percent interest in the credit risk of the assets underlying asset-backed securitizations. (e) Maximum exposure to loss represents the current unpaid principal balance of outstanding loans, retained notes, certificated residual interests, as well as certain noncertificated interests retained from the sale of automotive finance receivables. This measure is based on the very unlikely event that all of our sold loans have defects that would trigger a representation and warranty provision and the underlying collateral supporting the loans becomes worthless. This required disclosure is not an indication of our expected loss. (f) Amounts are classified as other assets. (g) Amounts are classified as accrued expenses and other liabilities. (h) For certain nonconsolidated affordable housing entities, maximum exposure to loss represents the yield we guaranteed investors through long-term guarantee contracts. The amount disclosed is based on the unlikely event that the underlying properties cease generating yield to investors and the yield delivered to investors in the form of low income tax housing credits is recaptured. For nonconsolidated equity investments, maximum exposure to loss represents our outstanding investment, additional committed capital, and low income housing tax credits subject to recapture. The amount disclosed is based on the unlikely event that our committed capital is funded, our investments become worthless, and the tax credits previously delivered to us are recaptured. This required disclosure is not an indication of our expected loss. Cash Flows with Off-balance Sheet Securitization Entities The following table summarizes cash flows received and paid related to SPEs and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred consumer automotive assets (e.g., servicing) that were outstanding during the six months ended June 30, 2019 , and 2018 . Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated SPEs that existed during each period. Six months ended June 30, ($ in millions) Consumer automotive Consumer mortgage 2019 Cash flows received on retained interests in securitization entities $ 13 $ — Servicing fees 6 — Cash disbursements for repurchases during the period (1 ) — 2018 Cash flows received on retained interests in securitization entities $ 9 $ — Servicing fees 10 — Cash disbursements for repurchases during the period (2 ) — Representations and warranty recoveries — 2 Delinquencies and Net Credit Losses The following tables present quantitative information about delinquencies and net credit losses for off-balance sheet securitizations and whole-loan sales where we have continuing involvement. Total amount Amount 60 days or more past due ($ in millions) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Off-balance sheet securitization entities Consumer automotive $ 796 $ 1,235 $ 9 $ 13 Whole-loan sales (a) Consumer automotive 392 634 2 3 Total $ 1,188 $ 1,869 $ 11 $ 16 (a) Whole-loan sales are not part of a securitization transaction, but represent consumer automotive pools of loans sold to third-party investors. Net credit losses Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Off-balance sheet securitization entities Consumer automotive $ 2 $ 2 $ 4 $ 5 Whole-loan sales (a) Consumer automotive 1 — 1 1 Total $ 3 $ 2 $ 5 $ 6 (a) Whole-loan sales are not part of a securitization transaction, but represent consumer automotive pools of loans sold to third-party investors.

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2019
Other Assets [Abstract]
Other Assets Disclosure	Other Assets The components of other assets were as follows. ($ in millions) June 30, 2019 December 31, 2018 Property and equipment at cost $ 1,245 $ 1,250 Accumulated depreciation (640 ) (686 ) Net property and equipment 605 564 Nonmarketable equity investments (a) 1,303 1,410 Investment in qualified affordable housing projects (b) 724 649 Accrued interest, fees, and rent receivables 631 599 Restricted cash held for securitization trusts (c) 608 965 Other accounts receivable 396 203 Equity-method investments (d) 317 262 Goodwill (e) 240 240 Net deferred tax assets 173 317 Restricted cash and cash equivalents (f) 99 124 Fair value of derivative contracts in receivable position (g) 59 41 Cash collateral placed with counterparties 9 26 Other assets 911 753 Total other assets $ 6,075 $ 6,153 (a) Includes investments in FHLB stock of $778 million and $903 million at June 30, 2019 , and December 31, 2018 , respectively; Federal Reserve Bank (FRB) stock of $448 million at both June 30, 2019 , and December 31, 2018 ; and equity securities without a readily determinable fair value of $77 million and $59 million at June 30, 2019 , and December 31, 2018 , respectively, measured at cost with adjustments for impairment and observable changes in price. During the three months and six months ended June 30, 2019 , we recorded $7 million of upward adjustments related to equity securities without a readily determinable fair value. Through June 30, 2019 , we recorded $7 million of cumulative upward adjustments and $3 million of cumulative impairments and downward adjustments related to equity securities without a readily determinable fair value. (b) Investment in qualified affordable housing projects are accounted for using the proportional amortization method of accounting and include $322 million and $319 million of unfunded commitments to provide additional capital contributions to investees at June 30, 2019 , and December 31, 2018 , respectively. Substantially all of the unfunded commitments at June 30, 2019 , are expected to be paid out over the next five years. (c) Includes restricted cash collected from customer payments on securitized receivables, which are distributed by us to investors as payments on the related secured debt, and cash reserve deposits utilized as a form of credit enhancement for various securitization transactions. (d) Primarily relates to investments made in connection with our Community Reinvestment Act (CRA) program. (e) Includes goodwill of $27 million within our Insurance operations at both June 30, 2019 , and December 31, 2018 ; $193 million within Corporate and Other at both June 30, 2019 , and December 31, 2018 ; and $20 million within Automotive Finance operations at both June 30, 2019 , and December 31, 2018 . No changes to the carrying amount of goodwill were recorded during the six months ended June 30, 2019 . (f) Primarily represents a number of arrangements with third parties where certain restrictions are placed on balances we hold due to collateral agreements associated with operational processes with a third-party bank, or letter of credit arrangements and corresponding collateral requirements. (g) For additional information on derivative instruments and hedging activities, refer to Note 17 .

Deposit Liabilities

Deposit Liabilities	6 Months Ended
	Jun. 30, 2019
Deposits [Abstract]
Deposit Liabilities Disclosures	Deposit Liabilities Deposit liabilities consisted of the following. ($ in millions) June 30, 2019 December 31, 2018 Noninterest-bearing deposits $ 162 $ 142 Interest-bearing deposits Savings and money-market checking accounts 62,078 56,050 Certificates of deposit 54,084 49,985 Other deposits 1 1 Total deposit liabilities $ 116,325 $ 106,178 At June 30, 2019 , and December 31, 2018 , certificates of deposit included $22.8 billion and $21.0 billion , respectively, of those in denominations of $100 thousand or more. At June 30, 2019 , and December 31, 2018 , certificates of deposit included $6.9 billion and $6.1 billion , respectively, of those in denominations in excess of $250 thousand federal insurance limits.

Debt

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt Disclosure	Debt Short-term Borrowings The following table presents the composition of our short-term borrowings portfolio. June 30, 2019 December 31, 2018 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes $ 2,462 $ — $ 2,462 $ 2,477 $ — $ 2,477 Federal Home Loan Bank — 3,625 3,625 — 6,825 6,825 Securities sold under agreements to repurchase — 432 432 — 685 685 Total short-term borrowings $ 2,462 $ 4,057 $ 6,519 $ 2,477 $ 7,510 $ 9,987 (a) Refer to the section below titled Long-term Debt for further details on assets restricted as collateral for payment of the related debt. We periodically enter into term repurchase agreements — short-term borrowing agreements in which we sell securities to one or more investors while simultaneously committing to repurchase them at a specified future date, at the stated price plus accrued interest. As of June 30, 2019 , the securities sold under agreements to repurchase consisted of $169 million of U.S. Treasury securities and $263 million of agency mortgage-backed residential debt securities set to mature as follows: $169 million within 30 days, and $263 million within 31 to 60 days . Refer to Note 6 and Note 20 for further details. The primary risk associated with these repurchase agreements is that the counterparty will be unable to perform under the terms of the contract. As the borrower, we are exposed to the excess market value of the securities pledged over the amount borrowed. Daily mark-to-market collateral management is designed to limit this risk to the initial margin. However, should a counterparty declare bankruptcy or become insolvent, we may incur additional delays and costs. In some instances, we may place or receive cash collateral with counterparties under collateral arrangements associated with our repurchase agreements. At June 30, 2019 , we did not place any collateral, and we received cash collateral totaling $3 million and noncash collateral totaling $1 million . At December 31, 2018 , we did not place any collateral, and we received cash collateral totaling $8 million and noncash collateral totaling $4 million . Long-term Debt The following table presents the composition of our long-term debt portfolio. June 30, 2019 December 31, 2018 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt (a) Due within one year $ 2,613 $ 6,714 $ 9,327 $ 1,663 $ 7,313 $ 8,976 Due after one year 9,458 18,681 28,139 10,444 24,773 35,217 Total long-term debt (b) (c) $ 12,071 $ 25,395 $ 37,466 $ 12,107 $ 32,086 $ 44,193 (a) Includes basis adjustments related to the application of hedge accounting. Refer to Note 17 for additional information. (b) Includes $2.6 billion of trust preferred securities at both June 30, 2019 , and December 31, 2018 . (c) Includes advances net of hedge basis adjustment from the FHLB of Pittsburgh of $14.7 billion and $14.9 billion at June 30, 2019 , and December 31, 2018 , respectively. The following table presents the scheduled remaining maturity of long-term debt at June 30, 2019 , assuming no early redemptions will occur. The amounts below include adjustments to the carrying value resulting from the application of hedge accounting. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2019 2020 2021 2022 2023 2024 and thereafter Total Unsecured Long-term debt $ 873 $ 2,256 $ 696 $ 1,084 $ 11 $ 8,273 $ 13,193 Original issue discount (21 ) (43 ) (46 ) (51 ) (57 ) (904 ) (1,122 ) Total unsecured 852 2,213 650 1,033 (46 ) 7,369 12,071 Secured Long-term debt 2,963 6,879 9,393 5,426 557 177 25,395 Total long-term debt $ 3,815 $ 9,092 $ 10,043 $ 6,459 $ 511 $ 7,546 $ 37,466 The following summarizes assets restricted as collateral for the payment of the related debt obligation primarily arising from securitization transactions accounted for as secured borrowings and repurchase agreements. June 30, 2019 December 31, 2018 ($ in millions) Total (a) Ally Bank Total (a) Ally Bank Investment securities (b) $ 5,517 $ 5,067 $ 10,280 $ 9,564 Mortgage assets held-for-investment and lending receivables 17,589 17,589 16,498 16,498 Consumer automotive finance receivables 11,287 7,319 17,015 9,715 Commercial automotive finance receivables 13,736 13,736 15,563 15,563 Operating leases 96 — 170 — Total assets restricted as collateral (c) (d) $ 48,225 $ 43,711 $ 59,526 $ 51,340 Secured debt $ 29,452 (e) $ 25,386 $ 39,596 (e) $ 32,072 (a) Ally Bank is a component of the total column. (b) A portion of the restricted investment securities at June 30, 2019 , and December 31, 2018 , were restricted under repurchase agreements. Refer to the section above titled Short-term Borrowings for information on the repurchase agreements. (c) Ally Bank has an advance agreement with the FHLB, and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $27.4 billion and $30.8 billion at June 30, 2019 , and December 31, 2018 , respectively. These assets were composed primarily of consumer mortgage finance receivables and loans and investment securities. Ally Bank has access to the FRB Discount Window and had assets pledged and restricted as collateral to the FRB totaling $2.4 billion at both June 30, 2019 , and December 31, 2018 . These assets were composed of consumer automotive finance receivables and loans. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its subsidiaries. (d) Excludes restricted cash and cash reserves for securitization trusts recorded within other assets on the Condensed Consolidated Balance Sheet . Refer to Note 10 for additional information. (e) Includes $4.1 billion and $7.5 billion of short-term borrowings at June 30, 2019 , and December 31, 2018 , respectively. Trust Preferred Securities At both June 30, 2019 , and December 31, 2018 , we had issued and outstanding approximately $2.6 billion in aggregate liquidation preference of 8.125% Fixed Rate/Floating Rate Trust Preferred Securities, Series 2 (Series 2 TRUPS). Each Series 2 TRUPS security has a liquidation amount of $25 . Distributions are cumulative and are payable until redemption at the applicable coupon rate. Distributions are payable at an annual rate equal to three-month London interbank offered rate plus 5.785% payable quarterly in arrears. Ally has the right to defer payments of interest for a period not exceeding 20 consecutive quarters. The Series 2 TRUPS have no stated maturity date, but must be redeemed upon the redemption or maturity of the related debentures (Debentures), which mature on February 15, 2040. Ally at any time may redeem the Series 2 TRUPS at a redemption price equal to 100% of the principal amount being redeemed, plus accrued and unpaid interest through the date of redemption. The Series 2 TRUPS are generally nonvoting, other than with respect to certain limited matters. During any period in which any Series 2 TRUPS remain outstanding but in which distributions on the Series 2 TRUPS have not been fully paid, none of Ally or its subsidiaries will be permitted to (i) declare or pay dividends on, make any distributions with respect to, or redeem, purchase, acquire or otherwise make a liquidation payment with respect to, any of Ally’s capital stock or make any guarantee payment with respect thereto; or (ii) make any payments of principal, interest, or premium on, or repay, repurchase or redeem, any debt securities or guarantees that rank on a parity with or junior in interest to the Debentures with certain specified exceptions in each case. Funding Facilities We utilize both committed secured credit facilities and other collateralized funding vehicles. The debt outstanding under our various funding facilities is included on our Condensed Consolidated Balance Sheet . As of June 30, 2019 , Ally Bank had exclusive access to $250 million of funding capacity from committed secured credit facilities. Ally Bank’s credit facilities are complemented by the FRB and FHLB funding programs. The total capacity in our credit facilities is provided by banks through private transactions. The facilities can be revolving in nature, generally having an original tenor ranging from 364 days to two years, and allow for additional funding during the commitment period, or they can be amortizing and not allow for any further funding after the commitment period. At June 30, 2019 , all of our $3.3 billion of capacity was revolving and of this balance, $2.0 billion was from facilities with a remaining tenor greater than 364 days. Committed Secured Credit Facilities Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Bank funding Secured $ 250 $ 3,500 $ — $ 1,300 $ 250 $ 4,800 Parent funding Secured 1,365 3,165 1,635 635 3,000 3,800 Total committed secured credit facilities $ 1,615 $ 6,665 $ 1,635 $ 1,935 $ 3,250 $ 8,600 (a) Funding from committed secured credit facilities is available on request in the event excess collateral resides in certain facilities or the extent incremental collateral is available and contributed to the facilities.

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	6 Months Ended
	Jun. 30, 2019
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable and Accrued Liabilities Disclosure	Accrued Expenses and Other Liabilities The components of accrued expenses and other liabilities were as follows. ($ in millions) June 30, 2019 December 31, 2018 Accounts payable $ 580 $ 516 Unfunded commitments for investment in qualified affordable housing projects 322 319 Employee compensation and benefits 197 255 Reserves for insurance losses and loss adjustment expenses 153 134 Cash collateral received from counterparties 38 41 Deferred revenue 28 27 Fair value of derivative contracts in payable position (a) 4 37 Other liabilities 585 347 Total accrued expenses and other liabilities $ 1,907 $ 1,676 (a) For additional information on derivative instruments and hedging activities, refer to Note 17 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	6 Months Ended
	Jun. 30, 2019
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss) Note	Accumulated Other Comprehensive (Loss) Income The following table presents changes, net of tax, in each component of accumulated other comprehensive (loss) income. Three months ended June 30, ($ in millions) Unrealized (losses) gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive (loss) income Balance at April 1, 2018 $ (524 ) $ 19 $ 25 $ (98 ) $ (578 ) Net change (74 ) — 3 1 (70 ) Balance at June 30, 2018 $ (598 ) $ 19 $ 28 $ (97 ) $ (648 ) Balance at April 1, 2019 $ (158 ) $ 18 $ 11 $ (96 ) $ (225 ) Net change 291 1 17 — 309 Balance at June 30, 2019 $ 133 $ 19 $ 28 $ (96 ) $ 84 Six months ended June 30, ($ in millions) Unrealized (losses) gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive (loss) income Balance at December 31, 2017 $ (173 ) $ 16 $ 11 $ (89 ) $ (235 ) Cumulative effect of changes in accounting principles, net of tax Adoption of Accounting Standards Update 2016-01 27 — — — 27 Adoption of Accounting Standards Update 2018-02 (40 ) 4 — (6 ) (42 ) Balance at January 1, 2018 (186 ) 20 11 (95 ) (250 ) Net change (412 ) (1 ) 17 (2 ) (398 ) Balance at June 30, 2018 $ (598 ) $ 19 $ 28 $ (97 ) $ (648 ) Balance at December 31, 2018 $ (481 ) $ 18 $ 19 $ (95 ) $ (539 ) Cumulative effect of changes in accounting principles, net of tax (c) Adoption of Accounting Standards Update 2017-08 8 — — — 8 Balance at January 1, 2019 (473 ) 18 19 (95 ) (531 ) Net change 606 1 9 (1 ) 615 Balance at June 30, 2019 $ 133 $ 19 $ 28 $ (96 ) $ 84 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 17 . (c) Refer to the section titled Recently Adopted Accounting Standards in Note 1 for additional information. The following tables present the before- and after-tax changes in each component of accumulated other comprehensive income (loss). Three months ended June 30, 2019 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 404 $ (95 ) $ 309 Less: Net realized gains reclassified to income from continuing operations 24 (a) (6 ) (b) 18 Net change 380 (89 ) 291 Translation adjustments Net unrealized gains arising during the period 4 (1 ) 3 Net investment hedges (c) Net unrealized losses arising during the period (3 ) 1 (2 ) Cash flow hedges (c) Net unrealized gains arising during the period 26 (6 ) 20 Less: Net realized gains reclassified to income from continuing operations 4 (1 ) 3 Net change 22 (5 ) 17 Other comprehensive income $ 403 $ (94 ) $ 309 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 . Three months ended June 30, 2018 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized losses arising during the period $ (95 ) $ 22 $ (73 ) Less: Net realized gains reclassified to income from continuing operations 1 (a) — (b) 1 Net change (96 ) 22 (74 ) Translation adjustments Net unrealized losses arising during the period (3 ) 1 (2 ) Net investment hedges (c) Net unrealized gains arising during the period 3 (1 ) 2 Cash flow hedges (c) Net unrealized gains arising during the period 5 (2 ) 3 Defined benefit pension plans Net unrealized gains arising during the period 1 — 1 Other comprehensive loss $ (90 ) $ 20 $ (70 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 . Six months ended June 30, 2019 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 825 $ (194 ) $ 631 Less: Net realized gains reclassified to income from continuing operations 33 (a) (8 ) (b) 25 Net change 792 (186 ) 606 Translation adjustments Net unrealized gains arising during the period 6 (2 ) 4 Net investment hedges (c) Net unrealized losses arising during the period (5 ) 2 (3 ) Cash flow hedges (c) Net unrealized losses arising during the period 21 (5 ) 16 Less: Net realized gains reclassified to income from continuing operations 9 (2 ) 7 Net change 12 (3 ) 9 Defined benefit pension plans Net unrealized losses arising during the period (1 ) — (1 ) Other comprehensive income $ 804 $ (189 ) $ 615 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 . Six months ended June 30, 2018 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized losses arising during the period $ (531 ) $ 125 $ (406 ) Less: Net realized gains reclassified to income from continuing operations 7 (a) (1 ) (b) 6 Net change (538 ) 126 (412 ) Translation adjustments Net unrealized losses arising during the period (8 ) 2 (6 ) Net investment hedges (c) Net unrealized gains arising during the period 7 (2 ) 5 Cash flow hedges (c) Net unrealized gains arising during the period 23 (6 ) 17 Defined benefit pension plans Net unrealized losses arising during the period (2 ) — (2 ) Other comprehensive loss $ (518 ) $ 120 $ (398 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 .

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Common Share The following table presents the calculation of basic and diluted earnings per common share. Three months ended June 30, Six months ended June 30, ($ in millions, except per share data; shares in thousands) (a) 2019 2018 2019 2018 Net income from continuing operations attributable to common stockholders $ 584 $ 348 $ 959 $ 600 (Loss) income from discontinued operations, net of tax (2 ) 1 (3 ) (1 ) Net income attributable to common stockholders $ 582 $ 349 $ 956 $ 599 Basic weighted-average common shares outstanding (b) 398,100 430,628 401,098 433,405 Diluted weighted-average common shares outstanding (b) 399,916 432,554 402,921 435,727 Basic earnings per common share Net income from continuing operations $ 1.47 $ 0.81 $ 2.39 $ 1.38 Loss from discontinued operations, net of tax — — (0.01 ) — Net income $ 1.46 $ 0.81 $ 2.39 $ 1.38 Diluted earnings per common share Net income from continuing operations $ 1.46 $ 0.80 $ 2.38 $ 1.38 Loss from discontinued operations, net of tax — — (0.01 ) — Net income $ 1.46 $ 0.81 $ 2.37 $ 1.37 (a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. (b) Includes shares related to share-based compensation that vested but were not yet issued .

Regulatory Capital and Other Re

Regulatory Capital and Other Regulatory Matters	6 Months Ended
	Jun. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Capital Requirements under Banking Regulations	Regulatory Capital and Other Regulatory Matters The FRB and other U.S. banking agencies have adopted risk-based and leverage capital standards that establish minimum capital-to-asset ratios for BHCs, like Ally, and depository institutions, like Ally Bank. The risk-based capital ratios are based on a banking organization’s risk-weighted assets (RWAs), which are generally determined under the standardized approach applicable to Ally and Ally Bank by (1) assigning on-balance sheet exposures to broad risk weight categories according to the counterparty or, if relevant, the guarantor or collateral (with higher risk weights assigned to categories of exposures perceived as representing greater risk), and (2) multiplying off-balance sheet exposures by specified credit conversion factors to calculate credit equivalent amounts and assigning those credit equivalent amounts to the relevant risk weight categories. The leverage ratio, in contrast, is based on an institution’s average unweighted on-balance sheet exposures. Ally and Ally Bank are subject to capital requirements issued by U.S. banking regulators that require us to maintain risk-based and leverage capital ratios above minimum levels. As of January 1, 2015, Ally and Ally Bank became subject to the rules implementing the 2010 Basel III capital framework in the United States (U.S. Basel III), which generally reflects higher capital requirements, capital buffers, and changes to regulatory capital definitions, deductions, and adjustments, relative to the predecessor requirements implementing the Basel I capital framework in the United States. Certain aspects of U.S. Basel III, including the capital buffers, were subject to a phase-in period through December 31, 2018. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary action by regulators that, if undertaken, could have a direct material effect on the Condensed Consolidated Financial Statements or the results of operations and financial condition of Ally and Ally Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we and Ally Bank must meet specific capital guidelines that involve quantitative measures of capital, assets, and certain off-balance sheet items. These measures and related classifications, which are used in the calculation of our risk-based and leverage capital ratios and those of Ally Bank, are also subject to qualitative judgments by the regulators about the components of capital, the risk-weightings of assets and other exposures, and other factors. The FRB also uses these ratios and guidelines as part of the capital planning and stress testing processes. In addition, in order for Ally to maintain its status as an FHC, Ally and its bank subsidiary, Ally Bank, must remain well capitalized and well managed, as defined under applicable laws. The well capitalized standard for insured depository institutions, such as Ally Bank, reflects the capital requirements under U.S. Basel III. Under U.S. Basel III, Ally and Ally Bank must maintain a minimum Common Equity Tier 1 risk-based capital ratio of 4.5% , a minimum Tier 1 risk-based capital ratio of 6% , and a minimum total risk-based capital ratio of 8% . In addition to these minimum risk-based capital ratios, Ally and Ally Bank are subject to a capital conservation buffer of more than 2.5% . Failure to maintain the full amount of the buffer would result in restrictions on the ability of Ally and Ally Bank to make capital distributions, including dividend payments and stock repurchases and redemptions, and to pay discretionary bonuses to executive officers. U.S. Basel III also subjects Ally and Ally Bank to a minimum Tier 1 leverage ratio of 4% . U.S. Basel III also revised the eligibility criteria for regulatory capital instruments and provides for the phase-out of instruments that had previously been recognized as capital but that do not satisfy these criteria. For example, subject to certain exceptions (e.g., certain debt or equity issued to the U.S. government under the Emergency Economic Stabilization Act), trust preferred and other hybrid securities were excluded from a BHC’s Tier 1 capital as of January 1, 2016. Also, subject to a phase-in schedule, certain items are deducted from Common Equity Tier 1 capital under U.S. Basel III that had not previously been deducted from regulatory capital, and certain other deductions from regulatory capital have been modified. Among other things, U.S. Basel III requires significant investments in the common stock of unconsolidated financial institutions, mortgage servicing assets, and certain deferred tax assets that exceed specified individual and aggregate thresholds to be deducted from Common Equity Tier 1 capital. U.S. Basel III also revised the standardized approach for calculating RWAs by, among other things, modifying certain risk weights and the methods for calculating RWAs for certain types of assets and exposures. Ally and Ally Bank are subject to the U.S. Basel III standardized approach for counterparty credit risk, but not to the U.S. Basel III advanced approaches for credit risk or operational risk. Ally is also not subject to the U.S. market risk capital rule, which applies only to banking organizations with significant trading assets and liabilities. In December 2018, the FRB and other U.S. banking agencies approved a final rule to address the impact of CECL on regulatory capital by allowing BHCs and banks, including Ally, the option to phase in the day-one impact of CECL over a period of three years for regulatory capital purposes. In addition, the FRB announced that although BHCs subject to company-run stress tests as part of CCAR must incorporate CECL beginning in the 2020 cycle, in order to reduce uncertainty, the FRB will maintain its current modeling framework for the allowance for loan losses in supervisory stress tests through the 2021 cycle. In July 2019, the FRB and other U.S. banking agencies issued a final rule to simplify certain aspects of the capital rules for banking organizations such as Ally. The final rule simplifies the capital treatment for mortgage servicing assets, certain deferred tax assets, and investments in the capital instruments of unconsolidated financial institutions (collectively, threshold items). Under the current capital rule, a banking organization must deduct from Common Equity Tier 1 capital amounts of threshold items that individually exceed 10% of Common Equity Tier 1 capital. The aggregate amount of threshold items not deducted under the 10% threshold deduction but that nonetheless exceeds 15% of Common Equity Tier 1 capital minus certain deductions from and adjustments to Common Equity Tier 1 capital must also be deducted. Any amount of these threshold items not deducted from Common Equity Tier 1 capital are currently risk weighted at 100%. The final rule removes the individual and aggregate deduction thresholds for threshold items and adopts a single 25% Common Equity Tier 1 capital deduction threshold for each item individually, and requires that any of the threshold items not deducted be risk weighted at 250%. The final rule also simplifies the calculation methodology for minority interests. These provisions take effect on April 1, 2020, and we do not expect them to have a material impact to our capital position. In May 2018, targeted amendments to the Dodd-Frank Act and other financial-services laws were enacted through the Economic Growth, Regulatory Relief, and Consumer Protection Act (EGRRCP Act), including amendments that affect whether and, if so, how the FRB applies enhanced prudential standards to BHCs like us with $100 billion or more but less than $250 billion in total consolidated assets. During the fourth quarter of 2018, the FRB and other U.S. banking agencies issued proposals that would implement these amendments in the EGRRCP Act and establish risk-based categories for determining the prudential standards and the capital and liquidity requirements that apply to large U.S. banking organizations. Under the proposals, Ally would be treated as a Category IV firm and, as such, would be (1) made subject to the FRB’s Comprehensive Capital Analysis and Review (CCAR) on a two-year cycle rather than the current one-year cycle, (2) made subject to supervisory stress testing on a two-year cycle rather than the current one-year cycle, (3) required to continue submitting an annual capital plan to the FRB for non-objection, (4) allowed to continue excluding accumulated other comprehensive income (AOCI) from regulatory capital, (5) required to continue maintaining a buffer of unencumbered highly liquid assets to meet projected net cash outflows for 30 days, (6) required to conduct liquidity stress tests on a quarterly basis rather than the current monthly basis, (7) allowed to engage in more tailored liquidity risk management, including monthly rather than weekly calculations of collateral positions, the elimination of limits for activities that are not relevant to the firm, and fewer required elements of monitoring of intraday liquidity exposures, (8) exempted from company-run stress testing, the modified liquidity coverage ratio (LCR), and the proposed modified net stable funding ratio (NSFR), and (9) allowed to remain exempted from the supplementary leverage ratio, the countercyclical capital buffer, and single counterparty credit limits. Following the issuance of this proposed rule, during the first quarter of 2019, the FRB announced that a number of large and noncomplex BHCs with $100 billion or more but less than $250 billion in total consolidated assets, including Ally, will not be required to submit a capital plan to the FRB, participate in the supervisory stress test or CCAR, or conduct company-run stress tests during the 2019 cycle. Instead, our capital actions during this cycle will be largely based on the results from our 2018 supervisory stress test. In April 2018, the FRB issued a proposal to more closely align forward-looking stress testing results with the FRB’s non-stress regulatory capital requirements for banking organizations with $50 billion or more in total consolidated assets. The proposal would introduce a stress capital buffer based on firm-specific stress test performance, which would effectively replace the non-stress capital conservation buffer. The proposal would also make several changes to the CCAR process, such as eliminating the CCAR quantitative objection, narrowing the set of planned capital actions assumed to occur in the stress scenario, and eliminating the 30% dividend payout ratio as a criterion for heightened scrutiny of a firm’s capital plan. In December 2017, the Basel Committee approved revisions to the global Basel III capital framework (commonly known as Basel IV), many of which—if adopted in the United States—could heighten regulatory capital standards even more. At this time, how all of these proposals and revisions will be harmonized and finalized in the United States is not clear or predictable and we continue to evaluate the impacts these proposals and revisions may have on us. Compliance with capital requirements is a strategic priority for Ally. We expect to be in compliance with all applicable requirements within the established timeframes. The following table summarizes our capital ratios under the U.S. Basel III capital framework. June 30, 2019 December 31, 2018 Required minimum (a) Well-capitalized minimum ($ in millions) Amount Ratio Amount Ratio Capital ratios Common Equity Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 13,887 9.52 % $ 13,397 9.14 % 4.50 % (b) Ally Bank 16,739 12.54 16,552 12.61 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 16,319 11.19 % $ 15,831 10.80 % 6.00 % 6.00 % Ally Bank 16,739 12.54 16,552 12.61 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 18,572 12.73 % $ 18,046 12.31 % 8.00 % 10.00 % Ally Bank 17,947 13.44 17,620 13.42 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (c) Ally Financial Inc. $ 16,319 9.05 % $ 15,831 9.00 % 4.00 % (b) Ally Bank 16,739 10.26 16,552 10.69 4.00 5.00 % (a) In addition to the minimum risk-based capital requirements for the Common Equity Tier 1 capital, Tier 1 capital, and total capital ratios, Ally and Ally Bank were required to maintain a minimum capital conservation buffer of 2.5% and 1.875% at June 30, 2019 , and December 31, 2018 , respectively. (b) Currently, there is no ratio component for determining whether a BHC is “well-capitalized.” (c) Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology. At June 30, 2019 , Ally and Ally Bank were “well-capitalized” and met all applicable capital requirements to which each was subject. Capital Planning and Stress Tests Pending the adoption of proposals issued by the FRB and other U.S. banking agencies during the fourth quarter of 2018 that would implement the EGRRCP Act , Ally is required to conduct semi-annual company-run stress tests, is subject to an annual supervisory stress test conducted by the FRB, and must submit a proposed capital plan to the FRB. Ally’s proposed capital plan must include an assessment of our expected uses and sources of capital and a description of all planned capital actions over a nine-quarter planning horizon, including any issuance of a debt or equity capital instrument, any dividend or other capital distribution, and any similar action that the FRB determines could have an impact on Ally’s capital. The proposed capital plan must also include a discussion of how Ally, under expected and stressful conditions, will maintain capital commensurate with its risks and above the minimum regulatory capital ratios, and will serve as a source of strength to Ally Bank. The FRB will either object to Ally’s proposed capital plan, in whole or in part, or provide a notice of non-objection. If the FRB objects to the proposed capital plan, or if certain material events occur after approval of the plan, Ally must submit a revised capital plan within 30 days. Even if the FRB does not object to our capital plan, Ally may be precluded from or limited in paying dividends or other capital distributions without the FRB’s approval under certain circumstances—for example, when we would not meet minimum regulatory capital ratios and capital buffers after giving effect to the distributions. The following table presents information related to our common stock and distributions to our common stockholders over the last six quarters. Common stock repurchased during period (a) Number of common shares outstanding Cash dividends declared per common share (b) ($ in millions, except per share data; shares in thousands) Approximate dollar value Number of shares Beginning of period End of period 2018 First quarter $ 185 6,473 437,054 432,691 $ 0.13 Second quarter 195 7,280 432,691 425,752 0.13 Third quarter 250 9,194 425,752 416,591 0.15 Fourth quarter 309 12,121 416,591 404,900 0.15 2019 First quarter $ 211 8,113 404,900 399,761 $ 0.17 Second quarter 229 7,775 399,761 392,775 0.17 (a) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans. (b) On July 16, 2019 , the Ally Board of Directors (the Board) declared a quarterly cash dividend of $0.17 per share on all common stock, payable on August 15, 2019 . Refer to Note 24 for further information regarding this common stock dividend. Ally submitted its 2018 capital plan and company-run stress test results to the FRB on April 5, 2018. On June 21, 2018, we publicly disclosed summary results of the stress test under the severely adverse scenario in accordance with applicable regulatory requirements. On June 28, 2018, we received from the FRB a non-objection to our capital plan, which included increases in both our stock-repurchase program and our planned dividends. Consistent with the capital plan, the Board authorized increases in our stock-repurchase program, permitting us to repurchase up to $1.0 billion of our common stock from time to time from the third quarter of 2018 through the second quarter of 2019 . On October 5, 2018 , we submitted to the FRB the results of our company-run mid-cycle stress test and publicly disclosed summary results under the severely adverse scenario in accordance with applicable regulatory requirements. As described earlier in this note, our capital actions during this cycle will be largely based on the results from our 2018 supervisory stress test. On April 1, 2019, the Board authorized an increase in our stock-repurchase program, permitting us to repurchase up to $1.25 billion of our common stock from time to time from the third quarter of 2019 through the second quarter of 2020, representing a 25% increase over our previously announced program. Additionally, on July 16, 2019 , the Board declared a quarterly cash dividend of $0.17 per share of our common stock. Refer to Note 24 for further information on the most recent dividend. Our ability to make capital distributions, including our ability to pay dividends or repurchase shares of our common stock, will continue to be subject to the FRB’s review and approval by the Board. The amount and size of any future dividends and share repurchases also will be subject to various factors, including Ally’s capital and liquidity positions, regulatory considerations, any accounting standards that affect capital or liquidity (including CECL), financial and operational performance, alternative uses of capital, common-stock price, and general market conditions, and may be suspended at any time.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure	Derivative Instruments and Hedging Activities We enter into derivative instruments, which may include interest rate, foreign-currency, and equity swaps, futures, forwards, and options in connection with our risk-management activities. Our primary objective for utilizing derivative financial instruments is to manage interest rate risk associated with our fixed- and variable-rate assets and liabilities, foreign exchange risks related to our foreign-currency denominated assets and liabilities, and other market risks related to our investment portfolio. Interest Rate Risk We monitor our mix of fixed- and variable-rate assets and liabilities and may enter into interest rate swaps, forwards, futures, options, and swaptions to achieve our desired mix of fixed- and variable-rate assets and liabilities. We execute these trades to modify our exposure to interest rate risk by converting certain fixed-rate instruments to a variable-rate and certain variable-rate instruments to a fixed-rate. We use a mix of both derivatives that qualify for hedge accounting treatment and economic hedges. Derivatives qualifying for hedge accounting can include receive-fixed swaps designated as fair value hedges of specific fixed-rate unsecured debt obligations, receive-fixed swaps designated as fair value hedges of specific fixed-rate FHLB advances, pay-fixed swaps designated as fair value hedges of securities within our available-for-sale portfolio, and pay-fixed swaps designated as fair value hedges of closed portfolios of fixed-rate held-for-investment consumer automotive loan assets in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. Other derivatives qualifying for hedge accounting consist of pay-fixed swaps designated as cash flow hedges of the expected future cash flows in the form of interest payments on certain variable-rate borrowings and deposit liabilities, receive-fixed swaps designated as cash flow hedges of the expected future cash flows in the form of interest receipts on certain securities within our available-for-sale portfolio, as well as interest rate floor contracts designated as cash flow hedges of the expected future cash flows in the form of interest receipts on a portion of our dealer floorplan commercial loans. We may also execute economic hedges, which consist of interest rate swaps, interest rate caps, forwards, futures, options, and swaptions to mitigate interest rate risk. We also enter into interest rate lock commitments and forward-sale commitments that are executed as part of our mortgage business that meet the accounting definition of a derivative. Foreign Exchange Risk We enter into derivative financial instrument contracts to mitigate the risk associated with variability in cash flows related to our various foreign-currency exposures. We enter into foreign-currency forwards with external counterparties as net investment hedges of foreign exchange exposure on our investment in foreign subsidiaries. Our equity is impacted by the cumulative translation adjustments resulting from the translation of foreign subsidiary results; this impact is reflected in our accumulated other comprehensive income. We also periodically enter into foreign-currency forwards to economically hedge any foreign-denominated debt, centralized lending, and foreign-denominated third-party loans. These foreign-currency forwards that are used as economic hedges are recorded at fair value with changes recorded as income offsetting the gains and losses on the associated foreign-currency transactions. Investment Risk We enter into equity options to economically hedge our exposure to the equity markets. Counterparty Credit Risk Derivative financial instruments contain an element of credit risk if counterparties are unable to meet the terms of the agreements. Credit risk associated with derivative financial instruments is measured as the net replacement cost should the counterparties that owe us under the contract completely fail to perform under the terms of those contracts, assuming no recoveries of underlying collateral as measured by the market value of the derivative financial instrument. We manage our risk to financial counterparties through internal credit analysis, limits, and monitoring. Additionally, derivatives and repurchase agreements are entered into with approved counterparties using industry standard agreements. We execute certain over-the-counter (OTC) derivatives such as interest rate caps using bilateral agreements with financial counterparties. Bilateral agreements generally require both parties to post collateral in the event the fair values of the derivative financial instruments meet posting thresholds established under the agreements. In the event that either party defaults on the obligation, the secured party may seize the collateral. Payments related to the exchange of collateral for OTC derivatives are recognized as collateral. We also execute certain derivatives such as interest rate swaps with clearinghouses, which requires us to post and receive collateral. For these clearinghouse derivatives, these payments are recognized as settlements rather than collateral. Certain derivative instruments contain provisions that require us to either post additional collateral or immediately settle any outstanding liability balances upon the occurrence of a specified credit-risk-related event. No such specified credit-risk-related events occurred during the three months and six months ended June 30, 2019 , or 2018 . We placed cash and noncash collateral totaling $9 million and $165 million , respectively, supporting our derivative positions at June 30, 2019 , compared to $26 million and $105 million of cash and noncash collateral at December 31, 2018 , in accounts maintained by counterparties. These amounts include collateral placed at clearinghouses and exclude cash and noncash collateral pledged under repurchase agreements. Refer to Note 12 for details on the repurchase agreements. The receivables for cash collateral placed are included on our Condensed Consolidated Balance Sheet in other assets. We received cash and noncash collateral from counterparties totaling $25 million and $32 million , respectively, in accounts maintained by counterparties at June 30, 2019 , compared to $30 million and $3 million of cash and noncash collateral at December 31, 2018 . These amounts include collateral received from clearinghouses and exclude cash and noncash collateral pledged under repurchase agreements. Refer to Note 12 for details on repurchase agreements. The payables for cash collateral received are included on our Condensed Consolidated Balance Sheet in accrued expenses and other liabilities. Included in these amounts is noncash collateral where we have been granted the right to sell or pledge the underlying assets. We have not sold or pledged any of the noncash collateral received under these agreements. Balance Sheet Presentation The following table summarizes the amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet . The amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Derivative contracts in a receivable and payable position exclude open trade equity on derivatives cleared through central clearing counterparties. Any associated collateral exchanged with our central clearing counterparties are treated as settlements of the derivative exposure, rather than collateral. Such payments are recognized as settlements of the derivatives contracts in a receivable and payable position on our Condensed Consolidated Balance Sheet . Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2019 December 31, 2018 Derivative contracts in a Notional amount Derivative contracts in a Notional amount ($ in millions) receivable position payable position receivable position payable position Derivatives designated as accounting hedges Interest rate contracts Swaps $ — $ — $ 16,986 $ — $ — $ 24,203 Purchased options 54 — 4,100 — — — Foreign exchange contracts Forwards — — 137 1 — 136 Total derivatives designated as accounting hedges 54 — 21,223 1 — 24,339 Derivatives not designated as accounting hedges Interest rate contracts Futures and forwards — — 17 — — 11 Written options 2 3 1,765 — 37 6,793 Purchased options 3 — 1,658 37 — 6,742 Total interest rate risk 5 3 3,440 37 37 13,546 Foreign exchange contracts Futures and forwards — — 126 3 — 181 Total foreign exchange risk — — 126 3 — 181 Equity contracts Written options — 1 — — — — Total equity risk — 1 — — — — Total derivatives not designated as accounting hedges 5 4 3,566 40 37 13,727 Total derivatives $ 59 $ 4 $ 24,789 $ 41 $ 37 $ 38,066 The following table presents amounts recorded on our Condensed Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges. ($ in millions) Carrying amount of the hedged items Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items Total Discontinued (a) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Assets Available-for-sale securities (b) (c) $ 1,401 $ 1,485 $ 11 $ — $ 10 $ (5 ) Finance receivables and loans, net (d) 46,111 40,850 153 24 59 5 Liabilities Long-term debt $ 12,093 $ 13,001 $ 85 $ 67 $ 66 $ 67 (a) Represents the fair value hedging adjustment on qualifying hedges for which the hedging relationship was discontinued. This represents a subset of the amounts reported in the total hedging adjustment. (b) The carrying amount of hedged available-for-sale securities is presented above using amortized cost. Refer to Note 6 for a reconciliation of the amortized cost and fair value of available-for-sale securities. (c) Includes the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At December 31, 2018 , the amortized cost basis of the closed portfolios used in these hedging relationships was $47 million . There was no basis adjustment associated with the last-of-layer relationships, and the amount identified as the last of layer in these hedge relationships was $28 million at December 31, 2018 . A last-of-layer hedge strategy did not exist at June 30, 2019 . (d) The hedged item represents the carrying value of the hedged portfolio of assets. The amount identified as the last of layer in the open hedge relationship was $13.4 billion as of June 30, 2019 , and $21.4 billion as of December 31, 2018 . The basis adjustment associated with the open last-of-layer relationship was a $94 million asset as of June 30, 2019 , and a $19 million asset as of December 31, 2018 , which would be allocated across the entire remaining closed pool upon termination or maturity of the hedge relationship. The amount that is identified as the last of layer in the discontinued hedge relationship was $12.8 billion at June 30, 2019 . The basis adjustment associated with the discontinued last-of-layer relationship was a $57 million asset as of June 30, 2019 , which was allocated across the entire remaining pool upon termination of the hedge relationship. Statement of Comprehensive Income Presentation The following table summarizes the location and amounts of gains and losses on derivative instruments not designated as accounting hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Gain (loss) recognized in earnings Interest rate contracts Gain on mortgage and automotive loans, net $ — $ — $ 1 $ — Other income, net of losses (2 ) (2 ) (7 ) — Total interest rate contracts (2 ) (2 ) (6 ) — Foreign exchange contracts Other income, net of losses (2 ) 6 (3 ) 6 Total foreign exchange contracts (2 ) 6 (3 ) 6 (Loss) gain recognized in earnings $ (4 ) $ 4 $ (9 ) $ 6 The following tables summarize the location and amounts of gains and losses on derivative instruments designated as fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ (19 ) $ 8 Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — 19 (8 ) Hedged fixed-rate FHLB advances — — — — — 10 Derivatives designated as hedging instruments on fixed-rate FHLB advances — — — — — (10 ) Hedged available-for-sale securities — — 2 (2 ) — — Derivatives designated as hedging instruments on available-for-sale securities — — (2 ) 2 — — Hedged fixed-rate consumer automotive loans 98 (6 ) — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans (98 ) 6 — — — — Total gain on fair value hedging relationships — — — — — — Gain on cash flow hedging relationships Interest rate contracts Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — 4 — Total gain on cash flow hedging relationships $ — $ — $ — $ — $ 4 $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 1,860 $ 1,647 $ 244 $ 188 $ 407 $ 434 Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on deposits Interest on long-term debt Six months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 2019 2018 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ (19 ) $ 44 Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — 19 (43 ) Hedged fixed-rate FHLB advances — — — — — — — 43 Derivatives designated as hedging instruments on fixed-rate FHLB advances — — — — — — — (43 ) Hedged available-for-sale securities — — 12 (5 ) — — — — Derivatives designated as hedging instruments on available-for-sale securities — — (12 ) 5 — — — — Hedged fixed-rate consumer automotive loans 141 (51 ) — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans (141 ) 51 — — — — — — Total gain on fair value hedging relationships — — — — — — — 1 Gain on cash flow hedging relationships Interest rate contracts Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — 1 — — — Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — — — 8 — Total gain on cash flow hedging relationships $ — $ — $ — $ — $ 1 $ — $ 8 $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 3,667 $ 3,190 $ 484 $ 364 $ 1,243 $ 750 $ 826 $ 845 During the next twelve months, we estimate no amount will be reclassified into pretax earnings from derivatives designated as cash flow hedges. The following tables summarize the location and amounts of gains and losses related to interest and amortization on derivative instruments designated as fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 6 $ 14 Interest for qualifying accounting hedges of unsecured debt — — — — — 1 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (5 ) (5 ) Interest for qualifying accounting hedges of secured debt (FHLB advances) — — — — — 2 Amortization of deferred basis adjustments of available-for-sale securities — — (1 ) — — — Amortization of deferred loan basis adjustments (9 ) (4 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment 11 5 — — — — Total gain (loss) on fair value hedging relationships 2 1 (1 ) — 1 12 Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate borrowings — — — — — 2 Total gain on cash flow hedging relationships $ — $ — $ — $ — $ — $ 2 Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Six months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 12 $ 29 Interest for qualifying accounting hedges of unsecured debt — — — — — 4 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (11 ) (6 ) Interest for qualifying accounting hedges of secured debt (FHLB advances) — — — — — 4 Amortization of deferred basis adjustments of available-for-sale securities — — (1 ) — — — Interest for qualifying accounting hedges of available-for-sale securities — — — (1 ) — — Amortization of deferred loan basis adjustments (13 ) (8 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment 17 (2 ) — — — — Total gain (loss) on fair value hedging relationships 4 (10 ) (1 ) (1 ) 1 31 Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate borrowings — — — — — 3 Total gain on cash flow hedging relationships $ — $ — $ — $ — $ 1 $ 3 The following table summarizes the effect of cash flow hedges on accumulated other comprehensive income (loss). Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Interest rate contracts Gain recognized in other comprehensive income (loss) $ 22 $ 5 $ 12 $ 23 The following table summarizes the effect of net investment hedges on accumulated other comprehensive income (loss) and the Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Foreign exchange contracts (a) (b) (Loss) gain recognized in other comprehensive income (loss) $ (3 ) $ 3 $ (5 ) $ 7 (a) There were no amounts excluded from effectiveness testing for the three months and six months ended June 30, 2019 , or 2018 . (b) Gains and losses reclassified from accumulated other comprehensive income (loss) are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. There were no amounts reclassified for the three months and six months ended June 30, 2019 , or 2018 .

Income Taxes Income Taxes

Income Taxes Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Taxes We recognized income tax benefit from continuing operations of $90 million and income tax expense from continuing operations of $21 million for the three months and six months ended June 30, 2019 , respectively, compared to income tax expense of $113 million and $189 million for the same periods in 2018 . The decreases in income tax expense for the three months and six months ended June 30, 2019 , compared to the same periods in 2018 , were primarily due to a release of valuation allowance on foreign tax credit carryforwards during the second quarter of 2019. The valuation allowance release during the three months ended June 30, 2019 , was primarily driven by our current capacity to engage in certain securitization transactions and the market demand from investors related to these transactions, coupled with the anticipated timing of the forecasted expiration of certain tax credit carryforwards . This release of valuation allowance of approximately $200 million resulted in a significant variation in the customary relationship between pretax income and income tax expense. Additionally, the decrease in income tax expense for the six months ended June 30, 2019 , compared to the same period in 2018, was partially offset by the tax effects of an increase in pretax earnings. As of each reporting date, we consider existing evidence, both positive and negative, that could impact our view with regard to future realization of deferred tax assets. Following the release of the aforementioned valuation allowance, we continue to believe it is more likely than not that the benefit for certain foreign tax credit carryforwards and state net operating loss carryforwards will not be realized. In recognition of this risk, we continue to provide a partial valuation allowance on the deferred tax assets relating to these carryforwards and it is reasonably possible that the valuation allowance may change in the next twelve months.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Fair Value Measurements For purposes of this disclosure, fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (exit price) in the principal or most advantageous market in an orderly transaction between market participants at the measurement date under current market conditions. Fair value is based on the assumptions we believe market participants would use when pricing an asset or liability. Additionally, entities are required to consider all aspects of nonperformance risk, including the entity’s own credit standing, when measuring the fair value of a liability. Judgment is used in estimating inputs to our internal valuation models used to estimate our Level 3 fair value measurements. Level 3 inputs such as interest rate movements, prepayment speeds, credit losses, and discount rates are inherently difficult to estimate. Changes to these inputs can have a significant effect on fair value measurements and amounts that could be realized. GAAP specifies a three-level hierarchy that is used when measuring and disclosing fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets (i.e., observable inputs) and the lowest priority to data lacking transparency (i.e., unobservable inputs). An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. The following is a description of the three hierarchy levels. Level 1 Inputs are quoted prices in active markets for identical assets or liabilities at the measurement date. Additionally, the entity must have the ability to access the active market, and the quoted prices cannot be adjusted by the entity. Level 2 Inputs are other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management’s best assumptions of how market participants would price the assets or liabilities. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation. The following are descriptions of the valuation methodologies used to measure material assets and liabilities at fair value and details of the valuation models, key inputs to those models, and significant assumptions utilized. • Equity Securities — Includes various marketable equity securities measured at fair value with changes in fair value recognized in net income. Measurements based on observable market prices are classified as Level 1. • Available-for-sale securities — All classes of available-for-sale securities are carried at fair value based on observable market prices, when available. If observable market prices are not available, our valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate and consider recent market transactions, experience with similar securities, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we are required to utilize various significant assumptions including market observable inputs (e.g., forward interest rates) and internally developed inputs (including prepayment speeds, delinquency levels, and credit losses). • Interests retained in financial asset sales — Includes certain noncertificated interests retained from the sale of automotive finance receivables. Due to inactivity in the market, valuations are based on internally developed discounted cash flow models (an income approach) that use a market-based discount rate; therefore, we classified these assets as Level 3. The valuation considers recent market transactions, experience with similar assets, current business conditions, and analysis of the underlying collateral, as available. To estimate cash flows, we utilize various significant assumptions, including market observable inputs (e.g., forward interest rates) and internally developed inputs (e.g., prepayment speeds, delinquency levels, and credit losses). • Derivative instruments — We enter into a variety of derivative financial instruments as part of our risk-management strategies. Certain of these derivatives are exchange traded, such as Eurodollar futures, options of Eurodollar futures, and equity options. To determine the fair value of these instruments, we utilize the quoted market prices for the particular derivative contracts; therefore, we classified these contracts as Level 1. We also execute OTC and centrally-cleared derivative contracts, such as interest rate swaps, swaptions, foreign-currency denominated forward contracts, caps, floors, and agency to-be-announced securities. We utilize third-party-developed valuation models that are widely accepted in the market to value these derivative contracts. The specific terms of the contract and market observable inputs (such as interest rate forward curves, interpolated volatility assumptions, or equity pricing) are used in the model. We classified these derivative contracts as Level 2 because all significant inputs into these models were market observable. We also enter into interest rate lock commitments and forward-sale commitments that are executed as part of our mortgage business, certain of which meet the accounting definition of a derivative and therefore are recorded as derivatives on our Condensed Consolidated Balance Sheet . Because these derivatives are valued using internal pricing models with unobservable inputs, they are classified as Level 3. We are required to consider all aspects of nonperformance risk, including our own credit standing, when measuring fair value of a liability. We reduce credit risk on the majority of our derivatives by entering into legally enforceable agreements that enable the posting and receiving of collateral associated with the fair value of our derivative positions on an ongoing basis. In the event that we do not enter into legally enforceable agreements that enable the posting and receiving of collateral, we will consider our credit risk and the credit risk of our counterparties in the valuation of derivative instruments through a credit valuation adjustment (CVA), if warranted. The CVA calculation utilizes the credit default swap spreads of the counterparty. Recurring Fair Value The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk-management activities. Recurring fair value measurements June 30, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 582 $ — $ 9 $ 591 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 2,017 1 — 2,018 U.S. States and political subdivisions — 598 — 598 Foreign government 13 136 — 149 Agency mortgage-backed residential — 19,100 — 19,100 Mortgage-backed residential — 2,934 — 2,934 Agency mortgage-backed commercial — 1,351 — 1,351 Mortgage-backed commercial — 713 — 713 Asset-backed — 477 — 477 Corporate debt — 1,348 — 1,348 Total available-for-sale securities 2,030 26,658 — 28,688 Mortgage loans held-for-sale (b) — — 22 22 Interests retained in financial asset sales — — 3 3 Derivative contracts in a receivable position Interest rate — 57 2 59 Total derivative contracts in a receivable position — 57 2 59 Total assets $ 2,612 $ 26,715 $ 36 $ 29,363 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Interest rate $ — $ 3 $ — $ 3 Other 1 — — 1 Total derivative contracts in a payable position 1 3 — 4 Total liabilities $ 1 $ 3 $ — $ 4 (a) Our investment in any one industry did not exceed 14% . (b) Carried at fair value due to fair value option elections. Recurring fair value measurements December 31, 2018 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 766 $ — $ 7 $ 773 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 1,850 1 — 1,851 U.S. States and political subdivisions — 802 — 802 Foreign government 7 138 — 145 Agency mortgage-backed residential — 17,138 — 17,138 Mortgage-backed residential — 2,686 — 2,686 Agency mortgage-backed commercial — 3 — 3 Mortgage-backed commercial — 714 — 714 Asset-backed — 723 — 723 Corporate debt — 1,241 — 1,241 Total available-for-sale securities 1,857 23,446 — 25,303 Mortgage loans held-for-sale (b) — — 8 8 Interests retained in financial asset sales — — 4 4 Derivative contracts in a receivable position Interest rate — 37 — 37 Foreign currency — 4 — 4 Total derivative contracts in a receivable position — 41 — 41 Total assets $ 2,623 $ 23,487 $ 19 $ 26,129 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Interest rate $ — $ 37 $ — $ 37 Total derivative contracts in a payable position — 37 — 37 Total liabilities $ — $ 37 $ — $ 37 (a) Our investment in any one industry did not exceed 9% . (b) Carried at fair value due to fair value option elections. The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. There were no transfers into or out of Level 3 in the periods presented. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk-management activities. Level 3 recurring fair value measurements Net realized/unrealized gains Fair value at June 30, 2019 Net unrealized gains still held at June 30, 2019 ($ in millions) Fair value at April 1, 2019 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Equity securities $ 11 $ 2 (a) $ — $ — $ — $ — $ (4 ) $ 9 $ 2 $ — Mortgage loans held-for-sale (b) 15 3 (c) — 156 (152 ) — — 22 — — Other assets Interests retained in financial asset sales 4 — — — — — (1 ) 3 — — Derivative assets 2 — (c) — — — — — 2 — — Total assets $ 32 $ 5 $ — $ 156 $ (152 ) $ — $ (5 ) $ 36 $ 2 $ — (a) Reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income . (b) Carried at fair value due to fair value option elections. (c) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Level 3 recurring fair value measurements Fair value at April 1, 2018 Net realized/unrealized gains Purchases Sales Issuances Settlements Fair value at June 30, 2018 Net unrealized gains included in earnings still held at June 30, 2018 ($ in millions) included in earnings included in OCI Assets Equity securities $ 12 $ — $ — $ — $ — $ — $ — $ 12 $ — Mortgage loans held-for-sale (a) 7 1 (b) — 73 (68 ) — — 13 — Other assets Interests retained in financial asset sales 5 — — — — — (1 ) 4 — Derivative assets 1 — — — — — — 1 — Total assets $ 25 $ 1 $ — $ 73 $ (68 ) $ — $ (1 ) $ 30 $ — (a) Carried at fair value due to fair value option elections. (b) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Level 3 recurring fair value measurements Net realized/unrealized gains Fair value at June 30, 2019 Net unrealized gains still held at June 30, 2019 ($ in millions) Fair value at Jan. 1, 2019 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Equity securities $ 7 $ 6 (a) $ — $ — $ — $ — $ (4 ) $ 9 $ 6 $ — Mortgage loans held-for-sale (b) 8 4 (c) — 246 (236 ) — — 22 — — Other assets Interests retained in financial asset sales 4 — — — — — (1 ) 3 — — Derivative assets — 2 (c) — — — — — 2 2 — Total assets $ 19 $ 12 $ — $ 246 $ (236 ) $ — $ (5 ) $ 36 $ 8 $ — (a) Reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income . (b) Carried at fair value due to fair value option elections. (c) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Level 3 recurring fair value measurements Fair value at Jan. 1, 2018 Net realized/unrealized (losses) gains Purchases Sales Issuances Settlements Fair value at June 30, 2018 Net unrealized losses included in earnings still held at June 30, 2018 ($ in millions) included in earnings included in OCI Assets Equity securities $ 19 $ (4 ) (a) $ — $ — $ — $ — $ (3 ) $ 12 $ (5 ) Mortgage loans held-for-sale (b) 13 2 (c) — 132 (134 ) — — 13 — Other assets Interests retained in financial asset sales 5 — — — — — (1 ) 4 — Derivative assets 1 — — — — — — 1 — Total assets $ 38 $ (2 ) $ — $ 132 $ (134 ) $ — $ (4 ) $ 30 $ (5 ) (a) Reported as other loss on investments, net, in the Condensed Consolidated Statement of Comprehensive Income . (b) Carried at fair value due to fair value option elections. (c) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Nonrecurring Fair Value We may be required to measure certain assets and liabilities at fair value from time to time. These periodic fair value measures typically result from the application of lower-of-cost or fair value accounting or certain impairment measures. These items would constitute nonrecurring fair value measures. The following tables display assets and liabilities measured at fair value on a nonrecurring basis and still held at June 30, 2019 , and December 31, 2018 , respectively. The amounts are as of the end of each period presented, which approximate the fair value measurements that occurred during each period. Nonrecurring fair value measurements Lower-of-cost or fair value reserve, valuation reserve, or cumulative impairment Total gain (loss) included in earnings June 30, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 253 $ 253 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 54 54 (19 ) n/m (a) Other — — 17 17 (30 ) n/m (a) Total commercial finance receivables and loans, net — — 71 71 (49 ) n/m (a) Other assets Repossessed and foreclosed assets (c) — — 13 13 (1 ) n/m (a) Nonmarketable equity investments — — 9 9 (1 ) n/m (a) Equity-method investments — — 3 3 (4 ) n/m (a) Total assets $ — $ — $ 349 $ 349 $ (55 ) n/m n/m = not meaningful (a) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation allowance, loan loss allowance, or cumulative impairment. (b) Represents the portion of the portfolio specifically impaired during 2019 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring fair value measurements Lower-of-cost or fair value reserve, valuation reserve, or cumulative impairment Total gain (loss) included in earnings December 31, 2018 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net Automotive (a) $ — $ — $ 210 $ 210 $ (2 ) n/m (b) Other — — 96 96 — n/m (b) Total loans held-for-sale, net — — 306 306 (2 ) n/m (b) Commercial finance receivables and loans, net (c) Automotive — — 84 84 (10 ) n/m (b) Other — — 55 55 (46 ) n/m (b) Total commercial finance receivables and loans, net — — 139 139 (56 ) n/m (b) Other assets Nonmarketable equity investments — — 1 1 (1 ) n/m (b) Equity-method investments — — 3 3 — n/m (b) Repossessed and foreclosed assets (d) — — 13 13 (1 ) n/m (b) Total assets $ — $ — $ 462 $ 462 $ (60 ) n/m n/m = not meaningful (a) Represents loans within our commercial automotive portfolio. Of this amount, $104 million was valued based upon a sales price for a transaction that closed in January 2019, and $106 million was valued using a discounted cash flow analysis, with a spread over forward interest rates as a significant unobservable input utilizing a range of 0.08 – 1.09% and weighted average of 0.72% . (b) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation allowance, loan loss allowance, or cumulative impairment. (c) Represents the portion of the portfolio specifically impaired during 2018 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Fair Value Option for Financial Assets We elected the fair value option for an insignificant amount of conforming mortgage loans held-for-sale. We elected the fair value option to mitigate earnings volatility by better matching the accounting for the assets with the related derivatives. Our intent in electing fair value measurement was to mitigate a divergence between accounting gains or losses and economic exposure for certain assets and liabilities. Fair Value of Financial Instruments The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting current market data to develop the market assumptions and inputs necessary to estimate fair value. As such, the actual amount received to sell an asset or the amount paid to settle a liability could differ from our estimates. Fair value information presented herein was based on information available at June 30, 2019 , and December 31, 2018 . Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2019 Financial assets Held-to-maturity securities $ 2,461 $ — $ 2,499 $ — $ 2,499 Loans held-for-sale, net 253 — — 253 253 Finance receivables and loans, net 127,928 — — 131,383 131,383 FHLB/FRB stock (a) 1,226 — 1,226 — 1,226 Financial liabilities Deposit liabilities $ 56,084 $ — $ — $ 56,575 $ 56,575 Short-term borrowings 6,519 — — 6,523 6,523 Long-term debt 37,466 — 23,441 16,734 40,175 December 31, 2018 Financial assets Held-to-maturity securities $ 2,362 $ — $ 2,307 $ — $ 2,307 Loans held-for-sale, net 306 — — 306 306 Finance receivables and loans, net 128,684 — — 130,878 130,878 FHLB/FRB stock (a) 1,351 — 1,351 — 1,351 Financial liabilities Deposit liabilities $ 51,985 $ — $ — $ 51,997 $ 51,997 Short-term borrowings 9,987 — — 9,992 9,992 Long-term debt 44,193 — 23,846 21,800 45,646 (a) Included in other assets on our Condensed Consolidated Balance Sheet .

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	6 Months Ended
	Jun. 30, 2019
Offsetting [Abstract]
Offsetting Assets and Liabilities	Offsetting Assets and Liabilities Our derivative contracts and repurchase/reverse repurchase transactions are supported by qualifying master netting and master repurchase agreements. These agreements are legally enforceable bilateral agreements that (i) create a single legal obligation for all individual transactions covered by the agreement to the nondefaulting entity upon an event of default of the counterparty, including bankruptcy, insolvency, or similar proceeding, and (ii) provide the nondefaulting entity the right to accelerate, terminate, and close-out on a net basis all transactions under the agreement and to liquidate or set off collateral promptly upon an event of default of the counterparty. To further mitigate the risk of counterparty default related to derivative instruments, we maintain collateral agreements with certain counterparties. The agreements require both parties to maintain collateral in the event the fair values of the derivative financial instruments meet established thresholds. In the event that either party defaults on the obligation, the secured party may seize the collateral. Generally, our collateral arrangements are bilateral such that we and the counterparty post collateral for the obligation. Contractual terms provide for standard and customary exchange of collateral based on changes in the market value of the outstanding derivatives. A party posts additional collateral when their obligation rises or removes collateral when it falls, such that the net replacement cost of the nondefaulting party is covered in the event of counterparty default. In certain instances as it relates to our derivative instruments, we have the option to report derivative assets and liabilities as well as assets and liabilities associated with cash collateral received or delivered that is governed by a master netting agreement on a net basis as long as certain qualifying criteria are met. Similarly, for our repurchase/reverse repurchase transactions, we have the option to report recognized assets and liabilities subject to a master netting agreement on a net basis if certain qualifying criteria are met. At June 30, 2019 , these instruments are reported as gross assets and gross liabilities on the Condensed Consolidated Balance Sheet . The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet June 30, 2019 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions (d) $ 57 $ — $ 57 $ (2 ) $ (54 ) $ 1 Derivative assets with no offsetting arrangements 2 — 2 — — 2 Total assets $ 59 $ — $ 59 $ (2 ) $ (54 ) $ 3 Liabilities Derivative liabilities in net liability positions (d) $ 2 $ — $ 2 $ — $ (1 ) $ 1 Derivative liabilities in net asset positions 2 — 2 (2 ) — — Total derivative liabilities (d) 4 — 4 (2 ) (1 ) 1 Securities sold under agreements to repurchase (e) 432 — 432 — (432 ) — Total liabilities $ 436 $ — $ 436 $ (2 ) $ (433 ) $ 1 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. There was $32 million of noncash derivative collateral, and $1 million of noncash collateral associated with our repurchase agreements, pledged to us that was excluded at June 30, 2019 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $33 million at June 30, 2019 . We have not sold or pledged any of the noncash collateral received under these agreements as of June 30, 2019 . (d) For additional information on derivative instruments and hedging activities, refer to Note 17 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 12 . Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet December 31, 2018 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions $ 41 $ — $ 41 $ — $ (4 ) $ 37 Total assets (d) $ 41 $ — $ 41 $ — $ (4 ) $ 37 Liabilities Derivative liabilities in net liability positions (d) $ 37 $ — $ 37 $ — $ — $ 37 Securities sold under agreements to repurchase (e) 685 — 685 — (685 ) — Total liabilities $ 722 $ — $ 722 $ — $ (685 ) $ 37 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. There was $3 million of noncash derivative collateral, and $4 million of noncash collateral associated with our repurchase agreements, pledged to us that was excluded at December 31, 2018 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $7 million at December 31, 2018 . We have not sold or pledged any of the noncash collateral received under these agreements as of December 31, 2018 . (d) For additional information on derivative instruments and hedging activities, refer to Note 17 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 12 .

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Reporting Disclosure	Segment Information Operating segments are defined as components of an enterprise that engage in business activity from which revenues are earned and expenses incurred for which discrete financial information is available that is evaluated regularly by our chief operating decision maker in deciding how to allocate resources and in assessing performance. We report our results of operations on a business-line basis through four operating segments: Automotive Finance operations, Insurance operations, Mortgage Finance operations, and Corporate Finance operations, with the remaining activity reported in Corporate and Other. The operating segments are determined based on the products and services offered, and reflect the manner in which financial information is currently evaluated by management. The following is a description of each of our reportable operating segments. Automotive Finance operations — One of the largest full service automotive finance operations in the United States providing automotive financing services to consumers, automotive dealers, companies, and municipalities. Our automotive finance services include providing retail installment sales contracts, loans and operating leases, offering term loans to dealers, financing dealer floorplans and other lines of credit to dealers, warehouse lines to automotive retailers, fleet financing, providing financing to companies and municipalities for the purchase or lease of vehicles, and vehicle-remarketing services. Insurance operations — A complementary automotive-focused business offering both consumer finance protection and insurance products sold primarily through the automotive dealer channel, and commercial insurance products sold directly to dealers. As part of our focus on offering dealers a broad range of consumer financial and insurance products, we provide VSCs, VMCs, and GAP products. We also underwrite select commercial insurance coverages, which primarily insure dealers’ vehicle inventory. Mortgage Finance operations — Primarily consists of the management of a held-for-investment consumer mortgage finance loan portfolio, which includes bulk purchases of high-quality jumbo and low-to-moderate income (LMI) mortgage loans originated by third parties. Our direct-to-consumer mortgage offering, named Ally Home, consists of a variety of jumbo and conforming fixed- and adjustable-rate mortgage products with the assistance of a third-party fulfillment provider. Jumbo mortgage loans are generally held on our balance sheet and are accounted for as held-for-investment. Conforming mortgage loans are generally originated as held-for-sale and then sold to the fulfillment provider , and we retain no mortgage servicing rights associated with those loans that are sold. Corporate Finance operations — Primarily provides senior secured leveraged cash flow and asset-based loans to mostly U.S.-based middle-market companies. Our primary focus is on businesses owned by private equity sponsors with loans typically used for leveraged buyouts, mergers and acquisitions, debt refinancing, restructurings, and working capital. We also offer a commercial real estate product to serve companies in the healthcare industry. Corporate and Other primarily consists of centralized corporate treasury activities such as management of the cash and corporate investment securities and loan portfolios, short- and long-term debt, retail and brokered deposit liabilities, derivative instruments, original issue discount, and the residual impacts of our corporate funds-transfer pricing (FTP) and treasury asset liability management (ALM) activities. Corporate and Other also includes certain equity investments, which primarily consist of FHLB and FRB stock, the management of our legacy mortgage portfolio, which primarily consists of loans originated prior to January 1, 2009, and reclassifications and eliminations between the reportable operating segments. Additionally, financial results related to Ally Invest are currently included within Corporate and Other. We utilize an FTP methodology for the majority of our business operations. The FTP methodology assigns charge rates and credit rates to classes of assets and liabilities based on expected duration and the benchmark rate curve plus an assumed credit spread. Matching duration allocates interest income and interest expense to these reportable segments so their respective results are insulated from interest rate risk. This methodology is consistent with our ALM practices, which includes managing interest rate risk centrally at a corporate level. The net residual impact of the FTP methodology is included within the results of Corporate and Other. The information presented in our reportable operating segments is based in part on internal allocations, which involve management judgment. Financial information for our reportable operating segments is summarized as follows. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2019 Net financing revenue and other interest income $ 1,022 $ 15 $ 46 $ 61 $ 13 $ 1,157 Other revenue 61 286 4 10 34 395 Total net revenue 1,083 301 50 71 47 1,552 Provision for loan losses 180 — — 3 (6 ) 177 Total noninterest expense 444 301 36 22 78 881 Income (loss) from continuing operations before income tax expense $ 459 $ — $ 14 $ 46 $ (25 ) $ 494 Total assets $ 114,955 $ 8,241 $ 16,584 $ 4,980 $ 35,688 $ 180,448 2018 Net financing revenue and other interest income $ 925 $ 13 $ 44 $ 57 $ 55 $ 1,094 Other revenue 63 266 2 14 19 364 Total net revenue 988 279 46 71 74 1,458 Provision for loan losses 170 — — (6 ) (6 ) 158 Total noninterest expense 436 268 32 19 84 839 Income (loss) from continuing operations before income tax expense $ 382 $ 11 $ 14 $ 58 $ (4 ) $ 461 Total assets $ 114,915 $ 7,634 $ 13,385 $ 4,458 $ 30,953 $ 171,345 (a) Net financing revenue and other interest income after the provision for loan losses totaled $980 million and $936 million for the three months ended June 30, 2019 , and 2018 , respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2019 Net financing revenue and other interest income $ 2,002 $ 27 $ 96 $ 115 $ 49 $ 2,289 Other revenue 129 646 6 21 59 861 Total net revenue 2,131 673 102 136 108 3,150 Provision for loan losses 442 — 2 26 (11 ) 459 Total noninterest expense 901 528 73 51 158 1,711 Income (loss) from continuing operations before income tax expense $ 788 $ 145 $ 27 $ 59 $ (39 ) $ 980 Total assets $ 114,955 $ 8,241 $ 16,584 $ 4,980 $ 35,688 $ 180,448 2018 Net financing revenue and other interest income $ 1,834 $ 25 $ 87 $ 103 $ 94 $ 2,143 Other revenue 129 512 3 22 52 718 Total net revenue 1,963 537 90 125 146 2,861 Provision for loan losses 429 — 2 (6 ) (6 ) 419 Total noninterest expense 884 499 66 44 160 1,653 Income (loss) from continuing operations before income tax expense $ 650 $ 38 $ 22 $ 87 $ (8 ) $ 789 Total assets $ 114,915 $ 7,634 $ 13,385 $ 4,458 $ 30,953 $ 171,345 (a) Net financing revenue and other interest income after the provision for loan losses totaled $1.8 billion and $1.7 billion for the six months ended June 30, 2019 , and 2018 , respectively.

Parent and Guarantor Condensed

Parent and Guarantor Condensed Consolidating Financial Statements	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Statements	Parent and Guarantor Condensed Consolidating Financial Statements Certain of our senior notes issued by the parent are guaranteed by 100% directly owned subsidiaries of Ally (the Guarantors). As of June 30, 2019 , the Guarantors include Ally US LLC and IB Finance Holding Company, LLC (IB Finance), each of which fully and unconditionally guarantee the senior notes on a joint and several basis. The following financial statements present condensed consolidating financial data for (i) Ally Financial Inc. (on a parent company-only basis); (ii) the Guarantors; (iii) the nonguarantor subsidiaries (all other subsidiaries); and (iv) a column for adjustments to arrive at (v) the information for the parent company, the Guarantors, and nonguarantors on a consolidated basis. Investment in subsidiaries is accounted for by the parent company and the Guarantors using the equity method for this presentation. Results of operations of subsidiaries are therefore classified in the parent company’s and Guarantors’ investment in subsidiaries accounts. The elimination entries set forth in the following condensed consolidating financial statements eliminate distributed and undistributed income of subsidiaries, investment in subsidiaries, and intercompany balances and transactions between the parent, the Guarantors, and nonguarantors. Condensed Consolidating Statements of Comprehensive Income Three months ended June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (60 ) $ — $ 1,923 $ (3 ) $ 1,860 Interest and fees on finance receivables and loans — intercompany 3 — 1 (4 ) — Interest on loans held-for-sale — — 3 — 3 Interest and dividends on investment securities and other earning assets — — 244 — 244 Interest on cash and cash equivalents 4 — 17 — 21 Interest-bearing cash — intercompany 3 — 5 (8 ) — Operating leases (1 ) — 364 — 363 Total financing (loss) revenue and other interest income (51 ) — 2,557 (15 ) 2,491 Interest expense Interest on deposits — — 651 — 651 Interest on short-term borrowings 13 — 24 — 37 Interest on long-term debt 212 — 195 — 407 Interest on intercompany debt 6 — 6 (12 ) — Total interest expense 231 — 876 (12 ) 1,095 Net depreciation expense on operating lease assets 1 — 238 — 239 Net financing (loss) revenue (283 ) — 1,443 (3 ) 1,157 Cash dividends from subsidiaries Bank subsidiary 500 500 — (1,000 ) — Nonbank subsidiaries 94 — — (94 ) — Other revenue Insurance premiums and service revenue earned — — 261 — 261 (Loss) gain on mortgage and automotive loans, net (1 ) — 3 — 2 Other gain on investments, net — — 39 — 39 Other income, net of losses 91 — 145 (143 ) 93 Total other revenue 90 — 448 (143 ) 395 Total net revenue 401 500 1,891 (1,240 ) 1,552 Provision for loan losses 5 — 173 (1 ) 177 Noninterest expense Compensation and benefits expense 9 — 287 — 296 Insurance losses and loss adjustment expenses — — 127 — 127 Other operating expenses 159 — 442 (143 ) 458 Total noninterest expense 168 — 856 (143 ) 881 Income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries 228 500 862 (1,096 ) 494 Income tax (benefit) expense from continuing operations (289 ) — 199 — (90 ) Net income from continuing operations 517 500 663 (1,096 ) 584 Loss from discontinued operations, net of tax (2 ) — — — (2 ) Undistributed income (loss) of subsidiaries Bank subsidiary 110 110 — (220 ) — Nonbank subsidiaries (43 ) — — 43 — Net income 582 610 663 (1,273 ) 582 Other comprehensive income, net of tax 309 237 311 (548 ) 309 Comprehensive income $ 891 $ 847 $ 974 $ (1,821 ) $ 891 Three months ended June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (1 ) $ — $ 1,648 $ — $ 1,647 Interest and fees on finance receivables and loans — intercompany 4 — 1 (5 ) — Interest on loans held-for-sale — — 6 — 6 Interest and dividends on investment securities and other earning assets — — 188 — 188 Interest on cash and cash equivalents 2 — 14 1 17 Interest-bearing cash — intercompany 2 — 2 (4 ) — Operating leases 1 — 373 — 374 Total financing revenue and other interest income 8 — 2,232 (8 ) 2,232 Interest expense Interest on deposits — — 395 4 399 Interest on short-term borrowings 10 — 30 — 40 Interest on long-term debt 257 — 177 — 434 Interest on intercompany debt 4 — 8 (12 ) — Total interest expense 271 — 610 (8 ) 873 Net depreciation expense on operating lease assets 1 — 264 — 265 Net financing (loss) revenue (264 ) — 1,358 — 1,094 Cash dividends from subsidiaries Bank subsidiary 500 500 — (1,000 ) — Nonbank subsidiaries 132 — — (132 ) — Other revenue Insurance premiums and service revenue earned — — 239 — 239 Gain on mortgage and automotive loans, net — — 1 — 1 Other gain on investments, net — — 27 — 27 Other income, net of losses 100 — 185 (188 ) 97 Total other revenue 100 — 452 (188 ) 364 Total net revenue 468 500 1,810 (1,320 ) 1,458 Provision for loan losses 32 — 126 — 158 Noninterest expense Compensation and benefits expense 25 — 267 — 292 Insurance losses and loss adjustment expenses — — 101 — 101 Other operating expenses 173 — 461 (188 ) 446 Total noninterest expense 198 — 829 (188 ) 839 Income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries 238 500 855 (1,132 ) 461 Income tax (benefit) expense from continuing operations (66 ) — 179 — 113 Net income from continuing operations 304 500 676 (1,132 ) 348 (Loss) income from discontinued operations, net of tax (1 ) — 2 — 1 Undistributed income (loss) of subsidiaries Bank subsidiary 52 52 — (104 ) — Nonbank subsidiaries (6 ) — — 6 — Net income 349 552 678 (1,230 ) 349 Other comprehensive loss, net of tax (70 ) (56 ) (74 ) 130 (70 ) Comprehensive income $ 279 $ 496 $ 604 $ (1,100 ) $ 279 Six months ended June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (120 ) $ — $ 3,790 $ (3 ) $ 3,667 Interest and fees on finance receivables and loans — intercompany 6 — 3 (9 ) — Interest on loans held-for-sale — — 5 — 5 Interest and dividends on investment securities and other earning assets — — 484 — 484 Interest on cash and cash equivalents 6 — 38 — 44 Interest-bearing cash — intercompany 5 — 8 (13 ) — Operating leases 1 — 723 — 724 Total financing (loss) revenue and other interest income (102 ) — 5,051 (25 ) 4,924 Interest expense Interest on deposits — — 1,243 — 1,243 Interest on short-term borrowings 26 — 55 — 81 Interest on long-term debt 423 — 403 — 826 Interest on intercompany debt 11 — 11 (22 ) — Total interest expense 460 — 1,712 (22 ) 2,150 Net depreciation expense on operating lease assets 2 — 483 — 485 Net financing (loss) revenue (564 ) — 2,856 (3 ) 2,289 Cash dividends from subsidiaries Bank subsidiary 900 900 — (1,800 ) — Nonbank subsidiaries 136 — — (136 ) — Other revenue Insurance premiums and service revenue earned — — 522 — 522 Gain on mortgage and automotive loans, net 3 — 9 — 12 Other gain on investments, net — — 147 — 147 Other income, net of losses 194 — 289 (303 ) 180 Total other revenue 197 — 967 (303 ) 861 Total net revenue 669 900 3,823 (2,242 ) 3,150 Provision for loan losses 32 — 445 (18 ) 459 Noninterest expense Compensation and benefits expense 21 — 593 — 614 Insurance losses and loss adjustment expenses — — 186 — 186 Other operating expenses 314 — 900 (303 ) 911 Total noninterest expense 335 — 1,679 (303 ) 1,711 Income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries 302 900 1,699 (1,921 ) 980 Income tax (benefit) expense from continuing operations (350 ) — 371 — 21 Net income from continuing operations 652 900 1,328 (1,921 ) 959 Loss from discontinued operations, net of tax (3 ) — — — (3 ) Undistributed income of subsidiaries Bank subsidiary 167 167 — (334 ) — Nonbank subsidiaries 140 — — (140 ) — Net income 956 1,067 1,328 (2,395 ) 956 Other comprehensive income, net of tax 615 466 631 (1,097 ) 615 Comprehensive income $ 1,571 $ 1,533 $ 1,959 $ (3,492 ) $ 1,571 Six months ended June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ 10 $ — $ 3,180 $ — $ 3,190 Interest and fees on finance receivables and loans — intercompany 6 — 2 (8 ) — Interest on loans held-for-sale — — 6 — 6 Interest and dividends on investment securities and other earning assets — — 365 (1 ) 364 Interest on cash and cash equivalents 4 — 28 — 32 Interest-bearing cash — intercompany 4 — 4 (8 ) — Operating leases 3 — 753 — 756 Total financing revenue and other interest income 27 — 4,338 (17 ) 4,348 Interest expense Interest on deposits — — 750 — 750 Interest on short-term borrowings 20 — 52 — 72 Interest on long-term debt 515 — 330 — 845 Interest on intercompany debt 7 — 10 (17 ) — Total interest expense 542 — 1,142 (17 ) 1,667 Net depreciation expense on operating lease assets 5 — 533 — 538 Net financing (loss) revenue (520 ) — 2,663 — 2,143 Cash dividends from subsidiaries Bank subsidiary 1,500 1,500 — (3,000 ) — Nonbank subsidiaries 301 — — (301 ) — Other revenue Insurance premiums and service revenue earned — — 495 — 495 Gain on mortgage and automotive loans, net 28 — 2 (28 ) 2 Other gain on investments, net — — 15 — 15 Other income, net of losses 196 — 406 (396 ) 206 Total other revenue 224 — 918 (424 ) 718 Total net revenue 1,505 1,500 3,581 (3,725 ) 2,861 Provision for loan losses 113 — 334 (28 ) 419 Noninterest expense Compensation and benefits expense 48 — 550 — 598 Insurance losses and loss adjustment expenses — — 164 — 164 Other operating expenses 355 — 932 (396 ) 891 Total noninterest expense 403 — 1,646 (396 ) 1,653 Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries 989 1,500 1,601 (3,301 ) 789 Income tax (benefit) expense from continuing operations (122 ) — 311 — 189 Net income from continuing operations 1,111 1,500 1,290 (3,301 ) 600 (Loss) income from discontinued operations, net of tax (2 ) — 1 — (1 ) Undistributed (loss) income of subsidiaries Bank subsidiary (545 ) (545 ) — 1,090 — Nonbank subsidiaries 35 — — (35 ) — Net income 599 955 1,291 (2,246 ) 599 Other comprehensive loss, net of tax (398 ) (332 ) (413 ) 745 (398 ) Comprehensive income $ 201 $ 623 $ 878 $ (1,501 ) $ 201 Condensed Consolidating Balance Sheet June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 44 $ — $ 615 $ — $ 659 Interest-bearing 6 — 2,898 — 2,904 Interest-bearing — intercompany 1,242 — 745 (1,987 ) — Total cash and cash equivalents 1,292 — 4,258 (1,987 ) 3,563 Equity securities — — 591 — 591 Available-for-sale securities — — 28,688 — 28,688 Held-to-maturity securities — — 2,475 (14 ) 2,461 Loans held-for-sale, net — — 275 — 275 Finance receivables and loans, net Finance receivables and loans, net 2,292 — 126,904 14 129,210 Intercompany loans to Nonbank subsidiaries 663 — 102 (765 ) — Allowance for loan losses (34 ) — (1,248 ) — (1,282 ) Total finance receivables and loans, net 2,921 — 125,758 (751 ) 127,928 Investment in operating leases, net 2 — 8,405 — 8,407 Intercompany receivables from Bank subsidiary 105 — — (105 ) — Nonbank subsidiaries 40 — 115 (155 ) — Investment in subsidiaries Bank subsidiary 16,865 16,865 — (33,730 ) — Nonbank subsidiaries 7,096 — — (7,096 ) — Premiums receivable and other insurance assets — — 2,460 — 2,460 Other assets 2,339 — 5,475 (1,739 ) 6,075 Total assets $ 30,660 $ 16,865 $ 178,500 $ (45,577 ) $ 180,448 Liabilities and equity Deposit liabilities Noninterest-bearing $ — $ — $ 162 $ — $ 162 Interest-bearing 1 — 116,162 — 116,163 Interest-bearing — intercompany — — 1,242 (1,242 ) — Total deposit liabilities 1 — 117,566 (1,242 ) 116,325 Short-term borrowings 2,462 — 4,057 — 6,519 Long-term debt 12,447 — 25,019 — 37,466 Intercompany debt to Bank subsidiary 14 — — (14 ) — Nonbank subsidiaries 847 — 663 (1,510 ) — Intercompany payables to Bank subsidiary 51 — — (51 ) — Nonbank subsidiaries 108 — 107 (215 ) — Interest payable 150 — 594 — 744 Unearned insurance premiums and service revenue — — 3,171 — 3,171 Accrued expenses and other liabilities 264 — 3,377 (1,734 ) 1,907 Total liabilities 16,344 — 154,554 (4,766 ) 166,132 Total equity 14,316 16,865 23,946 (40,811 ) 14,316 Total liabilities and equity $ 30,660 $ 16,865 $ 178,500 $ (45,577 ) $ 180,448 December 31, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 55 $ — $ 755 $ — $ 810 Interest-bearing 5 — 3,722 — 3,727 Interest-bearing — intercompany 1,249 — 521 (1,770 ) — Total cash and cash equivalents 1,309 — 4,998 (1,770 ) 4,537 Equity securities — — 773 — 773 Available-for-sale securities — — 25,303 — 25,303 Held-to-maturity securities — — 2,382 (20 ) 2,362 Loans held-for-sale, net — — 314 — 314 Finance receivables and loans, net Finance receivables and loans, net 2,349 — 127,577 — 129,926 Intercompany loans to Nonbank subsidiaries 882 — 397 (1,279 ) — Allowance for loan losses (55 ) — (1,187 ) — (1,242 ) Total finance receivables and loans, net 3,176 — 126,787 (1,279 ) 128,684 Investment in operating leases, net 5 — 8,412 — 8,417 Intercompany receivables from Bank subsidiary 158 — — (158 ) — Nonbank subsidiaries 45 — 129 (174 ) — Investment in subsidiaries Bank subsidiary 16,213 16,213 — (32,426 ) — Nonbank subsidiaries 6,928 — — (6,928 ) — Premiums receivable and other insurance assets — — 2,326 — 2,326 Other assets 2,226 — 5,453 (1,526 ) 6,153 Total assets $ 30,060 $ 16,213 $ 176,877 $ (44,281 ) $ 178,869 Liabilities and equity Deposit liabilities Noninterest-bearing $ — $ — $ 142 $ — $ 142 Interest-bearing 1 — 106,035 — 106,036 Interest-bearing — intercompany — — 1,249 (1,249 ) — Total deposit liabilities 1 — 107,426 (1,249 ) 106,178 Short-term borrowings 2,477 — 7,510 — 9,987 Long-term debt 12,774 — 31,419 — 44,193 Intercompany debt to Bank subsidiary 20 — — (20 ) — Nonbank subsidiaries 918 — 882 (1,800 ) — Intercompany payables to Bank subsidiary 45 — — (45 ) — Nonbank subsidiaries 124 — 129 (253 ) — Interest payable 159 — 364 — 523 Unearned insurance premiums and service revenue — — 3,044 — 3,044 Accrued expenses and other liabilities 274 — 2,962 (1,560 ) 1,676 Total liabilities 16,792 — 153,736 (4,927 ) 165,601 Total equity 13,268 16,213 23,141 (39,354 ) 13,268 Total liabilities and equity $ 30,060 $ 16,213 $ 176,877 $ (44,281 ) $ 178,869 Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash provided by operating activities $ 693 $ 900 $ 2,189 $ (1,938 ) $ 1,844 Investing activities Purchases of equity securities — — (210 ) — (210 ) Proceeds from sales of equity securities — — 511 — 511 Purchases of available-for-sale securities — — (7,018 ) — (7,018 ) Proceeds from sales of available-for-sale securities — — 2,568 — 2,568 Proceeds from repayments of available-for-sale securities — — 1,805 — 1,805 Purchases of held-to-maturity securities — — (268 ) — (268 ) Proceeds from repayments of held-to-maturity securities — — 107 — 107 Net change in investment securities — intercompany — — 6 (6 ) — Purchases of finance receivables and loans held-for-investment — — (2,850 ) 464 (2,386 ) Proceeds from sales of finance receivables and loans initially held-for-investment 476 — 147 (464 ) 159 Originations and repayments of finance receivables and loans held-for-investment and other, net (407 ) — 3,173 3 2,769 Net change in loans — intercompany 216 — 291 (507 ) — Purchases of operating lease assets — — (1,769 ) — (1,769 ) Disposals of operating lease assets 2 — 1,319 — 1,321 Capital contributions to subsidiaries (1 ) — — 1 — Returns of contributed capital 26 — — (26 ) — Net change in nonmarketable equity investments (11 ) — 124 — 113 Other, net — — (208 ) (1 ) (209 ) Net cash provided by (used in) investing activities 301 — (2,272 ) (536 ) (2,507 ) Financing activities Net change in short-term borrowings — third party (15 ) — (3,453 ) — (3,468 ) Net increase in deposits — — 10,126 7 10,133 Proceeds from issuance of long-term debt — third party 756 — 3,834 — 4,590 Repayments of long-term debt — third party (1,116 ) — (10,256 ) — (11,372 ) Net change in debt — intercompany (74 ) — (216 ) 290 — Repurchase of common stock (440 ) — — — (440 ) Dividends paid — third party (139 ) — — — (139 ) Dividends paid and returns of contributed capital — intercompany — (900 ) (1,061 ) 1,961 — Capital contributions from parent — — 1 (1 ) — Net cash used in financing activities (1,028 ) (900 ) (1,025 ) 2,257 (696 ) Effect of exchange-rate changes on cash and cash equivalents and restricted cash — — 3 — 3 Net decrease in cash and cash equivalents and restricted cash (34 ) — (1,105 ) (217 ) (1,356 ) Cash and cash equivalents and restricted cash at beginning of year 1,398 — 5,998 (1,770 ) 5,626 Cash and cash equivalents and restricted cash at June 30, $ 1,364 $ — $ 4,893 $ (1,987 ) $ 4,270 The following table provides a reconciliation of cash and cash equivalents and restricted cash from the Condensed Consolidated Balance Sheet to the Condensed Consolidated Statement of Cash Flows. June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Cash and cash equivalents on the Condensed Consolidated Balance Sheet $ 1,292 $ — $ 4,258 $ (1,987 ) $ 3,563 Restricted cash included in other assets on the Condensed Consolidated Balance Sheet (a) 72 — 635 — 707 Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows $ 1,364 $ — $ 4,893 $ (1,987 ) $ 4,270 (a) Restricted cash balances relate primarily to Ally securitization arrangements. Refer to Note 10 for additional details describing the nature of restricted cash balances. Six months ended June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash provided by operating activities $ 958 $ 1,500 $ 2,853 $ (3,302 ) $ 2,009 Investing activities Purchases of equity securities — — (500 ) — (500 ) Proceeds from sales of equity securities — — 535 — 535 Purchases of available-for-sale securities — — (4,094 ) — (4,094 ) Proceeds from sales of available-for-sale securities — — 390 — 390 Proceeds from repayments of available-for-sale securities — — 1,621 — 1,621 Purchases of held-to-maturity securities — — (316 ) — (316 ) Proceeds from repayments of held-to-maturity securities — — 72 — 72 Net change in investment securities — intercompany — — 17 (17 ) — Purchases of finance receivables and loans held-for-investment — — (3,431 ) 820 (2,611 ) Proceeds from sales of finance receivables and loans initially held-for-investment 820 — — (820 ) — Originations and repayments of finance receivables and loans held-for-investment and other, net 1,331 — (1,969 ) — (638 ) Net change in loans — intercompany 83 — (5 ) (78 ) — Purchases of operating lease assets — — (2,107 ) — (2,107 ) Disposals of operating lease assets 6 — 1,757 — 1,763 Capital contributions to subsidiaries (57 ) (6 ) — 63 — Returns of contributed capital 194 — — (194 ) — Net change in nonmarketable equity investments — — (46 ) — (46 ) Other, net (3 ) — (183 ) — (186 ) Net cash provided by (used in) investing activities 2,374 (6 ) (8,259 ) (226 ) (6,117 ) Financing activities Net change in short-term borrowings — third party (505 ) — (3,800 ) — (4,305 ) Net (decrease) increase in deposits (6 ) — 5,324 123 5,441 Proceeds from issuance of long-term debt — third party 32 — 12,908 — 12,940 Repayments of long-term debt — third party (2,412 ) — (7,388 ) — (9,800 ) Net change in debt — intercompany (138 ) — (83 ) 221 — Repurchase of common stock (380 ) — — — (380 ) Dividends paid — third party (115 ) — — — (115 ) Dividends paid and returns of contributed capital — intercompany — (1,500 ) (1,995 ) 3,495 — Capital contributions from parent — 6 57 (63 ) — Net cash (used in) provided by financing activities (3,524 ) (1,494 ) 5,023 3,776 3,781 Effect of exchange-rate changes on cash and cash equivalents and restricted cash — — (3 ) — (3 ) Net decrease in cash and cash equivalents and restricted cash (192 ) — (386 ) 248 (330 ) Cash and cash equivalents and restricted cash at beginning of year 1,395 — 5,707 (1,833 ) 5,269 Cash and cash equivalents and restricted cash at June 30, $ 1,203 $ — $ 5,321 $ (1,585 ) $ 4,939 The following table provides a reconciliation of cash and cash equivalents and restricted cash from the Condensed Consolidated Balance Sheet to the Condensed Consolidated Statement of Cash Flows. June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Cash and cash equivalents on the Condensed Consolidated Balance Sheet $ 1,071 $ — $ 4,438 $ (1,585 ) $ 3,924 Restricted cash included in other assets on the Condensed Consolidated Balance Sheet (a) 132 — 883 — 1,015 Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows $ 1,203 $ — $ 5,321 $ (1,585 ) $ 4,939 (a) Restricted cash balances relate primarily to Ally securitization arrangements. Refer to Note 10 for additional details describing the nature of restricted cash balances.

Contingencies and Other Risks

Contingencies and Other Risks	6 Months Ended
	Jun. 30, 2019
Loss Contingency [Abstract]
Contingencies Disclosure	Contingencies and Other Risks Ally and its subsidiaries, including Ally Bank, are or may be subject to potential liability in connection with pending or threatened legal proceedings and other matters. These legal matters may be formal or informal and include litigation and arbitration with one or more identified claimants, certified or purported class actions with yet-to-be-identified claimants, and regulatory or other governmental information-gathering requests, examinations, investigations, and enforcement proceedings. Our legal matters exist in varying stages of adjudication, arbitration, negotiation, or investigation and span our business lines and operations. Claims may be based in law or equity—such as those arising under contracts or in tort and those involving banking, consumer-protection, securities, tax, employment, and other laws—and some can present novel legal theories and allege substantial or indeterminate damages. Ally and its subsidiaries, including Ally Bank, also are or may be subject to potential liability under other contingent exposures, including indemnification, tax, self-insurance, and other miscellaneous contingencies. We accrue for a legal matter or other contingent exposure when a loss becomes probable and the amount of loss can be reasonably estimated. Accruals are evaluated each quarter and may be adjusted, upward or downward, based on our best judgment after consultation with counsel. No assurance exists that our accruals will not need to be adjusted in the future. When a probable or reasonably possible loss on a legal matter or other contingent exposure could be material to our consolidated financial condition, results of operations, or cash flows, we provide disclosure in this note as prescribed by ASC 450, Contingencies . Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for additional information related to our policy for establishing accruals. The course and outcome of legal matters are inherently unpredictable. This is especially so when a matter is still in its early stages, the damages sought are indeterminate or unsupported, significant facts are unclear or disputed, novel questions of law or other meaningful legal uncertainties exist, a request to certify a proceeding as a class action is outstanding or granted, multiple parties are named, or regulatory or other governmental entities are involved. Other contingent exposures and their ultimate resolution are similarly unpredictable for reasons that can vary based on the circumstances. As a result, we often are unable to determine how or when threatened or pending legal matters and other contingent exposures will be resolved and what losses may be incrementally and ultimately incurred. Actual losses may be higher or lower than any amounts accrued or estimated for those matters and other exposures, possibly to a significant degree. Subject to the foregoing, based on our current knowledge and after consultation with counsel, we do not believe that the ultimate outcomes of currently threatened or pending legal matters and other contingent exposures are likely to be material to our consolidated financial condition after taking into account existing accruals. In light of the uncertainties inherent in these matters and other exposures, however, one or more of them could be material to our results of operations or cash flows during a particular reporting period, depending on factors such as the amount of the loss or liability and the level of our income for that period.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Declaration of Quarterly Dividend On July 16, 2019 , the Board declared a quarterly cash dividend of $0.17 per share on all common stock. The dividend is payable on August 15, 2019 , to stockholders of record at the close of business on August 1, 2019 . Health Credit Services Acquisition On July 16, 2019, we signed an agreement to acquire Health Credit Services, a digital point-of-sale payment provider that offers financing to consumers, for approximately $190 million . The transaction is currently expected to close in the fourth quarter of 2019. The transaction is subject to the satisfaction of regulatory and other customary closing conditions.

Description of Business, Basi_2

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy	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 and disclosure of contingent assets and liabilities at the date of the financial statements and that affect income and expenses during the reporting period and related disclosures. In developing the estimates and assumptions, management uses all available evidence; however, actual results could differ because of uncertainties associated with estimating the amounts, timing, and likelihood of possible outcomes. Our most significant estimates pertain to the allowance for loan losses, valuations of automotive lease assets and residuals, fair value of financial instruments, and the determination of the provision for income taxes.
Lessee, Leases, Policy	At contract inception, we determine whether the contract is or contains a lease based on the terms and conditions of the contract. Lease contracts are recognized on our Condensed Consolidated Balance Sheet as right-of-use (ROU) assets and lease liabilities; however, we have elected not to recognize ROU assets and lease liabilities on real estate leases with terms of one year or less. Lease liabilities and their corresponding ROU assets are recorded based on the present value of the future lease payments over the expected lease term. As the interest rate implicit in the lease contract is typically not readily determinable, we utilize our incremental borrowing rate, which is the rate we would incur to borrow on a collateralized basis over a similar term on an amount equal to the lease payments in a similar economic environment. The ROU asset also includes initial direct costs paid less lease incentives received from the lessor. Our lease contracts are generally classified as operating and, as a result, we recognize a single lease cost within other operating expenses on the income statement on a straight-line basis over the lease term. This update to our accounting policy resulted from our adoption of Accounting Standards Update (ASU) 2016-02 on January 1, 2019, as further described within the section below titled Recently Adopted Accounting Standards .
Investment, Policy	Premiums on debt securities that have noncontingent call features that are callable at fixed prices on preset dates are amortized to the earliest call date as an adjustment to investment yield. All other premiums and discounts on debt securities are amortized over the stated maturity of the security as an adjustment to investment yield. This method of amortization differs from that described in Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K , which describes our full accounting policy for Investments. This update to our amortization methodology resulted from the adoption of ASU 2017-08 on January 1, 2019, as further described within the section below titled Recently Adopted Accounting Standards .
Income Tax, Policy	In calculating the provision for interim income taxes, in accordance with Accounting Standards Codification (ASC) 740, Income Taxes , we apply an estimated annual effective tax rate to year-to-date ordinary income. At the end of each interim period, we estimate the effective tax rate expected to be applicable for the full fiscal year. This method differs from that described in Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology.
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements, Policy	In February 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02. The amendments in this update primarily replaced the existing accounting requirements for operating leases for lessees. Lessee accounting requirements for finance leases (previously referred to as capital leases) and lessor accounting requirements for operating leases and sales type and direct financing leases were largely unchanged. The amendments require the lessee of an operating lease to record a balance sheet gross-up upon lease commencement by recognizing a ROU asset and lease liability equal to the present value of the lease payments. The ROU asset and lease liability should be derecognized in a manner that effectively yields a straight line lease expense over the lease term. In addition to the changes to the lessee operating lease accounting requirements, the amendments also changed the types of costs that can be capitalized related to a lease agreement for both lessees and lessors. The amendments also require additional disclosures for all lease types for both lessees and lessors. The FASB issued additional ASUs to clarify the guidance and provide certain practical expedients and an additional transition option. We adopted ASU 2016-02 and the subsequent ASUs that modified ASU 2016-02 (collectively, the amendments) on January 1, 2019. This includes the early adoption of ASU 2019-01, which was issued in March 2019 to amend certain provisions included in ASU 2016-02. We adopted this guidance using the modified retrospective approach on January 1, 2019, and have not adjusted prior period comparative information and will continue to disclose prior period financial information in accordance with the previous lease accounting guidance. We have elected certain practical expedients permitted within the amendments that allowed us to not reassess (i) current lease classifications, (ii) whether existing contracts meet the definition of a lease under the amendments to the lease guidance, and (iii) whether current initial direct costs meet the new criteria for capitalization, for all existing leases as of the adoption date. We made an accounting policy election to calculate the impact of adoption using the remaining minimum lease payments and remaining lease term for each contract that was identified as a lease, discounted at our incremental borrowing rate as of the adoption date. The adoption of the amendments resulted in a ROU asset of approximately $161 million from operating leases for our various corporate facilities, a $29 million reduction to accrued expenses and other liabilities for accrued rent and unamortized tenant improvement allowances, and a lease liability of approximately $190 million . The adoption did not change our previously reported Condensed Consolidated Statements of Comprehensive Income and did not result in a cumulative catch-up adjustment to opening retained earnings.
Accounting Standards Update 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements, Policy	In March 2017, the FASB issued ASU 2017-08. The amendments in this update require premiums on purchased callable debt securities to be amortized to the security’s earliest call date. Prior to this ASU, premiums and discounts on purchased callable debt securities were generally required to be amortized to the security’s maturity date. The amendments do not require an accounting change for securities held at a discount. We adopted the amendments on January 1, 2019, on a modified retrospective basis, which resulted in an increase to our accumulated deficit of $10 million , net of income taxes, partially offset by an $8 million decrease to accumulated other comprehensive loss, net of income taxes.
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements, Policy	In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (CECL). The amendments in this update introduce a new accounting model to measure credit losses for financial assets measured at amortized cost. The FASB has also issued additional ASUs to clarify the scope and provide additional guidance for ASU 2016-13. Credit losses for financial assets measured at amortized cost should be determined based on the total current expected credit losses over the life of the financial asset or group of financial assets. In effect, the financial asset or group of financial assets should be presented at the net amount expected to be collected. Credit losses will no longer be recorded under the current incurred loss model for financial assets measured at amortized cost. The amendments also modify the accounting for available-for-sale debt securities whereby credit losses will be recorded through an allowance for credit losses rather than a write-down to the security’s cost basis, which allows for reversals of credit losses when estimated credit losses decline. Credit losses for available-for-sale debt securities should be measured in a manner similar to current GAAP. The amendments are effective on January 1, 2020, and must be applied using a modified retrospective approach with a cumulative-effect adjustment through retained earnings as of the beginning of the fiscal year upon adoption as required. The new accounting model for credit losses represents a significant departure from existing GAAP, and will materially increase the allowance for credit losses on our finance receivables and loans, with a resulting negative adjustment to retained earnings. We expect that our consumer automotive loan portfolio will generate the majority of this increase. The amount of the change in the allowance for credit losses will also be impacted by the composition of our portfolio at the adoption date, as well as economic conditions and forecasts at that time. While the standard modifies the measurement of the allowance for credit losses, it does not alter the credit risk of our loan portfolios. Additionally, we currently expect to phase in the day-one impact of CECL into regulatory capital over a period of three years, as further described in Note 16 . Management created a cross-functional working group to govern the implementation of these amendments, including consideration of model development, data integrity, technology, reporting and disclosure requirements, key accounting interpretations, control environment, and corporate governance. We are in the process of validating and testing the models and procedures that will be used to calculate the credit loss reserves in accordance with these amendments. We performed limited parallel runs during the first two quarters of 2019, and will continue to refine and enhance our estimation process with additional parallel testing throughout 2019. Additionally, we do not expect a material allowance for credit losses on our debt securities as a result of the standard based upon the current composition of our portfolio.

Fair Value Fair Value (Policies

Fair Value Fair Value (Policies)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement, Policy	GAAP specifies a three-level hierarchy that is used when measuring and disclosing fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets (i.e., observable inputs) and the lowest priority to data lacking transparency (i.e., unobservable inputs). An instrument’s categorization within the fair value hierarchy is based on the lowest level of significant input to its valuation. The following is a description of the three hierarchy levels. Level 1 Inputs are quoted prices in active markets for identical assets or liabilities at the measurement date. Additionally, the entity must have the ability to access the active market, and the quoted prices cannot be adjusted by the entity. Level 2 Inputs are other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs that are observable or can be corroborated by observable market data by correlation or other means for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management’s best assumptions of how market participants would price the assets or liabilities. Generally, Level 3 assets and liabilities are valued using pricing models, discounted cash flow methodologies, or similar techniques that require significant judgment or estimation.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present a disaggregated view of our revenue from contracts with customers included in other revenue that falls within the scope of the revenue recognition principles of ASC 606, Revenue from Contracts with Customers . For further information regarding our revenue recognition policies and details about the nature of our respective revenue streams, refer to Note 1 and Note 3 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K . Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2019 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 134 $ — $ — $ — $ 134 Remarketing fee income 19 — — — — 19 Brokerage commissions and other revenue — — — — 17 17 Deposit account and other banking fees — — — — 4 4 Brokered/agent commissions — 4 — — — 4 Other 5 — — — — 5 Total revenue from contracts with customers 24 138 — — 21 183 All other revenue 37 148 4 10 13 212 Total other revenue (d) $ 61 $ 286 $ 4 $ 10 $ 34 $ 395 2018 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 125 $ — $ — $ — $ 125 Remarketing fee income 21 — — — — 21 Brokerage commissions and other revenue — — — — 15 15 Brokered/agent commissions — 4 — — — 4 Deposit account and other banking fees — — — — 3 3 Other 4 — — — — 4 Total revenue from contracts with customers 25 129 — — 18 172 All other revenue 38 137 2 14 1 192 Total other revenue (d) $ 63 $ 266 $ 2 $ 14 $ 19 $ 364 (a) We had opening balances of $2.7 billion and $2.5 billion in unearned revenue associated with outstanding contracts at April 1, 2019, and April 1, 2018, respectively, and $202 million and $195 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the three months ended June 30, 2019 , and June 30, 2018 , respectively. (b) At June 30, 2019 , we had unearned revenue of $2.8 billion associated with outstanding contracts, and with respect to this balance we expect to recognize revenue of $380 million during the remainder of 2019 , $705 million in 2020 , $605 million in 2021 , $473 million in 2022 , and $595 million thereafter. At June 30, 2018 , we had unearned revenue of $2.6 billion associated with outstanding contracts. (c) We had deferred insurance assets of $1.6 billion at both April 1, 2019, and June 30, 2019 , and recognized $114 million of expense during the three months ended June 30, 2019 . We had deferred insurance assets of $1.4 billion and $1.5 billion at April 1, 2018, and June 30, 2018 , respectively, and recognized $106 million of expense during the three months ended June 30, 2018 . (d) Represents a component of total net revenue. Refer to Note 21 for further information on our reportable operating segments. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2019 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 265 $ — $ — $ — $ 265 Remarketing fee income 37 — — — — 37 Brokerage commissions and other revenue — — — — 34 34 Deposit account and other banking fees — — — — 9 9 Brokered/agent commissions — 7 — — — 7 Other 10 — — — — 10 Total revenue from contracts with customers 47 272 — — 43 362 All other revenue 82 374 6 21 16 499 Total other revenue (c) $ 129 $ 646 $ 6 $ 21 $ 59 $ 861 2018 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 248 $ — $ — $ — $ 248 Remarketing fee income 44 — — — — 44 Brokerage commissions and other revenue — — — — 31 31 Brokered/agent commissions — 8 — — — 8 Deposit account and other banking fees — — — — 6 6 Other 6 1 — — — 7 Total revenue from contracts with customers 50 257 — — 37 344 All other revenue 79 255 3 22 15 374 Total other revenue (c) $ 129 $ 512 $ 3 $ 22 $ 52 $ 718 (a) We had opening balances of $2.6 billion and $2.5 billion in unearned revenue associated with outstanding contracts at January 1, 2019, and January 1, 2018, respectively, and $401 million and $389 million of these balances were recognized as insurance premiums and service revenue earned in our Condensed Consolidated Statement of Comprehensive Income during the six months ended June 30, 2019 , and June 30, 2018 , respectively. (b) We had deferred insurance assets of $1.5 billion and $1.6 billion at January 1, 2019, and June 30, 2019 , respectively, and recognized $225 million of expense during the six months ended June 30, 2019 . We had deferred insurance assets of $1.4 billion and $1.5 billion at January 1, 2018, and June 30, 2018 , respectively, and recognized $209 million of expense during the six months ended June 30, 2018 . (c) Represents a component of total net revenue. Refer to Note 21 for further information on our reportable operating segments.

Other Income, Net of Losses (Ta

Other Income, Net of Losses (Tables)	6 Months Ended
	Jun. 30, 2019
Other Nonoperating Income (Expense) [Abstract]
Schedule of Other Nonoperating Income, by Component	Details of other income, net of losses, were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Late charges and other administrative fees $ 28 $ 25 $ 57 $ 54 Remarketing fees 19 21 37 44 Income from equity-method investments 8 7 12 13 Servicing fees 4 8 10 16 Other, net 34 36 64 79 Total other income, net of losses $ 93 $ 97 $ 180 $ 206

Reserves for Insurance Losses_2

Reserves for Insurance Losses and Loss Adjustment Expenses Reserves for Insurance Losses and Loss Adjustment Expenses (Tables)	6 Months Ended
	Jun. 30, 2019
Reserves for Insurance Losses and Loss Adjustment Expenses [Abstract]
Short-Duration Insurance and Deposit Contracts [Text Block]	The following table shows a rollforward of our reserves for insurance losses and loss adjustment expenses. ($ in millions) 2019 2018 Total gross reserves for insurance losses and loss adjustment expenses at January 1, $ 134 $ 140 Less: Reinsurance recoverable 96 108 Net reserves for insurance losses and loss adjustment expenses at January 1, 38 32 Net insurance losses and loss adjustment expenses incurred related to: Current year 186 159 Prior years (a) — 5 Total net insurance losses and loss adjustment expenses incurred 186 164 Net insurance losses and loss adjustment expenses paid or payable related to: Current year (134 ) (121 ) Prior years (27 ) (26 ) Total net insurance losses and loss adjustment expenses paid or payable (161 ) (147 ) Net reserves for insurance losses and loss adjustment expenses at June 30, 63 49 Plus: Reinsurance recoverable 90 100 Total gross reserves for insurance losses and loss adjustment expenses at June 30, $ 153 $ 149 (a) There have been no material adverse changes to the reserve for prior years.

Other Operating Expenses (Table

Other Operating Expenses (Tables)	6 Months Ended
	Jun. 30, 2019
Operating Expenses [Abstract]
Schedule of Other Operating Cost and Expense, by Component	Details of other operating expenses were as follows. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Insurance commissions $ 117 $ 109 $ 231 $ 219 Technology and communications 73 74 150 145 Advertising and marketing 35 29 83 68 Lease and loan administration 43 40 82 82 Professional services 30 35 59 67 Regulatory and licensing fees 28 35 56 65 Vehicle remarketing and repossession 25 26 52 58 Premises and equipment depreciation 25 22 47 42 Occupancy 16 11 29 22 Non-income taxes 11 6 20 14 Amortization of intangible assets 3 3 6 6 Other 52 56 96 103 Total other operating expenses $ 458 $ 446 $ 911 $ 891

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Our investment portfolio includes various debt and equity securities. Our debt securities, which are classified as available-for-sale or held-to-maturity, include government securities, corporate bonds, asset-backed securities, and mortgage-backed securities. The cost, fair value, and gross unrealized gains and losses on available-for-sale and held-to-maturity debt securities were as follows. June 30, 2019 December 31, 2018 Amortized cost Gross unrealized Fair value Amortized cost Gross unrealized Fair value ($ in millions) gains losses gains losses Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ 2,023 $ 7 $ (12 ) $ 2,018 $ 1,911 $ — $ (60 ) $ 1,851 U.S. States and political subdivisions 585 13 — 598 816 3 (17 ) 802 Foreign government 146 3 — 149 145 1 (1 ) 145 Agency mortgage-backed residential 18,971 191 (62 ) 19,100 17,486 47 (395 ) 17,138 Mortgage-backed residential 2,927 18 (11 ) 2,934 2,796 1 (111 ) 2,686 Agency mortgage-backed commercial 1,303 48 — 1,351 3 — — 3 Mortgage-backed commercial 712 2 (1 ) 713 715 1 (2 ) 714 Asset-backed 473 4 — 477 723 2 (2 ) 723 Corporate debt 1,326 25 (3 ) 1,348 1,286 1 (46 ) 1,241 Total available-for-sale securities (a) (b) (c) $ 28,466 $ 311 $ (89 ) $ 28,688 $ 25,881 $ 56 $ (634 ) $ 25,303 Held-to-maturity securities Debt securities Agency mortgage-backed residential (d) $ 2,430 $ 41 $ (3 ) $ 2,468 $ 2,319 $ 6 $ (61 ) $ 2,264 Asset-backed retained notes 31 — — 31 43 — — 43 Total held-to-maturity securities $ 2,461 $ 41 $ (3 ) $ 2,499 $ 2,362 $ 6 $ (61 ) $ 2,307 (a) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $12 million at both June 30, 2019 , and December 31, 2018 , respectively. (b) Certain available-for-sale securities are included in fair value hedging relationships. Refer to Note 17 for additional information. (c) Available-for-sale securities with a fair value of $4.4 billion and $9.2 billion at June 30, 2019 , and December 31, 2018 , respectively, were pledged to secure advances from the Federal Home Loan Bank (FHLB), short-term borrowings or repurchase agreements, or for other purposes as required by contractual obligation or law. Under these agreements, we have granted the counterparty the right to sell or pledge $615 million and $821 million of the underlying investment securities at June 30, 2019 , and December 31, 2018 , respectively. (d) Held-to-maturity securities with a fair value of $1.3 billion and $1.2 billion at June 30, 2019 , and December 31, 2018, respectively, were pledged to secure advances from the FHLB.
Investments Classified by Contractual Maturity Date	The maturity distribution of debt securities outstanding is summarized in the following tables. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2019 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 2,018 1.7 % $ 73 2.0 % $ 1,430 1.6 % $ 515 1.8 % $ — — % U.S. States and political subdivisions 598 3.1 33 3.3 47 2.3 153 2.8 365 3.4 Foreign government 149 2.3 4 1.2 67 2.2 78 2.4 — — Agency mortgage-backed residential 19,100 3.4 — — — — 50 1.9 19,050 3.4 Mortgage-backed residential 2,934 3.3 — — — — — — 2,934 3.3 Agency mortgage-backed commercial 1,351 3.1 — — 3 3.2 932 3.1 416 3.1 Mortgage-backed commercial 713 3.7 — — — — 36 3.9 677 3.7 Asset-backed 477 3.4 — — 328 3.4 74 3.9 75 3.1 Corporate debt 1,348 3.2 143 3.0 549 3.0 634 3.4 22 5.6 Total available-for-sale securities $ 28,688 3.2 $ 253 2.7 $ 2,424 2.2 $ 2,472 2.9 $ 23,539 3.4 Amortized cost of available-for-sale securities $ 28,466 $ 253 $ 2,420 $ 2,412 $ 23,381 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 2,430 3.2 % $ — — % $ — — % $ — — % $ 2,430 3.2 % Asset-backed retained notes 31 3.1 — — 31 2.1 — — — — Total held-to-maturity securities $ 2,461 3.2 $ — — $ 31 2.1 $ — — $ 2,430 3.2 December 31, 2018 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 1,851 1.9 % $ 12 1.0 % $ 1,277 1.8 % $ 562 2.0 % $ — — % U.S. States and political subdivisions 802 3.0 49 1.9 43 2.3 252 2.6 458 3.4 Foreign government 145 2.4 18 3.1 60 2.3 67 2.4 — — Agency mortgage-backed residential 17,138 3.3 — — — — 54 1.9 17,084 3.3 Mortgage-backed residential 2,686 3.3 — — — — — — 2,686 3.3 Agency mortgage-backed commercial 3 3.1 — — 3 3.1 — — — — Mortgage-backed commercial 714 3.8 — — — — 46 3.9 668 3.8 Asset-backed 723 3.5 — — 478 3.4 121 4.0 124 3.3 Corporate debt 1,241 3.1 144 2.8 496 2.9 581 3.3 20 5.5 Total available-for-sale securities $ 25,303 3.2 $ 223 2.6 $ 2,357 2.4 $ 1,683 2.8 $ 21,040 3.3 Amortized cost of available-for-sale securities $ 25,881 $ 224 $ 2,405 $ 1,743 $ 21,509 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 2,319 3.2 % $ — — % $ — — % $ — — % $ 2,319 3.2 % Asset-backed retained notes 43 2.0 — — 42 2.0 1 3.3 — — Total held-to-maturity securities $ 2,362 3.2 $ — — $ 42 2.0 $ 1 3.3 $ 2,319 3.2 (a) Yield is calculated using the effective yield of each security at the end of the period, weighted based on the market value. The effective yield considers the contractual coupon and amortized cost, and excludes expected capital gains and losses.
Investment Income	The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Taxable interest $ 220 $ 164 $ 434 $ 318 Taxable dividends 3 3 6 6 Interest and dividends exempt from U.S. federal income tax 4 6 9 12 Interest and dividends on investment securities $ 227 $ 173 $ 449 $ 336
Schedule of Realized Gain (Loss)	The following table presents gross gains and losses realized upon the sales of available-for-sale securities, and net gains or losses on equity securities held during the period. There were no other-than-temporary impairments of available-for-sale securities for the periods presented. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Available-for-sale securities Gross realized gains $ 24 $ 1 $ 34 $ 7 Gross realized losses (a) — — (1 ) — Net realized gains on available-for-sale securities 24 1 33 7 Net realized gain on equity securities 10 18 39 40 Net unrealized gain (loss) on equity securities 5 8 75 (32 ) Other gain on investments, net $ 39 $ 27 $ 147 $ 15 (a) Certain available-for-sale securities were sold at a loss during the three months and six months ended June 30, 2019 , and June 30, 2018 , as a result of market conditions within these periods (e.g., a downgrade in the rating of a debt security) or a loss was realized based on corporate actions outside of our control (such as a call by the issuer). Any such sales were made in accordance with our risk-management policies and practices.
Schedule of Unrealized Loss on Investments	The table below summarizes available-for-sale and held-to-maturity securities in an unrealized loss position, which we evaluated for other than temporary impairment. For additional information on our methodology, refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K. As of June 30, 2019 , we did not have the intent to sell the available-for-sale or held-to-maturity securities with an unrealized loss position and we do not believe it is more likely than not that we will be required to sell these securities before recovery of their amortized cost basis. As a result of this evaluation, we believe that the securities with an unrealized loss position are not considered to be other-than-temporarily impaired at June 30, 2019 . June 30, 2019 December 31, 2018 Less than 12 months 12 months or longer Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Fair value Unrealized loss Available-for-sale securities Debt securities U.S. Treasury and federal agencies $ — $ — $ 1,532 $ (12 ) $ 31 $ — $ 1,758 $ (60 ) U.S. States and political subdivisions — — 46 — 259 (3 ) 317 (14 ) Foreign government 5 — 8 — 6 — 74 (1 ) Agency mortgage-backed residential 1,033 (1 ) 5,713 (61 ) 5,537 (94 ) 7,808 (301 ) Mortgage-backed residential 26 — 1,235 (11 ) 1,024 (20 ) 1,360 (91 ) Agency mortgage-backed commercial 10 — — — — — — — Mortgage-backed commercial 280 (1 ) — — 347 (1 ) 36 (1 ) Asset-backed 6 — 75 — 294 (1 ) 124 (1 ) Corporate debt 35 — 256 (3 ) 576 (19 ) 569 (27 ) Total temporarily impaired available-for-sale securities $ 1,395 $ (2 ) $ 8,865 $ (87 ) $ 8,074 $ (138 ) $ 12,046 $ (496 ) Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 447 $ (3 ) $ — $ — $ 457 $ (6 ) $ 1,376 $ (55 ) Asset-backed retained notes 11 — — — 16 — 19 — Total held-to-maturity debt securities $ 458 $ (3 ) $ — $ — $ 473 $ (6 ) $ 1,395 $ (55 )

Finance Receivables and Loans_2

Finance Receivables and Loans, Net (Tables)	6 Months Ended
	Jun. 30, 2019
Loans and Leases Receivable, Net Amount [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The composition of finance receivables and loans reported at gross carrying value was as follows. ($ in millions) June 30, 2019 December 31, 2018 Consumer automotive (a) $ 72,898 $ 70,539 Consumer mortgage Mortgage Finance (b) 16,485 15,155 Mortgage — Legacy (c) 1,315 1,546 Total consumer mortgage 17,800 16,701 Total consumer 90,698 87,240 Commercial Commercial and industrial Automotive 29,382 33,672 Other 4,353 4,205 Commercial real estate 4,777 4,809 Total commercial 38,512 42,686 Total finance receivables and loans (d) $ 129,210 $ 129,926 (a) Certain finance receivables and loans are included in fair value hedging relationships. Refer to Note 17 for additional information. (b) Includes loans originated as interest-only mortgage loans of $12 million and $18 million at June 30, 2019 , and December 31, 2018 , respectively, 34% of which are expected to start principal amortization in 2019, and 41% in 2020 . The remainder of these loans have exited the interest-only period. (c) Includes loans originated as interest-only mortgage loans of $263 million and $341 million at June 30, 2019 , and December 31, 2018 , respectively, of which 99% have exited the interest-only period. (d) Totals include net unearned income, unamortized premiums and discounts, and deferred fees and costs of $577 million and $587 million at June 30, 2019 , and December 31, 2018 , respectively.
Allowance for Credit Losses on Financing Receivables	The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans. Three months ended June 30, 2019 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2019 $ 1,070 $ 52 $ 166 $ 1,288 Charge-offs (a) (301 ) (5 ) (12 ) (318 ) Recoveries 129 7 — 136 Net charge-offs (172 ) 2 (12 ) (182 ) Provision for loan losses 180 (5 ) 2 177 Other — — (1 ) (1 ) Allowance at June 30, 2019 $ 1,078 $ 49 $ 155 $ 1,282 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. Three months ended June 30, 2018 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at April 1, 2018 $ 1,066 $ 74 $ 138 $ 1,278 Charge-offs (a) (296 ) (8 ) (2 ) (306 ) Recoveries 114 6 6 126 Net charge-offs (182 ) (2 ) 4 (180 ) Provision for loan losses 168 (4 ) (6 ) 158 Other 1 (2 ) 2 1 Allowance at June 30, 2018 $ 1,053 $ 66 $ 138 $ 1,257 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. Six months ended June 30, 2019 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2019 $ 1,048 $ 53 $ 141 $ 1,242 Charge-offs (a) (653 ) (8 ) (17 ) (678 ) Recoveries 247 12 — 259 Net charge-offs (406 ) 4 (17 ) (419 ) Provision for loan losses 437 (8 ) 30 459 Other (1 ) — 1 — Allowance at June 30, 2019 $ 1,078 $ 49 $ 155 $ 1,282 Allowance for loan losses at June 30, 2019 Individually evaluated for impairment $ 42 $ 20 $ 49 $ 111 Collectively evaluated for impairment 1,036 29 106 1,171 Finance receivables and loans at gross carrying value Ending balance $ 72,898 $ 17,800 $ 38,512 $ 129,210 Individually evaluated for impairment 496 220 196 912 Collectively evaluated for impairment 72,402 17,580 38,316 128,298 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies. Six months ended June 30, 2018 ($ in millions) Consumer automotive Consumer mortgage Commercial Total Allowance at January 1, 2018 $ 1,066 $ 79 $ 131 $ 1,276 Charge-offs (a) (661 ) (20 ) (2 ) (683 ) Recoveries 226 12 6 244 Net charge-offs (435 ) (8 ) 4 (439 ) Provision for loan losses 421 (3 ) 1 419 Other 1 (2 ) 2 1 Allowance at June 30, 2018 $ 1,053 $ 66 $ 138 $ 1,257 Allowance for loan losses at June 30, 2018 Individually evaluated for impairment $ 42 $ 24 $ 27 $ 93 Collectively evaluated for impairment 1,011 42 111 1,164 Finance receivables and loans at gross carrying value Ending balance $ 70,473 $ 15,131 $ 39,940 $ 125,544 Individually evaluated for impairment 480 228 198 906 Collectively evaluated for impairment 69,993 14,903 39,742 124,638 (a) Represents the amount of the gross carrying value directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the gross carrying value of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for more information regarding our charge-off policies.
Schedule Of Sales Of Financing Receivables And Loans	The following table presents information about significant sales of finance receivables and loans and transfers of finance receivables and loans from held-for-investment to held-for-sale based on net carrying value. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Consumer automotive $ — $ — $ 20 $ — Consumer mortgage — 4 — 5 Total sales and transfers (a) $ — $ 4 $ 20 $ 5 (a) During the six months ended June 30, 2019 , we also sold $131 million of loans held-for-sale that were initially classified as finance receivables and loans held-for-investment, and transferred $79 million of finance receivables from held-for-sale to held-for-investment, both relating to equipment finance receivables from our commercial automotive business.
Schedule of Purchases of Financing Receivables and Loans	The following table presents information about significant purchases of finance receivables and loans based on unpaid principal balance at the time of purchase. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Consumer automotive $ 218 $ 233 $ 317 $ 401 Consumer mortgage 678 852 1,913 2,147 Commercial 3 — 3 — Total purchases of finance receivables and loans $ 899 $ 1,085 $ 2,233 $ 2,548
Past Due Financing Receivables	The following table presents an analysis of our past-due finance receivables and loans recorded at gross carrying value. ($ in millions) 30–59 days past due 60–89 days past due 90 days or more past due Total past due Current Total finance receivables and loans June 30, 2019 Consumer automotive $ 1,802 $ 444 $ 273 $ 2,519 $ 70,379 $ 72,898 Consumer mortgage Mortgage Finance 77 9 9 95 16,390 16,485 Mortgage — Legacy 32 13 30 75 1,240 1,315 Total consumer mortgage 109 22 39 170 17,630 17,800 Total consumer 1,911 466 312 2,689 88,009 90,698 Commercial Commercial and industrial Automotive 3 — 67 70 29,312 29,382 Other — — 2 2 4,351 4,353 Commercial real estate — — 4 4 4,773 4,777 Total commercial 3 — 73 76 38,436 38,512 Total consumer and commercial $ 1,914 $ 466 $ 385 $ 2,765 $ 126,445 $ 129,210 December 31, 2018 Consumer automotive $ 2,107 $ 537 $ 296 $ 2,940 $ 67,599 $ 70,539 Consumer mortgage Mortgage Finance 67 5 4 76 15,079 15,155 Mortgage — Legacy 30 10 42 82 1,464 1,546 Total consumer mortgage 97 15 46 158 16,543 16,701 Total consumer 2,204 552 342 3,098 84,142 87,240 Commercial Commercial and industrial Automotive — 1 31 32 33,640 33,672 Other — 4 16 20 4,185 4,205 Commercial real estate — — 1 1 4,808 4,809 Total commercial — 5 48 53 42,633 42,686 Total consumer and commercial $ 2,204 $ 557 $ 390 $ 3,151 $ 126,775 $ 129,926
Schedule of Financing Receivables, Non Accrual Status	The following table presents the gross carrying value of our finance receivables and loans on nonaccrual status. ($ in millions) June 30, 2019 December 31, 2018 Consumer automotive $ 642 $ 664 Consumer mortgage Mortgage Finance 12 9 Mortgage — Legacy 53 70 Total consumer mortgage 65 79 Total consumer 707 743 Commercial Commercial and industrial Automotive 89 203 Other 101 142 Commercial real estate 6 4 Total commercial 196 349 Total consumer and commercial finance receivables and loans $ 903 $ 1,092
Financing Receivable Credit Quality Indicators	The following table presents performing and nonperforming credit quality indicators in accordance with our internal accounting policies for our consumer finance receivables and loans recorded at gross carrying value. Nonperforming loans include finance receivables and loans on nonaccrual status when the principal or interest has been delinquent for 90 days or more, or when full collection is not expected. Refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for additional information. June 30, 2019 December 31, 2018 ($ in millions) Performing Nonperforming Total Performing Nonperforming Total Consumer automotive $ 72,256 $ 642 $ 72,898 $ 69,875 $ 664 $ 70,539 Consumer mortgage Mortgage Finance 16,473 12 16,485 15,146 9 15,155 Mortgage — Legacy 1,262 53 1,315 1,476 70 1,546 Total consumer mortgage 17,735 65 17,800 16,622 79 16,701 Total consumer $ 89,991 $ 707 $ 90,698 $ 86,497 $ 743 $ 87,240
Schedule Of Pass And Criticized Credit Quality Indicators Of Finance Receivables	The following table presents pass and criticized credit quality indicators based on regulatory definitions for our commercial finance receivables and loans recorded at gross carrying value. June 30, 2019 December 31, 2018 ($ in millions) Pass Criticized (a) Total Pass Criticized (a) Total Commercial and industrial Automotive $ 26,629 $ 2,753 $ 29,382 $ 30,799 $ 2,873 $ 33,672 Other 3,580 773 4,353 3,373 832 4,205 Commercial real estate 4,517 260 4,777 4,538 271 4,809 Total commercial $ 34,726 $ 3,786 $ 38,512 $ 38,710 $ 3,976 $ 42,686 (a) Includes loans classified as special mention, substandard, or doubtful. These classifications are based on regulatory definitions and generally represent loans within our portfolio that have a higher default risk or have already defaulted.
Impaired Financing Receivables	The following table presents information about our impaired finance receivables and loans. ($ in millions) Unpaid principal balance (a) Gross carrying value Impaired with no allowance Impaired with an allowance Allowance for impaired loans June 30, 2019 Consumer automotive $ 506 $ 496 $ 101 $ 395 $ 42 Consumer mortgage Mortgage Finance 14 14 6 8 — Mortgage — Legacy 211 206 65 141 20 Total consumer mortgage 225 220 71 149 20 Total consumer 731 716 172 544 62 Commercial Commercial and industrial Automotive 89 89 18 71 19 Other 122 101 55 46 30 Commercial real estate 6 6 6 — — Total commercial 217 196 79 117 49 Total consumer and commercial finance receivables and loans $ 948 $ 912 $ 251 $ 661 $ 111 December 31, 2018 Consumer automotive $ 503 $ 495 $ 105 $ 390 $ 44 Consumer mortgage Mortgage Finance 15 15 6 9 1 Mortgage — Legacy 221 216 65 151 22 Total consumer mortgage 236 231 71 160 23 Total consumer 739 726 176 550 67 Commercial Commercial and industrial Automotive 203 203 112 91 10 Other 159 142 40 102 46 Commercial real estate 4 4 4 — — Total commercial 366 349 156 193 56 Total consumer and commercial finance receivables and loans $ 1,105 $ 1,075 $ 332 $ 743 $ 123 (a) Adjusted for charge-offs.
Schedule of Average Balance And Interest Income Of Impaired Finance Receivables	The following tables present average balance and interest income for our impaired finance receivables and loans. 2019 2018 Three months ended June 30, ($ in millions) Average balance Interest income Average balance Interest income Consumer automotive $ 498 $ 9 $ 472 $ 7 Consumer mortgage Mortgage Finance 14 — 9 — Mortgage — Legacy 209 2 219 3 Total consumer mortgage 223 2 228 3 Total consumer 721 11 700 10 Commercial Commercial and industrial Automotive 113 — 78 1 Other 108 — 82 — Commercial real estate 6 — 5 — Total commercial 227 — 165 1 Total consumer and commercial finance receivables and loans $ 948 $ 11 $ 865 $ 11 2019 2018 Six months ended June 30, ($ in millions) Average balance Interest income Average balance Interest income Consumer automotive $ 498 $ 17 $ 462 $ 14 Consumer mortgage Mortgage Finance 15 — 9 — Mortgage — Legacy 211 5 220 5 Total consumer mortgage 226 5 229 5 Total consumer 724 22 691 19 Commercial Commercial and industrial Automotive 143 1 61 2 Other 117 — 66 — Commercial real estate 6 — 4 — Total commercial 266 1 131 2 Total consumer and commercial finance receivables and loans $ 990 $ 23 $ 822 $ 21
Troubled Debt Restructurings on Financing Receivables	The following tables present information related to finance receivables and loans recorded at gross carrying value modified in connection with a TDR during the period. 2019 2018 Three months ended June 30, ($ in millions) Number of loans Pre-modification gross carrying value Post-modification gross carrying value Number of loans Pre-modification gross carrying value Post-modification gross carrying value Consumer automotive 5,598 $ 96 $ 85 5,898 $ 107 $ 93 Consumer mortgage Mortgage Finance 2 — — 7 2 2 Mortgage — Legacy 18 3 3 27 6 7 Total consumer mortgage 20 3 3 34 8 9 Total consumer 5,618 99 88 5,932 115 102 Commercial Commercial and industrial Automotive — — — 3 4 4 Other 1 22 6 2 55 51 Total commercial 1 22 6 5 59 55 Total consumer and commercial finance receivables and loans 5,619 $ 121 $ 94 5,937 $ 174 $ 157 2019 2018 Six months ended June 30, ($ in millions) Number of loans Pre-modification gross carrying value Post-modification gross carrying value Number of loans Pre-modification gross carrying value Post-modification gross carrying value Consumer automotive 13,025 $ 225 $ 196 12,940 $ 235 $ 203 Consumer mortgage Mortgage Finance 3 — — 8 3 3 Mortgage — Legacy 38 6 6 89 16 16 Total consumer mortgage 41 6 6 97 19 19 Total consumer 13,066 231 202 13,037 254 222 Commercial Commercial and industrial Automotive 6 41 41 3 4 4 Other 1 22 6 2 55 51 Total commercial 7 63 47 5 59 55 Total consumer and commercial finance receivables and loans 13,073 $ 294 $ 249 13,042 $ 313 $ 277
Finance receivables and loans redefaulted during the period	The following tables present information about finance receivables and loans recorded at gross carrying value that have redefaulted during the reporting period and were within twelve months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 to the Consolidated Financial Statements in our 2018 Annual Report on Form 10-K for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2019 2018 Three months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 1,752 $ 20 $ 12 2,425 $ 29 $ 17 Consumer mortgage Mortgage — Legacy — — — 1 — — Total consumer finance receivables and loans 1,752 $ 20 $ 12 2,426 $ 29 $ 17 2019 2018 Six months ended June 30, ($ in millions) Number of loans Gross carrying value Charge-off amount Number of loans Gross carrying value Charge-off amount Consumer automotive 3,961 $ 46 $ 28 4,751 $ 57 $ 35 Consumer mortgage Mortgage — Legacy — — — 1 — — Total consumer finance receivables and loans 3,961 $ 46 $ 28 4,752 $ 57 $ 35

Leasing (Tables)

Leasing (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Investment in Operating Leases	The following table details our total investment in operating leases. ($ in millions) June 30, 2019 January 1, 2019 (a) Assets Operating lease right-of-use assets (b) $ 172 $ 161 Liabilities Operating lease liabilities (c) $ 200 $ 190 (a) Date of adoption. (b) Included in other assets on our Condensed Consolidated Balance Sheet . (c) Included in accrued expenses and other liabilities on our Condensed Consolidated Balance Sheet .
Lessee, Operating Lease, Liability, Maturity	The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2019 , and that have noncancellable lease terms expiring after June 30, 2019 . ($ in millions) 2019 $ 25 2020 48 2021 37 2022 25 2023 16 2024 and thereafter 71 Total undiscounted cash flows 222 Difference between undiscounted cash flows and discounted cash flows (22 ) Total lease liability $ 200
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum rental payments required under operating leases as of December 31, 2018, prior to the date of adoption and as defined by the previous lease accounting guidance, with noncancellable lease terms expiring after December 31, 2018, were as follows. Year ended December 31, ($ in millions) 2019 $ 48 2020 47 2021 46 2022 37 2023 31 2024 and thereafter 294 Total minimum payments required $ 503
Lease, Cost	The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Operating lease expense $ 12 $ 11 $ 23 $ 21 Variable lease expense 2 1 4 3 Total lease expense, net (a) $ 14 $ 12 $ 27 $ 24 (a) Included in other operating expenses in our Condensed Consolidated Statement of Comprehensive Income
Schedule of Property Subject to or Available for Operating Lease	The following table details our investment in operating leases. ($ in millions) June 30, 2019 December 31, 2018 Vehicles $ 9,961 $ 9,995 Accumulated depreciation (1,554 ) (1,578 ) Investment in operating leases, net $ 8,407 $ 8,417
Lessor, Operating Lease, Payments to be Received, Maturity	The following table presents future minimum rental payments we have the right to receive under operating leases with noncancellable lease terms expiring after June 30, 2019 . ($ in millions) 2019 $ 726 2020 1,062 2021 536 2022 129 2023 16 2024 and thereafter 1 Total lease payments from operating leases $ 2,470
Depreciation Expense on Operating Lease Assets	We recognized $363 million and $724 million , and $374 million and $756 million in operating lease revenue for the three months and six months ended June 30, 2019 , and June 30, 2018 , respectively. Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Depreciation expense on operating lease assets (excluding remarketing gains) (a) $ 262 $ 281 $ 523 $ 572 Remarketing gains, net (23 ) (16 ) (38 ) (34 ) Net depreciation expense on operating lease assets $ 239 $ 265 $ 485 $ 538 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles $5 million and $9 million during the three and six months ended June 30, 2019, respectively, and $6 million and $13 million during the three and six months ended June 30, 2018.
Finance Lease, Liability, Maturity	The following table presents future minimum rental payments we have the right to receive under finance leases with noncancellable lease terms expiring after June 30, 2019 . ($ in millions) 2019 $ 82 2020 157 2021 142 2022 79 2023 46 2024 and thereafter 32 Total undiscounted cash flows 538 Difference between undiscounted cash flows and discounted cash flows (60 ) Present value of lease payments recorded as lease receivable $ 478

Securitizations and Variable _2

Securitizations and Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2019
Securitizations And Variable Interest Entities [Abstract]
Schedule of Variable Interest Entities	The following table presents our involvement in consolidated and nonconsolidated VIEs in which we hold variable interests. For additional detail related to the assets and liabilities of consolidated variable interest entities refer to the Condensed Consolidated Balance Sheet . ($ in millions) Carrying value of total assets Carrying value of total liabilities Assets sold to nonconsolidated VIEs (a) Maximum exposure to loss in nonconsolidated VIEs June 30, 2019 On-balance sheet variable interest entities Consumer automotive $ 16,123 (b) $ 6,016 (c) Commercial automotive 9,077 3,047 Off-balance sheet variable interest entities Consumer automotive 33 (d) — $ 796 $ 829 (e) Commercial other 926 (f) 329 (g) — 1,187 (h) Total $ 26,159 $ 9,392 $ 796 $ 2,016 December 31, 2018 On-balance sheet variable interest entities Consumer automotive $ 16,255 (b) $ 6,573 (c) Commercial automotive 11,089 3,946 Off-balance sheet variable interest entities Consumer automotive 45 (d) — $ 1,235 $ 1,280 (e) Commercial other 806 (f) 326 (g) — 1,054 (h) Total $ 28,195 $ 10,845 $ 1,235 $ 2,334 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $8.5 billion and $8.4 billion of assets that were not encumbered by VIE beneficial interests held by third parties at June 30, 2019 , and December 31, 2018 , respectively. Ally or consolidated affiliates hold the interests in these assets. (c) Includes $22 million and $25 million of liabilities that were not obligations to third-party beneficial interest holders at June 30, 2019 , and December 31, 2018 , respectively. (d) Represents retained notes and certificated residual interests, of which $31 million and $43 million were classified as held-to-maturity securities at June 30, 2019 , and December 31, 2018 , respectively, and $2 million was classified as other assets at both June 30, 2019 , and December 31, 2018 . These assets represent our five percent interest in the credit risk of the assets underlying asset-backed securitizations. (e) Maximum exposure to loss represents the current unpaid principal balance of outstanding loans, retained notes, certificated residual interests, as well as certain noncertificated interests retained from the sale of automotive finance receivables. This measure is based on the very unlikely event that all of our sold loans have defects that would trigger a representation and warranty provision and the underlying collateral supporting the loans becomes worthless. This required disclosure is not an indication of our expected loss. (f) Amounts are classified as other assets. (g) Amounts are classified as accrued expenses and other liabilities. (h) For certain nonconsolidated affordable housing entities, maximum exposure to loss represents the yield we guaranteed investors through long-term guarantee contracts. The amount disclosed is based on the unlikely event that the underlying properties cease generating yield to investors and the yield delivered to investors in the form of low income tax housing credits is recaptured. For nonconsolidated equity investments, maximum exposure to loss represents our outstanding investment, additional committed capital, and low income housing tax credits subject to recapture. The amount disclosed is based on the unlikely event that our committed capital is funded, our investments become worthless, and the tax credits previously delivered to us are recaptured. This required disclosure is not an indication of our expected loss.
Schedule Of Cash Flow Received And Paid To Nonconsolidated Securitization Entities	The following table summarizes cash flows received and paid related to SPEs and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred consumer automotive assets (e.g., servicing) that were outstanding during the six months ended June 30, 2019 , and 2018 . Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated SPEs that existed during each period. Six months ended June 30, ($ in millions) Consumer automotive Consumer mortgage 2019 Cash flows received on retained interests in securitization entities $ 13 $ — Servicing fees 6 — Cash disbursements for repurchases during the period (1 ) — 2018 Cash flows received on retained interests in securitization entities $ 9 $ — Servicing fees 10 — Cash disbursements for repurchases during the period (2 ) — Representations and warranty recoveries — 2
Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together	The following tables present quantitative information about delinquencies and net credit losses for off-balance sheet securitizations and whole-loan sales where we have continuing involvement. Total amount Amount 60 days or more past due ($ in millions) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Off-balance sheet securitization entities Consumer automotive $ 796 $ 1,235 $ 9 $ 13 Whole-loan sales (a) Consumer automotive 392 634 2 3 Total $ 1,188 $ 1,869 $ 11 $ 16 (a) Whole-loan sales are not part of a securitization transaction, but represent consumer automotive pools of loans sold to third-party investors. Net credit losses Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Off-balance sheet securitization entities Consumer automotive $ 2 $ 2 $ 4 $ 5 Whole-loan sales (a) Consumer automotive 1 — 1 1 Total $ 3 $ 2 $ 5 $ 6 (a) Whole-loan sales are not part of a securitization transaction, but represent consumer automotive pools of loans sold to third-party investors.

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Other Assets [Abstract]
Schedule of Other Assets	The components of other assets were as follows. ($ in millions) June 30, 2019 December 31, 2018 Property and equipment at cost $ 1,245 $ 1,250 Accumulated depreciation (640 ) (686 ) Net property and equipment 605 564 Nonmarketable equity investments (a) 1,303 1,410 Investment in qualified affordable housing projects (b) 724 649 Accrued interest, fees, and rent receivables 631 599 Restricted cash held for securitization trusts (c) 608 965 Other accounts receivable 396 203 Equity-method investments (d) 317 262 Goodwill (e) 240 240 Net deferred tax assets 173 317 Restricted cash and cash equivalents (f) 99 124 Fair value of derivative contracts in receivable position (g) 59 41 Cash collateral placed with counterparties 9 26 Other assets 911 753 Total other assets $ 6,075 $ 6,153 (a) Includes investments in FHLB stock of $778 million and $903 million at June 30, 2019 , and December 31, 2018 , respectively; Federal Reserve Bank (FRB) stock of $448 million at both June 30, 2019 , and December 31, 2018 ; and equity securities without a readily determinable fair value of $77 million and $59 million at June 30, 2019 , and December 31, 2018 , respectively, measured at cost with adjustments for impairment and observable changes in price. During the three months and six months ended June 30, 2019 , we recorded $7 million of upward adjustments related to equity securities without a readily determinable fair value. Through June 30, 2019 , we recorded $7 million of cumulative upward adjustments and $3 million of cumulative impairments and downward adjustments related to equity securities without a readily determinable fair value. (b) Investment in qualified affordable housing projects are accounted for using the proportional amortization method of accounting and include $322 million and $319 million of unfunded commitments to provide additional capital contributions to investees at June 30, 2019 , and December 31, 2018 , respectively. Substantially all of the unfunded commitments at June 30, 2019 , are expected to be paid out over the next five years. (c) Includes restricted cash collected from customer payments on securitized receivables, which are distributed by us to investors as payments on the related secured debt, and cash reserve deposits utilized as a form of credit enhancement for various securitization transactions. (d) Primarily relates to investments made in connection with our Community Reinvestment Act (CRA) program. (e) Includes goodwill of $27 million within our Insurance operations at both June 30, 2019 , and December 31, 2018 ; $193 million within Corporate and Other at both June 30, 2019 , and December 31, 2018 ; and $20 million within Automotive Finance operations at both June 30, 2019 , and December 31, 2018 . No changes to the carrying amount of goodwill were recorded during the six months ended June 30, 2019 . (f) Primarily represents a number of arrangements with third parties where certain restrictions are placed on balances we hold due to collateral agreements associated with operational processes with a third-party bank, or letter of credit arrangements and corresponding collateral requirements. (g) For additional information on derivative instruments and hedging activities, refer to Note 17 .

Deposit Liabilities (Tables)

Deposit Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Deposits [Abstract]
Deposit Liabilities, Type	Deposit liabilities consisted of the following. ($ in millions) June 30, 2019 December 31, 2018 Noninterest-bearing deposits $ 162 $ 142 Interest-bearing deposits Savings and money-market checking accounts 62,078 56,050 Certificates of deposit 54,084 49,985 Other deposits 1 1 Total deposit liabilities $ 116,325 $ 106,178

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Short-term Debt	The following table presents the composition of our short-term borrowings portfolio. June 30, 2019 December 31, 2018 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes $ 2,462 $ — $ 2,462 $ 2,477 $ — $ 2,477 Federal Home Loan Bank — 3,625 3,625 — 6,825 6,825 Securities sold under agreements to repurchase — 432 432 — 685 685 Total short-term borrowings $ 2,462 $ 4,057 $ 6,519 $ 2,477 $ 7,510 $ 9,987 (a) Refer to the section below titled Long-term Debt for further details on assets restricted as collateral for payment of the related debt.
Long-term Debt	The following table presents the composition of our long-term debt portfolio. June 30, 2019 December 31, 2018 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt (a) Due within one year $ 2,613 $ 6,714 $ 9,327 $ 1,663 $ 7,313 $ 8,976 Due after one year 9,458 18,681 28,139 10,444 24,773 35,217 Total long-term debt (b) (c) $ 12,071 $ 25,395 $ 37,466 $ 12,107 $ 32,086 $ 44,193 (a) Includes basis adjustments related to the application of hedge accounting. Refer to Note 17 for additional information. (b) Includes $2.6 billion of trust preferred securities at both June 30, 2019 , and December 31, 2018 . (c) Includes advances net of hedge basis adjustment from the FHLB of Pittsburgh of $14.7 billion and $14.9 billion at June 30, 2019 , and December 31, 2018 , respectively.
Scheduled of Maturities of Long-term Debt	The following table presents the scheduled remaining maturity of long-term debt at June 30, 2019 , assuming no early redemptions will occur. The amounts below include adjustments to the carrying value resulting from the application of hedge accounting. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2019 2020 2021 2022 2023 2024 and thereafter Total Unsecured Long-term debt $ 873 $ 2,256 $ 696 $ 1,084 $ 11 $ 8,273 $ 13,193 Original issue discount (21 ) (43 ) (46 ) (51 ) (57 ) (904 ) (1,122 ) Total unsecured 852 2,213 650 1,033 (46 ) 7,369 12,071 Secured Long-term debt 2,963 6,879 9,393 5,426 557 177 25,395 Total long-term debt $ 3,815 $ 9,092 $ 10,043 $ 6,459 $ 511 $ 7,546 $ 37,466
Pledged assets for the payment of the related secured borrowings and repurchase agreements	The following summarizes assets restricted as collateral for the payment of the related debt obligation primarily arising from securitization transactions accounted for as secured borrowings and repurchase agreements. June 30, 2019 December 31, 2018 ($ in millions) Total (a) Ally Bank Total (a) Ally Bank Investment securities (b) $ 5,517 $ 5,067 $ 10,280 $ 9,564 Mortgage assets held-for-investment and lending receivables 17,589 17,589 16,498 16,498 Consumer automotive finance receivables 11,287 7,319 17,015 9,715 Commercial automotive finance receivables 13,736 13,736 15,563 15,563 Operating leases 96 — 170 — Total assets restricted as collateral (c) (d) $ 48,225 $ 43,711 $ 59,526 $ 51,340 Secured debt $ 29,452 (e) $ 25,386 $ 39,596 (e) $ 32,072 (a) Ally Bank is a component of the total column. (b) A portion of the restricted investment securities at June 30, 2019 , and December 31, 2018 , were restricted under repurchase agreements. Refer to the section above titled Short-term Borrowings for information on the repurchase agreements. (c) Ally Bank has an advance agreement with the FHLB, and had assets pledged to secure borrowings that were restricted as collateral to the FHLB totaling $27.4 billion and $30.8 billion at June 30, 2019 , and December 31, 2018 , respectively. These assets were composed primarily of consumer mortgage finance receivables and loans and investment securities. Ally Bank has access to the FRB Discount Window and had assets pledged and restricted as collateral to the FRB totaling $2.4 billion at both June 30, 2019 , and December 31, 2018 . These assets were composed of consumer automotive finance receivables and loans. Availability under these programs is only for the operations of Ally Bank and cannot be used to fund the operations or liabilities of Ally or its subsidiaries. (d) Excludes restricted cash and cash reserves for securitization trusts recorded within other assets on the Condensed Consolidated Balance Sheet . Refer to Note 10 for additional information. (e) Includes $4.1 billion and $7.5 billion of short-term borrowings at June 30, 2019 , and December 31, 2018 , respectively.
Schedule Of Committed Funding Facilities	Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Bank funding Secured $ 250 $ 3,500 $ — $ 1,300 $ 250 $ 4,800 Parent funding Secured 1,365 3,165 1,635 635 3,000 3,800 Total committed secured credit facilities $ 1,615 $ 6,665 $ 1,635 $ 1,935 $ 3,250 $ 8,600 (a) Funding from committed secured credit facilities is available on request in the event excess collateral resides in certain facilities or the extent incremental collateral is available and contributed to the facilities.

Accrued Expenses and Other Li_2

Accrued Expenses and Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Accounts Payable and Accrued Liabilities [Abstract]
Schedule of Accrued Liabilities	The components of accrued expenses and other liabilities were as follows. ($ in millions) June 30, 2019 December 31, 2018 Accounts payable $ 580 $ 516 Unfunded commitments for investment in qualified affordable housing projects 322 319 Employee compensation and benefits 197 255 Reserves for insurance losses and loss adjustment expenses 153 134 Cash collateral received from counterparties 38 41 Deferred revenue 28 27 Fair value of derivative contracts in payable position (a) 4 37 Other liabilities 585 347 Total accrued expenses and other liabilities $ 1,907 $ 1,676 (a) For additional information on derivative instruments and hedging activities, refer to Note 17 .

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	6 Months Ended
	Jun. 30, 2019
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following table presents changes, net of tax, in each component of accumulated other comprehensive (loss) income. Three months ended June 30, ($ in millions) Unrealized (losses) gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive (loss) income Balance at April 1, 2018 $ (524 ) $ 19 $ 25 $ (98 ) $ (578 ) Net change (74 ) — 3 1 (70 ) Balance at June 30, 2018 $ (598 ) $ 19 $ 28 $ (97 ) $ (648 ) Balance at April 1, 2019 $ (158 ) $ 18 $ 11 $ (96 ) $ (225 ) Net change 291 1 17 — 309 Balance at June 30, 2019 $ 133 $ 19 $ 28 $ (96 ) $ 84 Six months ended June 30, ($ in millions) Unrealized (losses) gains on investment securities (a) Translation adjustments and net investment hedges (b) Cash flow hedges (b) Defined benefit pension plans Accumulated other comprehensive (loss) income Balance at December 31, 2017 $ (173 ) $ 16 $ 11 $ (89 ) $ (235 ) Cumulative effect of changes in accounting principles, net of tax Adoption of Accounting Standards Update 2016-01 27 — — — 27 Adoption of Accounting Standards Update 2018-02 (40 ) 4 — (6 ) (42 ) Balance at January 1, 2018 (186 ) 20 11 (95 ) (250 ) Net change (412 ) (1 ) 17 (2 ) (398 ) Balance at June 30, 2018 $ (598 ) $ 19 $ 28 $ (97 ) $ (648 ) Balance at December 31, 2018 $ (481 ) $ 18 $ 19 $ (95 ) $ (539 ) Cumulative effect of changes in accounting principles, net of tax (c) Adoption of Accounting Standards Update 2017-08 8 — — — 8 Balance at January 1, 2019 (473 ) 18 19 (95 ) (531 ) Net change 606 1 9 (1 ) 615 Balance at June 30, 2019 $ 133 $ 19 $ 28 $ (96 ) $ 84 (a) Represents the after-tax difference between the fair value and amortized cost of our available-for-sale securities portfolio. (b) For additional information on derivative instruments and hedging activities, refer to Note 17 . (c) Refer to the section titled Recently Adopted Accounting Standards in Note 1 for additional information.
Reclassification out of Accumulated Other Comprehensive Income	The following tables present the before- and after-tax changes in each component of accumulated other comprehensive income (loss). Three months ended June 30, 2019 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 404 $ (95 ) $ 309 Less: Net realized gains reclassified to income from continuing operations 24 (a) (6 ) (b) 18 Net change 380 (89 ) 291 Translation adjustments Net unrealized gains arising during the period 4 (1 ) 3 Net investment hedges (c) Net unrealized losses arising during the period (3 ) 1 (2 ) Cash flow hedges (c) Net unrealized gains arising during the period 26 (6 ) 20 Less: Net realized gains reclassified to income from continuing operations 4 (1 ) 3 Net change 22 (5 ) 17 Other comprehensive income $ 403 $ (94 ) $ 309 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 . Three months ended June 30, 2018 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized losses arising during the period $ (95 ) $ 22 $ (73 ) Less: Net realized gains reclassified to income from continuing operations 1 (a) — (b) 1 Net change (96 ) 22 (74 ) Translation adjustments Net unrealized losses arising during the period (3 ) 1 (2 ) Net investment hedges (c) Net unrealized gains arising during the period 3 (1 ) 2 Cash flow hedges (c) Net unrealized gains arising during the period 5 (2 ) 3 Defined benefit pension plans Net unrealized gains arising during the period 1 — 1 Other comprehensive loss $ (90 ) $ 20 $ (70 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 . Six months ended June 30, 2019 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 825 $ (194 ) $ 631 Less: Net realized gains reclassified to income from continuing operations 33 (a) (8 ) (b) 25 Net change 792 (186 ) 606 Translation adjustments Net unrealized gains arising during the period 6 (2 ) 4 Net investment hedges (c) Net unrealized losses arising during the period (5 ) 2 (3 ) Cash flow hedges (c) Net unrealized losses arising during the period 21 (5 ) 16 Less: Net realized gains reclassified to income from continuing operations 9 (2 ) 7 Net change 12 (3 ) 9 Defined benefit pension plans Net unrealized losses arising during the period (1 ) — (1 ) Other comprehensive income $ 804 $ (189 ) $ 615 (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 . Six months ended June 30, 2018 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized losses arising during the period $ (531 ) $ 125 $ (406 ) Less: Net realized gains reclassified to income from continuing operations 7 (a) (1 ) (b) 6 Net change (538 ) 126 (412 ) Translation adjustments Net unrealized losses arising during the period (8 ) 2 (6 ) Net investment hedges (c) Net unrealized gains arising during the period 7 (2 ) 5 Cash flow hedges (c) Net unrealized gains arising during the period 23 (6 ) 17 Defined benefit pension plans Net unrealized losses arising during the period (2 ) — (2 ) Other comprehensive loss $ (518 ) $ 120 $ (398 ) (a) Includes gains reclassified to other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income . (b) Includes amounts reclassified to income tax (benefit) expense from continuing operations in our Condensed Consolidated Statement of Comprehensive Income . (c) For additional information on derivative instruments and hedging activities, refer to Note 17 .

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of basic and diluted earnings per common share. Three months ended June 30, Six months ended June 30, ($ in millions, except per share data; shares in thousands) (a) 2019 2018 2019 2018 Net income from continuing operations attributable to common stockholders $ 584 $ 348 $ 959 $ 600 (Loss) income from discontinued operations, net of tax (2 ) 1 (3 ) (1 ) Net income attributable to common stockholders $ 582 $ 349 $ 956 $ 599 Basic weighted-average common shares outstanding (b) 398,100 430,628 401,098 433,405 Diluted weighted-average common shares outstanding (b) 399,916 432,554 402,921 435,727 Basic earnings per common share Net income from continuing operations $ 1.47 $ 0.81 $ 2.39 $ 1.38 Loss from discontinued operations, net of tax — — (0.01 ) — Net income $ 1.46 $ 0.81 $ 2.39 $ 1.38 Diluted earnings per common share Net income from continuing operations $ 1.46 $ 0.80 $ 2.38 $ 1.38 Loss from discontinued operations, net of tax — — (0.01 ) — Net income $ 1.46 $ 0.81 $ 2.37 $ 1.37 (a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers. (b) Includes shares related to share-based compensation that vested but were not yet issued .

Regulatory Capital and Other _2

Regulatory Capital and Other Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following table summarizes our capital ratios under the U.S. Basel III capital framework. June 30, 2019 December 31, 2018 Required minimum (a) Well-capitalized minimum ($ in millions) Amount Ratio Amount Ratio Capital ratios Common Equity Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 13,887 9.52 % $ 13,397 9.14 % 4.50 % (b) Ally Bank 16,739 12.54 16,552 12.61 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 16,319 11.19 % $ 15,831 10.80 % 6.00 % 6.00 % Ally Bank 16,739 12.54 16,552 12.61 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 18,572 12.73 % $ 18,046 12.31 % 8.00 % 10.00 % Ally Bank 17,947 13.44 17,620 13.42 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (c) Ally Financial Inc. $ 16,319 9.05 % $ 15,831 9.00 % 4.00 % (b) Ally Bank 16,739 10.26 16,552 10.69 4.00 5.00 % (a) In addition to the minimum risk-based capital requirements for the Common Equity Tier 1 capital, Tier 1 capital, and total capital ratios, Ally and Ally Bank were required to maintain a minimum capital conservation buffer of 2.5% and 1.875% at June 30, 2019 , and December 31, 2018 , respectively. (b) Currently, there is no ratio component for determining whether a BHC is “well-capitalized.” (c) Federal regulatory reporting guidelines require the calculation of adjusted quarterly average assets using a daily average methodology.
Schedule of Common Share Repurchase Activity	The following table presents information related to our common stock and distributions to our common stockholders over the last six quarters. Common stock repurchased during period (a) Number of common shares outstanding Cash dividends declared per common share (b) ($ in millions, except per share data; shares in thousands) Approximate dollar value Number of shares Beginning of period End of period 2018 First quarter $ 185 6,473 437,054 432,691 $ 0.13 Second quarter 195 7,280 432,691 425,752 0.13 Third quarter 250 9,194 425,752 416,591 0.15 Fourth quarter 309 12,121 416,591 404,900 0.15 2019 First quarter $ 211 8,113 404,900 399,761 $ 0.17 Second quarter 229 7,775 399,761 392,775 0.17 (a) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans. (b) On July 16, 2019 , the Ally Board of Directors (the Board) declared a quarterly cash dividend of $0.17 per share on all common stock, payable on August 15, 2019 . Refer to Note 24 for further information regarding this common stock dividend.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position	The following table summarizes the amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet . The amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Derivative contracts in a receivable and payable position exclude open trade equity on derivatives cleared through central clearing counterparties. Any associated collateral exchanged with our central clearing counterparties are treated as settlements of the derivative exposure, rather than collateral. Such payments are recognized as settlements of the derivatives contracts in a receivable and payable position on our Condensed Consolidated Balance Sheet . Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2019 December 31, 2018 Derivative contracts in a Notional amount Derivative contracts in a Notional amount ($ in millions) receivable position payable position receivable position payable position Derivatives designated as accounting hedges Interest rate contracts Swaps $ — $ — $ 16,986 $ — $ — $ 24,203 Purchased options 54 — 4,100 — — — Foreign exchange contracts Forwards — — 137 1 — 136 Total derivatives designated as accounting hedges 54 — 21,223 1 — 24,339 Derivatives not designated as accounting hedges Interest rate contracts Futures and forwards — — 17 — — 11 Written options 2 3 1,765 — 37 6,793 Purchased options 3 — 1,658 37 — 6,742 Total interest rate risk 5 3 3,440 37 37 13,546 Foreign exchange contracts Futures and forwards — — 126 3 — 181 Total foreign exchange risk — — 126 3 — 181 Equity contracts Written options — 1 — — — — Total equity risk — 1 — — — — Total derivatives not designated as accounting hedges 5 4 3,566 40 37 13,727 Total derivatives $ 59 $ 4 $ 24,789 $ 41 $ 37 $ 38,066
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The following table presents amounts recorded on our Condensed Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges. ($ in millions) Carrying amount of the hedged items Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items Total Discontinued (a) June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 June 30, 2019 December 31, 2018 Assets Available-for-sale securities (b) (c) $ 1,401 $ 1,485 $ 11 $ — $ 10 $ (5 ) Finance receivables and loans, net (d) 46,111 40,850 153 24 59 5 Liabilities Long-term debt $ 12,093 $ 13,001 $ 85 $ 67 $ 66 $ 67 (a) Represents the fair value hedging adjustment on qualifying hedges for which the hedging relationship was discontinued. This represents a subset of the amounts reported in the total hedging adjustment. (b) The carrying amount of hedged available-for-sale securities is presented above using amortized cost. Refer to Note 6 for a reconciliation of the amortized cost and fair value of available-for-sale securities. (c) Includes the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At December 31, 2018 , the amortized cost basis of the closed portfolios used in these hedging relationships was $47 million . There was no basis adjustment associated with the last-of-layer relationships, and the amount identified as the last of layer in these hedge relationships was $28 million at December 31, 2018 . A last-of-layer hedge strategy did not exist at June 30, 2019 . (d) The hedged item represents the carrying value of the hedged portfolio of assets. The amount identified as the last of layer in the open hedge relationship was $13.4 billion as of June 30, 2019 , and $21.4 billion as of December 31, 2018 . The basis adjustment associated with the open last-of-layer relationship was a $94 million asset as of June 30, 2019 , and a $19 million asset as of December 31, 2018 , which would be allocated across the entire remaining closed pool upon termination or maturity of the hedge relationship. The amount that is identified as the last of layer in the discontinued hedge relationship was $12.8 billion at June 30, 2019 . The basis adjustment associated with the discontinued last-of-layer relationship was a $57 million asset as of June 30, 2019 , which was allocated across the entire remaining pool upon termination of the hedge relationship.
Schedule of Derivative Instruments Not Designated as Accounting Hedge	The following table summarizes the location and amounts of gains and losses on derivative instruments not designated as accounting hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Gain (loss) recognized in earnings Interest rate contracts Gain on mortgage and automotive loans, net $ — $ — $ 1 $ — Other income, net of losses (2 ) (2 ) (7 ) — Total interest rate contracts (2 ) (2 ) (6 ) — Foreign exchange contracts Other income, net of losses (2 ) 6 (3 ) 6 Total foreign exchange contracts (2 ) 6 (3 ) 6 (Loss) gain recognized in earnings $ (4 ) $ 4 $ (9 ) $ 6
Schedule of Location and Amounts of Gains and Losses on Derivative Instruments	The following tables summarize the location and amounts of gains and losses on derivative instruments designated as fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ (19 ) $ 8 Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — 19 (8 ) Hedged fixed-rate FHLB advances — — — — — 10 Derivatives designated as hedging instruments on fixed-rate FHLB advances — — — — — (10 ) Hedged available-for-sale securities — — 2 (2 ) — — Derivatives designated as hedging instruments on available-for-sale securities — — (2 ) 2 — — Hedged fixed-rate consumer automotive loans 98 (6 ) — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans (98 ) 6 — — — — Total gain on fair value hedging relationships — — — — — — Gain on cash flow hedging relationships Interest rate contracts Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — 4 — Total gain on cash flow hedging relationships $ — $ — $ — $ — $ 4 $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 1,860 $ 1,647 $ 244 $ 188 $ 407 $ 434 Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on deposits Interest on long-term debt Six months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 2019 2018 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ (19 ) $ 44 Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — 19 (43 ) Hedged fixed-rate FHLB advances — — — — — — — 43 Derivatives designated as hedging instruments on fixed-rate FHLB advances — — — — — — — (43 ) Hedged available-for-sale securities — — 12 (5 ) — — — — Derivatives designated as hedging instruments on available-for-sale securities — — (12 ) 5 — — — — Hedged fixed-rate consumer automotive loans 141 (51 ) — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans (141 ) 51 — — — — — — Total gain on fair value hedging relationships — — — — — — — 1 Gain on cash flow hedging relationships Interest rate contracts Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — 1 — — — Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — — — 8 — Total gain on cash flow hedging relationships $ — $ — $ — $ — $ 1 $ — $ 8 $ — Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 3,667 $ 3,190 $ 484 $ 364 $ 1,243 $ 750 $ 826 $ 845
Schedule of Derivative Instruments	The following tables summarize the location and amounts of gains and losses related to interest and amortization on derivative instruments designated as fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 6 $ 14 Interest for qualifying accounting hedges of unsecured debt — — — — — 1 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (5 ) (5 ) Interest for qualifying accounting hedges of secured debt (FHLB advances) — — — — — 2 Amortization of deferred basis adjustments of available-for-sale securities — — (1 ) — — — Amortization of deferred loan basis adjustments (9 ) (4 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment 11 5 — — — — Total gain (loss) on fair value hedging relationships 2 1 (1 ) — 1 12 Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate borrowings — — — — — 2 Total gain on cash flow hedging relationships $ — $ — $ — $ — $ — $ 2 Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Six months ended June 30, ($ in millions) 2019 2018 2019 2018 2019 2018 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 12 $ 29 Interest for qualifying accounting hedges of unsecured debt — — — — — 4 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (11 ) (6 ) Interest for qualifying accounting hedges of secured debt (FHLB advances) — — — — — 4 Amortization of deferred basis adjustments of available-for-sale securities — — (1 ) — — — Interest for qualifying accounting hedges of available-for-sale securities — — — (1 ) — — Amortization of deferred loan basis adjustments (13 ) (8 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment 17 (2 ) — — — — Total gain (loss) on fair value hedging relationships 4 (10 ) (1 ) (1 ) 1 31 Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate borrowings — — — — — 3 Total gain on cash flow hedging relationships $ — $ — $ — $ — $ 1 $ 3
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table summarizes the effect of cash flow hedges on accumulated other comprehensive income (loss). Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Interest rate contracts Gain recognized in other comprehensive income (loss) $ 22 $ 5 $ 12 $ 23
Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss)	The following table summarizes the effect of net investment hedges on accumulated other comprehensive income (loss) and the Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2019 2018 2019 2018 Foreign exchange contracts (a) (b) (Loss) gain recognized in other comprehensive income (loss) $ (3 ) $ 3 $ (5 ) $ 7 (a) There were no amounts excluded from effectiveness testing for the three months and six months ended June 30, 2019 , or 2018 . (b) Gains and losses reclassified from accumulated other comprehensive income (loss) are reported as other income, net of losses, in the Condensed Consolidated Statement of Comprehensive Income. There were no amounts reclassified for the three months and six months ended June 30, 2019 , or 2018 .

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on a Recurring Basis	The following tables display the assets and liabilities measured at fair value on a recurring basis including financial instruments elected for the fair value option. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The tables below display the hedges separately from the hedged items; therefore, they do not directly display the impact of our risk-management activities. Recurring fair value measurements June 30, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 582 $ — $ 9 $ 591 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 2,017 1 — 2,018 U.S. States and political subdivisions — 598 — 598 Foreign government 13 136 — 149 Agency mortgage-backed residential — 19,100 — 19,100 Mortgage-backed residential — 2,934 — 2,934 Agency mortgage-backed commercial — 1,351 — 1,351 Mortgage-backed commercial — 713 — 713 Asset-backed — 477 — 477 Corporate debt — 1,348 — 1,348 Total available-for-sale securities 2,030 26,658 — 28,688 Mortgage loans held-for-sale (b) — — 22 22 Interests retained in financial asset sales — — 3 3 Derivative contracts in a receivable position Interest rate — 57 2 59 Total derivative contracts in a receivable position — 57 2 59 Total assets $ 2,612 $ 26,715 $ 36 $ 29,363 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Interest rate $ — $ 3 $ — $ 3 Other 1 — — 1 Total derivative contracts in a payable position 1 3 — 4 Total liabilities $ 1 $ 3 $ — $ 4 (a) Our investment in any one industry did not exceed 14% . (b) Carried at fair value due to fair value option elections. Recurring fair value measurements December 31, 2018 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 766 $ — $ 7 $ 773 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 1,850 1 — 1,851 U.S. States and political subdivisions — 802 — 802 Foreign government 7 138 — 145 Agency mortgage-backed residential — 17,138 — 17,138 Mortgage-backed residential — 2,686 — 2,686 Agency mortgage-backed commercial — 3 — 3 Mortgage-backed commercial — 714 — 714 Asset-backed — 723 — 723 Corporate debt — 1,241 — 1,241 Total available-for-sale securities 1,857 23,446 — 25,303 Mortgage loans held-for-sale (b) — — 8 8 Interests retained in financial asset sales — — 4 4 Derivative contracts in a receivable position Interest rate — 37 — 37 Foreign currency — 4 — 4 Total derivative contracts in a receivable position — 41 — 41 Total assets $ 2,623 $ 23,487 $ 19 $ 26,129 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Interest rate $ — $ 37 $ — $ 37 Total derivative contracts in a payable position — 37 — 37 Total liabilities $ — $ 37 $ — $ 37 (a) Our investment in any one industry did not exceed 9% . (b) Carried at fair value due to fair value option elections.
Fair Value, Assets Measured on a Recurring Basis, Unobservable Input Reconciliation	The following tables present the reconciliation for all Level 3 assets and liabilities measured at fair value on a recurring basis. There were no transfers into or out of Level 3 in the periods presented. We often economically hedge the fair value change of our assets or liabilities with derivatives and other financial instruments. The Level 3 items presented below may be hedged by derivatives and other financial instruments that are classified as Level 1 or Level 2. Thus, the following tables do not fully reflect the impact of our risk-management activities. Level 3 recurring fair value measurements Net realized/unrealized gains Fair value at June 30, 2019 Net unrealized gains still held at June 30, 2019 ($ in millions) Fair value at April 1, 2019 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Equity securities $ 11 $ 2 (a) $ — $ — $ — $ — $ (4 ) $ 9 $ 2 $ — Mortgage loans held-for-sale (b) 15 3 (c) — 156 (152 ) — — 22 — — Other assets Interests retained in financial asset sales 4 — — — — — (1 ) 3 — — Derivative assets 2 — (c) — — — — — 2 — — Total assets $ 32 $ 5 $ — $ 156 $ (152 ) $ — $ (5 ) $ 36 $ 2 $ — (a) Reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income . (b) Carried at fair value due to fair value option elections. (c) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Level 3 recurring fair value measurements Fair value at April 1, 2018 Net realized/unrealized gains Purchases Sales Issuances Settlements Fair value at June 30, 2018 Net unrealized gains included in earnings still held at June 30, 2018 ($ in millions) included in earnings included in OCI Assets Equity securities $ 12 $ — $ — $ — $ — $ — $ — $ 12 $ — Mortgage loans held-for-sale (a) 7 1 (b) — 73 (68 ) — — 13 — Other assets Interests retained in financial asset sales 5 — — — — — (1 ) 4 — Derivative assets 1 — — — — — — 1 — Total assets $ 25 $ 1 $ — $ 73 $ (68 ) $ — $ (1 ) $ 30 $ — (a) Carried at fair value due to fair value option elections. (b) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Level 3 recurring fair value measurements Net realized/unrealized gains Fair value at June 30, 2019 Net unrealized gains still held at June 30, 2019 ($ in millions) Fair value at Jan. 1, 2019 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Equity securities $ 7 $ 6 (a) $ — $ — $ — $ — $ (4 ) $ 9 $ 6 $ — Mortgage loans held-for-sale (b) 8 4 (c) — 246 (236 ) — — 22 — — Other assets Interests retained in financial asset sales 4 — — — — — (1 ) 3 — — Derivative assets — 2 (c) — — — — — 2 2 — Total assets $ 19 $ 12 $ — $ 246 $ (236 ) $ — $ (5 ) $ 36 $ 8 $ — (a) Reported as other gain on investments, net, in the Condensed Consolidated Statement of Comprehensive Income . (b) Carried at fair value due to fair value option elections. (c) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income . Level 3 recurring fair value measurements Fair value at Jan. 1, 2018 Net realized/unrealized (losses) gains Purchases Sales Issuances Settlements Fair value at June 30, 2018 Net unrealized losses included in earnings still held at June 30, 2018 ($ in millions) included in earnings included in OCI Assets Equity securities $ 19 $ (4 ) (a) $ — $ — $ — $ — $ (3 ) $ 12 $ (5 ) Mortgage loans held-for-sale (b) 13 2 (c) — 132 (134 ) — — 13 — Other assets Interests retained in financial asset sales 5 — — — — — (1 ) 4 — Derivative assets 1 — — — — — — 1 — Total assets $ 38 $ (2 ) $ — $ 132 $ (134 ) $ — $ (4 ) $ 30 $ (5 ) (a) Reported as other loss on investments, net, in the Condensed Consolidated Statement of Comprehensive Income . (b) Carried at fair value due to fair value option elections. (c) Reported as gain on mortgage and automotive loans, net, in the Condensed Consolidated Statement of Comprehensive Income .
Fair Value Measurements - Nonrecurring Basis	The following tables display assets and liabilities measured at fair value on a nonrecurring basis and still held at June 30, 2019 , and December 31, 2018 , respectively. The amounts are as of the end of each period presented, which approximate the fair value measurements that occurred during each period. Nonrecurring fair value measurements Lower-of-cost or fair value reserve, valuation reserve, or cumulative impairment Total gain (loss) included in earnings June 30, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 253 $ 253 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 54 54 (19 ) n/m (a) Other — — 17 17 (30 ) n/m (a) Total commercial finance receivables and loans, net — — 71 71 (49 ) n/m (a) Other assets Repossessed and foreclosed assets (c) — — 13 13 (1 ) n/m (a) Nonmarketable equity investments — — 9 9 (1 ) n/m (a) Equity-method investments — — 3 3 (4 ) n/m (a) Total assets $ — $ — $ 349 $ 349 $ (55 ) n/m n/m = not meaningful (a) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation allowance, loan loss allowance, or cumulative impairment. (b) Represents the portion of the portfolio specifically impaired during 2019 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring fair value measurements Lower-of-cost or fair value reserve, valuation reserve, or cumulative impairment Total gain (loss) included in earnings December 31, 2018 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net Automotive (a) $ — $ — $ 210 $ 210 $ (2 ) n/m (b) Other — — 96 96 — n/m (b) Total loans held-for-sale, net — — 306 306 (2 ) n/m (b) Commercial finance receivables and loans, net (c) Automotive — — 84 84 (10 ) n/m (b) Other — — 55 55 (46 ) n/m (b) Total commercial finance receivables and loans, net — — 139 139 (56 ) n/m (b) Other assets Nonmarketable equity investments — — 1 1 (1 ) n/m (b) Equity-method investments — — 3 3 — n/m (b) Repossessed and foreclosed assets (d) — — 13 13 (1 ) n/m (b) Total assets $ — $ — $ 462 $ 462 $ (60 ) n/m n/m = not meaningful (a) Represents loans within our commercial automotive portfolio. Of this amount, $104 million was valued based upon a sales price for a transaction that closed in January 2019, and $106 million was valued using a discounted cash flow analysis, with a spread over forward interest rates as a significant unobservable input utilizing a range of 0.08 – 1.09% and weighted average of 0.72% . (b) We consider the applicable valuation allowance, loan loss allowance, or cumulative impairment to be the most relevant indicator of the impact on earnings caused by the fair value measurement. Accordingly, the table above excludes total gains and losses included in earnings for these items. The carrying values are inclusive of the respective valuation allowance, loan loss allowance, or cumulative impairment. (c) Represents the portion of the portfolio specifically impaired during 2018 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value.
Financial Instruments Disclosure	The following table presents the carrying and estimated fair value of financial instruments, except for those recorded at fair value on a recurring basis presented in the previous section of this note titled Recurring Fair Value. When possible, we use quoted market prices to determine fair value. Where quoted market prices are not available, the fair value is internally derived based on appropriate valuation methodologies with respect to the amount and timing of future cash flows and estimated discount rates. However, considerable judgment is required in interpreting current market data to develop the market assumptions and inputs necessary to estimate fair value. As such, the actual amount received to sell an asset or the amount paid to settle a liability could differ from our estimates. Fair value information presented herein was based on information available at June 30, 2019 , and December 31, 2018 . Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2019 Financial assets Held-to-maturity securities $ 2,461 $ — $ 2,499 $ — $ 2,499 Loans held-for-sale, net 253 — — 253 253 Finance receivables and loans, net 127,928 — — 131,383 131,383 FHLB/FRB stock (a) 1,226 — 1,226 — 1,226 Financial liabilities Deposit liabilities $ 56,084 $ — $ — $ 56,575 $ 56,575 Short-term borrowings 6,519 — — 6,523 6,523 Long-term debt 37,466 — 23,441 16,734 40,175 December 31, 2018 Financial assets Held-to-maturity securities $ 2,362 $ — $ 2,307 $ — $ 2,307 Loans held-for-sale, net 306 — — 306 306 Finance receivables and loans, net 128,684 — — 130,878 130,878 FHLB/FRB stock (a) 1,351 — 1,351 — 1,351 Financial liabilities Deposit liabilities $ 51,985 $ — $ — $ 51,997 $ 51,997 Short-term borrowings 9,987 — — 9,992 9,992 Long-term debt 44,193 — 23,846 21,800 45,646 (a) Included in other assets on our Condensed Consolidated Balance Sheet .

Offsetting Assets and Liabili_2

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Offsetting [Abstract]
Offsetting Assets	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet June 30, 2019 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions (d) $ 57 $ — $ 57 $ (2 ) $ (54 ) $ 1 Derivative assets with no offsetting arrangements 2 — 2 — — 2 Total assets $ 59 $ — $ 59 $ (2 ) $ (54 ) $ 3 Liabilities Derivative liabilities in net liability positions (d) $ 2 $ — $ 2 $ — $ (1 ) $ 1 Derivative liabilities in net asset positions 2 — 2 (2 ) — — Total derivative liabilities (d) 4 — 4 (2 ) (1 ) 1 Securities sold under agreements to repurchase (e) 432 — 432 — (432 ) — Total liabilities $ 436 $ — $ 436 $ (2 ) $ (433 ) $ 1 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. There was $32 million of noncash derivative collateral, and $1 million of noncash collateral associated with our repurchase agreements, pledged to us that was excluded at June 30, 2019 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $33 million at June 30, 2019 . We have not sold or pledged any of the noncash collateral received under these agreements as of June 30, 2019 . (d) For additional information on derivative instruments and hedging activities, refer to Note 17 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 12 . Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet December 31, 2018 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions $ 41 $ — $ 41 $ — $ (4 ) $ 37 Total assets (d) $ 41 $ — $ 41 $ — $ (4 ) $ 37 Liabilities Derivative liabilities in net liability positions (d) $ 37 $ — $ 37 $ — $ — $ 37 Securities sold under agreements to repurchase (e) 685 — 685 — (685 ) — Total liabilities $ 722 $ — $ 722 $ — $ (685 ) $ 37 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. There was $3 million of noncash derivative collateral, and $4 million of noncash collateral associated with our repurchase agreements, pledged to us that was excluded at December 31, 2018 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $7 million at December 31, 2018 . We have not sold or pledged any of the noncash collateral received under these agreements as of December 31, 2018 . (d) For additional information on derivative instruments and hedging activities, refer to Note 17 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 12 .
Offsetting Liabilities	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet June 30, 2019 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions (d) $ 57 $ — $ 57 $ (2 ) $ (54 ) $ 1 Derivative assets with no offsetting arrangements 2 — 2 — — 2 Total assets $ 59 $ — $ 59 $ (2 ) $ (54 ) $ 3 Liabilities Derivative liabilities in net liability positions (d) $ 2 $ — $ 2 $ — $ (1 ) $ 1 Derivative liabilities in net asset positions 2 — 2 (2 ) — — Total derivative liabilities (d) 4 — 4 (2 ) (1 ) 1 Securities sold under agreements to repurchase (e) 432 — 432 — (432 ) — Total liabilities $ 436 $ — $ 436 $ (2 ) $ (433 ) $ 1 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. There was $32 million of noncash derivative collateral, and $1 million of noncash collateral associated with our repurchase agreements, pledged to us that was excluded at June 30, 2019 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $33 million at June 30, 2019 . We have not sold or pledged any of the noncash collateral received under these agreements as of June 30, 2019 . (d) For additional information on derivative instruments and hedging activities, refer to Note 17 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 12 . Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet December 31, 2018 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount Assets Derivative assets in net asset positions $ 41 $ — $ 41 $ — $ (4 ) $ 37 Total assets (d) $ 41 $ — $ 41 $ — $ (4 ) $ 37 Liabilities Derivative liabilities in net liability positions (d) $ 37 $ — $ 37 $ — $ — $ 37 Securities sold under agreements to repurchase (e) 685 — 685 — (685 ) — Total liabilities $ 722 $ — $ 722 $ — $ (685 ) $ 37 (a) Financial collateral received/pledged shown as a balance based on the sum of all net asset and liability positions between Ally and each individual derivative counterparty. (b) Amounts disclosed are limited to the financial asset or liability balance and, accordingly, exclude excess collateral received or pledged and noncash collateral received. There was $3 million of noncash derivative collateral, and $4 million of noncash collateral associated with our repurchase agreements, pledged to us that was excluded at December 31, 2018 . We do not record such collateral received on our Condensed Consolidated Balance Sheet unless certain conditions are met. (c) Certain agreements grant us the right to sell or pledge the noncash assets we receive as collateral. Noncash collateral pledged to us where the agreement grants us the right to sell or pledge the underlying assets had a fair value of $7 million at December 31, 2018 . We have not sold or pledged any of the noncash collateral received under these agreements as of December 31, 2018 . (d) For additional information on derivative instruments and hedging activities, refer to Note 17 . (e) For additional information on securities sold under agreements to repurchase, refer to Note 12 .

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Financial information for our reportable operating segments is summarized as follows. Three months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2019 Net financing revenue and other interest income $ 1,022 $ 15 $ 46 $ 61 $ 13 $ 1,157 Other revenue 61 286 4 10 34 395 Total net revenue 1,083 301 50 71 47 1,552 Provision for loan losses 180 — — 3 (6 ) 177 Total noninterest expense 444 301 36 22 78 881 Income (loss) from continuing operations before income tax expense $ 459 $ — $ 14 $ 46 $ (25 ) $ 494 Total assets $ 114,955 $ 8,241 $ 16,584 $ 4,980 $ 35,688 $ 180,448 2018 Net financing revenue and other interest income $ 925 $ 13 $ 44 $ 57 $ 55 $ 1,094 Other revenue 63 266 2 14 19 364 Total net revenue 988 279 46 71 74 1,458 Provision for loan losses 170 — — (6 ) (6 ) 158 Total noninterest expense 436 268 32 19 84 839 Income (loss) from continuing operations before income tax expense $ 382 $ 11 $ 14 $ 58 $ (4 ) $ 461 Total assets $ 114,915 $ 7,634 $ 13,385 $ 4,458 $ 30,953 $ 171,345 (a) Net financing revenue and other interest income after the provision for loan losses totaled $980 million and $936 million for the three months ended June 30, 2019 , and 2018 , respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2019 Net financing revenue and other interest income $ 2,002 $ 27 $ 96 $ 115 $ 49 $ 2,289 Other revenue 129 646 6 21 59 861 Total net revenue 2,131 673 102 136 108 3,150 Provision for loan losses 442 — 2 26 (11 ) 459 Total noninterest expense 901 528 73 51 158 1,711 Income (loss) from continuing operations before income tax expense $ 788 $ 145 $ 27 $ 59 $ (39 ) $ 980 Total assets $ 114,955 $ 8,241 $ 16,584 $ 4,980 $ 35,688 $ 180,448 2018 Net financing revenue and other interest income $ 1,834 $ 25 $ 87 $ 103 $ 94 $ 2,143 Other revenue 129 512 3 22 52 718 Total net revenue 1,963 537 90 125 146 2,861 Provision for loan losses 429 — 2 (6 ) (6 ) 419 Total noninterest expense 884 499 66 44 160 1,653 Income (loss) from continuing operations before income tax expense $ 650 $ 38 $ 22 $ 87 $ (8 ) $ 789 Total assets $ 114,915 $ 7,634 $ 13,385 $ 4,458 $ 30,953 $ 171,345 (a) Net financing revenue and other interest income after the provision for loan losses totaled $1.8 billion and $1.7 billion for the six months ended June 30, 2019 , and 2018 , respectively.

Parent and Guarantor Condense_2

Parent and Guarantor Condensed Consolidating Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Income Statement	Condensed Consolidating Statements of Comprehensive Income Three months ended June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (60 ) $ — $ 1,923 $ (3 ) $ 1,860 Interest and fees on finance receivables and loans — intercompany 3 — 1 (4 ) — Interest on loans held-for-sale — — 3 — 3 Interest and dividends on investment securities and other earning assets — — 244 — 244 Interest on cash and cash equivalents 4 — 17 — 21 Interest-bearing cash — intercompany 3 — 5 (8 ) — Operating leases (1 ) — 364 — 363 Total financing (loss) revenue and other interest income (51 ) — 2,557 (15 ) 2,491 Interest expense Interest on deposits — — 651 — 651 Interest on short-term borrowings 13 — 24 — 37 Interest on long-term debt 212 — 195 — 407 Interest on intercompany debt 6 — 6 (12 ) — Total interest expense 231 — 876 (12 ) 1,095 Net depreciation expense on operating lease assets 1 — 238 — 239 Net financing (loss) revenue (283 ) — 1,443 (3 ) 1,157 Cash dividends from subsidiaries Bank subsidiary 500 500 — (1,000 ) — Nonbank subsidiaries 94 — — (94 ) — Other revenue Insurance premiums and service revenue earned — — 261 — 261 (Loss) gain on mortgage and automotive loans, net (1 ) — 3 — 2 Other gain on investments, net — — 39 — 39 Other income, net of losses 91 — 145 (143 ) 93 Total other revenue 90 — 448 (143 ) 395 Total net revenue 401 500 1,891 (1,240 ) 1,552 Provision for loan losses 5 — 173 (1 ) 177 Noninterest expense Compensation and benefits expense 9 — 287 — 296 Insurance losses and loss adjustment expenses — — 127 — 127 Other operating expenses 159 — 442 (143 ) 458 Total noninterest expense 168 — 856 (143 ) 881 Income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries 228 500 862 (1,096 ) 494 Income tax (benefit) expense from continuing operations (289 ) — 199 — (90 ) Net income from continuing operations 517 500 663 (1,096 ) 584 Loss from discontinued operations, net of tax (2 ) — — — (2 ) Undistributed income (loss) of subsidiaries Bank subsidiary 110 110 — (220 ) — Nonbank subsidiaries (43 ) — — 43 — Net income 582 610 663 (1,273 ) 582 Other comprehensive income, net of tax 309 237 311 (548 ) 309 Comprehensive income $ 891 $ 847 $ 974 $ (1,821 ) $ 891 Three months ended June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (1 ) $ — $ 1,648 $ — $ 1,647 Interest and fees on finance receivables and loans — intercompany 4 — 1 (5 ) — Interest on loans held-for-sale — — 6 — 6 Interest and dividends on investment securities and other earning assets — — 188 — 188 Interest on cash and cash equivalents 2 — 14 1 17 Interest-bearing cash — intercompany 2 — 2 (4 ) — Operating leases 1 — 373 — 374 Total financing revenue and other interest income 8 — 2,232 (8 ) 2,232 Interest expense Interest on deposits — — 395 4 399 Interest on short-term borrowings 10 — 30 — 40 Interest on long-term debt 257 — 177 — 434 Interest on intercompany debt 4 — 8 (12 ) — Total interest expense 271 — 610 (8 ) 873 Net depreciation expense on operating lease assets 1 — 264 — 265 Net financing (loss) revenue (264 ) — 1,358 — 1,094 Cash dividends from subsidiaries Bank subsidiary 500 500 — (1,000 ) — Nonbank subsidiaries 132 — — (132 ) — Other revenue Insurance premiums and service revenue earned — — 239 — 239 Gain on mortgage and automotive loans, net — — 1 — 1 Other gain on investments, net — — 27 — 27 Other income, net of losses 100 — 185 (188 ) 97 Total other revenue 100 — 452 (188 ) 364 Total net revenue 468 500 1,810 (1,320 ) 1,458 Provision for loan losses 32 — 126 — 158 Noninterest expense Compensation and benefits expense 25 — 267 — 292 Insurance losses and loss adjustment expenses — — 101 — 101 Other operating expenses 173 — 461 (188 ) 446 Total noninterest expense 198 — 829 (188 ) 839 Income from continuing operations before income tax (benefit) expense and undistributed income (loss) of subsidiaries 238 500 855 (1,132 ) 461 Income tax (benefit) expense from continuing operations (66 ) — 179 — 113 Net income from continuing operations 304 500 676 (1,132 ) 348 (Loss) income from discontinued operations, net of tax (1 ) — 2 — 1 Undistributed income (loss) of subsidiaries Bank subsidiary 52 52 — (104 ) — Nonbank subsidiaries (6 ) — — 6 — Net income 349 552 678 (1,230 ) 349 Other comprehensive loss, net of tax (70 ) (56 ) (74 ) 130 (70 ) Comprehensive income $ 279 $ 496 $ 604 $ (1,100 ) $ 279 Six months ended June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ (120 ) $ — $ 3,790 $ (3 ) $ 3,667 Interest and fees on finance receivables and loans — intercompany 6 — 3 (9 ) — Interest on loans held-for-sale — — 5 — 5 Interest and dividends on investment securities and other earning assets — — 484 — 484 Interest on cash and cash equivalents 6 — 38 — 44 Interest-bearing cash — intercompany 5 — 8 (13 ) — Operating leases 1 — 723 — 724 Total financing (loss) revenue and other interest income (102 ) — 5,051 (25 ) 4,924 Interest expense Interest on deposits — — 1,243 — 1,243 Interest on short-term borrowings 26 — 55 — 81 Interest on long-term debt 423 — 403 — 826 Interest on intercompany debt 11 — 11 (22 ) — Total interest expense 460 — 1,712 (22 ) 2,150 Net depreciation expense on operating lease assets 2 — 483 — 485 Net financing (loss) revenue (564 ) — 2,856 (3 ) 2,289 Cash dividends from subsidiaries Bank subsidiary 900 900 — (1,800 ) — Nonbank subsidiaries 136 — — (136 ) — Other revenue Insurance premiums and service revenue earned — — 522 — 522 Gain on mortgage and automotive loans, net 3 — 9 — 12 Other gain on investments, net — — 147 — 147 Other income, net of losses 194 — 289 (303 ) 180 Total other revenue 197 — 967 (303 ) 861 Total net revenue 669 900 3,823 (2,242 ) 3,150 Provision for loan losses 32 — 445 (18 ) 459 Noninterest expense Compensation and benefits expense 21 — 593 — 614 Insurance losses and loss adjustment expenses — — 186 — 186 Other operating expenses 314 — 900 (303 ) 911 Total noninterest expense 335 — 1,679 (303 ) 1,711 Income from continuing operations before income tax (benefit) expense and undistributed income of subsidiaries 302 900 1,699 (1,921 ) 980 Income tax (benefit) expense from continuing operations (350 ) — 371 — 21 Net income from continuing operations 652 900 1,328 (1,921 ) 959 Loss from discontinued operations, net of tax (3 ) — — — (3 ) Undistributed income of subsidiaries Bank subsidiary 167 167 — (334 ) — Nonbank subsidiaries 140 — — (140 ) — Net income 956 1,067 1,328 (2,395 ) 956 Other comprehensive income, net of tax 615 466 631 (1,097 ) 615 Comprehensive income $ 1,571 $ 1,533 $ 1,959 $ (3,492 ) $ 1,571 Six months ended June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Financing revenue and other interest income Interest and fees on finance receivables and loans $ 10 $ — $ 3,180 $ — $ 3,190 Interest and fees on finance receivables and loans — intercompany 6 — 2 (8 ) — Interest on loans held-for-sale — — 6 — 6 Interest and dividends on investment securities and other earning assets — — 365 (1 ) 364 Interest on cash and cash equivalents 4 — 28 — 32 Interest-bearing cash — intercompany 4 — 4 (8 ) — Operating leases 3 — 753 — 756 Total financing revenue and other interest income 27 — 4,338 (17 ) 4,348 Interest expense Interest on deposits — — 750 — 750 Interest on short-term borrowings 20 — 52 — 72 Interest on long-term debt 515 — 330 — 845 Interest on intercompany debt 7 — 10 (17 ) — Total interest expense 542 — 1,142 (17 ) 1,667 Net depreciation expense on operating lease assets 5 — 533 — 538 Net financing (loss) revenue (520 ) — 2,663 — 2,143 Cash dividends from subsidiaries Bank subsidiary 1,500 1,500 — (3,000 ) — Nonbank subsidiaries 301 — — (301 ) — Other revenue Insurance premiums and service revenue earned — — 495 — 495 Gain on mortgage and automotive loans, net 28 — 2 (28 ) 2 Other gain on investments, net — — 15 — 15 Other income, net of losses 196 — 406 (396 ) 206 Total other revenue 224 — 918 (424 ) 718 Total net revenue 1,505 1,500 3,581 (3,725 ) 2,861 Provision for loan losses 113 — 334 (28 ) 419 Noninterest expense Compensation and benefits expense 48 — 550 — 598 Insurance losses and loss adjustment expenses — — 164 — 164 Other operating expenses 355 — 932 (396 ) 891 Total noninterest expense 403 — 1,646 (396 ) 1,653 Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries 989 1,500 1,601 (3,301 ) 789 Income tax (benefit) expense from continuing operations (122 ) — 311 — 189 Net income from continuing operations 1,111 1,500 1,290 (3,301 ) 600 (Loss) income from discontinued operations, net of tax (2 ) — 1 — (1 ) Undistributed (loss) income of subsidiaries Bank subsidiary (545 ) (545 ) — 1,090 — Nonbank subsidiaries 35 — — (35 ) — Net income 599 955 1,291 (2,246 ) 599 Other comprehensive loss, net of tax (398 ) (332 ) (413 ) 745 (398 ) Comprehensive income $ 201 $ 623 $ 878 $ (1,501 ) $ 201
Condensed Balance Sheet	Condensed Consolidating Balance Sheet June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 44 $ — $ 615 $ — $ 659 Interest-bearing 6 — 2,898 — 2,904 Interest-bearing — intercompany 1,242 — 745 (1,987 ) — Total cash and cash equivalents 1,292 — 4,258 (1,987 ) 3,563 Equity securities — — 591 — 591 Available-for-sale securities — — 28,688 — 28,688 Held-to-maturity securities — — 2,475 (14 ) 2,461 Loans held-for-sale, net — — 275 — 275 Finance receivables and loans, net Finance receivables and loans, net 2,292 — 126,904 14 129,210 Intercompany loans to Nonbank subsidiaries 663 — 102 (765 ) — Allowance for loan losses (34 ) — (1,248 ) — (1,282 ) Total finance receivables and loans, net 2,921 — 125,758 (751 ) 127,928 Investment in operating leases, net 2 — 8,405 — 8,407 Intercompany receivables from Bank subsidiary 105 — — (105 ) — Nonbank subsidiaries 40 — 115 (155 ) — Investment in subsidiaries Bank subsidiary 16,865 16,865 — (33,730 ) — Nonbank subsidiaries 7,096 — — (7,096 ) — Premiums receivable and other insurance assets — — 2,460 — 2,460 Other assets 2,339 — 5,475 (1,739 ) 6,075 Total assets $ 30,660 $ 16,865 $ 178,500 $ (45,577 ) $ 180,448 Liabilities and equity Deposit liabilities Noninterest-bearing $ — $ — $ 162 $ — $ 162 Interest-bearing 1 — 116,162 — 116,163 Interest-bearing — intercompany — — 1,242 (1,242 ) — Total deposit liabilities 1 — 117,566 (1,242 ) 116,325 Short-term borrowings 2,462 — 4,057 — 6,519 Long-term debt 12,447 — 25,019 — 37,466 Intercompany debt to Bank subsidiary 14 — — (14 ) — Nonbank subsidiaries 847 — 663 (1,510 ) — Intercompany payables to Bank subsidiary 51 — — (51 ) — Nonbank subsidiaries 108 — 107 (215 ) — Interest payable 150 — 594 — 744 Unearned insurance premiums and service revenue — — 3,171 — 3,171 Accrued expenses and other liabilities 264 — 3,377 (1,734 ) 1,907 Total liabilities 16,344 — 154,554 (4,766 ) 166,132 Total equity 14,316 16,865 23,946 (40,811 ) 14,316 Total liabilities and equity $ 30,660 $ 16,865 $ 178,500 $ (45,577 ) $ 180,448 December 31, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Assets Cash and cash equivalents Noninterest-bearing $ 55 $ — $ 755 $ — $ 810 Interest-bearing 5 — 3,722 — 3,727 Interest-bearing — intercompany 1,249 — 521 (1,770 ) — Total cash and cash equivalents 1,309 — 4,998 (1,770 ) 4,537 Equity securities — — 773 — 773 Available-for-sale securities — — 25,303 — 25,303 Held-to-maturity securities — — 2,382 (20 ) 2,362 Loans held-for-sale, net — — 314 — 314 Finance receivables and loans, net Finance receivables and loans, net 2,349 — 127,577 — 129,926 Intercompany loans to Nonbank subsidiaries 882 — 397 (1,279 ) — Allowance for loan losses (55 ) — (1,187 ) — (1,242 ) Total finance receivables and loans, net 3,176 — 126,787 (1,279 ) 128,684 Investment in operating leases, net 5 — 8,412 — 8,417 Intercompany receivables from Bank subsidiary 158 — — (158 ) — Nonbank subsidiaries 45 — 129 (174 ) — Investment in subsidiaries Bank subsidiary 16,213 16,213 — (32,426 ) — Nonbank subsidiaries 6,928 — — (6,928 ) — Premiums receivable and other insurance assets — — 2,326 — 2,326 Other assets 2,226 — 5,453 (1,526 ) 6,153 Total assets $ 30,060 $ 16,213 $ 176,877 $ (44,281 ) $ 178,869 Liabilities and equity Deposit liabilities Noninterest-bearing $ — $ — $ 142 $ — $ 142 Interest-bearing 1 — 106,035 — 106,036 Interest-bearing — intercompany — — 1,249 (1,249 ) — Total deposit liabilities 1 — 107,426 (1,249 ) 106,178 Short-term borrowings 2,477 — 7,510 — 9,987 Long-term debt 12,774 — 31,419 — 44,193 Intercompany debt to Bank subsidiary 20 — — (20 ) — Nonbank subsidiaries 918 — 882 (1,800 ) — Intercompany payables to Bank subsidiary 45 — — (45 ) — Nonbank subsidiaries 124 — 129 (253 ) — Interest payable 159 — 364 — 523 Unearned insurance premiums and service revenue — — 3,044 — 3,044 Accrued expenses and other liabilities 274 — 2,962 (1,560 ) 1,676 Total liabilities 16,792 — 153,736 (4,927 ) 165,601 Total equity 13,268 16,213 23,141 (39,354 ) 13,268 Total liabilities and equity $ 30,060 $ 16,213 $ 176,877 $ (44,281 ) $ 178,869
Condensed Cash Flow Statement	Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash provided by operating activities $ 693 $ 900 $ 2,189 $ (1,938 ) $ 1,844 Investing activities Purchases of equity securities — — (210 ) — (210 ) Proceeds from sales of equity securities — — 511 — 511 Purchases of available-for-sale securities — — (7,018 ) — (7,018 ) Proceeds from sales of available-for-sale securities — — 2,568 — 2,568 Proceeds from repayments of available-for-sale securities — — 1,805 — 1,805 Purchases of held-to-maturity securities — — (268 ) — (268 ) Proceeds from repayments of held-to-maturity securities — — 107 — 107 Net change in investment securities — intercompany — — 6 (6 ) — Purchases of finance receivables and loans held-for-investment — — (2,850 ) 464 (2,386 ) Proceeds from sales of finance receivables and loans initially held-for-investment 476 — 147 (464 ) 159 Originations and repayments of finance receivables and loans held-for-investment and other, net (407 ) — 3,173 3 2,769 Net change in loans — intercompany 216 — 291 (507 ) — Purchases of operating lease assets — — (1,769 ) — (1,769 ) Disposals of operating lease assets 2 — 1,319 — 1,321 Capital contributions to subsidiaries (1 ) — — 1 — Returns of contributed capital 26 — — (26 ) — Net change in nonmarketable equity investments (11 ) — 124 — 113 Other, net — — (208 ) (1 ) (209 ) Net cash provided by (used in) investing activities 301 — (2,272 ) (536 ) (2,507 ) Financing activities Net change in short-term borrowings — third party (15 ) — (3,453 ) — (3,468 ) Net increase in deposits — — 10,126 7 10,133 Proceeds from issuance of long-term debt — third party 756 — 3,834 — 4,590 Repayments of long-term debt — third party (1,116 ) — (10,256 ) — (11,372 ) Net change in debt — intercompany (74 ) — (216 ) 290 — Repurchase of common stock (440 ) — — — (440 ) Dividends paid — third party (139 ) — — — (139 ) Dividends paid and returns of contributed capital — intercompany — (900 ) (1,061 ) 1,961 — Capital contributions from parent — — 1 (1 ) — Net cash used in financing activities (1,028 ) (900 ) (1,025 ) 2,257 (696 ) Effect of exchange-rate changes on cash and cash equivalents and restricted cash — — 3 — 3 Net decrease in cash and cash equivalents and restricted cash (34 ) — (1,105 ) (217 ) (1,356 ) Cash and cash equivalents and restricted cash at beginning of year 1,398 — 5,998 (1,770 ) 5,626 Cash and cash equivalents and restricted cash at June 30, $ 1,364 $ — $ 4,893 $ (1,987 ) $ 4,270 The following table provides a reconciliation of cash and cash equivalents and restricted cash from the Condensed Consolidated Balance Sheet to the Condensed Consolidated Statement of Cash Flows. June 30, 2019 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Cash and cash equivalents on the Condensed Consolidated Balance Sheet $ 1,292 $ — $ 4,258 $ (1,987 ) $ 3,563 Restricted cash included in other assets on the Condensed Consolidated Balance Sheet (a) 72 — 635 — 707 Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows $ 1,364 $ — $ 4,893 $ (1,987 ) $ 4,270 (a) Restricted cash balances relate primarily to Ally securitization arrangements. Refer to Note 10 for additional details describing the nature of restricted cash balances. Six months ended June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Operating activities Net cash provided by operating activities $ 958 $ 1,500 $ 2,853 $ (3,302 ) $ 2,009 Investing activities Purchases of equity securities — — (500 ) — (500 ) Proceeds from sales of equity securities — — 535 — 535 Purchases of available-for-sale securities — — (4,094 ) — (4,094 ) Proceeds from sales of available-for-sale securities — — 390 — 390 Proceeds from repayments of available-for-sale securities — — 1,621 — 1,621 Purchases of held-to-maturity securities — — (316 ) — (316 ) Proceeds from repayments of held-to-maturity securities — — 72 — 72 Net change in investment securities — intercompany — — 17 (17 ) — Purchases of finance receivables and loans held-for-investment — — (3,431 ) 820 (2,611 ) Proceeds from sales of finance receivables and loans initially held-for-investment 820 — — (820 ) — Originations and repayments of finance receivables and loans held-for-investment and other, net 1,331 — (1,969 ) — (638 ) Net change in loans — intercompany 83 — (5 ) (78 ) — Purchases of operating lease assets — — (2,107 ) — (2,107 ) Disposals of operating lease assets 6 — 1,757 — 1,763 Capital contributions to subsidiaries (57 ) (6 ) — 63 — Returns of contributed capital 194 — — (194 ) — Net change in nonmarketable equity investments — — (46 ) — (46 ) Other, net (3 ) — (183 ) — (186 ) Net cash provided by (used in) investing activities 2,374 (6 ) (8,259 ) (226 ) (6,117 ) Financing activities Net change in short-term borrowings — third party (505 ) — (3,800 ) — (4,305 ) Net (decrease) increase in deposits (6 ) — 5,324 123 5,441 Proceeds from issuance of long-term debt — third party 32 — 12,908 — 12,940 Repayments of long-term debt — third party (2,412 ) — (7,388 ) — (9,800 ) Net change in debt — intercompany (138 ) — (83 ) 221 — Repurchase of common stock (380 ) — — — (380 ) Dividends paid — third party (115 ) — — — (115 ) Dividends paid and returns of contributed capital — intercompany — (1,500 ) (1,995 ) 3,495 — Capital contributions from parent — 6 57 (63 ) — Net cash (used in) provided by financing activities (3,524 ) (1,494 ) 5,023 3,776 3,781 Effect of exchange-rate changes on cash and cash equivalents and restricted cash — — (3 ) — (3 ) Net decrease in cash and cash equivalents and restricted cash (192 ) — (386 ) 248 (330 ) Cash and cash equivalents and restricted cash at beginning of year 1,395 — 5,707 (1,833 ) 5,269 Cash and cash equivalents and restricted cash at June 30, $ 1,203 $ — $ 5,321 $ (1,585 ) $ 4,939 The following table provides a reconciliation of cash and cash equivalents and restricted cash from the Condensed Consolidated Balance Sheet to the Condensed Consolidated Statement of Cash Flows. June 30, 2018 ($ in millions) Parent Guarantors Nonguarantors Consolidating adjustments Ally consolidated Cash and cash equivalents on the Condensed Consolidated Balance Sheet $ 1,071 $ — $ 4,438 $ (1,585 ) $ 3,924 Restricted cash included in other assets on the Condensed Consolidated Balance Sheet (a) 132 — 883 — 1,015 Total cash and cash equivalents and restricted cash in the Condensed Consolidated Statement of Cash Flows $ 1,203 $ — $ 5,321 $ (1,585 ) $ 4,939 (a) Restricted cash balances relate primarily to Ally securitization arrangements. Refer to Note 10 for additional details describing the nature of restricted cash balances.

Description of Business, Basi_3

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 172
Operating Lease, Liability	200
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 161
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	29
Operating Lease, Liability		$ 190
Accounting Standards Update 2017-08 | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	10
Accounting Standards Update 2017-08 | Accumulated other comprehensive (loss) income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (8)

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Apr. 01, 2019	Jan. 01, 2019	Apr. 01, 2018	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 183	$ 172	$ 362	$ 344
Other revenue	395	364	861	718
Insurance commissions	117	109	231	219
Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	212	192	499	374
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	21	18	43	37
Other revenue	34	19	59	52
Corporate and Other | Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	13	1	16	15
Noninsurance contracts
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	134	125	265	248
Unearned revenue, remaining performance obligation, amount	2,800	2,600	2,800	2,600	$ 2,700	$ 2,600	$ 2,500	$ 2,500
Unearned revenue, revenue recognized	202	195	401	389
Deferred commissions	1,600	1,500	1,600	1,500	$ 1,600	$ 1,500	$ 1,400	$ 1,400
Insurance commissions	114	106	225	209
Noninsurance contracts | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19	21	37	44
Remarketing fee income | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	15	34	31
Brokerage commissions and other revenue | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	17	15	34	31
Deposit account and other banking fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	3	9	6
Deposit account and other banking fees | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	3	9	6
Brokered/agent commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	4	7	8
Brokered/agent commissions | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	4	10	7
Other | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	25	47	50
Other revenue	61	63	129	129
Automotive Finance operations | Operating Segments | Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	37	38	82	79
Automotive Finance operations | Noninsurance contracts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Automotive Finance operations | Remarketing fee income | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	19	21	37	44
Automotive Finance operations | Brokerage commissions and other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Automotive Finance operations | Deposit account and other banking fees | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Automotive Finance operations | Brokered/agent commissions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Automotive Finance operations | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5	4	10	6
Automotive Finance operations | Sale of off-lease vehicles
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	23	16	38	34
Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	138	129	272	257
Other revenue	286	266	646	512
Insurance operations | Operating Segments | Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	148	137	374	255
Insurance operations | Noninsurance contracts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	134	125	265	248
Insurance operations | Remarketing fee income | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Insurance operations | Brokerage commissions and other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Insurance operations | Deposit account and other banking fees | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Insurance operations | Brokered/agent commissions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	4	7	8
Insurance operations | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	1
Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other revenue	4	2	6	3
Mortgage Finance operations | Operating Segments | Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	4	2	6	3
Mortgage Finance operations | Noninsurance contracts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Mortgage Finance operations | Remarketing fee income | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Mortgage Finance operations | Brokerage commissions and other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Mortgage Finance operations | Deposit account and other banking fees | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Mortgage Finance operations | Brokered/agent commissions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Mortgage Finance operations | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other revenue	10	14	21	22
Corporate Finance operations | Operating Segments | Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	10	14	21	22
Corporate Finance operations | Noninsurance contracts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate Finance operations | Remarketing fee income | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate Finance operations | Brokerage commissions and other revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate Finance operations | Deposit account and other banking fees | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate Finance operations | Brokered/agent commissions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Corporate Finance operations | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	$ 0	0	$ 0
2019 | Noninsurance contracts
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	380		380
2020 | Noninsurance contracts
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	705		705
2021 | Noninsurance contracts
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	605		605
2022 | Noninsurance contracts
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	473		473
2023 and thereafter | Noninsurance contracts
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	$ 595		$ 595

Other Income, Net of Losses (Sc

Other Income, Net of Losses (Schedule of Other Income, Net of Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Nonoperating Income (Expense) [Abstract]
Late charges and other administrative fees	$ 28	$ 25	$ 57	$ 54
Remarketing fees	19	21	37	44
Income from equity-method investments	8	7	12	13
Servicing fees	4	8	10	16
Other income, net	34	36	64	79
Total other income, net of losses	$ 93	$ 97	$ 180	$ 206

Reserves for Insurance Losses_3

Reserves for Insurance Losses and Loss Adjustment Expenses Reserves for Insurance Losses and Loss Adjustment Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for insurance losses and loss adjustment expenses			$ 134	$ 140
Reinsurance recoverable			96	108
Net reserves for insurance losses and loss adjustment expenses			38	32
Net insurance losses and loss adjustment expenses, current year			186	159
Net insurance losses and loss adjustment expenses, prior years			0	5
Net insurance losses and loss adjustment expenses incurred	$ 127	$ 101	186	164
Net insurance losses and loss adjustment expenses paid or payable, current year			(134)	(121)
Net insurance losses and loss adjustment expenses paid or payable, prior years			(27)	(26)
Total net insurance losses and loss adjustment expenses paid or payable			(161)	(147)
Net reserves for insurance losses and loss adjustment expenses	63	49	63	49
Reinsurance recoverable	90	100	90	100
Gross reserves for insurance losses and loss adjustment expenses	$ 153	$ 149	$ 153	$ 149

Other Operating Expenses (Sched

Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Expenses [Abstract]
Insurance commissions	$ 117	$ 109	$ 231	$ 219
Technology and communications	73	74	150	145
Advertising and marketing	35	29	83	68
Lease and loan administration	43	40	82	82
Professional services	30	35	59	67
Regulatory and licensing fees	28	35	56	65
Vehicle remarketing and repossession	25	26	52	58
Premises and equipment depreciation	25	22	47	42
Occupancy	16	11	29	22
Non-income taxes	11	6	20	14
Amortization of intangible assets	3	3	6	6
Other operating expenses	52	56	96	103
Total other operating expenses	$ 458	$ 446	$ 911	$ 891

Investment Securities (Investme

Investment Securities (Investment Table) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Debt securities, available-for-sale, fair value	$ 28,688	$ 25,303
Debt securities, held-to-maturity, amortized cost	2,461	2,362
Held-to-maturity securities, fair value	2,374	2,307
Available-for-sale securities
Schedule of Investments [Line Items]
Securities pledged for Federal Home Loan Bank, at fair value	4,400	9,200
Securities, amount eligible to be repledged or sold by counterparty	615	821
US Treasury | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	2,023	1,911
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(12)	(60)
Debt securities, available-for-sale, fair value	2,018	1,851
US States and political subdivisions | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	585	816
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	13	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(17)
Debt securities, available-for-sale, fair value	598	802
Foreign government | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	146	145
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(1)
Debt securities, available-for-sale, fair value	149	145
Agency mortgage-backed residential | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	18,971	17,486
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	191	47
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(62)	(395)
Debt securities, available-for-sale, fair value	19,100	17,138
Agency mortgage-backed residential | Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	2,430	2,319
Debt securities, held-to-maturity, unrecognized gain	41	6
Debt securities, held-to-maturity, unrecognized loss	3	61
Held-to-maturity securities, fair value	2,468	2,264
Mortgage-backed residential | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	2,927	2,796
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	18	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(11)	(111)
Debt securities, available-for-sale, fair value	2,934	2,686
Agency mortgage-backed commercial | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	1,303	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	48	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt securities, available-for-sale, fair value	1,351	3
Mortgage-backed commercial | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	712	715
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1)	(2)
Debt securities, available-for-sale, fair value	713	714
Asset-backed | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	473	723
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	4	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(2)
Debt securities, available-for-sale, fair value	477	723
Asset-backed | Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	31	43
Debt securities, held-to-maturity, unrecognized gain	0	0
Debt securities, held-to-maturity, unrecognized loss	0	0
Held-to-maturity securities, fair value	31	43
Corporate debt | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	1,326	1,286
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	25	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3)	(46)
Debt securities, available-for-sale, fair value	1,348	1,241
Available-for-sale debt securities | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	28,466	25,881
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	311	56
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(89)	(634)
Debt securities, available-for-sale, fair value	28,688	25,303
Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	2,461	2,362
Debt securities, held-to-maturity, unrecognized gain	41	6
Debt securities, held-to-maturity, unrecognized loss	3	61
Held-to-maturity securities, fair value	2,499	2,307
Federal Home Loan Bank certificates and obligations | Held-to-maturity securities
Schedule of Investments [Line Items]
Securities pledged for Federal Home Loan Bank, at fair value	1,300	$ 1,200
Operating Segments | Insurance operations | Available-for-sale securities
Schedule of Investments [Line Items]
Deposit securities	$ 12

Investment Securities (Invest_2

Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 28,688	$ 25,303
Cash equivalents	129	35
Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost, before other-than-temporary impairment	$ 2,461	$ 2,362
Debt securities, held-to-maturity, yield	3.20%	3.20%
Debt securities, held-to-maturity, maturity, within one year, amortized Cost	$ 0	$ 0
Debt securities, held-to-maturity, due in one year or less, yield	0.00%	0.00%
Debt securities, held-to-maturity, maturity, one through five years, amortized Cost	$ 31	$ 42
Debt securities, held-to-maturity, due after one year through five years, yield	2.10%	2.00%
Debt securities, held-to-maturity, maturity, after five through ten years, amortized cost	$ 0	$ 1
Debt securities, held-to-maturity, due after five years through ten years, yield	0.00%	3.30%
Debt securities, held-to-maturity, maturity, after 10 Years, amortized cost	$ 2,430	$ 2,319
Debt securities, held-to-maturity, due after ten years, yield	3.20%	3.20%
Available-for-sale securities | US Treasury
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 2,018	$ 1,851
Debt securities, available-for-sale, yield	1.70%	1.90%
Debt securities, available-for-sale, due in one year or less	$ 73	$ 12
Debt securities, available-for-sale, due in one year or less, yield	2.00%	1.00%
Debt securities, available-for-sale, due after one year through five years	$ 1,430	$ 1,277
Debt securities, available-for-sale, due after one year through five years, yield	1.60%	1.80%
Debt securities, available-for-sale, due after five years through ten years	$ 515	$ 562
Debt securities, available-for-sale, due after five years through ten years, yield	1.80%	2.00%
Debt securities, available-for-sale, due after ten years	$ 0	$ 0
Debt securities, available-for-sale, due after ten years, yield	0.00%	0.00%
Debt securities, available-for-sale, amortized cost	$ 2,023	$ 1,911
Available-for-sale securities | US States and political subdivisions
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 598	$ 802
Debt securities, available-for-sale, yield	3.10%	3.00%
Debt securities, available-for-sale, due in one year or less	$ 33	$ 49
Debt securities, available-for-sale, due in one year or less, yield	3.30%	1.90%
Debt securities, available-for-sale, due after one year through five years	$ 47	$ 43
Debt securities, available-for-sale, due after one year through five years, yield	2.30%	2.30%
Debt securities, available-for-sale, due after five years through ten years	$ 153	$ 252
Debt securities, available-for-sale, due after five years through ten years, yield	2.80%	2.60%
Debt securities, available-for-sale, due after ten years	$ 365	$ 458
Debt securities, available-for-sale, due after ten years, yield	3.40%	3.40%
Debt securities, available-for-sale, amortized cost	$ 585	$ 816
Available-for-sale securities | Foreign government
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 149	$ 145
Debt securities, available-for-sale, yield	2.30%	2.40%
Debt securities, available-for-sale, due in one year or less	$ 4	$ 18
Debt securities, available-for-sale, due in one year or less, yield	1.20%	3.10%
Debt securities, available-for-sale, due after one year through five years	$ 67	$ 60
Debt securities, available-for-sale, due after one year through five years, yield	2.20%	2.30%
Debt securities, available-for-sale, due after five years through ten years	$ 78	$ 67
Debt securities, available-for-sale, due after five years through ten years, yield	2.40%	2.40%
Debt securities, available-for-sale, due after ten years	$ 0	$ 0
Debt securities, available-for-sale, due after ten years, yield	0.00%	0.00%
Debt securities, available-for-sale, amortized cost	$ 146	$ 145
Available-for-sale securities | Agency mortgage-backed residential
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 19,100	$ 17,138
Debt securities, available-for-sale, yield	3.40%	3.30%
Debt securities, available-for-sale, due in one year or less	$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield	0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years	$ 0	$ 0
Debt securities, available-for-sale, due after one year through five years, yield	0.00%	0.00%
Debt securities, available-for-sale, due after five years through ten years	$ 50	$ 54
Debt securities, available-for-sale, due after five years through ten years, yield	1.90%	1.90%
Debt securities, available-for-sale, due after ten years	$ 19,050	$ 17,084
Debt securities, available-for-sale, due after ten years, yield	3.40%	3.30%
Debt securities, available-for-sale, amortized cost	$ 18,971	$ 17,486
Available-for-sale securities | Mortgage-backed residential
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 2,934	$ 2,686
Debt securities, available-for-sale, yield	3.30%	3.30%
Debt securities, available-for-sale, due in one year or less	$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield	0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years	$ 0	$ 0
Debt securities, available-for-sale, due after one year through five years, yield	0.00%	0.00%
Debt securities, available-for-sale, due after five years through ten years	$ 0	$ 0
Debt securities, available-for-sale, due after five years through ten years, yield	0.00%	0.00%
Debt securities, available-for-sale, due after ten years	$ 2,934	$ 2,686
Debt securities, available-for-sale, due after ten years, yield	3.30%	3.30%
Debt securities, available-for-sale, amortized cost	$ 2,927	$ 2,796
Available-for-sale securities | Agency mortgage-backed commercial
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 1,351	$ 3
Debt securities, available-for-sale, yield	3.10%	3.10%
Debt securities, available-for-sale, due in one year or less	$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield	0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years	$ 3	$ 3
Debt securities, available-for-sale, due after one year through five years, yield	3.20%	3.10%
Debt securities, available-for-sale, due after five years through ten years	$ 932	$ 0
Debt securities, available-for-sale, due after five years through ten years, yield	3.10%	0.00%
Debt securities, available-for-sale, due after ten years	$ 416	$ 0
Debt securities, available-for-sale, due after ten years, yield	3.10%	0.00%
Debt securities, available-for-sale, amortized cost	$ 1,303	$ 3
Available-for-sale securities | Mortgage-backed commercial
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 713	$ 714
Debt securities, available-for-sale, yield	3.70%	3.80%
Debt securities, available-for-sale, due in one year or less	$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield	0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years	$ 0	$ 0
Debt securities, available-for-sale, due after one year through five years, yield	0.00%	0.00%
Debt securities, available-for-sale, due after five years through ten years	$ 36	$ 46
Debt securities, available-for-sale, due after five years through ten years, yield	3.90%	3.90%
Debt securities, available-for-sale, due after ten years	$ 677	$ 668
Debt securities, available-for-sale, due after ten years, yield	3.70%	3.80%
Debt securities, available-for-sale, amortized cost	$ 712	$ 715
Available-for-sale securities | Asset-backed
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 477	$ 723
Debt securities, available-for-sale, yield	3.40%	3.50%
Debt securities, available-for-sale, due in one year or less	$ 0	$ 0
Debt securities, available-for-sale, due in one year or less, yield	0.00%	0.00%
Debt securities, available-for-sale, due after one year through five years	$ 328	$ 478
Debt securities, available-for-sale, due after one year through five years, yield	3.40%	3.40%
Debt securities, available-for-sale, due after five years through ten years	$ 74	$ 121
Debt securities, available-for-sale, due after five years through ten years, yield	3.90%	4.00%
Debt securities, available-for-sale, due after ten years	$ 75	$ 124
Debt securities, available-for-sale, due after ten years, yield	3.10%	3.30%
Debt securities, available-for-sale, amortized cost	$ 473	$ 723
Available-for-sale securities | Corporate debt
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 1,348	$ 1,241
Debt securities, available-for-sale, yield	3.20%	3.10%
Debt securities, available-for-sale, due in one year or less	$ 143	$ 144
Debt securities, available-for-sale, due in one year or less, yield	3.00%	2.80%
Debt securities, available-for-sale, due after one year through five years	$ 549	$ 496
Debt securities, available-for-sale, due after one year through five years, yield	3.00%	2.90%
Debt securities, available-for-sale, due after five years through ten years	$ 634	$ 581
Debt securities, available-for-sale, due after five years through ten years, yield	3.40%	3.30%
Debt securities, available-for-sale, due after ten years	$ 22	$ 20
Debt securities, available-for-sale, due after ten years, yield	5.60%	5.50%
Debt securities, available-for-sale, amortized cost	$ 1,326	$ 1,286
Available-for-sale securities | Available-for-sale debt securities
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 28,688	$ 25,303
Debt securities, available-for-sale, yield	3.20%	3.20%
Debt securities, available-for-sale, due in one year or less	$ 253	$ 223
Debt securities, available-for-sale, due in one year or less, yield	2.70%	2.60%
Debt securities, available-for-sale, due after one year through five years	$ 2,424	$ 2,357
Debt securities, available-for-sale, due after one year through five years, yield	2.20%	2.40%
Debt securities, available-for-sale, due after five years through ten years	$ 2,472	$ 1,683
Debt securities, available-for-sale, due after five years through ten years, yield	2.90%	2.80%
Debt securities, available-for-sale, due after ten years	$ 23,539	$ 21,040
Debt securities, available-for-sale, due after ten years, yield	3.40%	3.30%
Debt securities, available-for-sale, amortized cost	$ 28,466	$ 25,881
Debt securities, available-for-sale, maturity, within one year, amortized cost	253	224
Debt securities, available-for-sale, maturity, after one through five years, amortized cost	2,420	2,405
Debt securities, available-for-sale, maturity, after five through ten years, amortized cost	2,412	1,743
Debt securities, available-for-sale, maturity, after 10 Years, amortized cost	23,381	21,509
Held-to-maturity securities | Agency mortgage-backed residential
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost, before other-than-temporary impairment	$ 2,430	$ 2,319
Debt securities, held-to-maturity, yield	3.20%	3.20%
Debt securities, held-to-maturity, maturity, within one year, amortized Cost	$ 0	$ 0
Debt securities, held-to-maturity, due in one year or less, yield	0.00%	0.00%
Debt securities, held-to-maturity, maturity, one through five years, amortized Cost	$ 0	$ 0
Debt securities, held-to-maturity, due after one year through five years, yield	0.00%	0.00%
Debt securities, held-to-maturity, maturity, after five through ten years, amortized cost	$ 0	$ 0
Debt securities, held-to-maturity, due after five years through ten years, yield	0.00%	0.00%
Debt securities, held-to-maturity, maturity, after 10 Years, amortized cost	$ 2,430	$ 2,319
Debt securities, held-to-maturity, due after ten years, yield	3.20%	3.20%
Held-to-maturity securities | Asset-backed
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost, before other-than-temporary impairment	$ 31	$ 43
Debt securities, held-to-maturity, yield	3.10%	2.00%
Debt securities, held-to-maturity, maturity, within one year, amortized Cost	$ 0	$ 0
Debt securities, held-to-maturity, due in one year or less, yield	0.00%	0.00%
Debt securities, held-to-maturity, maturity, one through five years, amortized Cost	$ 31	$ 42
Debt securities, held-to-maturity, due after one year through five years, yield	2.10%	2.00%
Debt securities, held-to-maturity, maturity, after five through ten years, amortized cost	$ 0	$ 1
Debt securities, held-to-maturity, due after five years through ten years, yield	0.00%	3.30%
Debt securities, held-to-maturity, maturity, after 10 Years, amortized cost	$ 0	$ 0
Debt securities, held-to-maturity, due after ten years, yield	0.00%	0.00%

Investment Securities (Invest_3

Investment Securities (Investment Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Taxable interest	$ 220	$ 164	$ 434	$ 318
Taxable dividends	3	3	6	6
Interest and dividends exempt from U.S. federal income tax	4	6	9	12
Interest and Dividends on investment securities	244	188	484	364
Excludes other earning assets
Interest and Dividends on investment securities	$ 227	$ 173	$ 449	$ 336

Investment Securities (Schedule

Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Securities, Available-for-sale [Abstract]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities			$ 0	$ 0
Available-for-sale securities, gross realized gains	$ 24	$ 1	34	7
Available-for-sale securities, gross realized losses	0	0	(1)	0
Net realized gains on available-for-sale securities	24	1	33	7
Net realized gain on equity securities	10	18	39	40
Net unrealized gain (loss) on equity securities	5	8	75	(32)
Other gain on investments, net	$ 39	$ 27	$ 147	$ 15

Investment Securities (Schedu_2

Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	$ 1,395	$ 8,074
Debt securities, available-for-sale, unrealized loss, less than 12 months	(2)	(138)
Debt securities, available-for-sale, fair value, 12 months or longer	8,865	12,046
Debt securities, available-for-sale, unrealized loss, 12 months or longer	(87)	(496)
Debt Securities, held-to-maturity, less than 12 Months, fair value	458	473
Debt securities, held-to-maturity, unrealized loss, less than 12 Months	(3)	(6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value	0	1,395
Debt securities, held-to-maturity, unrealized loss, 12 months or longer	0	(55)
US Treasury
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	0	31
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	0
Debt securities, available-for-sale, fair value, 12 months or longer	1,532	1,758
Debt securities, available-for-sale, unrealized loss, 12 months or longer	(12)	(60)
US States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	0	259
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(3)
Debt securities, available-for-sale, fair value, 12 months or longer	46	317
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(14)
Foreign government
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	5	6
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	0
Debt securities, available-for-sale, fair value, 12 months or longer	8	74
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(1)
Agency mortgage-backed residential
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	1,033	5,537
Debt securities, available-for-sale, unrealized loss, less than 12 months	(1)	(94)
Debt securities, available-for-sale, fair value, 12 months or longer	5,713	7,808
Debt securities, available-for-sale, unrealized loss, 12 months or longer	(61)	(301)
Debt Securities, held-to-maturity, less than 12 Months, fair value	447	457
Debt securities, held-to-maturity, unrealized loss, less than 12 Months	(3)	(6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value	0	1,376
Debt securities, held-to-maturity, unrealized loss, 12 months or longer	0	(55)
Mortgage-backed residential
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	26	1,024
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(20)
Debt securities, available-for-sale, fair value, 12 months or longer	1,235	1,360
Debt securities, available-for-sale, unrealized loss, 12 months or longer	(11)	(91)
Agency mortgage-backed commercial
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	10	0
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	0
Debt securities, available-for-sale, fair value, 12 months or longer	0	0
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Mortgage-backed commercial
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	280	347
Debt securities, available-for-sale, unrealized loss, less than 12 months	(1)	(1)
Debt securities, available-for-sale, fair value, 12 months or longer	0	36
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(1)
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	6	294
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(1)
Debt securities, available-for-sale, fair value, 12 months or longer	75	124
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(1)
Debt Securities, held-to-maturity, less than 12 Months, fair value	11	16
Debt securities, held-to-maturity, unrealized loss, less than 12 Months	0	0
Debt Securities, held-to-maturity, 12 Months or Longer, fair value	0	19
Debt securities, held-to-maturity, unrealized loss, 12 months or longer	0	0
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	35	576
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(19)
Debt securities, available-for-sale, fair value, 12 months or longer	256	569
Debt securities, available-for-sale, unrealized loss, 12 months or longer	$ (3)	$ (27)

Finance Receivables and Loans_3

Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 129,210,000,000	$ 129,926,000,000	$ 125,544,000,000
Unamortized premiums and discounts and deferred fees and costs	577,000,000	587,000,000
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	90,698,000,000	87,240,000,000
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	72,898,000,000	70,539,000,000	70,473,000,000
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	17,800,000,000	16,701,000,000	15,131,000,000
Consumer portfolio segment | Mortgage Finance operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	16,485,000,000	15,155,000,000
Interest-only mortgage loans	$ 12,000,000	18,000,000
Interest Only Mortgage Percentage Beginning Principal Amortization Current Year	34.00%
Interest Only Mortgage Percentage Beginning Principal Amortization Next Year	41.00%
Consumer portfolio segment | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 1,315,000,000	1,546,000,000
Interest-only mortgage loans	$ 263,000,000	341,000,000
Interest-only mortgage loans having exited the interest-only period	99.00%
Commercial portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 38,512,000,000	42,686,000,000	$ 39,940,000,000
Commercial portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	29,382,000,000	33,672,000,000
Commercial portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	4,777,000,000	4,809,000,000
Commercial portfolio segment | Other loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 4,353,000,000	$ 4,205,000,000

Finance Receivables and Loans_4

Finance Receivables and Loans, Net (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	$ 1,288,000,000	$ 1,278,000,000	$ 1,242,000,000	$ 1,276,000,000
Allowance for loan and lease losses, charge-offs	(318,000,000)	(306,000,000)	(678,000,000)	(683,000,000)
Allowance for loan and lease losses, recoveries	136,000,000	126,000,000	259,000,000	244,000,000
Allowance for loan and lease losses, net charge-offs	(182,000,000)	(180,000,000)	(419,000,000)	(439,000,000)
Provision for loan losses	177,000,000	158,000,000	459,000,000	419,000,000
Allowance for Loan and Lease Losses, Adjustments, Other	(1,000,000)	1,000,000	0	1,000,000
Allowance for loan losses	1,282,000,000	1,257,000,000	1,282,000,000	1,257,000,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, individually evaluated for impairment	111,000,000	93,000,000	111,000,000	93,000,000
Allowance for loan losses, collectively evaluated for impairment	1,171,000,000	1,164,000,000	1,171,000,000	1,164,000,000
Finance receivables and loans, net	129,210,000,000	125,544,000,000	129,210,000,000	125,544,000,000	$ 129,926,000,000
Finance receivables and loans, individually evaluated for impairment	912,000,000	906,000,000	912,000,000	906,000,000
Finance receivables and loans, collectively evaluated for impairment	128,298,000,000	124,638,000,000	128,298,000,000	124,638,000,000
Consumer portfolio segment
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Finance receivables and loans, net	90,698,000,000		90,698,000,000		87,240,000,000
Consumer portfolio segment | Automotive loan
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	1,070,000,000	1,066,000,000	1,048,000,000	1,066,000,000
Allowance for loan and lease losses, charge-offs	(301,000,000)	(296,000,000)	(653,000,000)	(661,000,000)
Allowance for loan and lease losses, recoveries	129,000,000	114,000,000	247,000,000	226,000,000
Allowance for loan and lease losses, net charge-offs	(172,000,000)	(182,000,000)	(406,000,000)	(435,000,000)
Provision for loan losses	180,000,000	168,000,000	437,000,000	421,000,000
Allowance for Loan and Lease Losses, Adjustments, Other	0	1,000,000	(1,000,000)	1,000,000
Allowance for loan losses	1,078,000,000	1,053,000,000	1,078,000,000	1,053,000,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, individually evaluated for impairment	42,000,000	42,000,000	42,000,000	42,000,000
Allowance for loan losses, collectively evaluated for impairment	1,036,000,000	1,011,000,000	1,036,000,000	1,011,000,000
Finance receivables and loans, net	72,898,000,000	70,473,000,000	72,898,000,000	70,473,000,000	70,539,000,000
Finance receivables and loans, individually evaluated for impairment	496,000,000	480,000,000	496,000,000	480,000,000
Finance receivables and loans, collectively evaluated for impairment	72,402,000,000	69,993,000,000	72,402,000,000	69,993,000,000
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	52,000,000	74,000,000	53,000,000	79,000,000
Allowance for loan and lease losses, charge-offs	(5,000,000)	(8,000,000)	(8,000,000)	(20,000,000)
Allowance for loan and lease losses, recoveries	7,000,000	6,000,000	12,000,000	12,000,000
Allowance for loan and lease losses, net charge-offs	2,000,000	(2,000,000)	4,000,000	(8,000,000)
Provision for loan losses	(5,000,000)	(4,000,000)	(8,000,000)	(3,000,000)
Allowance for Loan and Lease Losses, Adjustments, Other	0	(2,000,000)	0	(2,000,000)
Allowance for loan losses	49,000,000	66,000,000	49,000,000	66,000,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, individually evaluated for impairment	20,000,000	24,000,000	20,000,000	24,000,000
Allowance for loan losses, collectively evaluated for impairment	29,000,000	42,000,000	29,000,000	42,000,000
Finance receivables and loans, net	17,800,000,000	15,131,000,000	17,800,000,000	15,131,000,000	16,701,000,000
Finance receivables and loans, individually evaluated for impairment	220,000,000	228,000,000	220,000,000	228,000,000
Finance receivables and loans, collectively evaluated for impairment	17,580,000,000	14,903,000,000	17,580,000,000	14,903,000,000
Commercial portfolio segment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	166,000,000	138,000,000	141,000,000	131,000,000
Allowance for loan and lease losses, charge-offs	(12,000,000)	(2,000,000)	(17,000,000)	(2,000,000)
Allowance for loan and lease losses, recoveries	0	6,000,000	0	6,000,000
Allowance for loan and lease losses, net charge-offs	(12,000,000)	4,000,000	(17,000,000)	4,000,000
Provision for loan losses	2,000,000	(6,000,000)	30,000,000	1,000,000
Allowance for Loan and Lease Losses, Adjustments, Other	(1,000,000)	2,000,000	1,000,000	2,000,000
Allowance for loan losses	155,000,000	138,000,000	155,000,000	138,000,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for loan losses, individually evaluated for impairment	49,000,000	27,000,000	49,000,000	27,000,000
Allowance for loan losses, collectively evaluated for impairment	106,000,000	111,000,000	106,000,000	111,000,000
Finance receivables and loans, net	38,512,000,000	39,940,000,000	38,512,000,000	39,940,000,000	42,686,000,000
Finance receivables and loans, individually evaluated for impairment	196,000,000	198,000,000	196,000,000	198,000,000
Finance receivables and loans, collectively evaluated for impairment	38,316,000,000	$ 39,742,000,000	38,316,000,000	$ 39,742,000,000
Commercial portfolio segment | Automotive loan
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Finance receivables and loans, net	29,382,000,000		29,382,000,000		33,672,000,000
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Finance receivables and loans, net	$ 4,777,000,000		$ 4,777,000,000		$ 4,809,000,000

Finance Receivables and Loans_5

Finance Receivables and Loans, Net (Schedule of Sales of Financing Receivables and Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, significant sales and transfers	$ 0	$ 4	$ 20	$ 5
Financing Receivable, Sale			131
Loans held-for-sale transferred to finance receivables and loans held-for-investment			79
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, significant sales and transfers	0	0	20	0
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, significant sales and transfers	$ 0	$ 4	$ 0	$ 5

Finance Receivables and Loans_6

Finance Receivables and Loans, Net (Schedule of Purchases of Financing Receivables and Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 899	$ 1,085	$ 2,233	$ 2,548
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	218	233	317	401
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	678	852	1,913	2,147
Commercial portfolio segment | Commercial loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 3	$ 0	$ 3	$ 0

Finance Receivables and Loans_7

Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	$ 2,765,000,000	$ 3,151,000,000
Financing receivable, recorded investment, current	126,445,000,000	126,775,000,000
Total finance receivables and loans	129,210,000,000	129,926,000,000	$ 125,544,000,000
Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,689,000,000	3,098,000,000
Financing receivable, recorded investment, current	88,009,000,000	84,142,000,000
Total finance receivables and loans	90,698,000,000	87,240,000,000
Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,519,000,000	2,940,000,000
Financing receivable, recorded investment, current	70,379,000,000	67,599,000,000
Total finance receivables and loans	72,898,000,000	70,539,000,000	70,473,000,000
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	170,000,000	158,000,000
Financing receivable, recorded investment, current	17,630,000,000	16,543,000,000
Total finance receivables and loans	17,800,000,000	16,701,000,000	15,131,000,000
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	95,000,000	76,000,000
Financing receivable, recorded investment, current	16,390,000,000	15,079,000,000
Total finance receivables and loans	16,485,000,000	15,155,000,000
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	75,000,000	82,000,000
Financing receivable, recorded investment, current	1,240,000,000	1,464,000,000
Total finance receivables and loans	1,315,000,000	1,546,000,000
Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	76,000,000	53,000,000
Financing receivable, recorded investment, current	38,436,000,000	42,633,000,000
Total finance receivables and loans	38,512,000,000	42,686,000,000	$ 39,940,000,000
Commercial portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	70,000,000	32,000,000
Financing receivable, recorded investment, current	29,312,000,000	33,640,000,000
Total finance receivables and loans	29,382,000,000	33,672,000,000
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	4,000,000	1,000,000
Financing receivable, recorded investment, current	4,773,000,000	4,808,000,000
Total finance receivables and loans	4,777,000,000	4,809,000,000
Commercial portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	2,000,000	20,000,000
Financing receivable, recorded investment, current	4,351,000,000	4,185,000,000
Total finance receivables and loans	4,353,000,000	4,205,000,000
Financing receivables, 30 to 59 days past due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,914,000,000	2,204,000,000
Financing receivables, 30 to 59 days past due | Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,911,000,000	2,204,000,000
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1,802,000,000	2,107,000,000
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	109,000,000	97,000,000
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	77,000,000	67,000,000
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	32,000,000	30,000,000
Financing receivables, 30 to 59 days past due | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	3,000,000	0
Financing receivables, 30 to 59 days past due | Commercial portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	3,000,000	0
Financing receivables, 30 to 59 days past due | Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Financing receivables, 30 to 59 days past due | Commercial portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Financing receivables, 60 to 89 days past due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	466,000,000	557,000,000
Financing receivables, 60 to 89 days past due | Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	466,000,000	552,000,000
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	444,000,000	537,000,000
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	22,000,000	15,000,000
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	9,000,000	5,000,000
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	13,000,000	10,000,000
Financing receivables, 60 to 89 days past due | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	5,000,000
Financing receivables, 60 to 89 days past due | Commercial portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	1,000,000
Financing receivables, 60 to 89 days past due | Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Financing receivables, 60 to 89 days past due | Commercial portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	4,000,000
Financing receivables, equal to greater than 90 days past due
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	385,000,000	390,000,000
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	312,000,000	342,000,000
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	273,000,000	296,000,000
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	39,000,000	46,000,000
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	9,000,000	4,000,000
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	30,000,000	42,000,000
Financing receivables, equal to greater than 90 days past due | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	73,000,000	48,000,000
Financing receivables, equal to greater than 90 days past due | Commercial portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	67,000,000	31,000,000
Financing receivables, equal to greater than 90 days past due | Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	4,000,000	1,000,000
Financing receivables, equal to greater than 90 days past due | Commercial portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	$ 2,000,000	$ 16,000,000

Finance Receivables and Loans_8

Finance Receivables and Loans, Net (Schedule of Financing Receivables, Non Accrual Status) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 903	$ 1,092
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	707	743
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	642	664
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	65	79
Consumer portfolio segment | Mortgage Finance operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	12	9
Consumer portfolio segment | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	53	70
Commercial portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	196	349
Commercial portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	89	203
Commercial portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	6	4
Commercial portfolio segment | Other loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 101	$ 142

Finance Receivables and Loans_9

Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 129,210	$ 129,926	$ 125,544
Consumer portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	90,698	87,240
Consumer portfolio segment | Performing Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	89,991	86,497
Consumer portfolio segment | Nonperforming Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	707	743
Consumer portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	72,898	70,539	70,473
Consumer portfolio segment | Automotive loan | Performing Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	72,256	69,875
Consumer portfolio segment | Automotive loan | Nonperforming Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	642	664
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	17,800	16,701	$ 15,131
Consumer portfolio segment | Real estate-backed loan | Performing Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	17,735	16,622
Consumer portfolio segment | Real estate-backed loan | Nonperforming Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	65	79
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	16,485	15,155
Consumer portfolio segment | Mortgage Finance operations | Performing Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	16,473	15,146
Consumer portfolio segment | Mortgage Finance operations | Nonperforming Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	12	9
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	1,315	1,546
Consumer portfolio segment | Mortgage - Legacy | Performing Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	1,262	1,476
Consumer portfolio segment | Mortgage - Legacy | Nonperforming Financial Instruments
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 53	$ 70

Finance Receivables and Loan_10

Finance Receivables and Loans, Net (Schedule of Pass And Criticized Credit Quality Indicators of Finance Receivables) (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 129,210,000,000	$ 129,926,000,000	$ 125,544,000,000
Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	38,512,000,000	42,686,000,000	$ 39,940,000,000
Commercial portfolio segment | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	34,726,000,000	38,710,000,000
Commercial portfolio segment | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	3,786,000,000	3,976,000,000
Commercial portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	29,382,000,000	33,672,000,000
Commercial portfolio segment | Automotive loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	26,629,000,000	30,799,000,000
Commercial portfolio segment | Automotive loan | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	2,753,000,000	2,873,000,000
Commercial portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	4,353,000,000	4,205,000,000
Commercial portfolio segment | Other loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	3,580,000,000	3,373,000,000
Commercial portfolio segment | Other loan | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	773,000,000	832,000,000
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	4,777,000,000	4,809,000,000
Commercial portfolio segment | Real estate-backed loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	4,517,000,000	4,538,000,000
Commercial portfolio segment | Real estate-backed loan | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 260,000,000	$ 271,000,000

Finance Receivables and Loan_11

Finance Receivables and Loans, Net (Impaired Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	$ 948	$ 1,105
Financing receivable, impaired, gross carrying value	912	1,075
Financing receivable, impaired, with no allowance	251	332
Financing receivable, impaired, with related allowance	661	743
Financing receivable, impaired, allowance for impaired loans	111	123
Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	731	739
Financing receivable, impaired, gross carrying value	716	726
Financing receivable, impaired, with no allowance	172	176
Financing receivable, impaired, with related allowance	544	550
Financing receivable, impaired, allowance for impaired loans	62	67
Consumer portfolio segment | Automotive loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	506	503
Financing receivable, impaired, gross carrying value	496	495
Financing receivable, impaired, with no allowance	101	105
Financing receivable, impaired, with related allowance	395	390
Financing receivable, impaired, allowance for impaired loans	42	44
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	225	236
Financing receivable, impaired, gross carrying value	220	231
Financing receivable, impaired, with no allowance	71	71
Financing receivable, impaired, with related allowance	149	160
Financing receivable, impaired, allowance for impaired loans	20	23
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	14	15
Financing receivable, impaired, gross carrying value	14	15
Financing receivable, impaired, with no allowance	6	6
Financing receivable, impaired, with related allowance	8	9
Financing receivable, impaired, allowance for impaired loans	0	1
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	211	221
Financing receivable, impaired, gross carrying value	206	216
Financing receivable, impaired, with no allowance	65	65
Financing receivable, impaired, with related allowance	141	151
Financing receivable, impaired, allowance for impaired loans	20	22
Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	217	366
Financing receivable, impaired, gross carrying value	196	349
Financing receivable, impaired, with no allowance	79	156
Financing receivable, impaired, with related allowance	117	193
Financing receivable, impaired, allowance for impaired loans	49	56
Commercial portfolio segment | Automotive loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	89	203
Financing receivable, impaired, gross carrying value	89	203
Financing receivable, impaired, with no allowance	18	112
Financing receivable, impaired, with related allowance	71	91
Financing receivable, impaired, allowance for impaired loans	19	10
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	6	4
Financing receivable, impaired, gross carrying value	6	4
Financing receivable, impaired, with no allowance	6	4
Financing receivable, impaired, with related allowance	0	0
Financing receivable, impaired, allowance for impaired loans	0	0
Commercial portfolio segment | Other loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, unpaid principal balance	122	159
Financing receivable, impaired, gross carrying value	101	142
Financing receivable, impaired, with no allowance	55	40
Financing receivable, impaired, with related allowance	46	102
Financing receivable, impaired, allowance for impaired loans	$ 30	$ 46

Finance Receivables and Loan_12

Finance Receivables and Loans, Net (Schedule of Average Balance and Interest Income of Impaired Finance Receivables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	$ 948	$ 865	$ 990	$ 822
Financing receivable, impaired, interest income	11	11	23	21
Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	721	700	724	691
Financing receivable, impaired, interest income	11	10	22	19
Consumer portfolio segment | Automotive loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	498	472	498	462
Financing receivable, impaired, interest income	9	7	17	14
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	223	228	226	229
Financing receivable, impaired, interest income	2	3	5	5
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	14	9	15	9
Financing receivable, impaired, interest income	0	0	0	0
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	209	219	211	220
Financing receivable, impaired, interest income	2	3	5	5
Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	227	165	266	131
Financing receivable, impaired, interest income	0	1	1	2
Commercial portfolio segment | Automotive loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	113	78	143	61
Financing receivable, impaired, interest income	0	1	1	2
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	6	5	6	4
Financing receivable, impaired, interest income	0	0	0	0
Commercial portfolio segment | Other loan
Financing Receivable, Impaired [Line Items]
Financing receivable, impaired, average balance	108	82	117	66
Financing receivable, impaired, interest income	$ 0	$ 0	$ 0	$ 0

Finance Receivables and Loan_13

Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, gross carrying value	$ 818		$ 818		$ 812
Loans and leases receivable, impaired, commitment to lend	$ 15		$ 15		$ 4
Financing receivable, modifications, number of loans	5,619	5,937	13,073	13,042
Financing receivable, modifications, pre-modification gross carrying value	$ 121	$ 174	$ 294	$ 313
Financing receivable, modifications, post-modification gross carrying value	$ 94	$ 157	$ 249	$ 277
Consumer portfolio segment
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	5,618	5,932	13,066	13,037
Financing receivable, modifications, pre-modification gross carrying value	$ 99	$ 115	$ 231	$ 254
Financing receivable, modifications, post-modification gross carrying value	$ 88	$ 102	$ 202	$ 222
Consumer portfolio segment | Automotive loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	5,598	5,898	13,025	12,940
Financing receivable, modifications, pre-modification gross carrying value	$ 96	$ 107	$ 225	$ 235
Financing receivable, modifications, post-modification gross carrying value	$ 85	$ 93	$ 196	$ 203
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	20	34	41	97
Financing receivable, modifications, pre-modification gross carrying value	$ 3	$ 8	$ 6	$ 19
Financing receivable, modifications, post-modification gross carrying value	$ 3	$ 9	$ 6	$ 19
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	2	7	3	8
Financing receivable, modifications, pre-modification gross carrying value	$ 0	$ 2	$ 0	$ 3
Financing receivable, modifications, post-modification gross carrying value	$ 0	$ 2	$ 0	$ 3
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	18	27	38	89
Financing receivable, modifications, pre-modification gross carrying value	$ 3	$ 6	$ 6	$ 16
Financing receivable, modifications, post-modification gross carrying value	$ 3	$ 7	$ 6	$ 16
Commercial portfolio segment
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	1	5	7	5
Financing receivable, modifications, pre-modification gross carrying value	$ 22	$ 59	$ 63	$ 59
Financing receivable, modifications, post-modification gross carrying value	$ 6	$ 55	$ 47	$ 55
Commercial portfolio segment | Automotive loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	0	3	6	3
Financing receivable, modifications, pre-modification gross carrying value	$ 0	$ 4	$ 41	$ 4
Financing receivable, modifications, post-modification gross carrying value	$ 0	$ 4	$ 41	$ 4
Commercial portfolio segment | Other loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	1	2	1	2
Financing receivable, modifications, pre-modification gross carrying value	$ 22	$ 55	$ 22	$ 55
Financing receivable, modifications, post-modification gross carrying value	$ 6	$ 51	$ 6	$ 51

Finance Receivables and Loan_14

Finance Receivables and Loans, Net (Finance receivables and loans redefaulted during the period) (Details) - Consumer portfolio segment $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)
Accounts, Notes, Loans and Financing Receivable
Financing receivable, modifications, subsequent default, number of loans	1,752	2,426	3,961	4,752
Financing receivable, modifications, subsequent default, gross carrying value	$ 20	$ 29	$ 46	$ 57
Financing receivables, impaired, troubled debt restructuring, charge-off amount	$ 12	$ 17	$ 28	$ 35
Automotive loan
Accounts, Notes, Loans and Financing Receivable
Financing receivable, modifications, subsequent default, number of loans	1,752	2,425	3,961	4,751
Financing receivable, modifications, subsequent default, gross carrying value	$ 20	$ 29	$ 46	$ 57
Financing receivables, impaired, troubled debt restructuring, charge-off amount	$ 12	$ 17	$ 28	$ 35
Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable
Financing receivable, modifications, subsequent default, number of loans	0	1	0	1
Financing receivable, modifications, subsequent default, gross carrying value	$ 0	$ 0	$ 0	$ 0
Financing receivables, impaired, troubled debt restructuring, charge-off amount	$ 0	$ 0	$ 0	$ 0

Leasing (Investments In Operati

Leasing (Investments In Operating Leases) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	7 years	7 years
Lessee, operating lease, noncancellable lease term		367 days
Lessee, operating lease, lease extension, maximum		48 months
Operating Lease, Right-of-Use Asset	$ 172	$ 172
Operating Lease, Liability	200	200
Cash paid for amounts included in the measurement of lease liabilities	$ 13	25
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 34
Operating lease, weighted average discount rate	2.97%	2.97%
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, option to terminate		P2Y
Lessor, Operating Lease, Lessee Option to Purchase Underlying Asset		P24M
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, option to terminate		P5Y
Lessor, Operating Lease, Lessee Option to Purchase Underlying Asset		P60M
Land and Building | Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Extend		P1Y
Land and Building | Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Extend		P15Y
Corporate Facilities | Minimum
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	3 months	3 months
Corporate Facilities | Maximum
Lessee, Lease, Description [Line Items]
Operating lease, weighted-average remaining lease term	13 years	13 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset			$ 161
Operating Lease, Liability			$ 190

Leasing Leasing (Lessee, Operat

Leasing Leasing (Lessee, Operating Lease, Liability, Maturity) (Details) $ in Millions	Jun. 30, 2019USD ($)
Leases [Abstract]
2019	$ 25
2020	48
2021	37
2022	25
2023	16
2024 and thereafter	71
Total undiscounted cash flows	222
Difference between undiscounted cash flows and discounted cash flows	(22)
Operating Lease, Liability	200
Lessee, Operating Lease, Lease Not yet Commenced, Undiscounted Future Lease Payments	$ 290
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	15 years

Leasing Leasing (Schedule of Fu

Leasing Leasing (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) $ in Millions	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 48
2020	47
2021	46
2022	37
2023	31
2024 and thereafter	294
Total minimum payments required	$ 503

Leasing Leasing (Lease, Cost) (

Leasing Leasing (Lease, Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease expense	$ 12	$ 11	$ 23	$ 21
Variable lease expense	2	1	4	3
Total lease expense, net	$ 14	$ 12	$ 27	$ 24

Leasing Leasing (Schedule of Pr

Leasing Leasing (Schedule of Property Subject to or Available for Operating Lease) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Residual value guarantee	15.00%
Vehicles available for operating lease, gross	$ 9,961	$ 9,995
Lessor Operating Lease Accumulated Depreciation	1,554	1,578
Investment in operating leases, net	$ 8,407	$ 8,417
Minimum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, lessee option to purchase underlying asset	P24M
Maximum
Lessor, Lease, Description [Line Items]
Lessor, operating lease, lessee option to purchase underlying asset	P60M
Vehicles
Lessor, Lease, Description [Line Items]
Operating Lease, Residual Value of Leased Asset	$ 366

Leasing Leasing (Lessor, Operat

Leasing Leasing (Lessor, Operating Lease, Payments to be Received, Maturity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
2019	$ 726		$ 726
2020	1,062		1,062
2021	536		536
2022	129		129
2023	16		16
2024 and thereafter	1		1
Total lease payments from operating leases	2,470		2,470
Operating Lease, Lease Income	$ 363	$ 374	$ 724	$ 756

Leasing Leasing (Depreciation E

Leasing Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases, Operating [Abstract]
Operating Lease, Lease Income	$ 363	$ 374	$ 724	$ 756
Depreciation expense on operating lease assets	262	281	523	572
Remarketing (gains) and losses, net	(23)	(16)	(38)	(34)
Net depreciation expense on operating lease assets	239	265	485	538
Variable lease payments, excessive wear and tear	$ 5	$ 6	$ 9	$ 13

Leasing Leasing (Sales-type and

Leasing Leasing (Sales-type and Direct Financing Leases, Lease Receivable, Maturity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Leases [Abstract]
Direct financing lease, net investment in lease	$ 492		$ 492		$ 439
Direct financing lease, present value of lease payments recorded as lease receivable	478		478		425
Direct financing lease, unguaranteed residual asset	14		14		$ 14
Direct financing lease, interest income	6	$ 5	12	$ 11
2019	82		82
2020	157		157
2021	142		142
2022	79		79
2023	46		46
2024 and thereafter	32		32
Total undiscounted cash flows	538		538
Direct financing leases, lease receivable, difference between undiscounted cash flows and discounted cash flows	$ (60)		$ (60)

Securitizations and Variable _3

Securitizations and Variable Interest Entities (Schedule of Variable Interest Entities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Variable Interest Entity [Line Items]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale	$ 0	$ 0	$ 0	$ 0
Variable Interest Entitiy, Assets Deconsolidated	796		796		$ 1,235
Variable interest entity, maximum loss exposure	2,016		2,016		2,334
Variable interest entity, carrying value of assets for which we have continuing involvement	26,159		26,159		28,195
Variable interest entity, carrying value of liabilities for which we have continuing involvement	9,392		9,392		10,845
On-balance sheet variable interest entities | Consumer Automotive Industry Sector
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	16,123		16,123		16,255
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	6,016		6,016		6,573
Variable Interest Entity, Consolidated, Assets, Not Pledged	8,500		8,500		8,400
Variable Interest Entity, Consolidated, Liabilities, No Recourse	22		22		25
On-balance sheet variable interest entities | Commercial Automotive Industry Sector
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets	9,077		9,077		11,089
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	3,047		3,047		3,946
Off-balance sheet variable interest entities | Consumer Automotive Industry Sector
Variable Interest Entity [Line Items]
Variable interest entity, nonconsolidated, carrying amount, assets	33		33		45
Variable interest entity, nonconsolidated, carrying amount, liabilities	0		0		0
Variable Interest Entitiy, Assets Deconsolidated	796		796		1,235
Variable interest entity, maximum loss exposure	829		829		1,280
Off-balance sheet variable interest entities | Consumer Automotive Industry Sector | Held To Maturity Securities Location
Variable Interest Entity [Line Items]
Variable interest entity, nonconsolidated, carrying amount, assets	31		31		43
Off-balance sheet variable interest entities | Consumer Automotive Industry Sector | Other Assets
Variable Interest Entity [Line Items]
Variable interest entity, nonconsolidated, carrying amount, assets	2		2		2
Off-balance sheet variable interest entities | Commercial Other Industry Sector
Variable Interest Entity [Line Items]
Variable interest entity, nonconsolidated, carrying amount, assets	926		926		806
Variable interest entity, nonconsolidated, carrying amount, liabilities	329		329		326
Variable Interest Entitiy, Assets Deconsolidated	0		0		0
Variable interest entity, maximum loss exposure	$ 1,187		$ 1,187		$ 1,054

Securitizations and Variable _4

Securitizations and Variable Interest Entities (Schedule of Cash Flow Received from and Paid to Nonconsolidated Securitization Entities) (Details) - Off-balance sheet variable interest entities - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Consumer Automotive Industry Sector
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash flows received on retained interests in securitization entities	$ 13	$ 9
Cash flows between transferor and transferee, servicing fees	6	10
Cash flows between transferor and transferee, disbursement for repurchases during the period	(1)	(2)
Cash Flow Between Transferee and Transferor Representations And Warranties Obligations		0
Consumer Mortgage Industry Sector
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash flows received on retained interests in securitization entities	0	0
Cash flows between transferor and transferee, servicing fees	0	0
Cash flows between transferor and transferee, disbursement for repurchases during the period	$ 0	0
Cash Flow Between Transferee and Transferor Representations And Warranties Obligations		$ 2

Securitizations and Variable _5

Securitizations and Variable Interest Entities (Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together) (Details) - Consumer Automotive Industry Sector - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Loans managed and securitized, principal amount outstanding	$ 1,188		$ 1,188		$ 1,869
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period	11		11		16
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Net Credit Losses During Period	3	$ 2	5	$ 6
Whole Loan Sales
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Loans managed and securitized, principal amount outstanding	392		392		634
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period	2		2		3
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Net Credit Losses During Period	1	0	1	1
Variable Interest Entity, Not Primary Beneficiary [Member]
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Loans managed and securitized, principal amount outstanding	796		796		1,235
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period	9		9		$ 13
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Net Credit Losses During Period	$ 2	$ 2	$ 4	$ 5

Other Assets (Schedule of Other

Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Other Assets [Abstract]
Property and equipment at cost	$ 1,245	$ 1,245	$ 1,250
Accumulated depreciation, property and equipment	(640)	(640)	(686)
Property and equipment, net	605	605	564
Nonmarketable equity securities	1,303	1,303	1,410
Investments in qualified affordable housing projects	724	724	649
Accrued interest, late fees, and rent receivables	631	631	599
Restricted cash collections for securitization trusts	608	608	965
Other accounts receivable	396	396	203
Equity method investments	317	317	262
Goodwill	240	240	240
Deferred tax assets, net	173	173	317
Restricted cash and cash equivalents	99	99	124
Fair value of derivative contracts in receivable position	59	59	41
Cash collateral placed with counterparties	9	9	26
Other assets, other	911	911	753
Total other assets	6,075	6,075	6,153
Federal Home Loan Bank stock	778	778	903
Federal Reserve Bank stock	448	448	448
Equity securities without a readily determinable fair value	77	77	59
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	7	7
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount	7	7
Impairment related to equity securities without a readily determinable fair value	3	3
Investments in qualified affordable housing projects, unfunded commitment	322	322	319
Goodwill [Line Items]
Goodwill	240	240	240
Corporate and Other
Other Assets [Abstract]
Goodwill	193	193	193
Goodwill [Line Items]
Goodwill	193	193	193
Insurance operations | Operating Segments
Other Assets [Abstract]
Goodwill	27	27	27
Goodwill [Line Items]
Goodwill	27	27	27
Automotive Finance operations | Operating Segments
Other Assets [Abstract]
Goodwill	20	20	20
Goodwill [Line Items]
Goodwill	$ 20	$ 20	$ 20

Deposit Liabilities (Schedule o

Deposit Liabilities (Schedule of Deposit Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Deposits [Abstract]
Noninterest-bearing deposits	$ 162	$ 142
Interest-bearing Deposit Liabilities, by Component [Abstract]
Interest-bearing deposits, savings and money-market checking accounts	62,078	56,050
Interest-bearing deposits, certificates of deposits	54,084	49,985
Interest-bearing deposits, other	1	1
Total deposit liabilities	116,325	106,178
Certificates of deposit, $100,000 or more	22,800	21,000
Certificates of deposit, in excess of $250,000 federal insurance limit	$ 6,900	$ 6,100

Debt (Schedule of Short-term De

Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Demand notes	$ 2,462	$ 2,477
Federal Home Loan Bank, advances	3,625	6,825
Securities sold under agreements to repurchase	432	685
Total short-term borrowings	6,519	9,987
Non-derivative Cash Collateral Placed with Counterparties Associated with the Repurchase Agreements		0
Non-derivative cash collateral received from counterparties associated with repurchase agreements	3	8
Non-derivative noncash collateral received from counterparties associated with repurchase agreements	1	4
Unsecured debt
Short-term Debt [Line Items]
Demand notes	2,462	2,477
Federal Home Loan Bank, advances	0	0
Securities sold under agreements to repurchase	0	0
Total short-term borrowings	2,462	2,477
Secured debt
Short-term Debt [Line Items]
Demand notes	0	0
Federal Home Loan Bank, advances	3,625	6,825
Securities sold under agreements to repurchase	432	685
Total short-term borrowings	4,057	$ 7,510
Secured debt | Maturity within 30 days
Short-term Debt [Line Items]
Financial instruments sold under agreements to repurchase	169
Secured debt | Maturity within 31 to 60 days
Short-term Debt [Line Items]
Financial instruments sold under agreements to repurchase	263
Secured debt | US Treasury
Short-term Debt [Line Items]
Financial instruments sold under agreements to repurchase	169
Secured debt | Agency mortgage-backed residential
Short-term Debt [Line Items]
Financial instruments sold under agreements to repurchase	$ 263

Debt (Long-term Debt) (Details)

Debt (Long-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, due within one year	$ 9,327	$ 8,976
Long-term debt, due after one year	28,139	35,217
Total long-term debt	37,466	44,193
Trust preferred securities	2,600	2,600
Secured Debt	29,452	39,596
Unsecured debt
Debt Instrument [Line Items]
Long-term debt, due within one year	2,613	1,663
Long-term debt, due after one year	9,458	10,444
Total long-term debt	12,071	12,107
Secured debt
Debt Instrument [Line Items]
Long-term debt, due within one year	6,714	7,313
Long-term debt, due after one year	18,681	24,773
Total long-term debt	25,395	32,086
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Secured Debt	$ 14,700	$ 14,900

Debt (Scheduled Remaining Matur

Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	$ 3,815
Long-term debt, maturities, repayments of principal in year two	9,092
Long-term debt, maturities, repayments of principal in year three	10,043
Long-term debt, maturities, repayments of principal in year four	6,459
Long-term debt, maturities, repayments of principal in year five	511
Long-term debt, maturities, repayments of principal after year five	7,546
Total long-term debt	37,466	$ 44,193
Unsecured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	852
Long-term debt, maturities, repayments of principal in year two	2,213
Long-term debt, maturities, repayments of principal in year three	650
Long-term debt, maturities, repayments of principal in year four	1,033
Long-term debt, maturities, repayments of principal in year five	(46)
Long-term debt, maturities, repayments of principal after year five	7,369
Total long-term debt	12,071	12,107
Secured debt
Debt Instrument [Line Items]
Total long-term debt	25,395	$ 32,086
Long-term debt | Unsecured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	873
Long-term debt, maturities, repayments of principal in year two	2,256
Long-term debt, maturities, repayments of principal in year three	696
Long-term debt, maturities, repayments of principal in year four	1,084
Long-term debt, maturities, repayments of principal in year five	11
Long-term debt, maturities, repayments of principal after year five	8,273
Total long-term debt	13,193
Long-term debt | Secured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	2,963
Long-term debt, maturities, repayments of principal in year two	6,879
Long-term debt, maturities, repayments of principal in year three	9,393
Long-term debt, maturities, repayments of principal in year four	5,426
Long-term debt, maturities, repayments of principal in year five	557
Long-term debt, maturities, repayments of principal after year five	177
Total long-term debt	25,395
Original issue discount | Unsecured debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount, current	(21)
Debt instrument, unamortized discount	(1,122)
Original issue discount | Unsecured debt | Debt instrument, redemption, period two
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(43)
Original issue discount | Unsecured debt | Debt instrument, redemption, period three
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(46)
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(51)
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(57)
Original issue discount | Unsecured debt | Debt instrument, redemption, period six
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	$ (904)

Debt (Pledged Assets Related to

Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Pledged Assets related to secured borrowings [Line Items]
Pledged financial instruments, investment securities	$ 5,517	$ 10,280
Pledged assets, mortgage assets held-for-investment and lending receivables	17,589	16,498
Pledged assets,operating leases	96	170
Pledged assets, restricted as collateral	48,225	59,526
Secured Debt	29,452	39,596
Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged financial instruments, investment securities	5,067	9,564
Pledged assets, mortgage assets held-for-investment and lending receivables	17,589	16,498
Pledged assets,operating leases	0	0
Pledged assets, restricted as collateral	43,711	51,340
Secured Debt	25,386	32,072
Pledged assets for Federal Home Loan Bank | Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, restricted as collateral	27,400	30,800
Pledged assets for Federal Reserve Bank | Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, restricted as collateral	2,400	2,400
Short-term borrowings
Pledged Assets related to secured borrowings [Line Items]
Secured Debt	4,100	7,500
Consumer portfolio segment | Consumer automotive
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	11,287	17,015
Consumer portfolio segment | Consumer automotive | Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	7,319	9,715
Commercial portfolio segment | Consumer automotive
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	13,736	15,563
Commercial portfolio segment | Consumer automotive | Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	$ 13,736	$ 15,563

Debt (Narrative - Trust Preferr

Debt (Narrative - Trust Preferred Securities) (Details) - USD ($) $ / shares in Units, $ in Billions	Jun. 30, 2019	Dec. 31, 2018
Narrative - Trust Preferred Securities [Line Items]
Trust preferred securities	$ 2.6	$ 2.6
Trust preferred securities, fixed rate, floating rate, percentage	8.125%
Preferred stock, liquidation amount per share	$ 25
Distribution payable in addition to annual rate equal to three-month London interbank offer rate, percentage	5.785%
Period of consecutive quarters for which Ally has right to defer interest payments, maximum	20
Redemption price, percentage of principal debt, plus accrued and unpaid interest	100.00%
Fixed income interest rate
Narrative - Trust Preferred Securities [Line Items]
Trust preferred securities	$ 2.6

Debt (Committed Funding Facilit

Debt (Committed Funding Facilities) (Details) - Committed funding facilities - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 3,300
Secured debt
Debt Instrument [Line Items]
Long-term line of credit	1,615	$ 6,665
Line of credit facility, remaining borrowing capacity	1,635	1,935
Line of credit facility, maximum borrowing capacity	3,250	8,600
Secured funding facilities, revolving, one year or greater
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	2,000
Ally Financial Inc | Secured debt
Debt Instrument [Line Items]
Long-term line of credit	1,365	3,165
Line of credit facility, remaining borrowing capacity	1,635	635
Line of credit facility, maximum borrowing capacity	3,000	3,800
Ally Bank | Secured debt
Debt Instrument [Line Items]
Long-term line of credit	250	3,500
Line of credit facility, remaining borrowing capacity	0	1,300
Line of credit facility, maximum borrowing capacity	$ 250	$ 4,800

Accrued Expenses and Other Li_3

Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 580	$ 516
Unfunded commitments for investment in qualified affordable housing projects	322	319
Employee compensation and benefits	197	255
Reserves for insurance losses and loss adjustment expenses	153	134	$ 149	$ 140
Cash collateral received from counterparties	38	41
Deferred revenue	28	27
Fair value of derivative contracts in payable position	4	37
Other liabilities	585	347
Total accrued expenses and other liabilities	$ 1,907	$ 1,676

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income (Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Accumulated other comprehensive income (loss), investment securities, adjustment, after tax	$ 133	$ (598)	$ 133	$ (598)	$ (158)	$ (473)	$ (481)	$ (524)	$ (186)	$ (173)
Other comprehensive income (loss), investment securities, net change, after tax	291	(74)	606	(412)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), translation adjustment, net of tax	19	19	19	19	18	18	18	19	20	16
Other comprehensive income (loss), foreign currency translation adjustment, net of tax	1	0	1	(1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, net of tax	28	28	28	28	11	19	19	25	11	11
Other comprehensive income (loss), cash flow hedges, net change, after tax	17	3	9	17
Other Comprehensive Income (Loss), Defined Benefit Plan, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), defined benefit pension plans, after tax	(96)	(97)	(96)	(97)	(96)	(95)	(95)	(98)	(95)	(89)
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, after tax	0	1	(1)	(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total accumulated other comprehensive loss, net of tax	(84)	648	(84)	648	$ 225	531	$ 539	$ 578	250	$ 235
Other comprehensive income (loss), net of tax	$ 309	$ (70)	$ 615	$ (398)
Accounting Standards Update 2016-01
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Accumulated other comprehensive income (loss), investment securities, adjustment, after tax									27
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), translation adjustment, net of tax									0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, net of tax									0
Other Comprehensive Income (Loss), Defined Benefit Plan, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), defined benefit pension plans, after tax									0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total accumulated other comprehensive loss, net of tax									(27)
Accounting Standards Update 2018-02
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Accumulated other comprehensive income (loss), investment securities, adjustment, after tax									(40)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), translation adjustment, net of tax									4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, net of tax									0
Other Comprehensive Income (Loss), Defined Benefit Plan, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), defined benefit pension plans, after tax									(6)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total accumulated other comprehensive loss, net of tax									$ 42
Accounting Standards Update 2017-08
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Accumulated other comprehensive income (loss), investment securities, adjustment, after tax						8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), translation adjustment, net of tax						0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, net of tax						0
Other Comprehensive Income (Loss), Defined Benefit Plan, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), defined benefit pension plans, after tax						0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total accumulated other comprehensive loss, net of tax						$ (8)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive (Loss) Income (Before and After Tax) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax [Abstract]
Other compehrensive income (loss), investment securities, net unrealized gains (losses) arising during the period, before tax	$ 404	$ (95)	$ 825	$ (531)
Other compehrensive income (loss), investement securities, net realized gains reclassified to income from continuing operations, before tax	24	1	33	7
Other comprehensive income, investment securities, net change, before tax	380	(96)	792	(538)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax [Abstract]
Other comprehensive income (loss), investment securities, unrealized holding gains (losses) arising during the period, tax	(95)	22	(194)	125
Other comprehensive income (loss), investment securities, net realized gains reclassified to income from continuing operations, tax effect	(6)	0	(8)	(1)
Other comprehensive income (loss), investment securities, net change, tax effect	(89)	22	(186)	126
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Other comprehensive income (loss), investment securities, net unrealized gains (losses) arising during the period, after tax	309	(73)	631	(406)
Other comprehensive income (loss), investment securities, net realized gains reclassified to income from continuing operations, after tax	18	1	25	6
Other comprehensive income (loss), investment securities, net change, after tax	291	(74)	606	(412)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Other comprehensive income (loss), translation adjustments, net change, before tax	4	(3)	6	(8)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Other comprehensive income (loss), translation adjustments, net unrealized gains (losses) arising during the period, tax effect	(1)	1	(2)	2
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Other comprehensive income (loss), translation adjustments, net unrealized gains (losses) arising during the period, after tax	3	(2)	4	(6)
Other Comprehensive Income (Loss), Net investment hedges, before Tax [Abstract]
Other comprehensive income (loss), net investment hedges, unrealized gains (losses) arising during the period, before tax	(3)	3	(5)	7
Other Comprehensive Income (Loss), Net investment hedges, Tax [Abstract]
Other comprehensive income (loss), net investment hedges, net unrealized gains arising during the period, tax effect	1	(1)	2	(2)
Other Comprehensive Income (Loss), Net investment hedges, Net of Tax [Abstract]
Net investment hedges, unrealized gains (losses) arising during the period, after tax	(2)	2	(3)	5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
Other comprehensive income (loss), cash flow hedges, net unrealized gains (losses) arising during the period before tax	26	5	21	23
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax	4		9
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	22		12
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]
Other comprehensive income (loss), cash flow hedges, net unrealized gains arising during the period, tax	(6)	(2)	(5)	(6)
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, tax	(1)		(2)
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, tax	(5)		(3)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Other comprehensive income (loss), cash flow hedges, net unrealized gains (losses) arising during the period	20	3	16	17
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax	3		7
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax	17		9
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax [Abstract]
Other comprehensive income (loss), defined benefit pension plans, net unrealized gains (losses) arising during period, before tax		1	(1)	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Tax [Abstract]
Other comprehensive income (loss), defined benefit pension plans, net unrealized gains (losses) arising during period, tax		0	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Net of Tax [Abstract]
Other comprehensive (income), defined benefit pension plans, net unrealized gains (losses) arising during period, after tax	0	1	(1)	(2)
Other Comprehensive Income (Loss), before Tax [Abstract]
Other comprehensive income (loss), before tax	403	(90)	804	(518)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss), tax effect	(94)	20	(189)	120
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss), net of tax	$ 309	$ (70)	$ 615	$ (398)

Earnings per Common Share (Sche

Earnings per Common Share (Schedule of Basic and Diluted Earnings per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income from continuing operations attributable to common stockholders	$ 584	$ 348	$ 959	$ 600
(Loss) income from discontinued operations, net of tax	(2)	1	(3)	(1)
Net income	$ 582	$ 349	$ 956	$ 599
Basic weighted-average common shares outstanding	398,100	430,628	401,098	433,405
Diluted weighted-average common shares outstanding	399,916	432,554	402,921	435,727
Earnings Per Share, Basic [Abstract]
Net income from continuing operations, basic earnings per common share	$ 1.47	$ 0.81	$ 2.39	$ 1.38
Loss from discontinued operations, net of tax, basic earnings per common share	0	0	(0.01)	0
Net income, basic earnings per common share	1.46	0.81	2.39	1.38
Earnings Per Share, Diluted [Abstract]
Net income from continuing operations, diluted earnings per common share	1.46	0.80	2.38	1.38
Loss from discontinued operations, net of tax, diluted earnings per common share	0	0	(0.01)	0
Net income, diluted earnings per common share	$ 1.46	$ 0.81	$ 2.37	$ 1.37

Regulatory Capital and Other _3

Regulatory Capital and Other Regulatory Matters (Schedule of Regulatory Capital Amount and Ratios) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
BHC enhanced prudential standards, minimum	$ 100,000
BHC enhanced prudential standards, maximum	250,000
BHC stress test threshold	$ 50,000
BHC capital requirement, dividend payout ratio	30.00%
Ally Financial Inc
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	9.52%	9.14%
Common equity tier one capital	$ 13,887	$ 13,397
Tier one capital to risk-weighted assets, amount	$ 16,319	$ 15,831
Tier one capital to risk-weighted assets, ratio	11.19%	10.80%
Capital to risk-weighted assets, amount	$ 18,572	$ 18,046
Capital to risk-weighted assets, ratio	12.73%	12.31%
Tier one leverage to adjusted quarterly average assets, amount	$ 16,319	$ 15,831
Tier one leverage to adjusted quarterly average assets, ratio	9.05%	9.00%
Ally Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	12.54%	12.61%
Common equity tier one capital	$ 16,739	$ 16,552
Tier one capital to risk-weighted assets, amount	$ 16,739	$ 16,552
Tier one capital to risk-weighted assets, ratio	12.54%	12.61%
Capital to risk-weighted assets, amount	$ 17,947	$ 17,620
Capital to risk-weighted assets, ratio	13.44%	13.42%
Tier one leverage to adjusted quarterly average assets, amount	$ 16,739	$ 16,552
Tier one leverage to adjusted quarterly average assets, ratio	10.26%	10.69%
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	4.50%
Tier one capital to risk-weighted assets, required minimum	6.00%
Capital to risk-weighted assets, required minimum	8.00%
Minimum capital conservation buffer	2.50%	1.875%
Tier one leverage ratio, minimum	4.00%
Minimum | Ally Financial Inc
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	4.50%
Tier one capital to risk-weighted assets, required minimum	6.00%
Capital to risk-weighted assets, required minimum	8.00%
Tier one leverage ratio, minimum	4.00%
Tier one capital to risk-weighted assets, well-capitalized minimum	6.00%
Capital to risk weighted assets, well-capitalzed minimum	10.00%
Minimum | Ally Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio	4.50%
Tier one capital to risk-weighted assets, required minimum	6.00%
Capital to risk-weighted assets, required minimum	8.00%
Tier one leverage ratio, minimum	4.00%
Common Equity Tier One Capital Ratio Required To Be Well Capitalized	6.50%
Tier one capital to risk-weighted assets, well-capitalized minimum	8.00%
Capital to risk weighted assets, well-capitalzed minimum	10.00%
Tier one leverage to adjusted quarterly average assets, well-capitalized minimum	5.00%

Regulatory Capital and Other _4

Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 16, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accelerated Share Repurchases [Line Items]
Treasury stock, common, amount		$ 229	$ 211	$ 309	$ 250	$ 195	$ 185
Treasury stock, common, shares		7,775,000	8,113,000	12,121,000	9,194,000	7,280,000	6,473,000
Common stock, shares outstanding		392,775,052	399,761,000	404,899,599	416,591,000	425,752,000	432,691,000	437,054,000
Dividends declared, amount per common share		$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.13	$ 0.13
Subsequent event
Accelerated Share Repurchases [Line Items]
Dividends declared, amount per common share	$ 0.17
Current period
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount		$ 1,000
Future Period
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount		$ 1,250
Increase (decrease) in share repurchase program		25.00%

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral placed with counterparties	$ 9	$ 26
Noncash collateral placed with counterparties	165	105
Cash collateral received from counterparties	25	30
Noncash collateral received from counterparties	$ 32	$ 3

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities (Fair Value Amounts of Derivative Instruments Reported on our Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	$ 59	$ 41
Fair value of derivative contracts in payable position	4	37
Derivative, notional amount	24,789	38,066
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	54	1
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	21,223	24,339
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	5	40
Fair value of derivative contracts in payable position	4	37
Derivative, notional amount	3,566	13,727
Interest rate contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	5	37
Fair value of derivative contracts in payable position	3	37
Derivative, notional amount	3,440	13,546
Interest rate swaps | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	16,986	24,203
Interest rate purchased options | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	54	0
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	4,100	0
Interest rate purchased options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	3	37
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	1,658	6,742
Interest rate futures and forwards | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	17	11
Interest rate written options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	2	0
Fair value of derivative contracts in payable position	3	37
Derivative, notional amount	1,765	6,793
Foreign exchange contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	3
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	126	181
Foreign exchange forwards | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	1
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	137	136
Foreign exchange futures And forwards | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	3
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	126	181
Equity contract | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	1	0
Derivative, notional amount	0	0
Equity written options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	0
Fair value of derivative contracts in payable position	1	0
Derivative, notional amount	$ 0	$ 0

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities (Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Discontinued Fair Value Hedge, Last-of-Layer, Amount	$ 12,800
Basis adjustment, last of layer hedging relationship		$ 0
Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	1,401	1,485
Cumulative basis adjustments for fair value hedges included in the carrying amount of hedged items	(11)	0
Amortized cost basis of the closed portfolios used in hedging relationships		47
Hedged asset, last-of-layer, amount		28
Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	46,111	40,850
Cumulative basis adjustments for fair value hedges included in the carrying amount of hedged items	(153)	(24)
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	57
Hedged asset, last-of-layer, amount	13,400	21,400
Hedge basis adjustment, last-of-layer		19
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	12,093	13,001
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	85	67
Fair Value Hedging | Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative basis adjustments for fair value hedges included in the carrying amount of hedged items	(94)
Discontinued hedge | Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	10	(5)
Discontinued hedge | Finance receivables and loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged asset, discontinued fair value hedge, cumulative increase (decrease)	59	5
Discontinued hedge | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	$ 66	$ 67

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities (Statement of Gains and Losses on Derivative Instruments Reported in Statement of Comprehensive Income) (Details) - Not designated as hedging instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	$ (4)	$ 4	$ (9)	$ 6
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	(2)	(2)	(6)	0
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	(2)	6	(3)	6
Gains on mortgage and automotive loans | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	0	0	1	0
Other income | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	(2)	(2)	(7)	0
Other income | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	$ (2)	$ 6	$ (3)	$ 6

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities (Derivative Instruments Designated as Fair Value Hedges, Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Interest and fees on finance receivables and loans	$ 1,860	$ 1,647	$ 3,667	$ 3,190
Interest and dividends on investment securities and other earning assets	244	188	484	364
Interest on deposits	651	399	1,243	750
Interest on long-term debt	407	434	826	845
Earnings on cash flow hedges to be recognized within twelve months			0
Interest and fees on finance receivables and loans | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Interest and fees on finance receivables and loans | Unsecured debt | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest and fees on finance receivables and loans | Federal Home Loan Bank certificates and obligations | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest and fees on finance receivables and loans | Available-for-sale securities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest and fees on finance receivables and loans | Fixed-rate automotive loans | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	98	(6)	141	(51)
Change in unrealized gain (loss) on fair value hedging instruments	(98)	6	(141)	51
Interest and fees on finance receivables and loans | Deposit liabilities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings			0	0
Interest and fees on finance receivables and loans | Variable-rate borrowings | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Interest and dividends on investment securities and other earning assets | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Interest and dividends on investment securities and other earning assets | Unsecured debt | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest and dividends on investment securities and other earning assets | Federal Home Loan Bank certificates and obligations | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest and dividends on investment securities and other earning assets | Available-for-sale securities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	2	(2)	12	(5)
Change in unrealized gain (loss) on fair value hedging instruments	(2)	2	(12)	5
Interest and dividends on investment securities and other earning assets | Fixed-rate automotive loans | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest and dividends on investment securities and other earning assets | Deposit liabilities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings			0	0
Interest and dividends on investment securities and other earning assets | Variable-rate borrowings | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Interest on deposits | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges			0	0
Derivative, Gain (Loss) on Derivative, Net			1	0
Interest on deposits | Unsecured debt | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge			0	0
Change in unrealized gain (loss) on fair value hedging instruments			0	0
Interest on deposits | Federal Home Loan Bank certificates and obligations | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge			0	0
Change in unrealized gain (loss) on fair value hedging instruments			0	0
Interest on deposits | Available-for-sale securities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge			0	0
Change in unrealized gain (loss) on fair value hedging instruments			0	0
Interest on deposits | Fixed-rate automotive loans | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge			0	0
Change in unrealized gain (loss) on fair value hedging instruments			0	0
Interest on deposits | Deposit liabilities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings			1	0
Interest on deposits | Variable-rate borrowings | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings			0	0
Interest on long-term debt | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges	0	0	0	1
Derivative, Gain (Loss) on Derivative, Net	4	0	8	0
Interest on long-term debt | Unsecured debt | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	(19)	8	(19)	44
Change in unrealized gain (loss) on fair value hedging instruments	19	(8)	19	(43)
Interest on long-term debt | Federal Home Loan Bank certificates and obligations | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	10	0	43
Change in unrealized gain (loss) on fair value hedging instruments	0	(10)	0	(43)
Interest on long-term debt | Available-for-sale securities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest on long-term debt | Fixed-rate automotive loans | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	0	0	0
Change in unrealized gain (loss) on fair value hedging instruments	0	0	0	0
Interest on long-term debt | Deposit liabilities | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings			0	0
Interest on long-term debt | Variable-rate borrowings | Designated as hedging instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	$ 4	$ 0	$ 8	$ 0

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities (Interest and Amortization on Derivative Instruments) (Details) - Designated as hedging instrument - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Interest And Amortization Income (Expense) Hedging Relationship	$ 2	$ 1	$ 4	$ (10)
Gain (loss) on cash flow hedging relationships	0	0	0	0
Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Total Interest And Amortization Income (Expense) Hedging Relationship	(1)	0	(1)	(1)
Gain (loss) on cash flow hedging relationships	0	0	0	0
Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Total Interest And Amortization Income (Expense) Hedging Relationship	1	12	1	31
Gain (loss) on cash flow hedging relationships	0	2	1	3
Unsecured debt | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Unsecured debt | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Unsecured debt | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	6	14	12	29
Gain (loss) on interest for qualifying hedge	0	1	0	4
Federal Home Loan Bank certificates and obligations | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Federal Home Loan Bank certificates and obligations | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Federal Home Loan Bank certificates and obligations | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	(5)	(5)	(11)	(6)
Gain (loss) on interest for qualifying hedge	0	2	0	4
Available-for-sale securities | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge			0	0
Available-for-sale securities | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	(1)	0	(1)	0
Gain (loss) on interest for qualifying hedge			0	(1)
Available-for-sale securities | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge			0	0
Fixed-rate automotive loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	(9)	(4)	(13)	(8)
Gain (loss) on interest for qualifying hedge	11	5	17	(2)
Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Fixed-rate automotive loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	0	0	0	0
Gain (loss) on interest for qualifying hedge	0	0	0	0
Variable-rate borrowings | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge	0	0	0	0
Variable-rate borrowings | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge	0	0	0	0
Variable-rate borrowings | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge	$ 0	$ 2	$ 0	$ 3

Derivative Instruments and He_9

Derivative Instruments and Hedging Activities (Derivative Instruments Used in Net Investment Hedge Accounting Relationships) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), net investment hedge, foreign exchange contracts	$ (3)	$ 3	$ (5)	$ 7
Interest rate contracts | Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), cash flow hedge, interest rate contracts	22	5	12	23
Foreign exchange contracts | Net investment hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), net investment hedge, foreign exchange contracts	(3)	3	(5)	7
Derivative, Excluded Component, Gain (Loss), Recognized in Earnings	0	0	0	0
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax	$ 0	$ 0	$ 0	$ 0

Income Taxes Income Taxes (Deta

Income Taxes Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense from continuing operations	$ (90)	$ 113	$ 21	$ 189
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 200

Fair Value (Fair Value Measurem

Fair Value (Fair Value Measurements - Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 591	$ 773
Derivative assets	3	37
Derivative liabilities	$ (1)	$ (37)
Investment in any one industry did not exceed percentage	14.00%	9.00%
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 28,688	$ 25,303
Derivative assets	59	41
Assets, fair value	29,363	26,129
Derivative liabilities	(4)	(37)
Liabilities, fair value	4	37
Fair value, measurements, recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(3)	(37)
Fair value, measurements, recurring | Other contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(1)
Fair value, measurements, recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	591	773
Fair value, measurements, recurring | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,018	1,851
Fair value, measurements, recurring | US States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	598	802
Fair value, measurements, recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	149	145
Fair value, measurements, recurring | Agency mortgage-backed | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	19,100	17,138
Fair value, measurements, recurring | Agency mortgage-backed | Commercial loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,351	3
Fair value, measurements, recurring | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,934	2,686
Fair value, measurements, recurring | Mortgage-backed commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	713	714
Fair value, measurements, recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	477	723
Fair value, measurements, recurring | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,348	1,241
Fair value, measurements, recurring | Loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value	22	8
Fair value, measurements, recurring | Retained interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained interest, fair value	3	4
Fair value, measurements, recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	59	37
Fair value, measurements, recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		4
Fair value, measurements, recurring | Fair value, inputs, level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,030	1,857
Derivative assets	0	0
Assets, fair value	2,612	2,623
Derivative liabilities	(1)	0
Liabilities, fair value	1	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Other contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(1)
Fair value, measurements, recurring | Fair value, inputs, level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	582	766
Fair value, measurements, recurring | Fair value, inputs, level 1 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,017	1,850
Fair value, measurements, recurring | Fair value, inputs, level 1 | US States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	13	7
Fair value, measurements, recurring | Fair value, inputs, level 1 | Agency mortgage-backed | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Agency mortgage-backed | Commercial loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Mortgage-backed commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Retained interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained interest, fair value	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0
Fair value, measurements, recurring | Fair value, inputs, level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26,658	23,446
Derivative assets	57	41
Assets, fair value	26,715	23,487
Derivative liabilities	(3)	(37)
Liabilities, fair value	3	37
Fair value, measurements, recurring | Fair value, inputs, level 2 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(3)	(37)
Fair value, measurements, recurring | Fair value, inputs, level 2 | Other contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1	1
Fair value, measurements, recurring | Fair value, inputs, level 2 | US States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	598	802
Fair value, measurements, recurring | Fair value, inputs, level 2 | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	136	138
Fair value, measurements, recurring | Fair value, inputs, level 2 | Agency mortgage-backed | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	19,100	17,138
Fair value, measurements, recurring | Fair value, inputs, level 2 | Agency mortgage-backed | Commercial loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,351	3
Fair value, measurements, recurring | Fair value, inputs, level 2 | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,934	2,686
Fair value, measurements, recurring | Fair value, inputs, level 2 | Mortgage-backed commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	713	714
Fair value, measurements, recurring | Fair value, inputs, level 2 | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	477	723
Fair value, measurements, recurring | Fair value, inputs, level 2 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,348	1,241
Fair value, measurements, recurring | Fair value, inputs, level 2 | Loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value	0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Retained interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained interest, fair value	0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	57	37
Fair value, measurements, recurring | Fair value, inputs, level 2 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		4
Fair value, measurements, recurring | Fair value, inputs, level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Derivative assets	2	0
Assets, fair value	36	19
Derivative liabilities	0	0
Liabilities, fair value	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Other contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	9	7
Fair value, measurements, recurring | Fair value, inputs, level 3 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | US States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Agency mortgage-backed | Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Agency mortgage-backed | Commercial loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Mortgage-backed commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, fair value	22	8
Fair value, measurements, recurring | Fair value, inputs, level 3 | Retained interest
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained interest, fair value	3	4
Fair value, measurements, recurring | Fair value, inputs, level 3 | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 2	0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		$ 0

Fair Value (Fair Value Measur_2

Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	$ 32	$ 25	$ 19	$ 38
Fair value, measurement, recurring, asset, gain (loss) included in earnings	5	1	12	(2)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	156	73	246	132
Fair value, measurement, recurring, asset, sales	(152)	(68)	(236)	(134)
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	(5)	(1)	(5)	(4)
Fair value, measurement, recurring, asset value, ending balance	36	30	36	30
Fair value, assets, recurring, net unrealized gains (losses)	2	0	8	(5)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0		0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	11	12	7	19
Fair value, measurement, recurring, asset, gain (loss) included in earnings	2	0	6	(4)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	0	0	0
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	(4)	0	(4)	(3)
Fair value, measurement, recurring, asset value, ending balance	9	12	9	12
Fair value, assets, recurring, net unrealized gains (losses)	2	0	6	(5)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0		0
Loans held-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	15	7	8	13
Fair value, measurement, recurring, asset, gain (loss) included in earnings	3	1	4	2
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	156	73	246	132
Fair value, measurement, recurring, asset, sales	(152)	(68)	(236)	(134)
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	22	13	22	13
Fair value, assets, recurring, net unrealized gains (losses)	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0		0
Retained interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	4	5	4	5
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0	0	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	0	0	0
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	(1)	(1)	(1)	(1)
Fair value, measurement, recurring, asset value, ending balance	3	4	3	4
Fair value, assets, recurring, net unrealized gains (losses)	0	0	0	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0		0
Derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	2	1	0	1
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0	0	2	0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	0	0	0	0
Fair value, measurement, recurring, asset, sales	0	0	0	0
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, measurement, recurring, asset value, ending balance	2	1	2	1
Fair value, assets, recurring, net unrealized gains (losses)	0	$ 0	2	$ 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	$ 0		$ 0

Fair Value (Fair Value Measur_3

Fair Value (Fair Value Measurements - Nonrecurring Basis) (Details) $ in Millions	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	$ 275	$ 314
Automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		210
Lower of cost or fair value or valuation reserve allowance		(2)
Automotive | Valuation technique, market approach | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		104
Automotive | Valuation technique, discounted cash flow | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		$ 106
Automotive | Minimum | Valuation technique, discounted cash flow | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		0.0008
Automotive | Maximum | Valuation technique, discounted cash flow | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		0.0109
Automotive | Weighted average | Valuation technique, discounted cash flow | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		0.0072
Loans held-for-sale, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		$ 96
Lower of cost or fair value or valuation reserve allowance		0
Loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	253	306
Lower of cost or fair value or valuation reserve allowance	0	(2)
Commercial finance receivables and loans, automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	54	84
Lower of cost or fair value or valuation reserve allowance	(19)	(10)
Commercial finance receivables and loans, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	17	55
Lower of cost or fair value or valuation reserve allowance	(30)	(46)
Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	71	139
Lower of cost or fair value or valuation reserve allowance	(49)	(56)
Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	13	13
Lower of cost or fair value or valuation reserve allowance	(1)	(1)
Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	9	1
Lower of cost or fair value or valuation reserve allowance	(1)	(1)
Equity method investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	3	3
Lower of cost or fair value or valuation reserve allowance	(4)	0
Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	349	462
Lower of cost or fair value or valuation reserve allowance	(55)	(60)
Fair value, inputs, level 1 | Automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		0
Fair value, inputs, level 1 | Loans held-for-sale, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		0
Fair value, inputs, level 1 | Loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	0	0
Fair value, inputs, level 1 | Commercial finance receivables and loans, automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	0	0
Fair value, inputs, level 1 | Commercial finance receivables and loans, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	0	0
Fair value, inputs, level 1 | Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	0	0
Fair value, inputs, level 1 | Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	0	0
Fair value, inputs, level 1 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	0	0
Fair value, inputs, level 1 | Equity method investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	0	0
Fair value, inputs, level 1 | Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Fair value, inputs, level 2 | Automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		0
Fair value, inputs, level 2 | Loans held-for-sale, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		0
Fair value, inputs, level 2 | Loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	0	0
Fair value, inputs, level 2 | Commercial finance receivables and loans, automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	0	0
Fair value, inputs, level 2 | Commercial finance receivables and loans, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	0	0
Fair value, inputs, level 2 | Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	0	0
Fair value, inputs, level 2 | Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	0	0
Fair value, inputs, level 2 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	0	0
Fair value, inputs, level 2 | Equity method investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	0	0
Fair value, inputs, level 2 | Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Fair value, inputs, level 3 | Automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		210
Fair value, inputs, level 3 | Loans held-for-sale, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net		96
Fair value, inputs, level 3 | Loans held-for-sale | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	253	306
Fair value, inputs, level 3 | Commercial finance receivables and loans, automotive | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	54	84
Fair value, inputs, level 3 | Commercial finance receivables and loans, other | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	17	55
Fair value, inputs, level 3 | Commercial | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial finance receivables and loans, net, fair value	71	139
Fair value, inputs, level 3 | Repossessed and foreclosed assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	13	13
Fair value, inputs, level 3 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	9	1
Fair value, inputs, level 3 | Equity method investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, fair value	3	3
Fair value, inputs, level 3 | Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	$ 349	$ 462

Fair Value (Fair Value of Finan

Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	$ 2,461	$ 2,362
Loans held-for-sale, net	275	314
Finance receivables and loans, net	127,928	128,684
Deposit liabilities	116,325	106,178
Short-term borrowings	6,519	9,987
Long-term debt	37,466	44,193
Estimate of fair value measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	2,499	2,307
Loans held-for-sale, net	253	306
Finance receivables and loans, net	131,383	130,878
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	1,226	1,351
Deposit liabilities	56,575	51,997
Short-term borrowings	6,523	9,992
Long-term debt	40,175	45,646
Estimate of fair value measurement | Fair value, inputs, level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	0	0
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	0	0
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Estimate of fair value measurement | Fair value, inputs, level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	2,499	2,307
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	1,226	1,351
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	23,441	23,846
Estimate of fair value measurement | Fair value, inputs, level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	0	0
Loans held-for-sale, net	253	306
Finance receivables and loans, net	131,383	130,878
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	0	0
Deposit liabilities	56,575	51,997
Short-term borrowings	6,523	9,992
Long-term debt	16,734	21,800
Reported value measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	2,461	2,362
Loans held-for-sale, net	253	306
Finance receivables and loans, net	127,928	128,684
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	1,226	1,351
Deposit liabilities	56,084	51,985
Short-term borrowings	6,519	9,987
Long-term debt	$ 37,466	$ 44,193

Offsetting Assets and Liabili_3

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Offsetting [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 57	$ 41
Derivative Asset, Fair Value, Gross Liability	0	0
Net amounts of assets presented on the Condensed Consolidated Balance Sheet	57	41
Derivative Asset, Financial Instruments Not Offset	(2)	0
Derivative, Collateral, Obligation to Return Cash	(54)	(4)
Derivative Assets in Net Asset Position	1	37
Derivative Assets With No Offsetting Arrangements	2
No amount offset on Balance Sheet	0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	59	41
Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement Not Offset Against Collateral	59	41
Derivative Asset	3	37
Derivative Liability, Fair Value, Gross Liability	2	37
Derivative Liability, Gross Amount Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented on the Condensed Consolidated Balance Sheet	2	37
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	0	0
Derivative Liabilities, Collateral Amounts Not Offset	(1)	0
Derivative Liability	1	37
Derivative Liability, Net Asset Position	2
Derivative Liability in Net Asset Position, Gross Amounts Offset	0
Derivative Liability in Net Asset Position, Gross Amounts Not Offset on Balance Sheet, Financial Instruments	(2)
Derivative Liability in Net Asset Position, Gross Amounts Not Offset on Balance Sheet, Collateral	0
Derivative Liability, Net Asset Position, Net Amount	0
Fair value of derivative contracts in payable position	4	37
Derivative Liabilities, Financial Instruments Not Offset	(2)	0
Securities Sold under Agreements to Repurchase, Gross Amounts Recognized	432	685
Securities Sold under Agreements to Repurchase, Gross Amounts Offset	0	0
Securities Sold under Agreements to Repurchase, Net Amounts Presented	432	685
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(432)	(685)
Securities Sold Under Agreements to Repurchase, Net Amount	0	0
Total liabilities, gross amounts recognized	436	722
Total liabilities, net amounts presented on the balance sheet	436	722
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash	(433)	(685)
Securities Purchased under Agreements to Resell, Fair Value of Collateral	1	4
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value	33	7
Derivative Asset, Fair Value of Collateral	$ 32	$ 3

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of operating segments			4
Net financing revenue and other interest income	$ 1,157	$ 1,094	$ 2,289	$ 2,143
Other revenue	395	364	861	718
Total net revenue	1,552	1,458	3,150	2,861
Provision for loan losses	177	158	459	419
Noninterest expense	881	839	1,711	1,653
Income from continuing operations before income tax expense	494	461	980	789
Assets	180,448	171,345	180,448	171,345	$ 178,869
Net financing revenue and other interest income after provision for loan losses	980	936	1,800	1,700
Operating Segments | Automotive Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	1,022	925	2,002	1,834
Other revenue	61	63	129	129
Total net revenue	1,083	988	2,131	1,963
Provision for loan losses	180	170	442	429
Noninterest expense	444	436	901	884
Income from continuing operations before income tax expense	459	382	788	650
Assets	114,955	114,915	114,955	114,915
Operating Segments | Insurance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	15	13	27	25
Other revenue	286	266	646	512
Total net revenue	301	279	673	537
Provision for loan losses	0	0	0	0
Noninterest expense	301	268	528	499
Income from continuing operations before income tax expense	0	11	145	38
Assets	8,241	7,634	8,241	7,634
Operating Segments | Mortgage Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	46	44	96	87
Other revenue	4	2	6	3
Total net revenue	50	46	102	90
Provision for loan losses	0	0	2	2
Noninterest expense	36	32	73	66
Income from continuing operations before income tax expense	14	14	27	22
Assets	16,584	13,385	16,584	13,385
Operating Segments | Corporate Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	61	57	115	103
Other revenue	10	14	21	22
Total net revenue	71	71	136	125
Provision for loan losses	3	(6)	26	(6)
Noninterest expense	22	19	51	44
Income from continuing operations before income tax expense	46	58	59	87
Assets	4,980	4,458	4,980	4,458
Corporate and Other
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	13	55	49	94
Other revenue	34	19	59	52
Total net revenue	47	74	108	146
Provision for loan losses	(6)	(6)	(11)	(6)
Noninterest expense	78	84	158	160
Income from continuing operations before income tax expense	(25)	(4)	(39)	(8)
Assets	$ 35,688	$ 30,953	$ 35,688	$ 30,953

Parent and Guarantor Condense_3

Parent and Guarantor Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	$ 1,860	$ 1,647	$ 3,667	$ 3,190
Interest on loans held-for-sale	3	6	5	6
Interest and dividends on investment securities and other earning assets	244	188	484	364
Interest on cash and cash equivalents	21	17	44	32
Operating leases	363	374	724	756
Financing revenue and other interest income	2,491	2,232	4,924	4,348
Interest on deposits	651	399	1,243	750
Interest on short-term borrowings	37	40	81	72
Interest on long-term debt	407	434	826	845
Interest on intercompany debt	0	0	0	0
Interest expense	1,095	873	2,150	1,667
Net depreciation expense on operating lease assets	239	265	485	538
Net financing (loss) revenue	1,157	1,094	2,289	2,143
Cash dividends from bank subsidiaries	0	0	0	0
Cash dividends from nonbank subsidiaries	0	0	0	0
Insurance premiums and service revenue earned	261	239	522	495
Gain on mortgage and automotive loans, net	2	1	12	2
Other gain (loss) on investments, net	39	27	147	15
Other income, net of losses	93	97	180	206
Total other revenue	395	364	861	718
Net revenue	1,552	1,458	3,150	2,861
Provision for loan losses	177	158	459	419
Compensation and benefits expense	296	292	614	598
Insurance losses and loss adjustment expenses	127	101	186	164
Other operating expenses	458	446	911	891
Total noninterest expense	881	839	1,711	1,653
Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries	494	461	980	789
Income tax (benefit) expense from continuing operations	(90)	113	21	189
Net income from continuing operations	584	348	959	600
Income (loss) from discontinued operations, net of tax	(2)	1	(3)	(1)
Undistributed income of bank subsidiary	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income	582	349	956	599
Other comprehensive income (loss), net of tax	309	(70)	615	(398)
Comprehensive income	891	279	1,571	201
Affiliated entity
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Gain on mortgage and automotive loans, net			0	0
Consolidating adjustments
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(3)	0	(3)	0
Interest on loans held-for-sale	0	0	0	0
Interest and dividends on investment securities and other earning assets	0	0	0	(1)
Interest on cash and cash equivalents	0	1	0	0
Operating leases	0	0	0	0
Financing revenue and other interest income	(15)	(8)	(25)	(17)
Interest on deposits	0	4	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	0	0	0
Interest on intercompany debt	(12)	(12)	(22)	(17)
Interest expense	(12)	(8)	(22)	(17)
Net depreciation expense on operating lease assets	0	0	0	0
Net financing (loss) revenue	(3)	0	(3)	0
Cash dividends from bank subsidiaries	(1,000)	(1,000)	(1,800)	(3,000)
Cash dividends from nonbank subsidiaries	(94)	(132)	(136)	(301)
Insurance premiums and service revenue earned	0	0	0	0
Gain on mortgage and automotive loans, net	0	0	0	(28)
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	(143)	(188)	(303)	(396)
Total other revenue	(143)	(188)	(303)	(424)
Net revenue	(1,240)	(1,320)	(2,242)	(3,725)
Provision for loan losses	(1)	0	(18)	(28)
Compensation and benefits expense	0	0	0	0
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	(143)	(188)	(303)	(396)
Total noninterest expense	(143)	(188)	(303)	(396)
Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries	(1,096)	(1,132)	(1,921)	(3,301)
Income tax (benefit) expense from continuing operations	0	0	0	0
Net income from continuing operations	(1,096)	(1,132)	(1,921)	(3,301)
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiary	(220)	(104)	(334)	1,090
Undistributed income of nonbank subsidiaries	43	6	(140)	(35)
Net income	(1,273)	(1,230)	(2,395)	(2,246)
Other comprehensive income (loss), net of tax	(548)	130	(1,097)	745
Comprehensive income	(1,821)	(1,100)	(3,492)	(1,501)
Consolidating adjustments | Affiliated entity
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(4)	(5)	(9)	(8)
Interest on cash and cash equivalents	(8)	(4)	(13)	(8)
Gain on mortgage and automotive loans, net			(507)	(78)
Parent
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	(60)	(1)	(120)	10
Interest on loans held-for-sale	0	0	0	0
Interest and dividends on investment securities and other earning assets	0	0	0	0
Interest on cash and cash equivalents	4	2	6	4
Operating leases	(1)	1	1	3
Financing revenue and other interest income	(51)	8	(102)	27
Interest on deposits	0	0	0	0
Interest on short-term borrowings	13	10	26	20
Interest on long-term debt	212	257	423	515
Interest on intercompany debt	6	4	11	7
Interest expense	231	271	460	542
Net depreciation expense on operating lease assets	1	1	2	5
Net financing (loss) revenue	(283)	(264)	(564)	(520)
Cash dividends from bank subsidiaries	500	500	900	1,500
Cash dividends from nonbank subsidiaries	94	132	136	301
Insurance premiums and service revenue earned	0	0	0	0
Gain on mortgage and automotive loans, net	(1)	0	3	28
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	91	100	194	196
Total other revenue	90	100	197	224
Net revenue	401	468	669	1,505
Provision for loan losses	5	32	32	113
Compensation and benefits expense	9	25	21	48
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	159	173	314	355
Total noninterest expense	168	198	335	403
Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries	228	238	302	989
Income tax (benefit) expense from continuing operations	(289)	(66)	(350)	(122)
Net income from continuing operations	517	304	652	1,111
Income (loss) from discontinued operations, net of tax	(2)	(1)	(3)	(2)
Undistributed income of bank subsidiary	110	52	167	(545)
Undistributed income of nonbank subsidiaries	(43)	(6)	140	35
Net income	582	349	956	599
Other comprehensive income (loss), net of tax	309	(70)	615	(398)
Comprehensive income	891	279	1,571	201
Parent | Affiliated entity
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	3	4	6	6
Interest on cash and cash equivalents	3	2	5	4
Gain on mortgage and automotive loans, net			216	83
Guarantors
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on loans held-for-sale	0	0	0	0
Interest and dividends on investment securities and other earning assets	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Operating leases	0	0	0	0
Financing revenue and other interest income	0	0	0	0
Interest on deposits	0	0	0	0
Interest on short-term borrowings	0	0	0	0
Interest on long-term debt	0	0	0	0
Interest on intercompany debt	0	0	0	0
Interest expense	0	0	0	0
Net depreciation expense on operating lease assets	0	0	0	0
Net financing (loss) revenue	0	0	0	0
Cash dividends from bank subsidiaries	500	500	900	1,500
Cash dividends from nonbank subsidiaries	0	0	0	0
Insurance premiums and service revenue earned	0	0	0	0
Gain on mortgage and automotive loans, net	0	0	0	0
Other gain (loss) on investments, net	0	0	0	0
Other income, net of losses	0	0	0	0
Total other revenue	0	0	0	0
Net revenue	500	500	900	1,500
Provision for loan losses	0	0	0	0
Compensation and benefits expense	0	0	0	0
Insurance losses and loss adjustment expenses	0	0	0	0
Other operating expenses	0	0	0	0
Total noninterest expense	0	0	0	0
Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries	500	500	900	1,500
Income tax (benefit) expense from continuing operations	0	0	0	0
Net income from continuing operations	500	500	900	1,500
Income (loss) from discontinued operations, net of tax	0	0	0	0
Undistributed income of bank subsidiary	110	52	167	(545)
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income	610	552	1,067	955
Other comprehensive income (loss), net of tax	237	(56)	466	(332)
Comprehensive income	847	496	1,533	623
Guarantors | Affiliated entity
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	0	0	0	0
Interest on cash and cash equivalents	0	0	0	0
Gain on mortgage and automotive loans, net			0	0
Nonguarantors
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1,923	1,648	3,790	3,180
Interest on loans held-for-sale	3	6	5	6
Interest and dividends on investment securities and other earning assets	244	188	484	365
Interest on cash and cash equivalents	17	14	38	28
Operating leases	364	373	723	753
Financing revenue and other interest income	2,557	2,232	5,051	4,338
Interest on deposits	651	395	1,243	750
Interest on short-term borrowings	24	30	55	52
Interest on long-term debt	195	177	403	330
Interest on intercompany debt	6	8	11	10
Interest expense	876	610	1,712	1,142
Net depreciation expense on operating lease assets	238	264	483	533
Net financing (loss) revenue	1,443	1,358	2,856	2,663
Cash dividends from bank subsidiaries	0	0	0	0
Cash dividends from nonbank subsidiaries	0	0	0	0
Insurance premiums and service revenue earned	261	239	522	495
Gain on mortgage and automotive loans, net	3	1	9	2
Other gain (loss) on investments, net	39	27	147	15
Other income, net of losses	145	185	289	406
Total other revenue	448	452	967	918
Net revenue	1,891	1,810	3,823	3,581
Provision for loan losses	173	126	445	334
Compensation and benefits expense	287	267	593	550
Insurance losses and loss adjustment expenses	127	101	186	164
Other operating expenses	442	461	900	932
Total noninterest expense	856	829	1,679	1,646
Income from continuing operations before income tax (benefit) expense and undistributed (loss) income of subsidiaries	862	855	1,699	1,601
Income tax (benefit) expense from continuing operations	199	179	371	311
Net income from continuing operations	663	676	1,328	1,290
Income (loss) from discontinued operations, net of tax	0	2	0	1
Undistributed income of bank subsidiary	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net income	663	678	1,328	1,291
Other comprehensive income (loss), net of tax	311	(74)	631	(413)
Comprehensive income	974	604	1,959	878
Nonguarantors | Affiliated entity
Condensed Income Statements, Captions [Line Items]
Interest and fees on finance receivables and loans	1	1	3	2
Interest on cash and cash equivalents	$ 5	$ 2	8	4
Gain on mortgage and automotive loans, net			$ 291	$ (5)

Parent and Guarantor Condense_4

Parent and Guarantor Condensed Consolidating Financial Statements (Schedule of Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, noninterest-bearing	$ 659			$ 810
Cash and cash equivalents, interest-bearing	2,904			3,727
Cash and cash equivalents	3,563			4,537	$ 3,924
Equity securities	591			773
Available-for-sale securities	28,688			25,303
Held-to-maturity securities	2,461			2,362
Loans held-for-sale, net	275			314
Finance receivables and loans, net	129,210			129,926	125,544
Intercompany loans to nonbank subsidiary	0			0
Allowance for loan losses	(1,282)			(1,242)
Total finance receivables and loans, net	127,928			128,684
Net Investment in Lease	8,407			8,417
Intercompany receivables from bank subsidiary	0			0
Intercompany receivables from nonbank subsidiary	0			0
Investment in bank subsidiaries	0			0
Investment in nonbank subsidiaries	0			0
Premiums receivable and other insurance assets	2,460			2,326
Other assets	6,075			6,153
Assets	180,448			178,869	171,345
Deposit liabilities, noninterest-bearing	162			142
Deposit liabilities, interest-bearing	116,163			106,036
Deposit liabilities	116,325			106,178
Short-term borrowings	6,519			9,987
Long-term debt	37,466			44,193
Intercompany debt payable to bank subsidiaries	0			0
Intercompany debt payable to nonbank subsidiaries	0			0
Intercompany payables to bank subsidiary	0			0
Intercompany payables to nonbank subsidiaries	0			0
Interest payable	744			523
Unearned insurance premiums and service revenue	3,171			3,044
Accrued Liabilities and Other Liabilities	1,907			1,676
Total liabilities	166,132			165,601
Equity	14,316	$ 13,699	$ 13,266	13,268	13,139	$ 13,082	$ 13,375	$ 13,494
Total liabilities and equity	180,448			178,869
Affiliated entity
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, interest-bearing	0			0
Deposit liabilities, interest-bearing	0			0
Consolidating adjustments
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, noninterest-bearing	0			0
Cash and cash equivalents, interest-bearing	0			0
Cash and cash equivalents	(1,987)			(1,770)	(1,585)
Equity securities	0			0
Available-for-sale securities	0			0
Held-to-maturity securities	(14)			(20)
Loans held-for-sale, net	0			0
Finance receivables and loans, net	14			0
Intercompany loans to nonbank subsidiary	(765)			(1,279)
Allowance for loan losses	0			0
Total finance receivables and loans, net	(751)			(1,279)
Net Investment in Lease	0			0
Intercompany receivables from bank subsidiary	(105)			(158)
Intercompany receivables from nonbank subsidiary	(155)			(174)
Investment in bank subsidiaries	(33,730)			(32,426)
Investment in nonbank subsidiaries	(7,096)			(6,928)
Premiums receivable and other insurance assets	0			0
Other assets	(1,739)			(1,526)
Assets	(45,577)			(44,281)
Deposit liabilities, noninterest-bearing	0			0
Deposit liabilities, interest-bearing	0			0
Deposit liabilities	(1,242)			(1,249)
Short-term borrowings	0			0
Long-term debt	0			0
Intercompany debt payable to bank subsidiaries	(14)			(20)
Intercompany debt payable to nonbank subsidiaries	(1,510)			(1,800)
Intercompany payables to bank subsidiary	(51)			(45)
Intercompany payables to nonbank subsidiaries	(215)			(253)
Interest payable	0			0
Unearned insurance premiums and service revenue	0			0
Accrued Liabilities and Other Liabilities	(1,734)			(1,560)
Total liabilities	(4,766)			(4,927)
Equity	(40,811)			(39,354)
Total liabilities and equity	(45,577)			(44,281)
Consolidating adjustments | Affiliated entity
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, interest-bearing	(1,987)			(1,770)
Deposit liabilities, interest-bearing	(1,242)			(1,249)
Parent
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, noninterest-bearing	44			55
Cash and cash equivalents, interest-bearing	6			5
Cash and cash equivalents	1,292			1,309	1,071
Equity securities	0			0
Available-for-sale securities	0			0
Held-to-maturity securities	0			0
Loans held-for-sale, net	0			0
Finance receivables and loans, net	2,292			2,349
Intercompany loans to nonbank subsidiary	663			882
Allowance for loan losses	(34)			(55)
Total finance receivables and loans, net	2,921			3,176
Net Investment in Lease	2			5
Intercompany receivables from bank subsidiary	105			158
Intercompany receivables from nonbank subsidiary	40			45
Investment in bank subsidiaries	16,865			16,213
Investment in nonbank subsidiaries	7,096			6,928
Premiums receivable and other insurance assets	0			0
Other assets	2,339			2,226
Assets	30,660			30,060
Deposit liabilities, noninterest-bearing	0			0
Deposit liabilities, interest-bearing	1			1
Deposit liabilities	1			1
Short-term borrowings	2,462			2,477
Long-term debt	12,447			12,774
Intercompany debt payable to bank subsidiaries	14			20
Intercompany debt payable to nonbank subsidiaries	847			918
Intercompany payables to bank subsidiary	51			45
Intercompany payables to nonbank subsidiaries	108			124
Interest payable	150			159
Unearned insurance premiums and service revenue	0			0
Accrued Liabilities and Other Liabilities	264			274
Total liabilities	16,344			16,792
Equity	14,316			13,268
Total liabilities and equity	30,660			30,060
Parent | Affiliated entity
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, interest-bearing	1,242			1,249
Deposit liabilities, interest-bearing	0			0
Guarantors
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, noninterest-bearing	0			0
Cash and cash equivalents, interest-bearing	0			0
Cash and cash equivalents	0			0	0
Equity securities	0			0
Available-for-sale securities	0			0
Held-to-maturity securities	0			0
Loans held-for-sale, net	0			0
Finance receivables and loans, net	0			0
Intercompany loans to nonbank subsidiary	0			0
Allowance for loan losses	0			0
Total finance receivables and loans, net	0			0
Net Investment in Lease	0			0
Intercompany receivables from bank subsidiary	0			0
Intercompany receivables from nonbank subsidiary	0			0
Investment in bank subsidiaries	16,865			16,213
Investment in nonbank subsidiaries	0			0
Premiums receivable and other insurance assets	0			0
Other assets	0			0
Assets	16,865			16,213
Deposit liabilities, noninterest-bearing	0			0
Deposit liabilities, interest-bearing	0			0
Deposit liabilities	0			0
Short-term borrowings	0			0
Long-term debt	0			0
Intercompany debt payable to bank subsidiaries	0			0
Intercompany debt payable to nonbank subsidiaries	0			0
Intercompany payables to bank subsidiary	0			0
Intercompany payables to nonbank subsidiaries	0			0
Interest payable	0			0
Unearned insurance premiums and service revenue	0			0
Accrued Liabilities and Other Liabilities	0			0
Total liabilities	0			0
Equity	16,865			16,213
Total liabilities and equity	16,865			16,213
Guarantors | Affiliated entity
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, interest-bearing	0			0
Deposit liabilities, interest-bearing	0			0
Nonguarantors
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, noninterest-bearing	615			755
Cash and cash equivalents, interest-bearing	2,898			3,722
Cash and cash equivalents	4,258			4,998	$ 4,438
Equity securities	591			773
Available-for-sale securities	28,688			25,303
Held-to-maturity securities	2,475			2,382
Loans held-for-sale, net	275			314
Finance receivables and loans, net	126,904			127,577
Intercompany loans to nonbank subsidiary	102			397
Allowance for loan losses	(1,248)			(1,187)
Total finance receivables and loans, net	125,758			126,787
Net Investment in Lease	8,405			8,412
Intercompany receivables from bank subsidiary	0			0
Intercompany receivables from nonbank subsidiary	115			129
Investment in bank subsidiaries	0			0
Investment in nonbank subsidiaries	0			0
Premiums receivable and other insurance assets	2,460			2,326
Other assets	5,475			5,453
Assets	178,500			176,877
Deposit liabilities, noninterest-bearing	162			142
Deposit liabilities, interest-bearing	116,162			106,035
Deposit liabilities	117,566			107,426
Short-term borrowings	4,057			7,510
Long-term debt	25,019			31,419
Intercompany debt payable to bank subsidiaries	0			0
Intercompany debt payable to nonbank subsidiaries	663			882
Intercompany payables to bank subsidiary	0			0
Intercompany payables to nonbank subsidiaries	107			129
Interest payable	594			364
Unearned insurance premiums and service revenue	3,171			3,044
Accrued Liabilities and Other Liabilities	3,377			2,962
Total liabilities	154,554			153,736
Equity	23,946			23,141
Total liabilities and equity	178,500			176,877
Nonguarantors | Affiliated entity
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents, interest-bearing	745			521
Deposit liabilities, interest-bearing	$ 1,242			$ 1,249

Parent and Guarantor Condense_5

Parent and Guarantor Condensed Consolidating Financial Statements (Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities			$ 1,844	$ 2,009
Purchases of equity securities			(210)	(500)
Proceeds from sales of equity securities			511	535
Payments to Acquire Debt Securities, Available-for-sale			(7,018)	(4,094)
Proceeds from sales of available-for-sale securities			2,568	390
Proceeds from repayments of available-for-sale securities			1,805	1,621
Purchases of held-to-maturity securities			(268)	(316)
Proceeds from repayments of held-to-maturity securities			107	72
Purchases of finance receivables and loans held-for-investment			(2,386)	(2,611)
Proceeds from sales of finance receivables and loans initially held-for-investment			159	0
Originations and repayments of finance receivables and loans held-for-investment and other, net			2,769	(638)
Net change in intercompany loans	$ 2	$ 1	12	2
Purchases of operating lease assets			(1,769)	(2,107)
Disposals of operating lease assets			1,321	1,763
Capital contributions to subsidiaries			0	0
Returns of contributed capital			0	0
Net change in nonmarketable equity investments			113	(46)
Payments for (proceeds from) other, net			(209)	(186)
Net cash provided by investing activities			(2,507)	(6,117)
Net change in short-term borrowings			(3,468)	(4,305)
Net (decrease) increase in deposits			10,133	5,441
Proceeds from issuance of long-term debt			4,590	12,940
Repayments of long-term debt			(11,372)	(9,800)
Repurchase of common stock			(440)	(380)
Dividends paid			(139)	(115)
Capital contributions from parent			0	0
Net cash provided by (used in) financing activities			(696)	3,781
Effect of exchange-rate changes on cash and cash equivalents and restricted cash			3	(3)
Net decrease in cash and cash equivalents and restricted cash			(1,356)	(330)
Cash and cash equivalents and restricted cash			5,626	5,269
Cash and cash equivalents and restricted cash	4,270	4,939	4,270	4,939
Cash and cash equivalents	3,563	3,924	3,563	3,924	$ 4,537
Restricted Cash	707	1,015	707	1,015
Affiliated entity
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net change in intercompany investment securities			0	0
Net change in intercompany loans			0	0
Net Change in Debt, Intercompany			0	0
Dividends paid and returns of contributed capital, intercompany			0	0
Consolidating adjustments
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities			(1,938)	(3,302)
Purchases of equity securities			0	0
Proceeds from sales of equity securities			0	0
Payments to Acquire Debt Securities, Available-for-sale			0	0
Proceeds from sales of available-for-sale securities			0	0
Proceeds from repayments of available-for-sale securities			0	0
Purchases of held-to-maturity securities			0	0
Proceeds from repayments of held-to-maturity securities			0	0
Purchases of finance receivables and loans held-for-investment			464	820
Proceeds from sales of finance receivables and loans initially held-for-investment			(464)	(820)
Originations and repayments of finance receivables and loans held-for-investment and other, net			3	0
Net change in intercompany loans	0	0	0	(28)
Purchases of operating lease assets			0	0
Disposals of operating lease assets			0	0
Capital contributions to subsidiaries			1	63
Returns of contributed capital			(26)	(194)
Net change in nonmarketable equity investments			0	0
Payments for (proceeds from) other, net			(1)	0
Net cash provided by investing activities			(536)	(226)
Net change in short-term borrowings			0	0
Net (decrease) increase in deposits			7	123
Proceeds from issuance of long-term debt			0	0
Repayments of long-term debt			0	0
Repurchase of common stock			0	0
Dividends paid			0	0
Capital contributions from parent			(1)	(63)
Net cash provided by (used in) financing activities			2,257	3,776
Effect of exchange-rate changes on cash and cash equivalents and restricted cash			0	0
Net decrease in cash and cash equivalents and restricted cash			(217)	248
Cash and cash equivalents and restricted cash			(1,770)	(1,833)
Cash and cash equivalents and restricted cash	(1,987)	(1,585)	(1,987)	(1,585)
Cash and cash equivalents	(1,987)	(1,585)	(1,987)	(1,585)	(1,770)
Restricted Cash	0	0	0	0
Consolidating adjustments | Affiliated entity
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net change in intercompany investment securities			(6)	(17)
Net change in intercompany loans			(507)	(78)
Net Change in Debt, Intercompany			290	221
Dividends paid and returns of contributed capital, intercompany			1,961	3,495
Parent
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities			693	958
Purchases of equity securities			0	0
Proceeds from sales of equity securities			0	0
Payments to Acquire Debt Securities, Available-for-sale			0	0
Proceeds from sales of available-for-sale securities			0	0
Proceeds from repayments of available-for-sale securities			0	0
Purchases of held-to-maturity securities			0	0
Proceeds from repayments of held-to-maturity securities			0	0
Purchases of finance receivables and loans held-for-investment			0	0
Proceeds from sales of finance receivables and loans initially held-for-investment			476	820
Originations and repayments of finance receivables and loans held-for-investment and other, net			(407)	1,331
Net change in intercompany loans	(1)	0	3	28
Purchases of operating lease assets			0	0
Disposals of operating lease assets			2	6
Capital contributions to subsidiaries			(1)	(57)
Returns of contributed capital			26	194
Net change in nonmarketable equity investments			(11)	0
Payments for (proceeds from) other, net			0	(3)
Net cash provided by investing activities			301	2,374
Net change in short-term borrowings			(15)	(505)
Net (decrease) increase in deposits			0	(6)
Proceeds from issuance of long-term debt			756	32
Repayments of long-term debt			(1,116)	(2,412)
Repurchase of common stock			(440)	(380)
Dividends paid			(139)	(115)
Capital contributions from parent			0	0
Net cash provided by (used in) financing activities			(1,028)	(3,524)
Effect of exchange-rate changes on cash and cash equivalents and restricted cash			0	0
Net decrease in cash and cash equivalents and restricted cash			(34)	(192)
Cash and cash equivalents and restricted cash			1,398	1,395
Cash and cash equivalents and restricted cash	1,364	1,203	1,364	1,203
Cash and cash equivalents	1,292	1,071	1,292	1,071	1,309
Restricted Cash	72	132	72	132
Parent | Affiliated entity
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net change in intercompany investment securities			0	0
Net change in intercompany loans			216	83
Net Change in Debt, Intercompany			(74)	(138)
Dividends paid and returns of contributed capital, intercompany			0	0
Guarantors
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities			900	1,500
Purchases of equity securities			0	0
Proceeds from sales of equity securities			0	0
Payments to Acquire Debt Securities, Available-for-sale			0	0
Proceeds from sales of available-for-sale securities			0	0
Proceeds from repayments of available-for-sale securities			0	0
Purchases of held-to-maturity securities			0	0
Proceeds from repayments of held-to-maturity securities			0	0
Purchases of finance receivables and loans held-for-investment			0	0
Proceeds from sales of finance receivables and loans initially held-for-investment			0	0
Originations and repayments of finance receivables and loans held-for-investment and other, net			0	0
Net change in intercompany loans	0	0	0	0
Purchases of operating lease assets			0	0
Disposals of operating lease assets			0	0
Capital contributions to subsidiaries			0	(6)
Returns of contributed capital			0	0
Net change in nonmarketable equity investments			0	0
Payments for (proceeds from) other, net			0	0
Net cash provided by investing activities			0	(6)
Net change in short-term borrowings			0	0
Net (decrease) increase in deposits			0	0
Proceeds from issuance of long-term debt			0	0
Repayments of long-term debt			0	0
Repurchase of common stock			0	0
Dividends paid			0	0
Capital contributions from parent			0	6
Net cash provided by (used in) financing activities			(900)	(1,494)
Effect of exchange-rate changes on cash and cash equivalents and restricted cash			0	0
Net decrease in cash and cash equivalents and restricted cash			0	0
Cash and cash equivalents and restricted cash			0	0
Cash and cash equivalents and restricted cash	0	0	0	0
Cash and cash equivalents	0	0	0	0	0
Restricted Cash	0	0	0	0
Guarantors | Affiliated entity
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net change in intercompany investment securities			0	0
Net change in intercompany loans			0	0
Net Change in Debt, Intercompany			0	0
Dividends paid and returns of contributed capital, intercompany			(900)	(1,500)
Nonguarantors
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net cash provided by (used in) operating activities			2,189	2,853
Purchases of equity securities			(210)	(500)
Proceeds from sales of equity securities			511	535
Payments to Acquire Debt Securities, Available-for-sale			(7,018)	(4,094)
Proceeds from sales of available-for-sale securities			2,568	390
Proceeds from repayments of available-for-sale securities			1,805	1,621
Purchases of held-to-maturity securities			(268)	(316)
Proceeds from repayments of held-to-maturity securities			107	72
Purchases of finance receivables and loans held-for-investment			(2,850)	(3,431)
Proceeds from sales of finance receivables and loans initially held-for-investment			147	0
Originations and repayments of finance receivables and loans held-for-investment and other, net			3,173	(1,969)
Net change in intercompany loans	3	1	9	2
Purchases of operating lease assets			(1,769)	(2,107)
Disposals of operating lease assets			1,319	1,757
Capital contributions to subsidiaries			0	0
Returns of contributed capital			0	0
Net change in nonmarketable equity investments			124	(46)
Payments for (proceeds from) other, net			(208)	(183)
Net cash provided by investing activities			(2,272)	(8,259)
Net change in short-term borrowings			(3,453)	(3,800)
Net (decrease) increase in deposits			10,126	5,324
Proceeds from issuance of long-term debt			3,834	12,908
Repayments of long-term debt			(10,256)	(7,388)
Repurchase of common stock			0	0
Dividends paid			0	0
Capital contributions from parent			1	57
Net cash provided by (used in) financing activities			(1,025)	5,023
Effect of exchange-rate changes on cash and cash equivalents and restricted cash			3	(3)
Net decrease in cash and cash equivalents and restricted cash			(1,105)	(386)
Cash and cash equivalents and restricted cash			5,998	5,707
Cash and cash equivalents and restricted cash	4,893	5,321	4,893	5,321
Cash and cash equivalents	4,258	4,438	4,258	4,438	$ 4,998
Restricted Cash	$ 635	$ 883	635	883
Nonguarantors | Affiliated entity
Parent and Guarantor Consolidating Statement of Cash Flows [Line Items]
Net change in intercompany investment securities			6	17
Net change in intercompany loans			291	(5)
Net Change in Debt, Intercompany			(216)	(83)
Dividends paid and returns of contributed capital, intercompany			$ (1,061)	$ (1,995)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 16, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Dividends declared, amount per common share		$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.13	$ 0.13
Subsequent event
Subsequent Event [Line Items]
Dividends declared, amount per common share	$ 0.17
Business Combination, Pending Acquisition - Estimated Gross Amount of Consideration to Transfer	$ 190

Uncategorized Items - ally20196

Label	Element	Value
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 21,345,000,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	21,245,000,000
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(531,000,000)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(250,000,000)
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(6,510,000,000)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(5,499,000,000)
Treasury Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(1,110,000,000)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(2,049,000,000)
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	7,000,000
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	27,000,000
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(20,000,000)
Accounting Standards Update 2017-08 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(2,000,000)
Accounting Standards Update 2017-08 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	8,000,000
Accounting Standards Update 2017-08 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(10,000,000)
Accounting Standards Update 2018-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Accounting Standards Update 2018-02 [Member] | AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(42,000,000)
Accounting Standards Update 2018-02 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	42,000,000
Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(126,000,000)
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (126,000,000)