Ally Financial (ALLY) 10-Q 31 Jul 20 2020 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 28, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
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		373,837,123
Entity Central Index Key	0000040729
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
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 Subject to Mandatory Redemption
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

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Revenue and Other Income [Abstract]
Interest and fees on finance receivables and loans	$ 1,630	$ 1,860	$ 3,372	$ 3,667
Interest on loans held-for-sale	4	3	6	5
Interest and dividends on investment securities and other earning assets	197	244	423	484
Interest on cash and cash equivalents	4	21	18	44
Operating leases	343	363	710	724
Total financing revenue and other interest income	2,178	2,491	4,529	4,924
Interest Expense [Abstract]
Interest on deposits	541	651	1,133	1,243
Interest on short-term borrowings	13	37	30	81
Interest on long-term debt	318	407	666	826
Total interest expense	872	1,095	1,829	2,150
Net depreciation expense on operating lease assets	252	239	500	485
Net financing revenue and other interest income	1,054	1,157	2,200	2,289
Other revenue [Abstract]
Insurance premiums and service revenue earned	263	261	540	522
Gain on mortgage and automotive loans, net	14	2	2	12
Other gain on investments, net	188	39	109	147
Other income, net of losses	90	93	170	180
Total other revenue	555	395	821	861
Total net revenue	1,609	1,552	3,021	3,150
Provision for credit losses	287	177	1,190	459
Noninterest Expense [Abstract]
Compensation and benefits expense	334	296	694	614
Insurance losses and loss adjustment expenses	142	127	216	186
Goodwill impairment	50	0	50	0
Other operating expenses	459	458	945	911
Total noninterest expense	985	881	1,905	1,711
Income (loss) from continuing operations before income tax expense (benefit)	337	494	(74)	980
Statement [Abstract]
Income tax expense (benefit) from continuing operations	95	(90)	3	21
Net income (loss) from continuing operations	242	584	(77)	959
Loss from discontinued operations, net of tax	(1)	(2)	(1)	(3)
Net income (loss)	241	582	(78)	956
Other comprehensive income, net of tax	109	309	692	615
Comprehensive Income	$ 350	$ 891	$ 614	$ 1,571
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, basic earnings per common share	$ 0.65	$ 1.47	$ (0.20)	$ 2.39
Loss from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0	0	(0.01)
Net income (loss), basic earnings per common share	0.64	1.46	(0.21)	2.39
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, diluted earnings per common share	0.64	1.46	(0.20)	2.38
Loss from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0	0	(0.01)
Net income (loss), diluted earnings per common share	0.64	1.46	(0.21)	2.37
Cash dividends declared per common share	$ 0.19	$ 0.17	$ 0.38	$ 0.34

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 609	$ 619
Cash and cash equivalents, interest-bearing	18,522	2,936
Total cash and cash equivalents	19,131	3,555
Equity securities	613	616
Available-for-sale securities	29,225	30,284
Held-to-maturity securities	1,390	1,568
Loans held-for-sale, net	404	158
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	118,234	128,231
Allowance for loan losses	3,354	1,263
Total finance receivables and loans, net	114,880	126,968
Investment in operating leases, net	9,088	8,864
Premiums receivable and other insurance assets	2,609	2,558
Other assets	6,721	6,073
Total assets	184,061	180,644
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	134	119
Deposit liabilities, interest-bearing	130,902	120,633
Total deposit liabilities	131,036	120,752
Short-term borrowings	3,689	5,531
Long-term debt	29,176	34,027
Interest payable	697	641
Unearned insurance premiums and service revenue	3,338	3,305
Accrued expenses and other liabilities	2,299	1,972
Total liabilities	170,235	166,228
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital	21,499	21,438
Accumulated deficit	(5,296)	(4,057)
Accumulated other comprehensive income (loss)	815	123
Treasury stock, at cost	(3,192)	(3,088)
Total equity	13,826	14,416
Total liabilities and equity	184,061	180,644
On-balance sheet variable interest entities
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	16,130	18,710
Allowance for loan losses	401	153
Total finance receivables and loans, net	15,729	18,557
Other assets	893	787
Total assets	16,622	19,344
Liabilities and Equity [Abstract]
Long-term debt	6,493	9,087
Accrued expenses and other liabilities	6	11
Total liabilities	$ 6,499	$ 9,098

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheet & Mini Balance Sheet (Paranthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
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	500,353,339	496,957,805
Common stock, shares outstanding	373,837,123	374,331,998
Treasury stock, shares	126,516,216	122,625,807
Held-to-maturity securities, fair value	$ 1,476	$ 1,600

Condensed Consolidated Statemen

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	$ 13,268	$ 21,345	$ (5,489)	$ (539)	$ (2,049)
Common stock dividends, amount per share	$ 0.34
Net income (loss)	$ 956		956
Share-based compensation	58	58
Other comprehensive income	(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 (loss)	$ 582		582
Share-based compensation	24	24
Other comprehensive income	(309)			(309)
Common stock repurchases	(229)				(229)
Common stock dividends	(69)		(69)
Equity	14,316	21,403	(4,682)	84	(2,489)
Equity	$ 14,416	21,438	(4,057)	123	(3,088)
Common stock dividends, amount per share	$ 0.38
Net income (loss)	$ (78)		(78)
Share-based compensation	61	61
Other comprehensive income	(692)			(692)
Common stock repurchases	(104)				(104)
Common stock dividends	(144)		(144)
Equity	$ 13,519	21,470	(5,465)	706	(3,192)
Common stock dividends, amount per share	$ 0.19
Net income (loss)	$ 241		241
Share-based compensation	29	29
Other comprehensive income	(109)			(109)
Common stock dividends	(72)		(72)
Equity	$ 13,826	$ 21,499	$ (5,296)	$ 815	$ (3,192)

Condensed Consolidated Statem_2

Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement of Cash Flows [Abstract]
Net income (loss)	$ (78)	$ 956
Net Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization	802	752
Goodwill impairment	50	0
Provision for credit losses	1,190	459
Gain on mortgage and automotive loans, net	(2)	(12)
Other gain on investments, net	(109)	(147)
Originations and purchases of loans held-for-sale	(1,329)	(528)
Proceeds from sales and repayments of loans held-for-sale	1,167	335
Increase (decrease) in deferred income taxes	0	1
Increase (decrease) in interest payable	56	221
Increase (decrease) in other assets	(420)	(21)
Increase (decrease) in other liabilities	(211)	(114)
Increase (decrease) in other assets and liabilities, net	46	(58)
Net cash provided by operating activities	1,162	1,844
Net Cash (Used in) Provided by Investing Activities [Abstract]
Purchases of equity securities	(740)	(210)
Proceeds from sales of equity securities	774	511
Purchases of available-for-sale securities	7,696	7,018
Proceeds from Sale of Debt Securities, Available-for-sale	5,544	2,568
Proceeds from repayments of available-for-sale securities	4,440	1,805
Purchases of held-to-maturity securities	0	(268)
Proceeds from repayments of held-to-maturity securities	177	107
Purchases of finance receivables and loans held-for-investment	(3,495)	(2,386)
Proceeds from sales of finance receivables and loans initially held-for-investment	1	159
Originations and repayments of finance receivables and loans held-for-investment and other, net	13,135	2,769
Purchases of operating lease assets	(1,949)	(1,769)
Disposals of operating lease assets	1,179	1,321
Net change in nonmarketable equity investments	148	113
Payments for (proceeds from) other, net	(213)	(209)
Net cash provided by (used in) investing activities	11,305	(2,507)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	1,842	3,468
Net increase in deposits	10,272	10,133
Proceeds from issuance of long-term debt	2,372	4,590
Repayments of long-term debt	(7,434)	(11,372)
Repurchase of common stock	(104)	(440)
Dividends paid	(144)	(139)
Net cash provided by (used in) financing activities	3,120	(696)
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 increase (decrease) in cash and cash equivalents and restricted cash	15,584	(1,356)
Cash and cash equivalents and restricted cash [Roll Forward]
Cash and cash equivalents and restricted cash	4,380	5,626
Cash and cash equivalents and restricted cash	19,964	4,270
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	1,722	1,884
Cash paid for income taxes	7	24
Loans held-for-sale transferred to finance receivables and loans held-for-investment	70	125
Finance receivables and loans transferred to loans held-for-sale, noncash	0	20
In-kind distribution from equity method investee	60	0
Equity consideration received in exchange for restructured loans	5	0
Restricted Cash [Abstract]
Cash and cash equivalents as disclosed on the Condensed Consolidated Balance Sheet	19,131	3,563
Restricted cash included in other assets on the Condensed Consolidated Balance Sheet	$ 833	$ 707

Description of Business, Basis

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
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 automotive dealerships and consumers. Our award-winning online bank (Ally Bank, Member FDIC and Equal Housing Lender) offers mortgage lending, personal lending, and a variety of deposit and other banking products, including savings, money-market, and checking accounts, CDs, and 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 BHC under the Bank Holding Company Act of 1956, as amended , and an FHC under the Gramm-Leach-Bliley Act of 1999, as amended . Our accounting and reporting policies conform to U.S. 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, 2020 , and for the three months and six months ended June 30, 2020 , and 2019 , 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, 2019 , as filed on February 25, 2020, with the SEC. Significant Accounting Policies On January 1, 2020, we adopted ASU 2016-13, Financial Instruments — Credit Losses: Measurement of Credit Losses on Financial Instruments, using the modified retrospective approach, as further described in the section below titled Recently Adopted Accounting Standards. Adoption of the standard resulted in changes to our Investments , Finance Receivables and Loans , and Allowance for Loan Losses policies, as presented below. Refer to Note 1 to the Consolidated Financial Statements in our 2019 Annual Report on Form 10-K regarding additional significant accounting policies, including accounting policies in effect prior to the adoption of the CECL standard. Investments Our investment portfolio includes various debt and equity securities. Our debt securities include government securities, corporate bonds, ABS, and MBS. Debt securities are classified based on management’s intent to sell or hold the security. We classify debt securities as held-to-maturity only when we have both the intent and ability to hold the securities to maturity. We classify debt securities as trading when the securities are acquired for the purpose of selling or holding them for a short period of time. Debt securities not classified as either held-to-maturity or trading are classified as available-for-sale. Our portfolio includes debt securities classified as available-for-sale and held-to-maturity. Our available-for-sale securities are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income, while our held-to-maturity securities are carried at amortized cost. We establish an allowance for credit losses for lifetime expected credit losses on our held-to-maturity securities. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Accrued interest receivable on held-to-maturity securities is excluded from the estimate of credit losses. Our held-to-maturity securities portfolio is mostly comprised of residential mortgage-backed debt securities that are issued by U.S. government entities and agencies. These securities are either explicitly or implicitly guaranteed by the U.S. government, are highly rated by major ratings agencies, and have a long history of zero credit losses. We regularly assess our available-for-sale securities for impairment. When the cost of an available-for-sale security exceeds its fair value, the security is impaired. If we determine that we intend to sell, or it is more likely than not we will be required to sell the security before recovery of the amortized cost basis, any allowance for credit losses, if previously recorded, is written off and the security’s amortized cost basis is written down to fair value at the reporting date, with any incremental impairment recorded through earnings. Alternatively, if we do not intend to sell, or it is not more likely than not that we will be required to sell the security before anticipated recovery of the amortized cost basis, we evaluate, among other factors, the magnitude of the decline in fair value, the financial health of and business outlook for the issuer, and the performance of the underlying assets for interests in securitized assets to determine if a credit loss has occurred. The present value of expected future cash flows are compared to the security’s amortized cost basis to measure the credit loss component of the impairment after determining a credit loss has occurred. If the present value of expected cash flows is less than the amortized cost basis, we record an allowance for credit losses for that difference. The amount of credit loss is limited to the difference between the security’s amortized cost basis and its fair value. Any remaining impairment is considered a noncredit loss and is recorded in other comprehensive income. Changes in the allowance for credit losses are recorded as provision for, or reversal of, provision for credit losses. Accrued interest receivable on available-for-sale securities is excluded from the estimate of credit losses. Premiums and discounts on debt securities are generally amortized over the stated maturity of the security as an adjustment to investment yield. Premiums on debt securities that have non-contingent call features that are callable at fixed prices on preset dates are amortized to the earliest call date as an adjustment to investment yield. A debt security is placed on nonaccrual status at the time any principal or interest payments become 90 days past due. The receivable for interest income that is accrued but not collected is reversed against interest income when the debt security is placed on nonaccrual status. Our investments in equity securities include securities that are recognized at fair value with changes in the fair value recorded in earnings, and equity securities that are recognized using other measurement principles. Equity securities that have a readily determinable fair value are recorded at fair value with changes in fair value recorded in earnings and reported in other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. These investments, which are primarily attributable to the investment portfolio of our Insurance operations, are included in equity securities on our Condensed Consolidated Balance Sheet. We also hold certain equity investments that do not have a readily determinable fair value and are not eligible to be recognized using other measurement principles, that are held at fair value. Refer to Note 20 for further information on these equity securities that have a readily determinable market value. Our equity securities recognized using other measurement principles include investments in FHLB and FRB stock held to meet regulatory requirements, equity investments related to LIHTCs and the CRA, which do not have a readily determinable fair value, and other equity investments that do not have a readily determinable fair value. Our LIHTC investments are accounted for using the proportional amortization method of accounting for qualified affordable housing investments. Our obligations related to unfunded commitments for our LIHTC investments are included in other liabilities. The majority of our other CRA investments are accounted for using the equity method of accounting. Our investments in LIHTCs and other CRA investments are included in investments in qualified affordable housing projects and equity-method investments, respectively, in other assets on our Condensed Consolidated Balance Sheet. Our investments in FHLB and FRB stock are carried at cost, less impairment. Our remaining investments in equity securities are recorded at cost, less impairment and adjusted for observable price changes under the measurement alternative provided under GAAP. These investments, along with our investments in FHLB and FRB stock, are included in nonmarketable equity investments in other assets on our Condensed Consolidated Balance Sheet. Investments recorded under the measurement alternative are also reviewed at each reporting period to determine if any adjustments are required for observable price changes in identical or similar securities of the same issuer. As conditions warrant, we review these investments for impairment and adjust the carrying value of the investment if it is deemed to be impaired. Realized gains and losses on the sale of securities are determined using the specific identification method and are reported in other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. Finance Receivables and Loans We initially classify finance receivables and loans as either loans held-for-sale or loans held-for-investment based on management’s assessment of our intent and ability to hold the loans for the foreseeable future or until maturity. Management’s view of the foreseeable future is based on the longest reasonably reliable net income, liquidity, and capital forecast period. Management’s intent and ability with respect to certain loans may change from time to time depending on a number of factors, for example economic, liquidity, and capital conditions. In order to reclassify loans to held-for-sale, management must have the intent to sell the loans and reasonably identify the specific loans to be sold. Loans classified as held-for-sale are presented as loans held-for-sale, net on our Condensed Consolidated Balance Sheet and are carried at the lower of their net carrying value or fair value, unless the fair value option was elected, in which case those loans are carried at fair value. Loan origination fees and costs are included in the initial carrying value of loans originated as held-for-sale for which we have not elected the fair value option. Loan origination fees and costs are recognized in earnings when earned or incurred, respectively, for loans classified as held-for-sale for which we have elected the fair value option. We have elected the fair value option for conforming mortgage direct-to-consumer originations for which we have a commitment to sell. The interest rate lock commitment that we enter into for a mortgage loan originated as held-for-sale and certain forward commitments are considered derivatives, which are carried at fair value on our Condensed Consolidated Balance Sheet. We have elected the fair value option to measure our nonderivative forward commitments. Changes in the fair value of our interest rate lock commitments, derivative forward commitments, and nonderivative forward commitments related to mortgage loans originated as held-for-sale, as well as changes in the carrying value of loans classified as held-for-sale, are reported through gain on mortgage and automotive loans, net in our Condensed Consolidated Statement of Comprehensive Income. Interest income on our loans classified as held-for-sale is recognized based upon the contractual rate of interest on the loan and the unpaid principal balance. We report accrued interest receivable on our loans classified as held-for-sale in other assets on our Condensed Consolidated Balance Sheet. We have also elected the fair value option for certain loans acquired within our consumer other portfolio segment. Changes in fair value related to these loans are reported through other income, net of losses in our Condensed Consolidated Statement of Comprehensive Income. Loans classified as held-for-investment are presented as finance receivables and loans, net on our Condensed Consolidated Balance Sheet. Finance receivables and loans are reported at their amortized cost basis, which includes the principal amount outstanding, net of unamortized deferred fees and costs on originated loans, unamortized premiums and discounts on purchased loans, unamortized basis adjustments arising from the designation of finance receivables and loans as the hedged item in qualifying fair value hedge relationships, and cumulative principal charge-offs. We refer to the amortized cost basis less the allowance for loan loss as the net carrying value in finance receivables and loans. Unearned rate support received from an automotive manufacturer on certain automotive loans, deferred origination fees and costs, and premiums and discounts on purchased loans, are amortized over the contractual life of the related finance receivable or loan using the effective interest method. We make various incentive payments for consumer automotive loan originations to automotive dealers and account for these payments as direct loan origination costs. Additionally, we make incentive payments to certain commercial automobile wholesale borrowers and account for these payments as a reduction to interest income in the period they are earned. Interest income on our finance receivables and loans is recognized based on the contractual rate of interest plus the amortization of deferred amounts using the effective interest method. We report accrued interest receivable on our finance receivables and loans in other assets on our Condensed Consolidated Balance Sheet. Loan commitment fees are generally deferred and amortized over the commitment period. For information on finance receivables and loans, refer to Note 8 . We have elected to exclude accrued interest receivable from the measurement of our allowance for credit losses for each class of financing receivables. We have also elected to write-off accrued interest receivable by reversing interest income when loans are placed on nonaccrual status for each class of financing receivable. Our portfolio segments are based on the level at which we develop and document our methodology for determining the allowance for loan losses. Additionally, the classes of finance receivables are based on several factors including the method for monitoring and assessing credit risk, the method of measuring carrying value, and the risk characteristics of the finance receivable. Based on an evaluation of our process for developing the allowance for loan losses including the nature and extent of exposure to credit risk arising from finance receivables, we have determined our portfolio segments to be consumer automotive, consumer mortgage, consumer other, and commercial. • Consumer automotive — Consists of retail automotive financing for new and used vehicles. • Consumer mortgage — Consists of the following classes of finance receivables. • Mortgage Finance — Consists of consumer first-lien mortgages from our ongoing mortgage operations including bulk acquisitions, direct-to-consumer originations, and refinancing of high-quality jumbo mortgages and LMI mortgages. • Mortgage — Legacy — Consists of consumer mortgage assets originated prior to January 1, 2009, including first-lien mortgages, subordinate-lien mortgages, and home equity mortgages. • Consumer other — Consists of unsecured consumer lending from point-of-sale financing. • Commercial — Consists of the following classes of finance receivables. • Commercial and Industrial • Automotive — Consists of financing operations to fund dealer purchases of new and used vehicles through wholesale floorplan financing. Additional commercial offerings include automotive dealer term loans, revolving lines, and dealer fleet financing. • Other — Consists primarily of senior secured leveraged cash flow and asset-based loans related to our Corporate-Finance business. • Commercial Real Estate — Consists of term loans primarily secured by dealership land and buildings, and other commercial lending secured by real estate. Nonaccrual Loans Generally, we recognize loans of all classes as past due when they are 30 days delinquent on making a contractually required payment, and loans are placed on nonaccrual status when principal or interest has been delinquent for at least 90 days, or when full collection is not expected. Interest income recognition is suspended when finance receivables and loans are placed on nonaccrual status. Additionally, amortization of premiums and discounts and deferred fees and costs ceases when finance receivables and loans are placed on nonaccrual. Exceptions include commercial real estate loans that are placed on nonaccrual status when delinquent for 60 days or when full collection is not probable, if sooner. Additionally, our policy is to generally place all loans that have been modified in a TDR on nonaccrual status until the loan has been brought fully current, the collection of contractual principal and interest is reasonably assured, and six consecutive months of repayment performance is achieved. In certain cases, if a borrower has been current up to the time of the modification and repayment of the debt subsequent to the modification is reasonably assured, we may choose to continue to accrue interest on the loan. Nonperforming loans on nonaccrual status are reported in Note 8 . The receivable for interest income that is accrued, but not collected, at the date finance receivables and loans are placed on nonaccrual status is reversed against interest income and subsequently recognized only to the extent it is received in cash or until it qualifies for return to accrual status. However, where there is doubt regarding the ultimate collectability of loan principal, all cash received is applied to reduce the carrying value of such loans. Generally, finance receivables and loans are restored to accrual status only when contractually current and the collection of future payments is reasonably assured. Troubled Debt Restructurings When the terms of finance receivables or loans are modified, consideration must be given as to whether or not the modification results in a TDR. A modification is considered to be a TDR when both the borrower is experiencing financial difficulty and we grant a concession to the borrower. These considerations require significant judgment and vary by portfolio segment. In all cases, the cumulative impacts of all modifications are considered at the time of the most recent modification. For consumer loans of all classes, various qualitative factors are utilized for assessing the financial difficulty of the borrower. These include, but are not limited to, the borrower’s default status on any of its debts, bankruptcy, and recent changes in financial circumstances (for instance, loss of job). A concession has been granted when as a result of the modification we do not expect to collect all amounts due under the original loan terms, including interest accrued at the original contract rate. Types of modifications that may be considered concessions include, but are not limited to, extensions of terms at a rate that does not constitute a market rate, a reduction, deferral or forgiveness of principal or interest owed and loans that have been discharged in a Chapter 7 Bankruptcy and have not been reaffirmed by the borrower. In addition to the modifications noted above, in our consumer automotive portfolio segment of loans we also provide extensions or deferrals of payments to borrowers whom we deem to be experiencing only temporary financial difficulty. In these cases, there are limits within our operational policies to minimize the number of times a loan can be extended, as well as limits to the length of each extension, including a cumulative cap over the life of the loan. If these limits are breached, the modification is considered a TDR as noted in the following paragraph. Before offering an extension or deferral, we evaluate the capacity of the customer to make the scheduled payments after the deferral period. During the deferral period, we continue to accrue interest on the loan as part of the deferral agreement. We grant these extensions or deferrals when we expect to collect all amounts due including interest accrued at the original contract rate. However, in response to the COVID-19 pandemic, we offered broad-based deferral programs to all of our customers who requested assistance with their loans. A restructuring that results in only a delay in payment that is deemed to be insignificant is not a concession and the modification is not considered to be a TDR. In order to assess whether a restructuring that results in a delay in payment is insignificant, we consider the amount of the restructured payments subject to delay in conjunction with the unpaid principal balance or the collateral value of the loan, whether or not the delay is significant with respect to the frequency of payments under the original contract, or the loan’s original expected duration. In the cases where payment extensions on our automotive loan portfolio cumulatively extend beyond 90 days and are more than 10% of the original contractual term or where the cumulative payment extension is beyond 180 days, we deem the delay in payment to be more than insignificant, and as such, classify these types of modifications as TDRs. Otherwise, we believe that the modifications do not represent a concessionary modification and accordingly, they are not classified as TDRs. Additionally, based on guidance issued by federal and state regulatory agencies, loan modifications made in response to the COVID-19 pandemic are not considered TDRs if accounts were considered current at the date the modification program was implemented. Refer to Note 8 for additional information. For commercial loans of all classes, similar qualitative factors are considered when assessing the financial difficulty of the borrower. In addition to the factors noted above, consideration is also given to the borrower’s forecasted ability to service the debt in accordance with the contractual terms, possible regulatory actions, and other potential business disruptions (for example, the loss of a significant customer or other revenue stream). Consideration of a concession is also similar for commercial loans. In addition to the factors noted above, consideration is also given to whether additional guarantees or collateral have been provided. For all loans, TDR classification typically results from our loss mitigation activities. For loans held-for-investment that are not carried at fair value and are TDRs, impairment is typically measured based on the difference between the amortized cost basis of the loan and the present value of the expected future cash flows of the loan. The present value is calculated using the loan’s original interest rate, as opposed to the interest rate specified within the restructuring. The loan may also be measured for impairment based on the fair value of the underlying collateral less costs to sell for loans that are collateral dependent. We recognize impairment by either establishing a valuation allowance or recording a charge-off. The financial impacts of modifications that meet the definition of a TDR are reported in the period in which they are identified as TDRs. Additionally, if a loan that is classified as a TDR redefaults within 12 months of the modification, we are required to disclose the instances of redefault. For the purpose of this disclosure, we have determined that a loan is considered to have redefaulted when the loan meets the requirements for evaluation under our charge-off policy except for commercial loans where redefault is defined as 90 days past due. Nonaccrual loans may return to accrual status as discussed in the preceding nonaccrual loan section at which time, the normal accrual of interest income resumes. Net Charge-offs We disclose the measurement of net charge-offs as the amount of gross charge-offs recognized less recoveries received. Gross charge-offs reflect the amount of the amortized cost basis directly written-off. Generally, we recognize recoveries when they are received and record them as an increase to the allowance for loan losses. As a general rule, consumer automotive loans are written down to estimated collateral value, less costs to sell, if repossession is assured and in process once a loan becomes 120 days past due. In our consumer mortgage portfolio segment, first-lien mortgages and a subset of our home equity portfolio that are secured by real estate in a first-lien position are written down to the estimated fair value of the collateral, less costs to sell, once a mortgage loan becomes 180 days past due. Consumer mortgage loans that represent second-lien positions are charged off at 180 days past due. Loans in our consumer other segment are charged off at 120 days past due. Within 60 days of receipt of notification of filing from the bankruptcy court, or within the time frames noted above, consumer automotive and first-lien consumer mortgage loans in bankruptcy are written down to their expected future cash flows, which is generally fair value of the collateral, less costs to sell, and second-lien consumer mortgage loans and consumer other loans are fully charged-off, unless it can be clearly demonstrated that repayment is likely to occur. Regardless of other timelines noted within this policy, loans are considered collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to only be through sale or operation of the collateral. Collateral dependent loans are charged-off to the estimated fair value of the underlying collateral, less costs to sell when foreclosure or repossession proceedings begin. Commercial loans are individually evaluated and are written down to the estimated fair value of the collateral less costs to sell when collectability of the recorded balance is in doubt. Generally, all commercial loans are charged-off when it becomes unlikely that the borrower is willing or able to repay the remaining balance of the loan and any underlying collateral is not sufficient to recover the outstanding principal. Collateral dependent loans are charged-off to the fair market value of collateral less costs to sell when appropriate. Noncollateral dependent loans are fully written-off. Allowance for Loan Losses The allowance for loan losses (the allowance) is deducted from, or added to, the loan’s amortized cost basis to present the net amount expected to be collected from our lending portfolios. We estimate the allowance using relevant available information, which includes both internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Additions to the allowance are charged to current period earnings through the provision for loan losses; amounts determined to be uncollectible are charged directly against the allowance, net of amounts recovered on previously charged-off accounts. Expected recoveries do not exceed the total of amounts previously charged-off and amounts expected to be charged-off. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions or renewals, unless the extension or renewal option is included in the original or modified contract at the reporting date and we are not able to unconditionally cancel the option. Expected loan modifications are also not included in the contractual term, unless we have a reasonable expectation at period end that a TDR will be executed with a borrower. For the purpose of calculating portfolio-level reserves, we have grouped our loans into four portfolio segments: consumer automotive, consumer mortgage, consumer other, and commercial. The allowance for loan losses is measured on a collective basis using statistical models when loans have similar risk characteristics. These statistical models are designed to correlate certain macroeconomic variables to expected future credit losses. The macroeconomic data used in the models are based on forecasted rates for the next 12-months. These forecasted variables are derived from both internal and external sources. Beyond this forecast period, we revert to a historical average rate. This reversion to the mean is performed on a straight-line basis over 24 months. The historical average is calculated using historical data beginning in January 2008 through the current period. Loans that do not share similar risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. The allowance calculation is also supplemented with qualitative reserves that take into consideration current portfolio and asset-level factors, such as the impacts of changes in underwriting standards, collections and account management effectiveness, geographic concentrations, and economic events that have occurred but are not yet reflected in the quantitative model component. Qualitative adjustments are documented, reviewed, and approved through our established risk governance processes and follow regulatory guidance. Management also considers the need for a reserve on unfunded nonderivative loan commitments across our portfolio segments, including lines of credit and standby letters of credit. We estimate expected credit losses over the contractual period in which we are exposed to credit risk, unless we have the option to unconditionally cancel the obligation. Expected credit losses include consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over the estimated life. The reserve for unfunded loan commitments is recorded within other liabilities on our Condensed Consolidated Balance Sheet. Refer to Note 28 within our 2019 Annual Report on Form 10-K for information on our unfunded loan commitments. Consumer Automotive The allowance for loan losses within the consumer automotive portfolio segment is calculated using proprietary statistical models and other risk indicators applied to pools of loans with similar risk characteristics, including credit bureau score and LTV ratios. The model generates projections of default rates, prepayment rates, loss severity rates, and recovery rates using macroeconomic and historical loan data. These projections are used to develop transition scenarios to predict the portfolio’s migration from the current past-due status to various future states over the life of the loan. While the macroeconomic data that is used to calculate expected credit losses includes interest rate indices and national and state-level home price indices, national and state-level unemployment rates are the most impactful macroeconomic factors in calculating expected lifetime credit losses. The loss severity within the consumer automotive portfolio segment is impacted by the market values of vehicles that are repossessed. Vehicle market values are affected

Acquisitions (Notes)

Acquisitions (Notes)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Acquisitions On October 1, 2019 , we acquired 100% of the equity of Credit Services Corporation, LLC, including its wholly owned subsidiary, Health Credit Services LLC (collectively Health Credit Services), a digital point-of-sale payment provider that offers financing to consumers for various healthcare procedures or services, for $177 million in cash. Health Credit Services operates as a wholly owned subsidiary of Ally. Beginning in October 2019, financial information related to Health Credit Services, which we renamed Ally Lending, is included within Corporate and Other. For further information on our acquisition of Health Credit Services, refer to Note 2 in our 2019 Annual Report on Form 10-K. Additionally, in February 2020, we entered into a merger agreement to acquire Cardholder Management Services, Inc. and its subsidiaries, including CardWorks, Inc. and Merrick Bank Corporation (collectively, CardWorks). CardWorks is a nonprime credit-card and consumer-finance provider in the United States with servicing and merchant-service capabilities across the credit spectrum. On June 24, 2020, the parties to the merger agreement (other than the stockholders’ representative) mutually agreed to terminate it. We will not incur any termination or breakup fees as a result of the execution of the mutual termination agreement.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2020
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 Topic 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 VSCs, GAP contracts, and 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 Topic 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 2019 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 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 142 $ — $ — $ — $ 142 Remarketing fee income 15 — — — — 15 Brokerage commissions and other revenue — — — — 14 14 Brokered/agent commissions — 4 — — — 4 Deposit account and other banking fees — — — — 1 1 Other 3 — — — — 3 Total revenue from contracts with customers 18 146 — — 15 179 All other revenue 22 292 19 6 37 376 Total other revenue (d) $ 40 $ 438 $ 19 $ 6 $ 52 $ 555 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 Brokered/agent commissions — 4 — — — 4 Deposit account and other banking fees — — — — 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 (a) We had opening balances of $2.9 billion and $2.7 billion in unearned revenue associated with outstanding contracts at April 1, 2020, and April 1, 2019, respectively, and $211 million and $202 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, 2020 , and June 30, 2019 . (b) At June 30, 2020 , we had unearned revenue of $2.9 billion associated with outstanding contracts, and with respect to this balance we expect to recognize revenue of $406 million during the remainder of 2020 , $747 million in 2021 , $649 million in 2022 , $520 million in 2023 , and $596 million thereafter. At June 30, 2019 , we had unearned revenue of $2.8 billion associated with outstanding contracts. (c) We had deferred insurance assets of $1.7 billion and $1.8 billion at April 1, 2020, and June 30, 2020 , respectively, and recognized $121 million of expense during the three months ended June 30, 2020 . We had deferred insurance assets of $1.6 billion at both April 1, 2019, and June 30, 2019 , and recognized $114 million of expense during the three months ended June 30, 2019 . (d) Represents a component of total net revenue. Refer to Note 22 for further information on our reportable operating segments. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 285 $ — $ — $ — $ 285 Remarketing fee income 32 — — — — 32 Brokerage commissions and other revenue — — — — 27 27 Brokered/agent commissions — 8 — — — 8 Deposit account and other banking fees — — — — 5 5 Other 8 — — — — 8 Total revenue from contracts with customers 40 293 — — 32 365 All other revenue 47 282 29 19 79 456 Total other revenue (c) $ 87 $ 575 $ 29 $ 19 $ 111 $ 821 2019 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 265 $ — $ — $ — $ 265 Remarketing fee income 37 — — — — 37 Brokerage commissions and other revenue — — — — 34 34 Brokered/agent commissions — 7 — — — 7 Deposit account and other banking fees — — — — 9 9 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 (a) We had opening balances of $2.9 billion and $2.6 billion in unearned revenue associated with outstanding contracts at January 1, 2020, and January 1, 2019, respectively, and $425 million and $401 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, 2020 , and June 30, 2019 . (b) We had deferred insurance assets of $1.7 billion and $1.8 billion January 1, 2020, and June 30, 2020 , respectively, and recognized $246 million of expense during the six months ended June 30, 2020 . 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 . (c) Represents a component of total net revenue. Refer to Note 22 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 losses of $11 million and $9 million for the three months and six months ended June 30, 2020 , respectively, and net remarketing gains of $23 million and $38 million for the three months and six months ended June 30, 2019 , on the sale of off-lease vehicles. These losses and 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, 2020
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) 2020 2019 2020 2019 Income from equity-method investments $ 53 $ 8 $ 52 $ 12 Late charges and other administrative fees 16 28 37 57 Remarketing fees 15 19 32 37 Servicing fees 2 4 5 10 Other, net 4 34 44 64 Total other income, net of losses $ 90 $ 93 $ 170 $ 180

Reserves for Insurance Losses a

Reserves for Insurance Losses and Loss Adjustment Expenses	6 Months Ended
	Jun. 30, 2020
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [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) 2020 2019 Total gross reserves for insurance losses and loss adjustment expenses at January 1, $ 122 $ 134 Less: Reinsurance recoverable 88 96 Net reserves for insurance losses and loss adjustment expenses at January 1, 34 38 Net insurance losses and loss adjustment expenses incurred related to: Current year 215 186 Prior years (a) 1 — Total net insurance losses and loss adjustment expenses incurred 216 186 Net insurance losses and loss adjustment expenses paid or payable related to: Current year (178 ) (134 ) Prior years (26 ) (27 ) Total net insurance losses and loss adjustment expenses paid or payable (204 ) (161 ) Net reserves for insurance losses and loss adjustment expenses at June 30, 46 63 Plus: Reinsurance recoverable 86 90 Total gross reserves for insurance losses and loss adjustment expenses at June 30, $ 132 $ 153 (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, 2020
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) 2020 2019 2020 2019 Insurance commissions $ 127 $ 117 $ 253 $ 231 Technology and communications 80 73 159 150 Lease and loan administration 46 43 84 82 Advertising and marketing 32 35 76 83 Property and equipment depreciation 34 25 68 47 Professional services 28 30 59 59 Regulatory and licensing fees 29 28 58 56 Vehicle remarketing and repossession 11 25 34 52 Occupancy 13 16 29 29 Non-income taxes 7 11 14 20 Amortization of intangible assets 5 3 10 6 Other 47 52 101 96 Total other operating expenses $ 459 $ 458 $ 945 $ 911

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2020
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 securities were as follows. June 30, 2020 December 31, 2019 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 $ 784 $ 23 $ — $ 807 $ 2,059 $ 6 $ (17 ) $ 2,048 U.S. States and political subdivisions 876 38 (1 ) 913 623 19 (1 ) 641 Foreign government 153 9 — 162 184 3 (1 ) 186 Agency mortgage-backed residential 19,136 752 (4 ) 19,884 21,183 257 (36 ) 21,404 Mortgage-backed residential 3,387 42 (4 ) 3,425 2,841 20 (11 ) 2,850 Agency mortgage-backed commercial 1,647 139 — 1,786 1,344 44 (6 ) 1,382 Mortgage-backed commercial 41 — (3 ) 38 41 1 — 42 Asset-backed 352 4 — 356 365 3 — 368 Corporate debt 1,761 97 (4 ) 1,854 1,327 37 (1 ) 1,363 Total available-for-sale securities (a) (b) (c) (d) (e) $ 28,137 $ 1,104 $ (16 ) $ 29,225 $ 29,967 $ 390 $ (73 ) $ 30,284 Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 1,376 $ 86 $ — $ 1,462 $ 1,547 $ 38 $ (6 ) $ 1,579 Asset-backed retained notes 14 — — 14 21 — — 21 Total held-to-maturity securities (e) (f) (g) $ 1,390 $ 86 $ — $ 1,476 $ 1,568 $ 38 $ (6 ) $ 1,600 (a) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $13 million and $12 million at June 30, 2020 , and December 31, 2019 , respectively. (b) Certain available-for-sale securities are included in fair value hedging relationships. Refer to Note 18 for additional information. (c) Available-for-sale securities with a fair value of $215 million and $1.9 billion at June 30, 2020 , and December 31, 2019 , respectively, were pledged to secure advances from the FHLB, repurchase agreements, other short-term borrowings, or for other purposes as required by contractual obligation or law. Under these agreements, we granted the counterparty the right to sell or pledge $215 million and $118 million of the underlying investment securities at June 30, 2020 , and December 31, 2019 , respectively. (d) Totals do not include accrued interest receivable, which was $90 million and $98 million at June 30, 2020 , and December 31, 2019 , respectively. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet . (e) There was no allowance for credit losses recorded at June 30, 2020 , as management determined that credit losses did not exist for our portfolio of available-for-sale and held-to-maturity securities. (f) Held-to-maturity securities with a fair value of $915 million at December 31, 2019 , were pledged to secure advances from the FHLB. We did not pledge any held-to-maturity securities at June 30, 2020 . (g) Totals do not include accrued interest receivable, which was $3 million at both June 30, 2020 , and December 31, 2019 . Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet . The maturity distribution of debt securities outstanding is summarized in the following tables based upon contractual maturities. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2020 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 807 1.2 % $ 14 0.3 % $ 709 1.1 % $ 84 1.7 % $ — — % U.S. States and political subdivisions 913 3.2 20 2.5 88 2.4 176 2.9 629 3.4 Foreign government 162 2.1 8 1.7 79 2.3 75 2.0 — — Agency mortgage-backed residential 19,884 3.2 — — — — 44 2.0 19,840 3.2 Mortgage-backed residential 3,425 3.2 — — — — — — 3,425 3.2 Agency mortgage-backed commercial 1,786 2.5 — — 3 3.3 1,247 2.6 536 2.2 Mortgage-backed commercial 38 3.6 — — — — — — 38 3.6 Asset-backed 356 3.4 — — 294 3.5 28 2.6 34 3.1 Corporate debt 1,854 3.0 153 2.9 705 2.9 973 3.1 23 2.4 Total available-for-sale securities $ 29,225 3.1 $ 195 2.6 $ 1,878 2.3 $ 2,627 2.8 $ 24,525 3.2 Amortized cost of available-for-sale securities $ 28,137 $ 193 $ 1,821 $ 2,431 $ 23,692 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,376 3.2 % $ — — % $ — — % $ — — % $ 1,376 3.2 % Asset-backed retained notes 14 2.4 — — 14 2.4 — — — — Total held-to-maturity securities $ 1,390 3.2 $ — — $ 14 2.4 $ — — $ 1,376 3.2 December 31, 2019 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 2,048 1.5 % $ 65 2.1 % $ 1,590 1.4 % $ 393 1.7 % $ — — % U.S. States and political subdivisions 641 3.1 22 2.7 75 2.3 159 2.8 385 3.4 Foreign government 186 1.9 35 0.4 65 2.3 86 2.3 — — Agency mortgage-backed residential 21,404 3.2 — — — — 47 2.0 21,357 3.2 Mortgage-backed residential 2,850 3.2 — — — — — — 2,850 3.2 Agency mortgage-backed commercial 1,382 2.9 — — 3 3.2 1,109 3.0 270 2.4 Mortgage-backed commercial 42 3.5 — — — — — — 42 3.5 Asset-backed 368 3.5 — — 317 3.6 5 2.7 46 3.0 Corporate debt 1,363 3.2 125 2.9 580 3.0 649 3.4 9 3.3 Total available-for-sale securities $ 30,284 3.1 $ 247 2.3 $ 2,630 2.1 $ 2,448 2.8 $ 24,959 3.2 Amortized cost of available-for-sale securities $ 29,967 $ 246 $ 2,624 $ 2,378 $ 24,719 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,547 3.2 % $ — — % $ — — % $ — — % $ 1,547 3.2 % Asset-backed retained notes 21 2.2 — — 21 2.2 — — — — Total held-to-maturity securities $ 1,568 3.2 $ — — $ 21 2.2 $ — — $ 1,547 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 $3.2 billion and $73 million at June 30, 2020 , and December 31, 2019 , respectively, and were composed primarily of money-market funds and short-term securities, including U.S. Treasury bills. The following table presents interest and dividends on investment securities. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Taxable interest $ 177 $ 220 $ 382 $ 434 Taxable dividends 5 3 10 6 Interest and dividends exempt from U.S. federal income tax 5 4 8 9 Interest and dividends on investment securities $ 187 $ 227 $ 400 $ 449 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. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Available-for-sale securities Gross realized gains $ 19 $ 24 $ 124 $ 34 Gross realized losses (a) — — — (1 ) Net realized gains on available-for-sale securities 19 24 124 33 Net realized gain on equity securities 80 10 81 39 Net unrealized gain (loss) on equity securities 89 5 (96 ) 75 Other gain on investments, net $ 188 $ 39 $ 109 $ 147 (a) Certain available-for-sale securities were sold at a loss during the six months ended June 30, 2019 , as a result of identifiable market or credit events, 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 following table presents the credit quality of our held-to-maturity securities, based on the latest available information as of June 30, 2020 . The credit ratings are sourced from nationally recognized statistical rating organizations, which include S&P, Moody’s, and Fitch, and represent a composite of the ratings or, where credit ratings cannot be sourced from the agencies, are presented based on the asset type. All our held-to-maturity securities were current in their payment of principal and interest as of June 30, 2020 . We have not recorded any interest income reversals on our held-to-maturity securities during the six months ended June 30, 2020 . June 30, 2020 ($ in millions) AAA AA Total (a) Debt securities Agency mortgage-backed residential $ — $ 1,376 $ 1,376 Asset-backed retained notes 14 — 14 Total held-to-maturity securities $ 14 $ 1,376 $ 1,390 (a) Rating agencies indicate that they base their ratings on many quantitative and qualitative factors, which may include capital adequacy, liquidity, asset quality, business mix, level and quality of earnings, and the current operating, legislative, and regulatory environment. A credit rating is not a recommendation to buy, sell, or hold securities, and the ratings are subject to revision or withdrawal at any time by the assigning rating agency. The following table summarizes held-to-maturity securities in an unrealized loss position at December 31, 2019, prior to the date of adoption of the amendments to the credit loss standard, and as defined by the previous accounting guidance in effect at that time. December 31, 2019 Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 283 $ (6 ) $ — $ — Asset-backed retained notes — — 3 — Total held-to-maturity debt securities $ 283 $ (6 ) $ 3 $ — The table below summarizes available-for-sale securities in an unrealized loss position, which we evaluated to determine if a credit loss exists requiring the recognition of an allowance for credit losses. For additional information on our methodology, refer to Note 1 . As of June 30, 2020 , we did not have the intent to sell the available-for-sale 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, management determined that no credit reserves were required at June 30, 2020 . We have not recorded any interest income reversals on our available-for-sale securities during the six months ended June 30, 2020 . June 30, 2020 December 31, 2019 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 $ 9 $ — $ — $ — $ 1,267 $ (11 ) $ 279 $ (6 ) U.S. States and political subdivisions 55 — 5 (1 ) 72 (1 ) 5 — Foreign government 2 — — — 40 (1 ) 3 — Agency mortgage-backed residential 404 (4 ) 5 — 4,606 (23 ) 908 (13 ) Mortgage-backed residential 350 (4 ) — — 613 (4 ) 203 (7 ) Agency mortgage-backed commercial — — — — 335 (6 ) — — Mortgage-backed commercial 34 (3 ) — — — — — — Asset-backed 38 — 1 — 8 — 11 — Corporate debt 80 (3 ) 14 (1 ) 71 — 41 (1 ) Total available-for-sale securities $ 972 $ (14 ) $ 25 $ (2 ) $ 7,012 $ (46 ) $ 1,450 $ (27 ) We adopted ASU 2016-13 on January 1, 2020, on a modified retrospective basis, as further described in Note 1 . Under the new guidance, once it is determined that a credit loss has occurred, an allowance for credit losses is established on our available-for-sale and held-to-maturity securities. Prior to adoption of this standard, when a decline in fair value of a debt security was determined to be other than temporary, an impairment charge for the credit component was recorded, and a new cost basis in the investment was established. During the six months ended June 30, 2020 , management determined that credit losses did not exist for securities in an unrealized loss position. This analysis considered a variety of factors including, but not limited to, performance indicators of the issuer, default rates, industry analyst reports, credit ratings, and other relevant information, which indicated that contractual cash flows are expected to occur.

Finance Receivables and Loans,

Finance Receivables and Loans, Net (Notes)	6 Months Ended
	Jun. 30, 2020
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 amortized cost basis was as follows. ($ in millions) June 30, 2020 December 31, 2019 Consumer automotive (a) $ 72,712 $ 72,390 Consumer mortgage Mortgage Finance (b) 16,429 16,181 Mortgage — Legacy (c) 984 1,141 Total consumer mortgage 17,413 17,322 Consumer other (d) 240 212 Total consumer 90,365 89,924 Commercial Commercial and industrial Automotive 17,755 28,332 Other 5,315 5,014 Commercial real estate 4,799 4,961 Total commercial 27,869 38,307 Total finance receivables and loans (e) (f) $ 118,234 $ 128,231 (a) Certain finance receivables and loans are included in fair value hedging relationships. Refer to Note 18 for additional information. (b) Includes loans originated as interest-only mortgage loans of $8 million and $11 million at June 30, 2020 , and December 31, 2019 , respectively, 33% of which are expected to start principal amortization in 2020. The remainder of these loans have exited the interest-only period. (c) Includes loans originated as interest-only mortgage loans of $171 million and $212 million at June 30, 2020 , and December 31, 2019 , respectively, of which 99% have exited the interest-only period. (d) Includes $8 million and $11 million of finance receivables at June 30, 2020 , and December 31, 2019 , respectively, for which we have elected the fair value option. (e) Totals include net unearned income, unamortized premiums and discounts, and deferred fees and costs of $2.0 billion at June 30, 2020 . (f) Totals do not include accrued interest receivable, which was $995 million and $488 million at June 30, 2020 , and December 31, 2019 , respectively. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet. The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans for the three and six months ended June 30, 2020, and includes the cumulative effect of adopting ASU 2016-13. Three months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at April 1, 2020 $ 2,833 $ 39 $ 45 $ 328 $ 3,245 Charge-offs (b) (245 ) (2 ) (4 ) (40 ) (291 ) Recoveries 108 4 — 1 113 Net charge-offs (137 ) 2 (4 ) (39 ) (178 ) Provision for credit losses 269 1 6 11 287 Other (2 ) — 2 — — Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $8 million of finance receivables at June 30, 2020 , for which we have elected the fair value option. (b) Represents the amount of the amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 for more information regarding our charge-off policies. Six months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at December 31, 2019 $ 1,075 $ 46 $ 9 $ 133 $ 1,263 Cumulative effect of the adoption of Accounting Standards Update 2016-13 1,334 (6 ) 16 2 1,346 Allowance at January 1, 2020 2,409 40 25 135 2,609 Charge-offs (b) (618 ) (5 ) (9 ) (43 ) (675 ) Recoveries 219 9 1 2 231 Net charge-offs (399 ) 4 (8 ) (41 ) (444 ) Provision for credit losses 954 (2 ) 31 207 1,190 Other (1 ) — 1 (1 ) (1 ) Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $8 million and $11 million of finance receivables at June 30, 2020 , and December 31, 2019, respectively, for which we have elected the fair value option. (b) Represents the amount of the amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 for more information regarding our charge-off policies. The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans for the three and six months ended June 30, 2019, prior to the adoption of ASU 2016-13, as defined by the previous accounting guidance in effect at that time. Three months ended June 30, 2019 ($ 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 amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis 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 2019 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 credit 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 amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis 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 2019 Annual Report on Form 10-K for more information regarding our charge-off policies. During the second half of March 2020, the broader economy experienced a significant deterioration driven by the COVID-19 pandemic, which impacted our allowance for loan losses. During the three months ended March 31, 2020, we recorded an additional $602 million of provision expense for credit losses associated with the deterioration in the macroeconomic outlook from COVID-19. During the second quarter of 2020, we incurred total provision expense of $287 million , which included $128 million attributable to the macroeconomic environment and other factors aside from changes in portfolio size and incremental charge-offs. The following table presents information about significant sales of finance receivables and loans and transfers of finance receivables and loans from held-for-investment to held-for-sale based on net carrying value. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Consumer automotive $ — $ — $ — $ 20 Total sales and transfers (a) $ — $ — $ — $ 20 (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 were transferred to held-for-sale during 2018, 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) 2020 2019 2020 2019 Consumer automotive $ 635 $ 218 $ 995 $ 317 Consumer mortgage 1,870 678 2,354 1,913 Commercial 1 3 1 3 Total purchases of finance receivables and loans $ 2,506 $ 899 $ 3,350 $ 2,233 Nonaccrual and Impaired Loans Following the adoption of CECL as of January 1, 2020, the definitions of impairment and related impaired loan disclosures were removed. Under CECL, we present the amortized cost of our finance receivables and loans on nonaccrual status including such loans with no allowance. The following table presents the amortized cost of our finance receivables and loans on nonaccrual status as of the beginning or end of the three months and six months ended June 30, 2020 . All consumer or commercial finance receivables and loans that were 90 days or more past due were on nonaccrual status as of June 30, 2020 , and December 31, 2019 . June 30, 2020 ($ in millions) Nonaccrual status at Jan. 1, 2020 Nonaccrual status at April 1, 2020 Nonaccrual status Nonaccrual with no allowance (a) Consumer automotive $ 762 $ 1,077 $ 1,250 $ 633 Consumer mortgage Mortgage Finance 17 22 27 6 Mortgage — Legacy 40 40 36 28 Total consumer mortgage 57 62 63 34 Consumer other 2 1 1 — Total consumer 821 1,140 1,314 667 Commercial Commercial and industrial Automotive 73 86 80 13 Other 138 162 132 78 Commercial real estate 4 8 6 6 Total commercial 215 256 218 97 Total consumer and commercial finance receivables and loans $ 1,036 $ 1,396 $ 1,532 $ 764 (a) Represents a component of nonaccrual status at end of period. During the three months and six months ended June 30, 2020 , we recorded interest income from cash payments of $4 million and $6 million associated with finance receivables and loans in nonaccrual status. The following table presents information about our impaired finance receivables and loans at December 31, 2019, prior to the date of adoption of the amendments to the credit loss standard and as defined by the previous accounting guidance in effect at that time. December 31, 2019 ($ in millions) Unpaid principal balance (a) Gross carrying value Impaired with no allowance Impaired with an allowance Allowance for impaired loans Consumer automotive $ 553 $ 538 $ 113 $ 425 $ 38 Consumer mortgage Mortgage Finance 14 14 6 8 — Mortgage — Legacy 199 194 64 130 18 Total consumer mortgage 213 208 70 138 18 Total consumer 766 746 183 563 56 Commercial Commercial and industrial Automotive 73 73 1 72 12 Other 170 138 73 65 21 Commercial real estate 4 4 4 — — Total commercial 247 215 78 137 33 Total consumer and commercial finance receivables and loans $ 1,013 $ 961 $ 261 $ 700 $ 89 (a) Adjusted for charge-offs. The following table presents average balance and interest income for our impaired finance receivables and loans for the three months and six months ended June 30, 2019 , prior to the date of adoption of the amendments to the credit loss standard and as defined by the previous accounting guidance in effect at that time. Three months ended June 30, 2019 Six months ended June 30, 2019 ($ in millions) Average balance Interest income Average balance Interest income Consumer automotive $ 498 $ 9 $ 498 $ 17 Consumer mortgage Mortgage Finance 14 — 15 — Mortgage — Legacy 209 2 211 5 Total consumer mortgage 223 2 226 5 Total consumer 721 11 724 22 Commercial Commercial and industrial Automotive 113 — 143 1 Other 108 — 117 — Commercial real estate 6 — 6 — Total commercial 227 — 266 1 Total consumer and commercial finance receivables and loans $ 948 $ 11 $ 990 $ 23 Credit Quality Indicators We evaluate the credit quality of our consumer loan portfolio based on the aging status of the loan and by payment activity. Loan delinquency reporting is based upon borrower payment activity, relative to the contractual terms of the loan. Beginning March 2020, in response to the COVID-19 pandemic, we began to offer several programs to help support our customers and manage credit risk. In our automotive finance business, existing customers had the option to elect to defer their loan and lease payments for up to 120 days without late fees being incurred but, for consumer automotive loans, with finance charges continuing to accrue. This program was made available to consumer automotive loan and lease customers from March 18, 2020, through June 21, 2020. Approximately 1.3 million consumer automotive loan and lease customers enrolled in the program, and of the 1.2 million consumer automotive loan customers enrolled in the program, 64% were granted a 120-day deferral at the time of enrollment. As of June 30, 2020 , approximately 840,000 or 21% of our consumer automotive loan customers were enrolled in the program. Of these enrolled customers, approximately 97% were current on their loans at the time of enrollment, and approximately 16% chose to make at least one payment while in the deferral program. The vast majority of our loan deferrals for customers in the program are scheduled to expire by the end of August 2020. In our mortgage-lending business, existing customers experiencing financial hardship due to an interruption of income related to the COVID-19 pandemic have been afforded the opportunity to defer their loan payments for up to 120 days, with an option for an additional 60 days, without late fees being incurred but with interest continuing to accrue. This program was made available to mortgage-lending customers beginning March 18, 2020, and we plan to make the program available through July 31, 2020. As of June 30, 2020, approximately 1,900 or 5% of our mortgage-lending customers were enrolled in the program. Approximately 92% of these enrolled customers were current on their loans at the time of enrollment. We expect that the initial forbearance period for the majority of these customers will end by September 30, 2020. As of June 30, 2020, approximately 44% of enrolled customers made a payment in the month of June. In our personal-lending business, existing customers experiencing financial hardship due to the COVID-19 pandemic had the opportunity to elect to defer their loan payments for up to 120 days without late fees being incurred or finance charges continuing to accrue. In addition to this program, we temporarily suspended late fees for all customers with current accounts. The loan-deferral program was made available to personal-lending customers from March 23, 2020, through June 30, 2020. As of June 30, 2020, approximately 6,300 or 7% of our personal-lending customers were enrolled in the program. Approximately 84% of these enrolled customers were current on their loans at the time of enrollment. We expect that the majority of these customers will exit the program during the third quarter of 2020. As of June 30, 2020, approximately 20% of enrolled customers chose to make at least one payment during the deferral period. In accordance with regulatory guidance, if borrowers are less than 30 days past due on their loans and enter into loan modifications offered as a result of COVID-19, their loans generally continue to be considered performing loans and continue to accrue interest during the period of the loan modification. For borrowers who are 30 days or more past due when entering into loan modifications offered as a result of COVID-19, we evaluate the loan modifications under our existing troubled debt restructuring framework, and where such a loan modification would result in a concession to a borrower experiencing financial difficulty, the loan will be accounted for as a TDR and will generally not accrue interest. For all borrowers who enroll in these loan modification programs offered as a result of COVID-19, the delinquency status of the borrowers is frozen as of the date immediately preceding the commencement of the program, resulting in a static delinquency metric during the deferral period. Upon exiting the deferral program, the measurement of loan delinquency will resume where it had left off upon entry into the program. The following table presents the amortized cost basis of our consumer finance receivables and loans by credit quality indicator based on delinquency status at June 30, 2020 , and origination year. Origination year Revolving loans converted to term June 30, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Consumer automotive Current $ 13,963 $ 23,534 $ 15,405 $ 9,404 $ 5,152 $ 2,905 $ — $ — $ 70,363 30–59 days past due 52 410 374 270 176 114 — — 1,396 60–89 days past due 17 122 120 87 59 39 — — 444 90 or more days past due 9 121 136 107 79 57 — — 509 Total consumer automotive 14,041 24,187 16,035 9,868 5,466 3,115 — — 72,712 Consumer mortgage Mortgage Finance Current 2,047 3,006 2,380 3,151 1,375 4,364 — 1 16,324 30–59 days past due 9 7 12 14 11 30 — — 83 60–89 days past due — 1 3 1 4 3 — — 12 90 or more days past due — — 2 1 1 6 — — 10 Total Mortgage Finance 2,056 3,014 2,397 3,167 1,391 4,403 — 1 16,429 Mortgage — Legacy Current — — — — — 482 343 120 945 30–59 days past due — — — — — 8 2 2 12 60–89 days past due — — — — — 3 1 — 4 90 or more days past due — — — — — 17 5 1 23 Total Mortgage — Legacy — — — — — 510 351 123 984 Total consumer mortgage 2,056 3,014 2,397 3,167 1,391 4,913 351 124 17,413 Consumer other Current 109 86 25 7 1 — — — 228 30–59 days past due 1 — — — — — — — 1 60–89 days past due 1 1 — — — — — — 2 90 or more days past due — 1 — — — — — — 1 Total consumer other (a) 111 88 25 7 1 — — — 232 Total consumer $ 16,208 $ 27,289 $ 18,457 $ 13,042 $ 6,858 $ 8,028 $ 351 $ 124 $ 90,357 (a) Excludes $8 million of finance receivables at June 30, 2020 , for which we have elected the fair value option. The following table presents an analysis of our past-due finance receivables and loans recorded at amortized cost basis at December 31, 2019. ($ 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 December 31, 2019 Consumer automotive $ 2,185 $ 590 $ 367 $ 3,142 $ 69,248 $ 72,390 Consumer mortgage Mortgage Finance 56 11 9 76 16,105 16,181 Mortgage — Legacy 25 8 28 61 1,080 1,141 Total consumer mortgage 81 19 37 137 17,185 17,322 Consumer other (a) 3 2 2 7 194 201 Total consumer $ 2,269 $ 611 $ 406 $ 3,286 $ 86,627 $ 89,913 (a) Excludes $11 million of finance receivables at December 31, 2019 , for which we have elected the fair value option. We evaluate the credit quality of our commercial loan portfolio using regulatory risk ratings, which are based on relevant information about the borrower’s financial condition, including current financial information, historical payment experience, credit documentation, and current economic trends, among other factors. We use the following definitions for risk rankings. Special mention Loans that have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or the institution’s credit position at some future date. Substandard Loans that are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. These loans have a well-defined weakness or weakness that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful Loans that have all the weaknesses inherent in those classified as substandard, with the additional characteristic that the weaknesses make collection or liquidation in full, based on the basis of currently existing facts, conditions, and values, highly questionable and improbable. The regulatory risk classification utilized is influenced by internal credit risk ratings, which are based on a variety of factors. A borrower’s internal credit risk rating is updated at least annually, and more frequently when a borrower’s credit profile changes, including when we become aware of potential credit deterioration. The following table presents the amortized cost basis of our commercial finance receivables and loans by credit quality indicator based on risk rating at June 30, 2020 , and origination year. Origination year Revolving loans converted to term June 30, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Commercial and industrial Automotive Pass $ 785 $ 281 $ 107 $ 112 $ 72 $ 78 $ 13,802 $ — $ 15,237 Special mention 61 18 54 65 33 14 2,157 — 2,402 Substandard 1 2 — — — — 82 — 85 Doubtful — — 1 2 — — 28 — 31 Total automotive 847 301 162 179 105 92 16,069 — 17,755 Other Pass 419 631 338 299 117 98 1,912 73 3,887 Special mention — 202 256 225 94 119 293 38 1,227 Substandard — — — 38 — 133 19 11 201 Doubtful — — — — — — — — — Total other 419 833 594 562 211 350 2,224 122 5,315 Commercial real estate Pass 386 1,058 873 619 712 803 — 2 4,453 Special mention 16 71 62 69 84 31 — — 333 Substandard — — — 3 — 7 — — 10 Doubtful — — — — 2 1 — — 3 Total commercial real estate 402 1,129 935 691 798 842 — 2 4,799 Total commercial $ 1,668 $ 2,263 $ 1,691 $ 1,432 $ 1,114 $ 1,284 $ 18,293 $ 124 $ 27,869 The following table presents historical credit quality indicators for our commercial finance receivables and loans at December 31, 2019, prior to the date of adoption of the amendments to the credit loss standard and as defined by the previous accounting guidance in effect at that time. December 31, 2019 ($ in millions) Pass Criticized (a) Total Commercial and industrial Automotive $ 25,235 $ 3,097 $ 28,332 Other 4,225 789 5,014 Commercial real estate 4,620 341 4,961 Total commercial $ 34,080 $ 4,227 $ 38,307 (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. As a result of the COVID-19 pandemic, we announced a series of actions to support our automotive-dealer customers and manage credit risk within our lending portfolios. For dealers with current accounts, we have offered for up to four months a waiver of curtailments on wholesale floorplan loans, an increase in used vehicle floorplan advance rates, a deferral of interest and insurance charges on wholesale borrowings, and a deferral of term loan payments . As of June 30, 2020, approximately 2,290 or 73% of eligible dealers had requested at least one form of this assistance. Approximately 39% of eligible wholesale dealers deferred wholesale interest and insurance payments during the second quarter of 2020, which represented a decline from the first quarter of approximately 20 percentage points. Dealers that elected to defer wholesale interest and insurance payments have the option to repay such balances over a 4- or 12-month period without additional interest charges or fees. The accounts enrolled in the program continue to accrue interest on principal balances in accordance with recently issued guidance from regulators. Additionally, if the borrower was no more than 30 days past due as of the date the modification program was implemented, the modification was not considered a TDR. The following table presents an analysis of our past-due commercial finance receivables and loans recorded at amortized cost basis. ($ 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, 2020 Commercial Commercial and industrial Automotive $ — $ 1 $ 48 $ 49 $ 17,706 $ 17,755 Other — — — — 5,315 5,315 Commercial real estate — — 6 6 4,793 4,799 Total commercial $ — $ 1 $ 54 $ 55 $ 27,814 $ 27,869 December 31, 2019 Commercial Commercial and industrial Automotive $ 34 $ — $ 28 $ 62 $ 28,270 $ 28,332 Other — — 17 17 4,997 5,014 Commercial real estate — — 4 4 4,957 4,961 Total commercial $ 34 $ — $ 49 $ 83 $ 38,224 $ 38,307 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 amortized cost were $1.3 billion and $867 million at June 30, 2020 , and December 31, 2019, respectively. In March 2020, a joint statement was issued by federal and state regulatory agencies, after consultation with the FASB, to clarify that short-term loan modifications are not TDRs if made on a good-faith basis in response to COVID-19 to borrowers who were current prior to any relief. Under this guidance, six months is provided as an example of short-term, and current is defined as less than 30 days past due at the time the modification program is implemented. The guidance also provides that these modified loans generally will not be classified as nonaccrual during the term of the modification. For borrowers who are 30 days or more past due when enrolling in a loan modification program related to the COVID-19 pandemic, we evaluate the loan modifications under our existing TDR framework, and where such a loan modification would result in a concession to a borrower experiencing financial difficulty, the loan will be accounted for as a TDR and will generally not accrue interest. Total commitments to lend additional funds to borrowers whose terms had been modified in a TDR were $16 million and $17 million at June 30, 2020 , and December 31, 2019, respectively. Refer to Note 1 for additional information. The following tables present information related to finance receivables and loans recorded at amortized cost modified in connection with a TDR during the period. 2020 2019 Three months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive (a) 21,293 $ 323 $ 297 5,598 $ 96 $ 85 Consumer mortgage Mortgage Finance (b) 19 11 11 2 — — Mortgage — Legacy (c) 23 3 3 18 3 3 Total consumer mortgage 42 14 14 20 3 3 Total consumer 21,335 337 311 5,618 99 88 Commercial Commercial and industrial Automotive 2 31 26 — — — Other 1 23 7 1 22 6 Total commercial 3 54 33 1 22 6 Total consumer and commercial finance receivables and loans 21,338 $ 391 $ 344 5,619 $ 121 $ 94 (a) Includes 13,615 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $191 million at June 30, 2020. (b) Includes 19 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $11 million at June 30, 2020. (c) Includes 20 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $2 million at June 30, 2020. 2020 2019 Six months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive (a) 44,093 $ 663 $ 615 13,025 $ 225 $ 196 Consumer mortgage Mortgage Finance (b) 29 15 15 3 — — Mortgage — Legacy (c) 55 7 7 38 6 6 Total consumer mortgage 84 22 22 41 6 6 Total consumer 44,177 685 637 13,066 231 202 Commercial Commercial and industrial Automotive 3 38 33 6 41 41 Other 1 23 7 1 22 6 Total commercial 4 61 40 7 63 47 Total consumer and commercial finance receivables and loans 44,181 $ 746 $ 677 13,073 $ 294 $ 249 (a) Includes 30,382 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $429 million at June 30, 2020. (b) Includes 27 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $14 million at June 30, 2020. (c) Includes 35 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $4 million at June 30, 2020. The following tables present information about finance receivables and loans recorded at amortized cost that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2020 2019 Three months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 1,119 $ 11 $ 8 1,752 $ 20 $ 12 Total consumer finance receivables and loans 1,119 $ 11 $ 8 1,752 $ 20 $ 12 2020 2019 Six months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 2,283 $ 24 $ 17 3,961 $ 46 $ 28 Total consumer finance receivables and loans 2,283 $ 24 $ 17 3,961 $ 46 $ 28

Leasing

Leasing	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	Leasing Ally as the Lessee We have operating leases for our corporate facilities, which have remaining lease terms of 2 months to 9 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 3 months to 15 years. Some of those lease agreements also include options to terminate the leases in periods that range from 2 to 6 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. We also have operating leases for a fleet of vehicles that is used by our sales force for business purposes, with noncancelable lease terms of 367 days. Thereafter, the leases are month-to-month, up to a maximum of 48 months from inception. The following table details our total investment in operating leases. ($ in millions) June 30, 2020 December 31, 2019 Assets Operating lease right-of-use assets (a) $ 137 $ 168 Liabilities Operating lease liabilities (b) $ 163 $ 196 (a) Included in other assets on our Condensed Consolidated Balance Sheet . (b) Included in accrued expenses and other liabilities on our Condensed Consolidated Balance Sheet . During the three months and six months ended June 30, 2020 , we paid $12 million and $25 million , respectively, in cash for amounts included in the measurement of lease liabilities at June 30, 2020 , compared to $13 million and $25 million for the three months and six months ended June 30, 2019 , in cash for amounts included in the measurement of lease liabilities at June 30, 2019 . These amounts are included in net cash provided by operating activities in the Condensed Consolidated Statement of Cash Flows . During the six months ended June 30, 2020 , and June 30, 2019 , we obtained $43 million and $34 million of ROU assets in exchange for new lease liabilities, respectively. As of June 30, 2020 , the weighted-average remaining lease term of our operating lease portfolio was 6 years, and the weighted-average discount rate was 2.64% , compared to 7 years and 2.97% as of June 30, 2019 . The following table presents future minimum rental payments we are required to make under operating leases that have commenced as of June 30, 2020 , and that have noncancelable lease terms expiring after June 30, 2020 . ($ in millions) 2020 $ 25 2021 43 2022 30 2023 20 2024 13 2025 and thereafter 46 Total undiscounted cash flows 177 Difference between undiscounted cash flows and discounted cash flows (14 ) Total lease liability $ 163 In May 2020, we purchased an operations center in Jacksonville, Florida, which consists of two facilities previously leased by us. Commensurate with the closing of the transaction, the lease ROU asset and liability was derecognized and new fixed assets totaling approximately $48 million were recognized. 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 $290 million in undiscounted future lease payments over the 15 -year term of the lease. We also have an option to purchase this facility after construction is completed, subject to certain terms and conditions. The following table details the components of total net operating lease expense. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Operating lease expense $ 11 $ 12 $ 24 $ 23 Variable lease expense 2 2 4 4 Total lease expense, net (a) $ 13 $ 14 $ 28 $ 27 (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 accordingly our consumer leases are classified as operating leases. 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. Additionally, lease modifications made related to the COVID-19 pandemic are not considered a new lease contract, and the remaining lease payments will be recorded on a straight-line basis over the modified lease term. To support our customers and help mitigate lease residual risk, we have deferred lease payments without fees for up to 120 days for any consumer requesting assistance related to the COVID-19 pandemic. Approximately 55,000 of our lease customers have enrolled in this lease modification program, and approximately 60% were granted a 120-day deferral at the time of enrollment. As of June 30, 2020, approximately 38,000 or 11% of our lease customers were enrolled in the lease modification program. We have also provided a program for and, in some cases, incentivized customers nearing their scheduled lease-end dates to extend their leases for up to an additional 180 days. Eligible customers who opted into this program during the early part of the second quarter were not charged for the first month of the extension, and the following months of the extended lease were offered under the terms of the existing lease contract. As of June 30, 2020, approximately 6,900 customers had opted into an extension requiring additional payments. 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 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, 2020 , and December 31, 2019 , consumer operating leases with a carrying value, net of accumulated depreciation, of $411 million and $352 million , respectively, were covered by a residual value guarantee of 15% of the manufacturer’s suggested retail price. The following table details our investment in operating leases. ($ in millions) June 30, 2020 December 31, 2019 Vehicles $ 10,656 $ 10,426 Accumulated depreciation (1,568 ) (1,562 ) Investment in operating leases, net $ 9,088 $ 8,864 The following table presents future minimum rental payments we have the right to receive under operating leases with noncancelable lease terms expiring after June 30, 2020 . ($ in millions) 2020 $ 722 2021 1,114 2022 635 2023 228 2024 26 2025 and thereafter 1 Total lease payments from operating leases $ 2,726 We recognized operating lease revenue of $343 million and $710 million , and $363 million and $724 million for the three months and six months ended June 30, 2020 , and June 30, 2019 , respectively. Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Depreciation expense on operating lease assets (excluding remarketing losses and gains) (a) $ 241 $ 262 $ 491 $ 523 Remarketing losses (gains), net 11 (23 ) 9 (38 ) Net depreciation expense on operating lease assets $ 252 $ 239 $ 500 $ 485 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles of $5 million and $12 million during the three months and six months ended June 30, 2020 , respectively, and $5 million and $9 million during the three months and six months ended June 30, 2019 . 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 $455 million and $472 million as of June 30, 2020 , and December 31, 2019 , respectively. This includes lease payment receivables of $442 million and $459 million at June 30, 2020 , and December 31, 2019 , respectively, and unguaranteed residual assets of $13 million at both June 30, 2020 , and December 31, 2019 . Interest income on finance lease receivables was $5 million and $11 million for the three and six months ended June 30, 2020 , respectively, and $6 million and $12 million for the three and six months ended June 30, 2019 , and is included in interest and fees on finance receivables and loans in our Condensed Consolidated Statement of Comprehensive Income . The following table presents future minimum rental payments we have the right to receive under finance leases with noncancelable lease terms expiring after June 30, 2020 . ($ in millions) 2020 $ 75 2021 149 2022 112 2023 78 2024 46 2025 and thereafter 31 Total undiscounted cash flows 491 Difference between undiscounted cash flows and discounted cash flows (49 ) Present value of lease payments recorded as lease receivable $ 442

Securitizations and Variable In

Securitizations and Variable Interest Entities	6 Months Ended
	Jun. 30, 2020
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 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 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, 2020 , and June 30, 2019 . 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 2019 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, 2020 On-balance sheet variable interest entities Consumer automotive $ 19,760 (b) $ 4,431 (c) Commercial automotive 6,257 2,150 Off-balance-sheet variable interest entities Consumer automotive 15 (d) — $ 276 $ 290 (e) Commercial other 1,170 (f) 402 (g) — 1,478 (h) Total $ 27,202 $ 6,983 $ 276 $ 1,768 December 31, 2019 On-balance sheet variable interest entities Consumer automotive $ 20,376 (b) $ 6,070 (c) Commercial automotive 8,009 3,049 Off-balance-sheet variable interest entities Consumer automotive (i) 23 (d) — $ 417 $ 440 (e) Commercial other 1,079 (f) 378 (g) — 1,397 (h) Total $ 29,487 $ 9,497 $ 417 $ 1,837 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $9.4 billion and $9.0 billion of assets that were not encumbered by VIE beneficial interests held by third parties at June 30, 2020 , and December 31, 2019 , respectively. Ally or consolidated affiliates hold the interests in these assets. (c) Includes $82 million and $21 million of liabilities that were not obligations to third-party beneficial interest holders at June 30, 2020 , and December 31, 2019 , respectively. (d) Represents retained notes and certificated residual interests, of which $13 million and $21 million were classified as held-to-maturity securities at June 30, 2020 , and December 31, 2019 , respectively, and $2 million were classified as other assets at both June 30, 2020 , and December 31, 2019 . 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, warranty, and covenant 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 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. (i) During the year ended December 31, 2019 , we indicated our intent to exercise a clean-up call option related to a nonconsolidated securitization-related VIE. The option enables us to repurchase the remaining transferred financial assets at our discretion once the asset pool declines to a predefined level and redeem the related outstanding debt. As a result of this event, we became the primary beneficiary of the VIE, which included $48 million of consumer automotive loans and $45 million of related debt, and the VIE was consolidated on our Condensed Consolidated Balance Sheet. The related amounts were removed from assets sold to nonconsolidated VIEs and maximum exposure to loss in nonconsolidated VIEs. Cash Flows with Off-Balance-Sheet Securitization Entities The following table summarizes cash flows received and paid related to SPEs and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred consumer automotive assets (for example, servicing) that were outstanding during the six months ended June 30, 2020 , and 2019 . Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated SPEs that existed during each period. Six months ended June 30, ($ in millions) Consumer automotive 2020 Cash flows received on retained interests in securitization entities $ 8 Servicing fees 2 Cash disbursements for repurchases during the period (2 ) 2019 Cash flows received on retained interests in securitization entities $ 13 Servicing fees 6 Cash disbursements for repurchases during the period (1 ) 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, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Off-balance-sheet securitization entities Consumer automotive $ 276 $ 417 $ 5 $ 6 Whole-loan sales (a) Consumer automotive 103 207 1 2 Total $ 379 $ 624 $ 6 $ 8 (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) 2020 2019 2020 2019 Off-balance-sheet securitization entities Consumer automotive $ — $ 2 $ 1 $ 4 Whole-loan sales (a) Consumer automotive — 1 — 1 Total $ — $ 3 $ 1 $ 5 (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, 2020
Other Assets [Abstract]
Other Assets Disclosure	Other Assets The components of other assets were as follows. ($ in millions) June 30, 2020 December 31, 2019 Property and equipment at cost $ 1,433 $ 1,332 Accumulated depreciation (748 ) (686 ) Net property and equipment 685 646 Accrued interest, fees, and rent receivables 1,125 589 Nonmarketable equity investments (a) 1,080 1,232 Investment in qualified affordable housing projects (b) 930 830 Restricted cash held for securitization trusts (c) 760 738 Equity-method investments (d) 361 358 Goodwill 343 393 Net deferred tax assets 161 58 Other accounts receivable (e) 150 117 Restricted cash and cash equivalents (f) 73 87 Net intangible assets (g) 60 69 Fair value of derivative contracts in receivable position (h) 14 64 Other assets 979 892 Total other assets $ 6,721 $ 6,073 (a) Includes investments in FHLB stock of $551 million and $701 million at June 30, 2020 , and December 31, 2019 , respectively; FRB stock of $449 million at both June 30, 2020 , and December 31, 2019 ; and equity securities without a readily determinable fair value of $80 million and $82 million at June 30, 2020 , and December 31, 2019 , respectively, measured at cost with adjustments for impairment and observable changes in price. During the three and six months ended June 30, 2020 , we recorded $4 million and $5 million of impairments and downward adjustments related to equity securities without a readily determinable fair value, respectively. Through June 30, 2020 , we recorded $10 million of cumulative upward adjustments and $11 million of cumulative impairments and downward adjustments related to equity securities without a readily determinable fair value held at June 30, 2020 . (b) Investment in qualified affordable housing projects are accounted for using the proportional amortization method of accounting and include $397 million and $372 million of unfunded commitments to provide additional capital contributions to investees at June 30, 2020 , and December 31, 2019 , respectively. Substantially all of the unfunded commitments at June 30, 2020 , 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 CRA program. (e) Primarily represents the proceeds from the sale of investment securities that have not settled as of the balance sheet date. (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) Includes gross intangible assets of $111 million at both June 30, 2020 , and December 31, 2019 , and accumulated amortization of $51 million and $42 million at June 30, 2020 , and December 31, 2019 , respectively. (h) For additional information on derivative instruments and hedging activities, refer to Note 18 . The carrying balance of goodwill by reportable operating segment was as follows. ($ in millions) Automotive Finance operations Insurance operations Corporate and Other (a) Total Goodwill at December 31, 2019 $ 20 $ 27 $ 346 $ 393 Impairment losses — — (50 ) (50 ) Goodwill at June 30, 2020 $ 20 $ 27 $ 296 $ 343 (a) Includes $153 million of goodwill arising from the acquisition of Health Credit Services at both June 30, 2020 , and December 31, 2019 , and $143 million and $193 million of goodwill associated with Ally Invest at June 30, 2020 , and December 31, 2019 , respectively. For additional information on the acquisition of Health Credit Services, refer to Note 2 . During the three months ended June 30, 2020, we recognized a $50 million impairment of goodwill at Ally Invest. The recognition of this impairment was the result of certain business developments that impacted the expected growth and timing of revenue at Ally Invest, which constituted a triggering event for goodwill testing purposes. We used a combination of valuation methodologies, including discounted cash flow and comparable transaction analyses, to determine the fair market value of Ally Invest as of the April 30, 2020 valuation date and determined that the carrying value exceeded fair market value, resulting in the impairment charge.

Deposit Liabilities

Deposit Liabilities	6 Months Ended
	Jun. 30, 2020
Deposits [Abstract]
Deposit Liabilities Disclosures	Deposit Liabilities Deposit liabilities consisted of the following. ($ in millions) June 30, 2020 December 31, 2019 Noninterest-bearing deposits $ 134 $ 119 Interest-bearing deposits Savings and money-market checking accounts 72,561 62,486 Certificates of deposit 58,340 58,146 Other deposits 1 1 Total deposit liabilities $ 131,036 $ 120,752 At June 30, 2020 , and December 31, 2019 , certificates of deposit included $27.0 billion and $25.6 billion , respectively, of those in denominations of $100 thousand or more. At June 30, 2020 , and December 31, 2019 , certificates of deposit included $8.7 billion and $8.2 billion , respectively, of those in denominations in excess of $250 thousand federal insurance limits.

Debt

Debt	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Debt Disclosure	Debt Short-Term Borrowings The following table presents the composition of our short-term borrowings portfolio. June 30, 2020 December 31, 2019 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes $ 2,510 $ — $ 2,510 $ 2,581 $ — $ 2,581 Federal Home Loan Bank — 1,100 1,100 — 2,950 2,950 Securities sold under agreements to repurchase — 79 79 — — — Total short-term borrowings $ 2,510 $ 1,179 $ 3,689 $ 2,581 $ 2,950 $ 5,531 (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, 2020 , the securities sold under agreements to repurchase consisted of $79 million of agency mortgage-backed residential debt securities set to mature within 30 days. Refer to Note 7 and Note 21 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, 2020 , we placed cash collateral of $11 million , and we did not receive any collateral. At December 31, 2019, we did not place or receive any collateral. Long-Term Debt The following table presents the composition of our long-term debt portfolio. June 30, 2020 December 31, 2019 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt (a) Due within one year $ 1,063 $ 7,642 $ 8,705 $ 2,214 $ 7,005 $ 9,219 Due after one year 10,146 10,325 20,471 8,990 15,818 24,808 Total long-term debt (b) (c) $ 11,209 $ 17,967 $ 29,176 $ 11,204 $ 22,823 $ 34,027 (a) Includes basis adjustments related to the application of hedge accounting. (b) Includes $2.6 billion of trust preferred securities at both June 30, 2020 , and December 31, 2019 . (c) Includes advances net of hedge basis adjustment from the FHLB of Pittsburgh of $11.5 billion and $13.3 billion at June 30, 2020 , and December 31, 2019 , respectively. The following table presents the scheduled remaining maturity of long-term debt at June 30, 2020 , assuming no early redemptions will occur. The amounts below include adjustments to the carrying value resulting from the application of hedge accounting. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2020 2021 2022 2023 2024 2025 and thereafter Total Unsecured Long-term debt $ 474 $ 701 $ 1,123 $ 865 $ 1,475 $ 7,663 $ 12,301 Original issue discount (25 ) (53 ) (57 ) (63 ) (69 ) (825 ) (1,092 ) Total unsecured 449 648 1,066 802 1,406 6,838 11,209 Secured Long-term debt 2,571 9,253 5,435 588 102 18 17,967 Total long-term debt $ 3,020 $ 9,901 $ 6,501 $ 1,390 $ 1,508 $ 6,856 $ 29,176 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, 2020 December 31, 2019 ($ in millions) Total (a) Ally Bank Total (a) Ally Bank Investment securities (b) $ 72 $ 72 $ 2,698 $ 2,698 Mortgage assets held-for-investment and lending receivables 17,256 17,256 17,135 17,135 Consumer automotive finance receivables 12,341 11,490 13,481 11,534 Commercial automotive finance receivables 10,921 10,921 12,890 12,890 Total assets restricted as collateral (c) (d) $ 40,590 $ 39,739 $ 46,204 $ 44,257 Secured debt $ 19,146 (e) $ 18,410 $ 25,773 (e) $ 24,069 (a) Ally Bank is a component of the total column. (b) A portion of the restricted investment securities at June 30, 2020 , was 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 $22.1 billion and $24.8 billion at June 30, 2020 , and December 31, 2019 , 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, 2020 , and December 31, 2019 . 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 11 for additional information. (e) Includes $1.2 billion and $3.0 billion of short-term borrowings at June 30, 2020 , and December 31, 2019 , respectively. Trust Preferred Securities At both June 30, 2020 , and December 31, 2019 , we had issued and outstanding approximately $2.6 billion in aggregate liquidation preference of 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. The Series 2 TRUPS were issued prior to October 4, 2010, under the Emergency Economic Stabilization Act of 2008 and are not subject to phase-out from additional Tier 1 capital into Tier 2 capital. The amount of Series 2 TRUPS included in Ally’s Tier 1 capital was $2.5 billion at June 30, 2020 . The amount represents the carrying amount of the Series 2 TRUPS less our common stock investment in the trust. 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 . 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, 2020 , all of our $1.6 billion of capacity was revolving and of this balance, $550 million was from facilities with a remaining tenor greater than 364 days. Committed Secured Credit Facilities Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Parent funding Secured $ — $ 450 $ 1,550 $ 2,050 $ 1,550 $ 2,500 Total committed secured credit facilities $ — $ 450 $ 1,550 $ 2,050 $ 1,550 $ 2,500 (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, 2020
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, 2020 December 31, 2019 Accounts payable $ 904 $ 535 Unfunded commitments for investment in qualified affordable housing projects 397 372 Employee compensation and benefits 229 296 Reserves for insurance losses and loss adjustment expenses 132 122 Deferred revenue 76 36 Net deferred tax liabilities 24 67 Cash collateral received from counterparties 12 48 Fair value of derivative contracts in payable position (a) 2 5 Other liabilities 523 491 Total accrued expenses and other liabilities $ 2,299 $ 1,972 (a) For additional information on derivative instruments and hedging activities, refer to Note 18 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	6 Months Ended
	Jun. 30, 2020
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss) Note	Accumulated Other Comprehensive Income (Loss) The following tables present changes, net of tax, in each component of accumulated other comprehensive income (loss). 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 income (loss) 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 Balance at April 1, 2020 $ 661 $ 18 $ 130 $ (103 ) $ 706 Net change 122 1 (14 ) — 109 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103 ) $ 815 (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 18 . 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 income (loss) Balance at December 31, 2018 $ (481 ) $ 18 $ 19 $ (95 ) $ (539 ) Cumulative effect of changes in accounting principles, net of tax Adoption of Accounting Standards Update 2017-08 (c) 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 Balance at December 31, 2019 $ 208 $ 19 $ 2 $ (106 ) $ 123 Net change 575 — 114 3 692 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103 ) $ 815 (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 18 . (c) Refer to the section titled Recently Adopted Accounting Standards in Note 1 to the Consolidated Financial Statements in our 2019 Annual Report on Form 10-K 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, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 175 $ (38 ) $ 137 Less: Net realized gains reclassified to income from continuing operations 19 (a) (4 ) (b) 15 Net change 156 (34 ) 122 Translation adjustments Net unrealized gains arising during the period 6 (1 ) 5 Net investment hedges (c) Net unrealized losses arising during the period (5 ) 1 (4 ) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 19 (5 ) 14 Other comprehensive income $ 138 $ (29 ) $ 109 (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 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 18 . 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 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 18 . Six months ended June 30, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 877 $ (206 ) $ 671 Less: Net realized gains reclassified to income from continuing operations 124 (a) (28 ) (b) 96 Net change 753 (178 ) 575 Translation adjustments Net unrealized losses arising during the period (7 ) 2 (5 ) 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 169 (41 ) 128 Less: Net realized gains reclassified to income from continuing operations 19 (5 ) 14 Net change 150 (36 ) 114 Defined benefit pension plans Net unrealized gains arising during the period 4 (1 ) 3 Other comprehensive income $ 907 $ (215 ) $ 692 (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 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 18 . 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 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 18 .

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2020
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) 2020 2019 2020 2019 Net income (loss) from continuing operations $ 242 $ 584 $ (77 ) $ 959 Loss from discontinued operations, net of tax (1 ) (2 ) (1 ) (3 ) Net income (loss) attributable to common stockholders $ 241 $ 582 $ (78 ) $ 956 Basic weighted-average common shares outstanding (b) 375,051 398,100 375,387 401,098 Diluted weighted-average common shares outstanding (b) (c) 375,762 399,916 375,387 402,921 Basic earnings per common share Net income (loss) from continuing operations $ 0.65 $ 1.47 $ (0.20 ) $ 2.39 Loss from discontinued operations, net of tax — — — (0.01 ) Net income (loss) $ 0.64 $ 1.46 (0.21 ) 2.39 Diluted earnings per common share Net income (loss) from continuing operations $ 0.64 $ 1.46 (0.20 ) 2.38 Loss from discontinued operations, net of tax — — — (0.01 ) Net income (loss) $ 0.64 $ 1.46 $ (0.21 ) $ 2.37 (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 . (c) Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share . During the three months and six months ended June 30, 2020, there were 2.3 million and 2.4 million , respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and six months ended June 30, 2019.

Regulatory Capital and Other Re

Regulatory Capital and Other Regulatory Matters	6 Months Ended
	Jun. 30, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Capital Requirements under Banking Regulations	Regulatory Capital and Other Regulatory Matters Basel Capital Framework 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. 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. The risk-based capital ratios are based on a banking organization’s 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. 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, Ally 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. In October 2019, the FRB and other U.S. banking agencies issued final rules implementing targeted amendments to the Dodd-Frank Act and other financial-services laws that had been enacted in May 2018 through the EGRRCP Act. The final rules were effective on December 31, 2019 , and established four risk-based categories of prudential standards and capital and liquidity requirements for banking organizations with $100 billion or more in total consolidated assets. Under the final rules, Ally was designated as a Category IV firm and, as such, is subject to supervisory stress testing on a two-year cycle, allowed to continue excluding accumulated other comprehensive income from regulatory capital, exempted from company-run capital stress testing, and allowed to remain exempted from the supplementary leverage ratio and the countercyclical capital buffer. Refer to Note 20 to the Consolidated Financial Statements in our 2019 Annual Report on Form 10-K for additional details on our prudential standards tailoring framework and other capital and liquidity requirements we are subject to. 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 requirement that is currently fixed at 2.5% . Failure to maintain more than the full amount of the capital conservation buffer requirement 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% . In March 2020, the FRB issued a final rule to more closely align forward-looking stress testing results with the FRB’s non-stress regulatory capital requirements for BHCs with $100 billion or more in total consolidated assets and other specified companies. The final rule introduces a stress capital buffer requirement based on firm-specific stress test performance and planned dividends, which will replace the fixed 2.5% component of the capital conservation buffer requirement. The final rule also makes 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, assuming that a firm maintains a constant level of assets over the planning horizon, eliminating the 30% dividend payout ratio as a criterion for heightened scrutiny of a firm’s capital plan, and allowing a firm to make capital distributions in excess of those included in its capital plan if the firm is otherwise in compliance with the automatic distribution limits of the capital framework. The final rule became effective on May 18, 2020, and therefore applied to the 2020 CCAR process. For a Category IV firm like Ally, the stress capital buffer requirement will comprise its capital conservation buffer requirement. Ally’s stress capital buffer requirement will be the greater of 2.5% and the result of the following calculation: (1) the difference between Ally’s starting and minimum projected Common Equity Tier 1 capital ratios under the severely adverse scenario in the supervisory stress test, plus (2) the sum of the dollar amount of Ally’s planned common stock dividends for each of the fourth through seventh quarters of its nine-quarter capital planning horizon, as a percentage of risk-weighted assets. Ally received its first preliminary stress capital buffer requirement from the FRB on June 25, 2020, which was determined under this new methodology to be 3.5% and is scheduled to become effective on October 1, 2020. At the same time, the FRB announced its determination that changes in financial markets or the macroeconomic outlook could have a material effect on the risk profiles and financial conditions of firms subject to the capital-plan rule and that, as a result, the firms (including Ally) would be required to resubmit capital plans to the FRB within 45 days after receiving updated stress scenarios from the FRB. It is possible that this resubmission process may result in a change in Ally’s stress capital buffer requirement. Ally Bank’s capital conservation buffer requirement will continue to be a fixed 2.5% . Under the capital conservation buffer requirement, the maximum amount of capital distributions and discretionary bonus payments that can be made by a banking organization, such as Ally or Ally Bank, is a function of its eligible retained income. During the COVID-19 pandemic, the FRB and other U.S. banking agencies expressed a concern that the definition of eligible retained income would not limit distributions in the gradual manner intended but instead could do so in a sudden and severe manner even if a banking organization were to experience only a modest reduction in its capital ratios. As a result, to better allow a banking organization to use its capital buffer as intended and continue lending in adverse conditions, the U.S. banking agencies issued an interim final rule that became effective on March 20, 2020, and revised the definition of eligible retained income to the greater of (1) a banking organization’s net income for the four preceding calendar quarters, net of any distributions and associated tax effects not already reflected in net income, and (2) the average of a banking organization’s net income over the preceding four quarters. 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. The following table summarizes our capital ratios under the U.S. Basel III capital framework. June 30, 2020 December 31, 2019 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. $ 13,826 10.09 % $ 13,837 9.54 % 4.50 % (b) Ally Bank 16,918 13.21 16,627 12.30 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 16,235 11.85 % $ 16,271 11.22 % 6.00 % 6.00 % Ally Bank 16,918 13.21 16,627 12.30 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 18,895 13.79 % $ 18,506 12.76 % 8.00 % 10.00 % Ally Bank 18,522 14.46 17,854 13.21 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (c) Ally Financial Inc. $ 16,235 8.93 % $ 16,271 9.08 % 4.00 % (b) Ally Bank 16,918 9.94 16,627 10.01 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% at both June 30, 2020 , and December 31, 2019 . Beginning October 1, 2020, Ally’s preliminary stress capital buffer requirement of 3.5% will comprise its capital conservation buffer requirement. Ally’s capital conservation buffer was 5.59% and 4.76% at June 30, 2020 , and December 31, 2019 , 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. 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 three-year period. In March 2020, the FRB and other U.S. banking agencies issued an interim final rule that became effective on March 31, 2020, and that provides BHCs and banks with an alternative option to temporarily delay an estimate of the impact of CECL, relative to the incurred loss methodology for estimating the allowance for loan losses, on regulatory capital. We have elected this alternative option instead of the one described in the December 2018 rule. As a result, under the interim final rule, we will delay recognizing the estimated impact of CECL on regulatory capital until after a two-year deferral period, which for us extends through December 31, 2021. Beginning on January 1, 2022, we will be required to phase in 25% of the previously deferred estimated capital impact of CECL, with an additional 25% to be phased in at the beginning of each subsequent year until fully phased in by the first quarter of 2025. Under the interim final rule, the estimated impact of CECL on regulatory capital that we will defer and later phase in is calculated as the entire day-one impact at adoption plus 25% of the subsequent change in allowance during the two-year deferral period. As of June 30, 2020, the total deferred impact on Common Equity Tier 1 capital related to our adoption of CECL was $1.2 billion . At June 30, 2020 , and December 31, 2019 , Ally and Ally Bank were “well-capitalized” and met all applicable capital requirements to which each was subject. Compliance with capital requirements is a strategic priority for Ally. We expect to be in compliance with all applicable requirements within the established timeframes. Other Regulatory Developments In July 2019, the FRB and other U.S. banking agencies issued a final rule to simplify the capital treatment for MSAs, certain DTAs, and investments in the capital instruments of unconsolidated financial institutions (collectively, threshold items). Prior to the final rule taking effect, banking organizations deducted from 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 exceeded 15% of Common Equity Tier 1 capital minus certain deductions from and adjustments to Common Equity Tier 1 capital were also deducted. Any amount of these MSAs and certain DTAs not deducted from Common Equity Tier 1 capital were risk weighted at 100% . The final rule removed the individual and aggregate deduction thresholds for threshold items and adopted a single 25% Common Equity Tier 1 capital deduction threshold for each item individually, and required that any of the threshold items not deducted be risk weighted at 250% . The final rule also simplified the calculation methodology for minority interests. These provisions took effect for us on April 1, 2020, and did not have a material impact on our capital position. In December 2017, the Basel Committee on Banking Supervision 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. In March 2020, to better allow banking organizations to focus their resources on navigating the COVID-19 pandemic, the implementation date of these revisions was delayed by the Basel Committee from January 1, 2022, to January 1, 2023. At this time, how the revisions will be harmonized and finalized in the United States is not clear or predictable, and we continue to evaluate the impacts that these revisions may have on us. Refer to in Note 20 to the Consolidated Financial Statements in our 2019 Annual Report on Form 10-K for further discussion about other regulatory developments. Capital Planning and Stress Tests As a Category IV firm, we are subject to supervisory stress testing on a two-year cycle and are exempted from company-run capital stress testing. We are also required to submit an annual capital plan to the FRB. Our annual 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 our capital. The plan must also include a discussion of how we, under expected and stressful conditions, will maintain capital commensurate with our risks and above the minimum regulatory capital ratios, and will serve as a source of strength to Ally Bank. The FRB’s final rule introducing the stress capital buffer requirement, which is described above in the section titled Basel Capital Framework , makes several changes to the CCAR process that applied beginning with the 2020 cycle. 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) (b) Number of common shares outstanding Cash dividends declared per common share (c) ($ in millions, except per share data; shares in thousands) Approximate dollar value Number of shares Beginning of period End of period 2019 First quarter $ 211 8,113 404,900 399,761 $ 0.17 Second quarter 229 7,775 399,761 392,775 0.17 Third quarter 300 9,287 392,775 383,523 0.17 Fourth quarter 299 9,554 383,523 374,332 0.17 2020 First quarter $ 104 3,838 374,332 373,155 $ 0.19 Second quarter — 53 373,155 373,837 0.19 (a) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans. (b) On March 17, 2020, we announced the voluntary suspension of our stock-repurchase program through its termination on June 30, 2020. We do not currently plan to implement a new stock-repurchase program or repurchase shares of our common stock, except in connection with compensation plans, for the remainder of 2020. Refer to the discussion below for further details about this action. (c) On July 14, 2020 , our Board declared a quarterly cash dividend of $0.19 per share on all common stock, payable on August 14, 2020 , to stockholders of record at the close of business on July 31, 2020 . Refer to Note 24 for further information regarding this common stock dividend. We received a non-objection to our 2018 capital plan in June 2018. We were not required to submit an annual capital plan to the FRB, participate in the supervisory stress test or CCAR, or conduct company-run capital stress tests during the 2019 cycle. Instead, our capital actions during the 2019 cycle were largely based on the results from our 2018 supervisory stress test. On April 1, 2019, our 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. On March 17, 2020, in order to support the FRB's effort to mitigate the impact of the COVID-19 pandemic on the U.S. economy and the financial system, we announced the voluntary suspension of our stock-repurchase program through its termination on June 30, 2020. We do not currently plan to implement a new stock-repurchase program or repurchase shares of our common stock, except in connection with compensation plans, for the remainder of 2020. We retain the discretion, however, to implement such a program and repurchase common stock, subject to the FRB’s restrictions as summarized below. On July 14, 2020 , our Board declared a quarterly cash dividend of $0.19 per share of our common stock. Refer to Note 24 for further information on the most recent dividend. We submitted our 2020 capital plan on April 3, 2020, which included planned capital distributions to common stockholders through share repurchases and cash dividends over the nine-quarter planning horizon. On June 25, 2020, the FRB provided us with the results of the supervisory stress test, additional industry-wide sensitivity analyses conducted in light of the COVID-19 pandemic, and our preliminary stress capital buffer requirement. At the same time, the FRB announced its determination that changes in financial markets or the macroeconomic outlook could have a material effect on the risk profiles and financial conditions of firms subject to the capital-plan rule and that, as a result, the firms (including Ally) would be required to resubmit capital plans to the FRB within 45 days after receiving updated stress scenarios from the FRB. The FRB also announced several actions to ensure that large firms such as Ally remain resilient despite the economic uncertainty from the COVID-19 pandemic, including for the third quarter of 2020 (1) the suspension of repurchases by any firm of its common stock, except repurchases relating to issuances of common stock related to employee stock ownership plans, and (2) the disallowance of any increase by a firm in the amount of its common-stock dividends and the imposition of a common-stock dividend limit equal to the average of the firm’s net income for the four preceding calendar quarters. These restrictions for the third quarter of 2020 may be extended by the FRB on a quarter-by-quarter basis. 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 internal governance requirements, including approval by our 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, impacts related to the COVID-19 pandemic, 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 or resumed at any time.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2020
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 swaps, foreign-currency forwards, equity options, futures, and interest rate 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 (which do not qualify for hedge accounting treatment). Derivatives qualifying for hedge accounting treatment 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 execute economic hedges, which may 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 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 or expense offsetting the gains and losses on the associated foreign-currency transactions. Investment Risk We enter into equity options to mitigate the risk associated with 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 OTC derivatives such as interest rate caps and floors 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 six months ended June 30, 2020 , or 2019 . We placed cash and noncash collateral totaling $2 million and $143 million , respectively, supporting our derivative positions at June 30, 2020 , compared to $118 million of noncash collateral at December 31, 2019 , 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 13 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 collateral from counterparties totaling $2 million in accounts maintained by counterparties at June 30, 2020 , compared to $40 million and $29 million of cash and noncash collateral at December 31, 2019 . These amounts include collateral received from clearinghouses and exclude cash and noncash collateral pledged under repurchase agreements. Refer to Note 13 for details on repurchase agreements. The payables for cash collateral received are included on our Condensed Consolidated Balance Sheet in accrued expenses and other liabilities. Included in these amounts is noncash collateral where we have been granted the right to sell or pledge the underlying assets. We have not sold or pledged any of the noncash collateral received under these agreements. Balance Sheet Presentation The following table summarizes the amounts of derivative instruments reported on our Condensed Consolidated Balance Sheet . The amounts are presented on a gross basis, are segregated by derivatives that are designated and qualifying as hedging instruments or those that are not, and are further segregated by type of contract within those two categories. Derivative contracts in a receivable and payable position exclude open trade equity on derivatives cleared through central clearing counterparties. Any associated collateral exchanged with our central clearing counterparties are treated as settlements of the derivative exposure, rather than collateral. Such payments are recognized as settlements of the derivatives contracts in a receivable and payable position on our Condensed Consolidated Balance Sheet . Notional amounts are reference amounts from which contractual obligations are derived and are not recorded on the balance sheet. In our view, derivative notional is not an accurate measure of our derivative exposure when viewed in isolation from other factors, such as market rate fluctuations and counterparty credit risk. June 30, 2020 December 31, 2019 Derivative contracts in a Notional amount Derivative contracts in a Notional amount ($ in millions) receivable position payable position receivable position payable position Derivatives designated as accounting hedges Interest rate contracts Swaps $ — $ — $ 11,215 $ — $ — $ 17,101 Purchased options — — — 62 — 14,100 Foreign exchange contracts Forwards — — 145 — 3 157 Total derivatives designated as accounting hedges — — 11,360 62 3 31,358 Derivatives not designated as accounting hedges Interest rate contracts Futures and forwards — — 117 — — 81 Written options 12 — 445 2 — 522 Purchased options — — — — — 416 Total interest rate risk 12 — 562 2 — 1,019 Foreign exchange contracts Futures and forwards — — 157 — 2 112 Total foreign exchange risk — — 157 — 2 112 Equity contracts Written options — 2 1 — — — Purchased options 2 — 1 — — — Total equity risk 2 2 2 — — — Total derivatives not designated as accounting hedges 14 2 721 2 2 1,131 Total derivatives $ 14 $ 2 $ 12,081 $ 64 $ 5 $ 32,489 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, 2020 December 31, 2019 June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Assets Available-for-sale securities (b) (c) $ 1,270 $ 1,217 $ 50 $ 18 $ 32 $ 18 Finance receivables and loans, net (d) 36,211 33,312 334 135 79 44 Liabilities Long-term debt $ 10,020 $ 11,995 $ 196 $ 24 $ 196 $ 127 (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 and includes $597 million and $230 million at June 30, 2020 , and December 31, 2019 , respectively, related to 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. Refer to Note 7 for a reconciliation of the amortized cost and fair value of available-for-sale securities. (c) The amount that is identified as the last of layer in the open hedge relationship was $490 million as of June 30, 2020 . The basis adjustment associated with the open last of layer relationship was a $3 million asset as of June 30, 2020 , which would be allocated across the entire remaining 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 $690 million and $200 million as of June 30, 2020 , and December 31, 2019 , respectively. The basis adjustment associated with the discontinued last of layer relationship was a $22 million asset as of June 30, 2020 , and a $2 million asset as of December 31, 2019 , which was allocated across the entire remaining pool upon termination of the hedge relationship. There were no open last-of-layer relationships at December 31, 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 $10.2 billion at both June 30, 2020 , and December 31, 2019 . The basis adjustment associated with the open last-of-layer relationship was a $255 million asset as of June 30, 2020 , and a $91 million asset as of December 31, 2019 , 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 $17.5 billion at June 30, 2020 , and $12.8 billion at December 31, 2019 . The basis adjustment associated with the discontinued last-of-layer relationship was a $79 million asset and $43 million asset as of June 30, 2020 , and December 31, 2019 , respectively, which was allocated across the entire remaining pool upon termination of the hedge relationship. Statement of Comprehensive Income Presentation The following table summarizes the location and amounts of gains and losses on derivative instruments not designated as accounting hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 (Loss) gain recognized in earnings Interest rate contracts Gain on mortgage and automotive loans, net $ — $ — $ (15 ) $ 1 Other income, net of losses (23 ) (2 ) (23 ) (7 ) Total interest rate contracts (23 ) (2 ) (38 ) (6 ) Foreign exchange contracts Other income, net of losses (5 ) (2 ) 3 (3 ) Total foreign exchange contracts (5 ) (2 ) 3 (3 ) Total loss recognized in earnings $ (28 ) $ (4 ) $ (35 ) $ (9 ) 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 deposits Interest on long-term debt Three months ended June 30, ($ in millions) 2020 2019 2020 2019 2020 2019 2020 2019 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ — $ (19 ) Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — — 19 Hedged available-for-sale securities — — 4 2 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — (4 ) (2 ) — — — — Hedged fixed-rate consumer automotive loans (23 ) 98 — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans 23 (98 ) — — — — — — Total gain on fair value hedging relationships — — — — — — — — Gain (loss) on cash flow hedging relationships Interest rate contracts Hedged variable-rate commercial loans Reclassified from accumulated other comprehensive income into income 22 — — — — — — — Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — (2 ) — — — Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — — — — 4 Total gain (loss) on cash flow hedging relationships $ 22 $ — $ — $ — $ (2 ) $ — $ — $ 4 Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 1,630 $ 1,860 $ 197 $ 244 $ 541 $ 651 $ 318 $ 407 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) 2020 2019 2020 2019 2020 2019 2020 2019 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ (170 ) $ (19 ) Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — 170 19 Hedged available-for-sale securities — — 45 12 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — (45 ) (12 ) — — — — Hedged fixed-rate consumer automotive loans 225 141 — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans (225 ) (141 ) — — — — — — Total gain on fair value hedging relationships — — — — — — — — Gain (loss) on cash flow hedging relationships Interest rate contracts Hedged variable rate commercial loans Reclassified from accumulated other comprehensive income into income 25 — — — — — — — Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — (5 ) 1 — — Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — — — — 8 Total gain (loss) on cash flow hedging relationships $ 25 $ — $ — $ — $ (5 ) $ 1 $ — $ 8 Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 3,372 $ 3,667 $ 423 $ 484 $ 1,133 $ 1,243 $ 666 $ 826 During the next 12 months, we estimate $87 million of gains will be reclassified into pretax earnings from derivatives designated as cash flow hedges. The following tables summarize the location and amounts of gains and losses related to interest and amortization on derivative instruments designated as fair value and cash flow hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Interest and fees on finance receivables and loans Interest and dividends on investment securities and other earning assets Interest on long-term debt Three months ended June 30, ($ in millions) 2020 2019 2020 2019 2020 2019 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 2 $ 6 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (6 ) (5 ) Amortization of deferred basis adjustments of available-for-sale securities — — (2 ) (1 ) — — Interest for qualifying accounting hedges of available-for-sale securities — — (2 ) — — — Amortization of deferred loan basis adjustments (13 ) (9 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (38 ) 11 — — — — Total (loss) gain on fair value hedging relationships (51 ) 2 (4 ) (1 ) (4 ) 1 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) 2020 2019 2020 2019 2020 2019 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 8 $ 12 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (12 ) (11 ) Amortization of deferred basis adjustments of available-for-sale securities — — (3 ) (1 ) — — Interest for qualifying accounting hedges of available-for-sale securities — — (2 ) — — — Amortization of deferred loan basis adjustments (26 ) (13 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (47 ) 17 — — — — Total (loss) gain on fair value hedging relationships (73 ) 4 (5 ) (1 ) (4 ) 1 Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate commercial loans 1 — — — — — Total gain on cash flow hedging relationships $ 1 $ — $ — $ — $ — $ 1 The following table summarizes the effect of cash flow hedges on accumulated other comprehensive income. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Interest rate contracts (Loss) gain recognized in other comprehensive income $ (19 ) $ 22 $ 150 $ 12 The following table summarizes the effect of net investment hedges on accumulated other comprehensive income and the Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Foreign exchange contracts (a) (b) (Loss) gain recognized in other comprehensive income $ (6 ) $ (3 ) $ 6 $ (5 ) (a) There were no amounts excluded from effectiveness testing for the three months and six months ended June 30, 2020 , or 2019 . (b) Gains and losses reclassified from accumulated other comprehensive income 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, 2020 , or 2019 .

Income Taxes (Notes)

Income Taxes (Notes)	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Tax Disclosure	Income Taxes We recognized total income tax expense from continuing operations of $95 million and $3 million for the three months and six months ended June 30, 2020 , respectively, compared to an income tax benefit of $90 million and income tax expense of $21 million for the same periods in 2019 . The increase in income tax expense for the three months ended June 30, 2020, compared to the same period in 2019, was primarily driven by a nonrecurring tax benefit of approximately $200 million from the release of valuation allowance on foreign tax credit carryforwards during the second quarter of 2019, and a nondeductible goodwill impairment during the second quarter of 2020. The valuation allowance release resulted in a significant variation in the customary relationship between pretax income and income tax expense for the three months ended June 30, 2019. Additionally, the increase in income tax expense for the three months ended June 30, 2020, compared to the same period in 2019, was partially offset by the tax effects of a decrease in pretax earnings. The decrease in income tax expense for the six months ended June 30, 2020, compared to the same period in 2019, was primarily due to the tax effects of a decrease in pretax earnings, partially offset by a nonrecurring tax benefit from the release of valuation allowance on foreign tax credit carryforwards during the second quarter of 2019, and a nondeductible goodwill impairment during the second quarter of 2020. The nondeductible goodwill impairment resulted in a significant variation in the customary relationship between pretax income and income tax expense for the six months ended June 30, 2020. 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. 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 12 months.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2020
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 — We hold 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 — We carry our available-for-sale securities at fair value based on external pricing sources. We classify our securities as Level 1 when fair value is determined using quoted prices available for the same instruments trading in active markets. We classify our securities as Level 2 when fair value is determined using prices for similar instruments trading in active markets. We perform pricing validation procedures for our available-for-sale securities. • Interests retained in financial asset sales — We retain 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 (for example, forward interest rates) and internally developed inputs (for example, 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 equity options. To determine the fair value of these instruments, we utilize the quoted market prices for those 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 CVA, if warranted. The CVA calculation would utilize 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, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 608 $ — $ 5 $ 613 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 807 — — 807 U.S. States and political subdivisions — 908 5 913 Foreign government 15 147 — 162 Agency mortgage-backed residential — 19,884 — 19,884 Mortgage-backed residential — 3,425 — 3,425 Agency mortgage-backed commercial — 1,786 — 1,786 Mortgage-backed commercial — 38 — 38 Asset-backed — 356 — 356 Corporate debt — 1,854 — 1,854 Total available-for-sale securities 822 28,398 5 29,225 Mortgage loans held-for-sale (b) — — 91 91 Finance receivables and loans, net Consumer other (b) — — 8 8 Interests retained in financial asset sales — — 1 1 Derivative contracts in a receivable position Interest rate — — 12 12 Other 2 — — 2 Total derivative contracts in a receivable position 2 — 12 14 Total assets $ 1,432 $ 28,398 $ 122 $ 29,952 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Other $ 2 — — $ 2 Total derivative contracts in a payable position 2 — — 2 Total liabilities $ 2 $ — $ — $ 2 (a) Our direct investment in any one industry did not exceed 11% . (b) Carried at fair value due to fair value option elections. Recurring fair value measurements December 31, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 608 $ — $ 8 $ 616 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 2,047 1 — 2,048 U.S. States and political subdivisions — 639 2 641 Foreign government 15 171 — 186 Agency mortgage-backed residential — 21,404 — 21,404 Mortgage-backed residential — 2,850 — 2,850 Agency mortgage-backed commercial — 1,382 — 1,382 Mortgage-backed commercial — 42 — 42 Asset-backed — 368 — 368 Corporate debt — 1,363 — 1,363 Total available-for-sale securities 2,062 28,220 2 30,284 Mortgage loans held-for-sale (b) — — 30 30 Finance receivables and loans, net Consumer other (b) — — 11 11 Interests retained in financial asset sales — — 2 2 Derivative contracts in a receivable position Interest rate — 62 2 64 Total derivative contracts in a receivable position — 62 2 64 Total assets $ 2,670 $ 28,282 $ 55 $ 31,007 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Foreign currency $ — $ 5 $ — $ 5 Total derivative contracts in a payable position — 5 — 5 Total liabilities $ — $ 5 $ — $ 5 (a) Our investment in any one industry did not exceed 13% . (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, 2020 Net unrealized gains still held at June 30, 2020 ($ in millions) Fair value at April 1, 2020 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Investment securities Equity securities $ 4 $ 1 (a) $ — $ — $ — $ — $ — $ 5 $ 1 $ — Available-for-sale securities 3 — — 2 — — — 5 — — Mortgage loans held-for-sale (b) 68 8 (c) — 676 (661 ) — — 91 1 — Finance receivables and loans, net (b) 10 1 (d) — 3 — — (6 ) 8 — — Other assets Interests retained in financial asset sales 1 — — — — — — 1 — — Derivative assets 8 4 (c) — — — — — 12 4 — Total assets $ 94 $ 14 $ — $ 681 $ (661 ) $ — $ (6 ) $ 122 $ 6 $ — (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 . (d) Reported as interest and fees on finance receivables and loans and other income, net of losses 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 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 — — — — — — 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 Net realized/unrealized (losses) gains Fair value at June 30, 2020 Net unrealized (losses) gains still held at June 30, 2020 ($ in millions) Fair value at Jan. 1, 2020 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Investment securities Equity securities $ 8 $ (3 ) (a) $ — $ — $ — $ — $ — $ 5 $ (3 ) $ — Available-for-sale securities 2 — — 3 — — — 5 — — Mortgage loans held-for-sale (b) 30 13 (c) — 978 (930 ) — — 91 2 — Finance receivables and loans, net (b) 11 — — 9 — — (12 ) 8 — — Other assets Interests retained in financial asset sales 2 — — — — — (1 ) 1 — — Derivative assets 2 10 (c) — — — — — 12 10 — Total assets $ 55 $ 20 $ — $ 990 $ (930 ) $ — $ (13 ) $ 122 $ 9 $ — (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 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 . 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, 2020 , and December 31, 2019 , respectively. The amounts are generally 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 adjustments Total gain (loss) included in earnings June 30, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 313 $ 313 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 53 53 (17 ) n/m (a) Other — — 44 44 (10 ) n/m (a) Total commercial finance receivables and loans, net — — 97 97 (27 ) n/m (a) Other assets Nonmarketable equity investments — — 5 5 (4 ) n/m (a) Goodwill (c) — — 143 143 (50 ) n/m (a) Repossessed and foreclosed assets (d) — — 8 8 — n/m (a) Total assets $ — $ — $ 566 $ 566 $ (81 ) 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 2020 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) On April 30, 2020, we recognized a $50 million impairment of goodwill at Ally Invest. Refer to Note 11 for further discussion. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring fair value measurements Lower-of-cost or fair value reserve, valuation reserve, or cumulative adjustments Total gain (loss) included in earnings December 31, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 128 $ 128 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 64 64 (12 ) n/m (a) Other — — 45 45 (21 ) n/m (a) Total commercial finance receivables and loans, net — — 109 109 (33 ) n/m (a) Other assets Nonmarketable equity investments — 5 7 12 — n/m (a) Equity-method investments — — 4 4 (6 ) n/m (a) Repossessed and foreclosed assets (c) — — 12 12 (1 ) n/m (a) Total assets $ — $ 5 $ 260 $ 265 $ (40 ) 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. Fair Value Option for Financial Assets We elected the fair value option for an insignificant amount of conforming mortgage loans held-for-sale and certain acquired unsecured consumer finance receivables. We elected the fair value option for conforming mortgage loans held-for-sale to mitigate earnings volatility by better matching the accounting for the assets with the related derivatives. We elected the fair value option for certain acquired unsecured consumer finance receivables to mitigate the complexities of recording these loans at amortized cost. 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, 2020 , and December 31, 2019 . Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2020 Financial assets Held-to-maturity securities $ 1,390 $ — $ 1,476 $ — $ 1,476 Loans held-for-sale, net 313 — — 313 313 Finance receivables and loans, net 114,872 — — 120,845 120,845 FHLB/FRB stock (a) 1,000 — 1,000 — 1,000 Financial liabilities Deposit liabilities $ 60,340 $ — $ — $ 61,429 $ 61,429 Short-term borrowings 3,689 — — 3,692 3,692 Long-term debt 29,176 — 19,462 12,223 31,685 December 31, 2019 Financial assets Held-to-maturity securities $ 1,568 $ — $ 1,600 $ — $ 1,600 Loans held-for-sale, net 128 — — 128 128 Finance receivables and loans, net 126,957 — — 130,837 130,837 FHLB/FRB stock (a) 1,150 — 1,150 — 1,150 Financial liabilities Deposit liabilities $ 60,146 $ — $ — $ 60,678 $ 60,678 Short-term borrowings 5,531 — — 5,532 5,532 Long-term debt 34,027 — 22,789 14,138 36,927 (a) Included in other assets on our Condensed Consolidated Balance Sheet .

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	6 Months Ended
	Jun. 30, 2020
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, 2020 , these instruments are reported as gross assets and gross liabilities on the Condensed Consolidated Balance Sheet . For additional information on derivative instruments and hedging activities, refer to Note 18 . 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 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount June 30, 2020 Assets Derivative assets in net asset positions $ 2 $ — $ 2 $ (2 ) $ — $ — Derivative assets with no offsetting arrangements 12 — 12 — — 12 Total assets $ 14 $ — $ 14 $ (2 ) $ — $ 12 Liabilities Derivative liabilities in net asset positions $ 2 $ — $ 2 $ (2 ) $ — $ — Securities sold under agreements to repurchase (d) 79 — 79 — (79 ) — Total liabilities $ 81 $ — $ 81 $ (2 ) $ (79 ) $ — December 31, 2019 Assets Derivative assets in net asset positions $ 62 $ — $ 62 $ — $ (36 ) $ 26 Derivative assets with no offsetting arrangements 2 — 2 — — 2 Total assets $ 64 $ — $ 64 $ — $ (36 ) $ 28 Liabilities Derivative liabilities in net liability positions $ 5 $ — $ 5 $ — $ (4 ) $ 1 Total liabilities $ 5 $ — $ 5 $ — $ (4 ) $ 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 $29 million of noncash derivative collateral pledged to us that was excluded at December 31, 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 $29 million at December 31, 2019 . We have not sold or pledged any of the noncash collateral received under these agreements. (d) For additional information on securities sold under agreements to repurchase, refer to Note 13 .

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2020
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 — Consists of the management of held-for-investment and held-for sale consumer mortgage loan portfolios. Our held-for-investment loan portfolio includes bulk purchases of high-quality jumbo and LMI mortgage loans originated by third parties. Our direct-to-consumer mortgage offering, referred to as 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, with a focus on businesses owned by private equity sponsors. These loans are typically used for leveraged buyouts, mergers and acquisitions, debt refinancing, restructurings, and working capital. We also provide nonbank wholesale-funded managers with partial funding for their direct-lending activities, which is principally leveraged loans. Additionally, we 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 FTP and treasury 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. Financial results related to Ally Invest, our online brokerage operations, are currently included within Corporate and Other. Additionally, beginning in October 2019 with the acquisition of Health Credit Services, financial information related to Ally Lending, our point-of-sale financing business, is 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) 2020 Net financing revenue and other interest income $ 989 $ 12 $ 30 $ 77 $ (54 ) $ 1,054 Other revenue 40 438 19 6 52 555 Total net revenue 1,029 450 49 83 (2 ) 1,609 Provision for credit losses 256 — 3 25 3 287 Total noninterest expense 444 322 38 26 155 985 Income (loss) from continuing operations before income tax expense $ 329 $ 128 $ 8 $ 32 $ (160 ) $ 337 Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 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 credit 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 (a) Net financing revenue and other interest income after the provision for credit losses totaled $767 million and $980 million for the three months ended June 30, 2020 , and June 30, 2019 , respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2020 Net financing revenue and other interest income $ 2,029 $ 26 $ 68 $ 145 $ (68 ) $ 2,200 Other revenue 87 575 29 19 111 821 Total net revenue 2,116 601 97 164 43 3,021 Provision for credit losses 1,022 — 4 139 25 1,190 Total noninterest expense 938 578 73 61 255 1,905 Income (loss) from continuing operations before income tax expense $ 156 $ 23 $ 20 $ (36 ) $ (237 ) $ (74 ) Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 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 credit 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 (a) Net financing revenue and other interest income after the provision for credit losses totaled $1.0 billion and $1.8 billion for the six months ended June 30, 2020 , and June 30, 2019 , respectively.

Contingencies and Other Risks

Contingencies and Other Risks	6 Months Ended
	Jun. 30, 2020
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 Topic 450, Contingencies . Refer to Note 1 to the Consolidated Financial Statements in our 2019 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. Descriptions of certain of our legal matters follow. We do not believe, however, that an estimate of reasonably possible losses or a range of reasonably possible losses—whether in excess of any related accrual or where no accrual exists—can be made for any of these matters for some or all of the reasons identified in the preceding paragraphs. Purported and Certified Class Actions In March 2016, Ally filed an action against two buyers of a motor vehicle— Ally Financial Inc. v. Alberta Haskins and David Duncan , Case No. 16JE-AC01713-01, in the Circuit Court of Jefferson County, Missouri—for the purpose of collecting the deficiency that remained due under the retail installment sales contract after the buyers had defaulted and the vehicle had been repossessed and disposed of. In March 2017, the buyers filed a second amended answer and counterclaim on behalf of nationwide and Missouri classes, arguing that Ally’s pre- and post-disposition notices had violated Article 9 of the Uniform Commercial Code as adopted in each State and other applicable jurisdiction. The request for relief included an indeterminate amount of actual, statutory, and punitive damages as well as fees, costs, interest, and other remedies. In May 2018, the circuit court certified the nationwide and Missouri classes and denied Ally’s motion for partial summary judgment. In September 2018, the case was reassigned to a different circuit-court judge, and in February 2019, Ally filed a motion to decertify the nationwide and Missouri classes. In November 2019, the circuit court denied Ally’s motion to decertify. In December 2019, Ally filed a petition with the Missouri Court of Appeals and then with the Missouri Supreme Court for a writ prohibiting the circuit court from taking further action other than vacating the order denying decertification, but each of those petitions was denied. In January 2020, the case was reassigned to a different circuit-court judge. In June 2020, the buyers on behalf of the certified nationwide and Missouri classes filed a motion for partial summary judgment on liability and damages, including statutory damages, the waiver of amounts due, and prejudgment interest. These damages, if awarded by the court, could be significant. We intend to vigorously defend against the claims made by the buyers, including their measure of alleged damages, and the circuit court’s certification of nationwide and Missouri classes.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Declaration of Quarterly Dividend On July 14, 2020 , our Board declared a quarterly cash dividend of $0.19 per share on all common stock. The dividend is payable on August 14, 2020 , to stockholders of record at the close of business on July 31, 2020 .

Description of Business, Basi_2

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Basis of Accounting	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.
Investments	Our investment portfolio includes various debt and equity securities. Our debt securities include government securities, corporate bonds, ABS, and MBS. Debt securities are classified based on management’s intent to sell or hold the security. We classify debt securities as held-to-maturity only when we have both the intent and ability to hold the securities to maturity. We classify debt securities as trading when the securities are acquired for the purpose of selling or holding them for a short period of time. Debt securities not classified as either held-to-maturity or trading are classified as available-for-sale. Our portfolio includes debt securities classified as available-for-sale and held-to-maturity. Our available-for-sale securities are carried at fair value with unrealized gains and losses included in accumulated other comprehensive income, while our held-to-maturity securities are carried at amortized cost. We establish an allowance for credit losses for lifetime expected credit losses on our held-to-maturity securities. The estimate of expected credit losses considers historical credit loss information that is adjusted for current conditions and reasonable and supportable forecasts. Accrued interest receivable on held-to-maturity securities is excluded from the estimate of credit losses. Our held-to-maturity securities portfolio is mostly comprised of residential mortgage-backed debt securities that are issued by U.S. government entities and agencies. These securities are either explicitly or implicitly guaranteed by the U.S. government, are highly rated by major ratings agencies, and have a long history of zero credit losses. We regularly assess our available-for-sale securities for impairment. When the cost of an available-for-sale security exceeds its fair value, the security is impaired. If we determine that we intend to sell, or it is more likely than not we will be required to sell the security before recovery of the amortized cost basis, any allowance for credit losses, if previously recorded, is written off and the security’s amortized cost basis is written down to fair value at the reporting date, with any incremental impairment recorded through earnings. Alternatively, if we do not intend to sell, or it is not more likely than not that we will be required to sell the security before anticipated recovery of the amortized cost basis, we evaluate, among other factors, the magnitude of the decline in fair value, the financial health of and business outlook for the issuer, and the performance of the underlying assets for interests in securitized assets to determine if a credit loss has occurred. The present value of expected future cash flows are compared to the security’s amortized cost basis to measure the credit loss component of the impairment after determining a credit loss has occurred. If the present value of expected cash flows is less than the amortized cost basis, we record an allowance for credit losses for that difference. The amount of credit loss is limited to the difference between the security’s amortized cost basis and its fair value. Any remaining impairment is considered a noncredit loss and is recorded in other comprehensive income. Changes in the allowance for credit losses are recorded as provision for, or reversal of, provision for credit losses. Accrued interest receivable on available-for-sale securities is excluded from the estimate of credit losses. Premiums and discounts on debt securities are generally amortized over the stated maturity of the security as an adjustment to investment yield. Premiums on debt securities that have non-contingent call features that are callable at fixed prices on preset dates are amortized to the earliest call date as an adjustment to investment yield. A debt security is placed on nonaccrual status at the time any principal or interest payments become 90 days past due. The receivable for interest income that is accrued but not collected is reversed against interest income when the debt security is placed on nonaccrual status. Our investments in equity securities include securities that are recognized at fair value with changes in the fair value recorded in earnings, and equity securities that are recognized using other measurement principles. Equity securities that have a readily determinable fair value are recorded at fair value with changes in fair value recorded in earnings and reported in other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income. These investments, which are primarily attributable to the investment portfolio of our Insurance operations, are included in equity securities on our Condensed Consolidated Balance Sheet. We also hold certain equity investments that do not have a readily determinable fair value and are not eligible to be recognized using other measurement principles, that are held at fair value. Refer to Note 20 for further information on these equity securities that have a readily determinable market value. Our equity securities recognized using other measurement principles include investments in FHLB and FRB stock held to meet regulatory requirements, equity investments related to LIHTCs and the CRA, which do not have a readily determinable fair value, and other equity investments that do not have a readily determinable fair value. Our LIHTC investments are accounted for using the proportional amortization method of accounting for qualified affordable housing investments. Our obligations related to unfunded commitments for our LIHTC investments are included in other liabilities. The majority of our other CRA investments are accounted for using the equity method of accounting. Our investments in LIHTCs and other CRA investments are included in investments in qualified affordable housing projects and equity-method investments, respectively, in other assets on our Condensed Consolidated Balance Sheet. Our investments in FHLB and FRB stock are carried at cost, less impairment. Our remaining investments in equity securities are recorded at cost, less impairment and adjusted for observable price changes under the measurement alternative provided under GAAP. These investments, along with our investments in FHLB and FRB stock, are included in nonmarketable equity investments in other assets on our Condensed Consolidated Balance Sheet. Investments recorded under the measurement alternative are also reviewed at each reporting period to determine if any adjustments are required for observable price changes in identical or similar securities of the same issuer. As conditions warrant, we review these investments for impairment and adjust the carrying value of the investment if it is deemed to be impaired. Realized gains and losses on the sale of securities are determined using the specific identification method and are reported in other gain on investments, net in our Condensed Consolidated Statement of Comprehensive Income.
Finance Receivables and Loans	We initially classify finance receivables and loans as either loans held-for-sale or loans held-for-investment based on management’s assessment of our intent and ability to hold the loans for the foreseeable future or until maturity. Management’s view of the foreseeable future is based on the longest reasonably reliable net income, liquidity, and capital forecast period. Management’s intent and ability with respect to certain loans may change from time to time depending on a number of factors, for example economic, liquidity, and capital conditions. In order to reclassify loans to held-for-sale, management must have the intent to sell the loans and reasonably identify the specific loans to be sold. Loans classified as held-for-sale are presented as loans held-for-sale, net on our Condensed Consolidated Balance Sheet and are carried at the lower of their net carrying value or fair value, unless the fair value option was elected, in which case those loans are carried at fair value. Loan origination fees and costs are included in the initial carrying value of loans originated as held-for-sale for which we have not elected the fair value option. Loan origination fees and costs are recognized in earnings when earned or incurred, respectively, for loans classified as held-for-sale for which we have elected the fair value option. We have elected the fair value option for conforming mortgage direct-to-consumer originations for which we have a commitment to sell. The interest rate lock commitment that we enter into for a mortgage loan originated as held-for-sale and certain forward commitments are considered derivatives, which are carried at fair value on our Condensed Consolidated Balance Sheet. We have elected the fair value option to measure our nonderivative forward commitments. Changes in the fair value of our interest rate lock commitments, derivative forward commitments, and nonderivative forward commitments related to mortgage loans originated as held-for-sale, as well as changes in the carrying value of loans classified as held-for-sale, are reported through gain on mortgage and automotive loans, net in our Condensed Consolidated Statement of Comprehensive Income. Interest income on our loans classified as held-for-sale is recognized based upon the contractual rate of interest on the loan and the unpaid principal balance. We report accrued interest receivable on our loans classified as held-for-sale in other assets on our Condensed Consolidated Balance Sheet. We have also elected the fair value option for certain loans acquired within our consumer other portfolio segment. Changes in fair value related to these loans are reported through other income, net of losses in our Condensed Consolidated Statement of Comprehensive Income. Loans classified as held-for-investment are presented as finance receivables and loans, net on our Condensed Consolidated Balance Sheet. Finance receivables and loans are reported at their amortized cost basis, which includes the principal amount outstanding, net of unamortized deferred fees and costs on originated loans, unamortized premiums and discounts on purchased loans, unamortized basis adjustments arising from the designation of finance receivables and loans as the hedged item in qualifying fair value hedge relationships, and cumulative principal charge-offs. We refer to the amortized cost basis less the allowance for loan loss as the net carrying value in finance receivables and loans. Unearned rate support received from an automotive manufacturer on certain automotive loans, deferred origination fees and costs, and premiums and discounts on purchased loans, are amortized over the contractual life of the related finance receivable or loan using the effective interest method. We make various incentive payments for consumer automotive loan originations to automotive dealers and account for these payments as direct loan origination costs. Additionally, we make incentive payments to certain commercial automobile wholesale borrowers and account for these payments as a reduction to interest income in the period they are earned. Interest income on our finance receivables and loans is recognized based on the contractual rate of interest plus the amortization of deferred amounts using the effective interest method. We report accrued interest receivable on our finance receivables and loans in other assets on our Condensed Consolidated Balance Sheet. Loan commitment fees are generally deferred and amortized over the commitment period. For information on finance receivables and loans, refer to Note 8 . We have elected to exclude accrued interest receivable from the measurement of our allowance for credit losses for each class of financing receivables. We have also elected to write-off accrued interest receivable by reversing interest income when loans are placed on nonaccrual status for each class of financing receivable. Our portfolio segments are based on the level at which we develop and document our methodology for determining the allowance for loan losses. Additionally, the classes of finance receivables are based on several factors including the method for monitoring and assessing credit risk, the method of measuring carrying value, and the risk characteristics of the finance receivable. Based on an evaluation of our process for developing the allowance for loan losses including the nature and extent of exposure to credit risk arising from finance receivables, we have determined our portfolio segments to be consumer automotive, consumer mortgage, consumer other, and commercial. • Consumer automotive — Consists of retail automotive financing for new and used vehicles. • Consumer mortgage — Consists of the following classes of finance receivables. • Mortgage Finance — Consists of consumer first-lien mortgages from our ongoing mortgage operations including bulk acquisitions, direct-to-consumer originations, and refinancing of high-quality jumbo mortgages and LMI mortgages. • Mortgage — Legacy — Consists of consumer mortgage assets originated prior to January 1, 2009, including first-lien mortgages, subordinate-lien mortgages, and home equity mortgages. • Consumer other — Consists of unsecured consumer lending from point-of-sale financing. • Commercial — Consists of the following classes of finance receivables. • Commercial and Industrial • Automotive — Consists of financing operations to fund dealer purchases of new and used vehicles through wholesale floorplan financing. Additional commercial offerings include automotive dealer term loans, revolving lines, and dealer fleet financing. • Other — Consists primarily of senior secured leveraged cash flow and asset-based loans related to our Corporate-Finance business. • Commercial Real Estate — Consists of term loans primarily secured by dealership land and buildings, and other commercial lending secured by real estate. Nonaccrual Loans Generally, we recognize loans of all classes as past due when they are 30 days delinquent on making a contractually required payment, and loans are placed on nonaccrual status when principal or interest has been delinquent for at least 90 days, or when full collection is not expected. Interest income recognition is suspended when finance receivables and loans are placed on nonaccrual status. Additionally, amortization of premiums and discounts and deferred fees and costs ceases when finance receivables and loans are placed on nonaccrual. Exceptions include commercial real estate loans that are placed on nonaccrual status when delinquent for 60 days or when full collection is not probable, if sooner. Additionally, our policy is to generally place all loans that have been modified in a TDR on nonaccrual status until the loan has been brought fully current, the collection of contractual principal and interest is reasonably assured, and six consecutive months of repayment performance is achieved. In certain cases, if a borrower has been current up to the time of the modification and repayment of the debt subsequent to the modification is reasonably assured, we may choose to continue to accrue interest on the loan. Nonperforming loans on nonaccrual status are reported in Note 8 . The receivable for interest income that is accrued, but not collected, at the date finance receivables and loans are placed on nonaccrual status is reversed against interest income and subsequently recognized only to the extent it is received in cash or until it qualifies for return to accrual status. However, where there is doubt regarding the ultimate collectability of loan principal, all cash received is applied to reduce the carrying value of such loans. Generally, finance receivables and loans are restored to accrual status only when contractually current and the collection of future payments is reasonably assured. Troubled Debt Restructurings When the terms of finance receivables or loans are modified, consideration must be given as to whether or not the modification results in a TDR. A modification is considered to be a TDR when both the borrower is experiencing financial difficulty and we grant a concession to the borrower. These considerations require significant judgment and vary by portfolio segment. In all cases, the cumulative impacts of all modifications are considered at the time of the most recent modification. For consumer loans of all classes, various qualitative factors are utilized for assessing the financial difficulty of the borrower. These include, but are not limited to, the borrower’s default status on any of its debts, bankruptcy, and recent changes in financial circumstances (for instance, loss of job). A concession has been granted when as a result of the modification we do not expect to collect all amounts due under the original loan terms, including interest accrued at the original contract rate. Types of modifications that may be considered concessions include, but are not limited to, extensions of terms at a rate that does not constitute a market rate, a reduction, deferral or forgiveness of principal or interest owed and loans that have been discharged in a Chapter 7 Bankruptcy and have not been reaffirmed by the borrower. In addition to the modifications noted above, in our consumer automotive portfolio segment of loans we also provide extensions or deferrals of payments to borrowers whom we deem to be experiencing only temporary financial difficulty. In these cases, there are limits within our operational policies to minimize the number of times a loan can be extended, as well as limits to the length of each extension, including a cumulative cap over the life of the loan. If these limits are breached, the modification is considered a TDR as noted in the following paragraph. Before offering an extension or deferral, we evaluate the capacity of the customer to make the scheduled payments after the deferral period. During the deferral period, we continue to accrue interest on the loan as part of the deferral agreement. We grant these extensions or deferrals when we expect to collect all amounts due including interest accrued at the original contract rate. However, in response to the COVID-19 pandemic, we offered broad-based deferral programs to all of our customers who requested assistance with their loans. A restructuring that results in only a delay in payment that is deemed to be insignificant is not a concession and the modification is not considered to be a TDR. In order to assess whether a restructuring that results in a delay in payment is insignificant, we consider the amount of the restructured payments subject to delay in conjunction with the unpaid principal balance or the collateral value of the loan, whether or not the delay is significant with respect to the frequency of payments under the original contract, or the loan’s original expected duration. In the cases where payment extensions on our automotive loan portfolio cumulatively extend beyond 90 days and are more than 10% of the original contractual term or where the cumulative payment extension is beyond 180 days, we deem the delay in payment to be more than insignificant, and as such, classify these types of modifications as TDRs. Otherwise, we believe that the modifications do not represent a concessionary modification and accordingly, they are not classified as TDRs. Additionally, based on guidance issued by federal and state regulatory agencies, loan modifications made in response to the COVID-19 pandemic are not considered TDRs if accounts were considered current at the date the modification program was implemented. Refer to Note 8 for additional information. For commercial loans of all classes, similar qualitative factors are considered when assessing the financial difficulty of the borrower. In addition to the factors noted above, consideration is also given to the borrower’s forecasted ability to service the debt in accordance with the contractual terms, possible regulatory actions, and other potential business disruptions (for example, the loss of a significant customer or other revenue stream). Consideration of a concession is also similar for commercial loans. In addition to the factors noted above, consideration is also given to whether additional guarantees or collateral have been provided. For all loans, TDR classification typically results from our loss mitigation activities. For loans held-for-investment that are not carried at fair value and are TDRs, impairment is typically measured based on the difference between the amortized cost basis of the loan and the present value of the expected future cash flows of the loan. The present value is calculated using the loan’s original interest rate, as opposed to the interest rate specified within the restructuring. The loan may also be measured for impairment based on the fair value of the underlying collateral less costs to sell for loans that are collateral dependent. We recognize impairment by either establishing a valuation allowance or recording a charge-off. The financial impacts of modifications that meet the definition of a TDR are reported in the period in which they are identified as TDRs. Additionally, if a loan that is classified as a TDR redefaults within 12 months of the modification, we are required to disclose the instances of redefault. For the purpose of this disclosure, we have determined that a loan is considered to have redefaulted when the loan meets the requirements for evaluation under our charge-off policy except for commercial loans where redefault is defined as 90 days past due. Nonaccrual loans may return to accrual status as discussed in the preceding nonaccrual loan section at which time, the normal accrual of interest income resumes. Net Charge-offs We disclose the measurement of net charge-offs as the amount of gross charge-offs recognized less recoveries received. Gross charge-offs reflect the amount of the amortized cost basis directly written-off. Generally, we recognize recoveries when they are received and record them as an increase to the allowance for loan losses. As a general rule, consumer automotive loans are written down to estimated collateral value, less costs to sell, if repossession is assured and in process once a loan becomes 120 days past due. In our consumer mortgage portfolio segment, first-lien mortgages and a subset of our home equity portfolio that are secured by real estate in a first-lien position are written down to the estimated fair value of the collateral, less costs to sell, once a mortgage loan becomes 180 days past due. Consumer mortgage loans that represent second-lien positions are charged off at 180 days past due. Loans in our consumer other segment are charged off at 120 days past due. Within 60 days of receipt of notification of filing from the bankruptcy court, or within the time frames noted above, consumer automotive and first-lien consumer mortgage loans in bankruptcy are written down to their expected future cash flows, which is generally fair value of the collateral, less costs to sell, and second-lien consumer mortgage loans and consumer other loans are fully charged-off, unless it can be clearly demonstrated that repayment is likely to occur. Regardless of other timelines noted within this policy, loans are considered collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to only be through sale or operation of the collateral. Collateral dependent loans are charged-off to the estimated fair value of the underlying collateral, less costs to sell when foreclosure or repossession proceedings begin. Commercial loans are individually evaluated and are written down to the estimated fair value of the collateral less costs to sell when collectability of the recorded balance is in doubt. Generally, all commercial loans are charged-off when it becomes unlikely that the borrower is willing or able to repay the remaining balance of the loan and any underlying collateral is not sufficient to recover the outstanding principal. Collateral dependent loans are charged-off to the fair market value of collateral less costs to sell when appropriate. Noncollateral dependent loans are fully written-off.
Allowance for Loan Losses	The allowance for loan losses (the allowance) is deducted from, or added to, the loan’s amortized cost basis to present the net amount expected to be collected from our lending portfolios. We estimate the allowance using relevant available information, which includes both internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Additions to the allowance are charged to current period earnings through the provision for loan losses; amounts determined to be uncollectible are charged directly against the allowance, net of amounts recovered on previously charged-off accounts. Expected recoveries do not exceed the total of amounts previously charged-off and amounts expected to be charged-off. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions or renewals, unless the extension or renewal option is included in the original or modified contract at the reporting date and we are not able to unconditionally cancel the option. Expected loan modifications are also not included in the contractual term, unless we have a reasonable expectation at period end that a TDR will be executed with a borrower. For the purpose of calculating portfolio-level reserves, we have grouped our loans into four portfolio segments: consumer automotive, consumer mortgage, consumer other, and commercial. The allowance for loan losses is measured on a collective basis using statistical models when loans have similar risk characteristics. These statistical models are designed to correlate certain macroeconomic variables to expected future credit losses. The macroeconomic data used in the models are based on forecasted rates for the next 12-months. These forecasted variables are derived from both internal and external sources. Beyond this forecast period, we revert to a historical average rate. This reversion to the mean is performed on a straight-line basis over 24 months. The historical average is calculated using historical data beginning in January 2008 through the current period. Loans that do not share similar risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. The allowance calculation is also supplemented with qualitative reserves that take into consideration current portfolio and asset-level factors, such as the impacts of changes in underwriting standards, collections and account management effectiveness, geographic concentrations, and economic events that have occurred but are not yet reflected in the quantitative model component. Qualitative adjustments are documented, reviewed, and approved through our established risk governance processes and follow regulatory guidance. Management also considers the need for a reserve on unfunded nonderivative loan commitments across our portfolio segments, including lines of credit and standby letters of credit. We estimate expected credit losses over the contractual period in which we are exposed to credit risk, unless we have the option to unconditionally cancel the obligation. Expected credit losses include consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over the estimated life. The reserve for unfunded loan commitments is recorded within other liabilities on our Condensed Consolidated Balance Sheet. Refer to Note 28 within our 2019 Annual Report on Form 10-K for information on our unfunded loan commitments. Consumer Automotive The allowance for loan losses within the consumer automotive portfolio segment is calculated using proprietary statistical models and other risk indicators applied to pools of loans with similar risk characteristics, including credit bureau score and LTV ratios. The model generates projections of default rates, prepayment rates, loss severity rates, and recovery rates using macroeconomic and historical loan data. These projections are used to develop transition scenarios to predict the portfolio’s migration from the current past-due status to various future states over the life of the loan. While the macroeconomic data that is used to calculate expected credit losses includes interest rate indices and national and state-level home price indices, national and state-level unemployment rates are the most impactful macroeconomic factors in calculating expected lifetime credit losses. The loss severity within the consumer automotive portfolio segment is impacted by the market values of vehicles that are repossessed. Vehicle market values are affected by numerous factors including vehicle supply, the condition of the vehicle upon repossession, the overall price and volatility of gasoline or diesel fuel, consumer preference related to specific vehicle segments, and other factors. The model output is then aggregated to calculate expected lifetime credit losses. Consumer Mortgage The allowance for loan losses within the consumer mortgage portfolio segment is calculated by using statistical models based on pools of loans with similar risk characteristics, including credit score, LTV, loan age, documentation type, product type, and loan purpose. Expected losses are statistically derived based on a suite of behavioral based transition models. This transition framework predicts various stages of delinquency, default, and voluntary prepayment over the course of the life of the loan. The transition probability is a function of certain loan and borrower characteristics, including factors such as loan balance and term, the borrower’s credit score, and loan-to-value ratios, and economic variables, as well as consideration of historical factors such as loss frequency and severity. When a default event is predicted, a severity model is applied to estimate future loan losses. Loss severity within the consumer mortgage portfolio segment is impacted by the market values of foreclosed properties, which is affected by numerous factors, including geographic considerations and the condition of the foreclosed property. Macroeconomic data that is used to calculate expected credit losses includes certain interest rates and home price indices. The model output is then aggregated to calculate expected lifetime credit losses. Consumer Other The allowance for loan losses within the consumer other portfolio segment is calculated by using a vintage analysis that analyzes historical performance for groups of loans with similar risk characteristics, including vintage level historical balance paydown rates and delinquency and roll rate behaviors by risk tier and product type, to arrive at an estimate of expected lifetime credit losses. The risk tier segmentation is based upon borrower risk characteristics, including credit score and past performance history, as well as certain loan specific characteristics, such as loan type and origination year. Commercial Loans The allowance for loan losses within the commercial loan portfolio segment is calculated using risk rating models that use historical loss experience, concentrations, macroeconomic factors, and performance trends. The determination of the allowance is influenced by numerous assumptions and factors that may materially affect estimates of loss, including changes to the PD, LGD, and EAD. PD factors are determined based on our historical performance data, which considers on-going reviews of the financial performance of the specific borrower, including cash flow, debt-service coverage ratio, and an assessment of the borrower’s industry and future prospects. The determination of PD also incorporates historical loss performance and, when necessary, macroeconomic information obtained from external sources. LGD factors consider the type of collateral, relative loan-to-value ratios, and historical loss information. In addition, LGD factors may be influenced by situations in which automotive manufacturers repurchase vehicles used as collateral to secure the loans in default situations . EAD factors are derived from outstanding balance levels, including estimated prepayment assumptions based on historical performance. Refer to Note 8 for information on the allowance for loan losses.
Goodwill and Other Intangibles	On January 1, 2020, we adopted ASU 2017-04, Intangibles—Goodwill and Other: Simplifying the Test for Goodwill Impairment , on a prospective basis, resulting in an update to our accounting policy. Goodwill and intangible assets, net of accumulated amortization, are reported in other assets in our Condensed Consolidated Balance Sheet . Our intangible assets primarily consist of acquired customer relationships and developed technology, and are amortized using a straight-line methodology over their estimated useful lives. We review intangible assets for impairment at least annually, or whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. If it is determined the carrying amount of the asset is not recoverable, an impairment charge is recorded. Goodwill represents the excess of the cost of an acquisition over the fair value of net assets acquired, including identifiable intangibles. We allocate goodwill to applicable reporting units based on the relative fair value of the other net assets allocated to those reporting units at the time of the acquisition. In the event we restructure our business, we may reallocate goodwill. We test goodwill for impairment annually, or more frequently if events and changes in circumstances indicate that it is more likely than not that impairment exists. Our annual goodwill impairment test is performed as of August 31 of each year. In certain situations, we may perform a qualitative assessment to test goodwill for impairment. We may also decide to bypass the qualitative assessment and perform a quantitative assessment. If we perform the qualitative assessment to test goodwill for impairment and conclude that it is more likely than not that the reporting unit’s fair value is greater than its carrying value, then the quantitative assessment is not required. However, if we perform the qualitative assessment and determine that it is more likely than not that a reporting unit’s fair value is less than its carrying value, then we must perform the quantitative assessment. The quantitative assessment requires us to compare the fair value of each of the reporting units to their respective carrying value. The fair value of the reporting units in our quantitative assessment is determined based on various analyses including discounted cash flow projections using assumptions a market participant would use. If the fair value of a reporting unit exceeds its carrying amount, goodwill is not considered impaired. If the carrying amount of a reporting unit exceeds its fair value, a goodwill impairment loss is recorded for the excess of the carrying value of the reporting unit over its fair value.
Income Taxes	In calculating the provision for interim income taxes, in accordance with ASC Topic 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 2019 Annual Report on Form 10-K, which describes our annual significant income tax accounting policy and related methodology.
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: Measurement of Credit Losses on Financial Instruments . 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 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 securities should be measured in a manner similar to current GAAP. On January 1, 2020, we adopted ASU 2016-13 and all subsequent ASUs that modified ASU 2016-13 (collectively, the amendments to the credit loss standard), which have been codified under ASC 326, Financial Instruments - Credit Losses . We adopted this guidance using the modified retrospective approach, as required, and have not adjusted prior period comparative information and will continue to disclose prior period financial information in accordance with the previous accounting guidance. While the standard modifies the measurement of the allowance for credit losses, it does not alter the credit risk of our finance receivables and loan portfolio. The adoption of the amendments resulted in a reduction to our opening retained earnings of approximately $1.0 billion , net of income taxes, resulting from a pretax increase to our allowance for credit losses of approximately $1.3 billion , primarily driven by our consumer automotive loan portfolio. The increase is primarily related to the difference between loss emergence periods previously utilized, as compared to estimating lifetime credit losses as required by the CECL standard. We did not experience a material impact to the allowance for loan losses from any of our other lending portfolios. Additionally, the adoption of CECL did not result in a material impact to our held-to-maturity securities portfolio, which is primarily composed of agency-backed mortgage securities, or our available-for-sale securities portfolio. We have elected to phase the estimated impact of CECL into regulatory capital in accordance with the interim final rule of the FRB and other U.S. banking agencies that became effective on March 31, 2020. As a result, we will delay recognizing the estimated impact of CECL on regulatory capital until after a two-year deferral period, which for us extends through December 31, 2021. Beginning on January 1, 2022, we will be required to phase in 25% of the previously deferred estimated capital impact of CECL, with an additional 25% to be phased in at the beginning of each subsequent year until fully phased in by the first quarter of 2025. Under the interim final rule, the estimated impact of CECL on regulatory capital that we will defer and later phase in is calculated as the entire day-one impact at adoption plus 25% of the subsequent change in allowance during the two-year deferral period. Refer to Note 17 for further details about the impact of CECL on regulatory capital. Our quantitative allowance for loan loss estimates under CECL is impacted by certain forecasted economic factors. In order to estimate the quantitative portion of our allowance for loan losses under CECL, our modeling processes rely on a single forecast scenario for each macroeconomic factor incorporated. To derive macroeconomic assumptions in this single scenario, we have elected to forecast these macroeconomic factors over a 12-month period, which we have determined to be reasonable and supportable. After the 12-month reasonable and supportable forecast period, we have elected to revert on a straight-line basis over a 24-month period to a historical mean for each macroeconomic factor. The mean is calculated from historical data spanning from January 2008 through the most current period, and as a result, includes data points from the last recessionary period. In addition to our quantitative allowance for loan losses, we also incorporate qualitative adjustments that may relate to idiosyncratic risks, changes in current economic conditions that may not be reflected in quantitatively derived results, or other relevant factors to further inform our estimate of the allowance for credit losses. Additionally, due to the expansion of the time horizon over which we are required to estimate future credit losses, we may experience increased volatility in our future provisions for credit losses. Factors that could contribute to such volatility include, but are not limited to, changes in the composition and credit quality of our financing receivables and loan portfolio and investment securities portfolios, economic conditions and forecasts, the allowance for credit loss models that are used, the data that is included in the models, the associated qualitative allowance framework, and our estimation techniques.
Accounting Standards Update 2020-04
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements, Policy	In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform : Facilitation of the Effects of Reference Rate Reform on Financial Reporting . The amendments in this update provide temporary, optional guidance to ease the potential burden in accounting for reference rate reform. The amendments provide optional expedients and exceptions for applying GAAP to transactions affected by reference rate reform if certain criteria are met. The amendments primarily include relief related to contract modifications and hedging relationships, as well as providing a one-time election for the sale or transfer of debt securities classified as held-to-maturity. The relief provided by this ASU does not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. However, hedging relationships that apply certain optional expedients prior to December 31, 2022, will be retained through the end of the hedging relationship, including for periods after December 31, 2022. We adopted the amendments in ASU 2020-04 as of the March 12, 2020 issuance date, on a prospective basis. The adoption did not have an immediate direct impact to our financial statements. As contracts are modified through December 2022, we will assess the impact based on this guidance. We do not expect there will be a material impact to our financial statements.

Fair Value (Policies)

Fair Value (Policies)	6 Months Ended
	Jun. 30, 2020
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, 2020
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 Topic 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 2019 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 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) (c) $ — $ 142 $ — $ — $ — $ 142 Remarketing fee income 15 — — — — 15 Brokerage commissions and other revenue — — — — 14 14 Brokered/agent commissions — 4 — — — 4 Deposit account and other banking fees — — — — 1 1 Other 3 — — — — 3 Total revenue from contracts with customers 18 146 — — 15 179 All other revenue 22 292 19 6 37 376 Total other revenue (d) $ 40 $ 438 $ 19 $ 6 $ 52 $ 555 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 Brokered/agent commissions — 4 — — — 4 Deposit account and other banking fees — — — — 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 (a) We had opening balances of $2.9 billion and $2.7 billion in unearned revenue associated with outstanding contracts at April 1, 2020, and April 1, 2019, respectively, and $211 million and $202 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, 2020 , and June 30, 2019 . (b) At June 30, 2020 , we had unearned revenue of $2.9 billion associated with outstanding contracts, and with respect to this balance we expect to recognize revenue of $406 million during the remainder of 2020 , $747 million in 2021 , $649 million in 2022 , $520 million in 2023 , and $596 million thereafter. At June 30, 2019 , we had unearned revenue of $2.8 billion associated with outstanding contracts. (c) We had deferred insurance assets of $1.7 billion and $1.8 billion at April 1, 2020, and June 30, 2020 , respectively, and recognized $121 million of expense during the three months ended June 30, 2020 . We had deferred insurance assets of $1.6 billion at both April 1, 2019, and June 30, 2019 , and recognized $114 million of expense during the three months ended June 30, 2019 . (d) Represents a component of total net revenue. Refer to Note 22 for further information on our reportable operating segments. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated 2020 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 285 $ — $ — $ — $ 285 Remarketing fee income 32 — — — — 32 Brokerage commissions and other revenue — — — — 27 27 Brokered/agent commissions — 8 — — — 8 Deposit account and other banking fees — — — — 5 5 Other 8 — — — — 8 Total revenue from contracts with customers 40 293 — — 32 365 All other revenue 47 282 29 19 79 456 Total other revenue (c) $ 87 $ 575 $ 29 $ 19 $ 111 $ 821 2019 Revenue from contracts with customers Noninsurance contracts (a) (b) $ — $ 265 $ — $ — $ — $ 265 Remarketing fee income 37 — — — — 37 Brokerage commissions and other revenue — — — — 34 34 Brokered/agent commissions — 7 — — — 7 Deposit account and other banking fees — — — — 9 9 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 (a) We had opening balances of $2.9 billion and $2.6 billion in unearned revenue associated with outstanding contracts at January 1, 2020, and January 1, 2019, respectively, and $425 million and $401 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, 2020 , and June 30, 2019 . (b) We had deferred insurance assets of $1.7 billion and $1.8 billion January 1, 2020, and June 30, 2020 , respectively, and recognized $246 million of expense during the six months ended June 30, 2020 . 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 . (c) Represents a component of total net revenue. Refer to Note 22 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, 2020
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) 2020 2019 2020 2019 Income from equity-method investments $ 53 $ 8 $ 52 $ 12 Late charges and other administrative fees 16 28 37 57 Remarketing fees 15 19 32 37 Servicing fees 2 4 5 10 Other, net 4 34 44 64 Total other income, net of losses $ 90 $ 93 $ 170 $ 180

Reserves for Insurance Losses_2

Reserves for Insurance Losses and Loss Adjustment Expenses (Tables)	6 Months Ended
	Jun. 30, 2020
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net [Abstract]
Short-duration insurance and deposit contracts	The following table shows a rollforward of our reserves for insurance losses and loss adjustment expenses. ($ in millions) 2020 2019 Total gross reserves for insurance losses and loss adjustment expenses at January 1, $ 122 $ 134 Less: Reinsurance recoverable 88 96 Net reserves for insurance losses and loss adjustment expenses at January 1, 34 38 Net insurance losses and loss adjustment expenses incurred related to: Current year 215 186 Prior years (a) 1 — Total net insurance losses and loss adjustment expenses incurred 216 186 Net insurance losses and loss adjustment expenses paid or payable related to: Current year (178 ) (134 ) Prior years (26 ) (27 ) Total net insurance losses and loss adjustment expenses paid or payable (204 ) (161 ) Net reserves for insurance losses and loss adjustment expenses at June 30, 46 63 Plus: Reinsurance recoverable 86 90 Total gross reserves for insurance losses and loss adjustment expenses at June 30, $ 132 $ 153 (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, 2020
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) 2020 2019 2020 2019 Insurance commissions $ 127 $ 117 $ 253 $ 231 Technology and communications 80 73 159 150 Lease and loan administration 46 43 84 82 Advertising and marketing 32 35 76 83 Property and equipment depreciation 34 25 68 47 Professional services 28 30 59 59 Regulatory and licensing fees 29 28 58 56 Vehicle remarketing and repossession 11 25 34 52 Occupancy 13 16 29 29 Non-income taxes 7 11 14 20 Amortization of intangible assets 5 3 10 6 Other 47 52 101 96 Total other operating expenses $ 459 $ 458 $ 945 $ 911

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2020
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 securities were as follows. June 30, 2020 December 31, 2019 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 $ 784 $ 23 $ — $ 807 $ 2,059 $ 6 $ (17 ) $ 2,048 U.S. States and political subdivisions 876 38 (1 ) 913 623 19 (1 ) 641 Foreign government 153 9 — 162 184 3 (1 ) 186 Agency mortgage-backed residential 19,136 752 (4 ) 19,884 21,183 257 (36 ) 21,404 Mortgage-backed residential 3,387 42 (4 ) 3,425 2,841 20 (11 ) 2,850 Agency mortgage-backed commercial 1,647 139 — 1,786 1,344 44 (6 ) 1,382 Mortgage-backed commercial 41 — (3 ) 38 41 1 — 42 Asset-backed 352 4 — 356 365 3 — 368 Corporate debt 1,761 97 (4 ) 1,854 1,327 37 (1 ) 1,363 Total available-for-sale securities (a) (b) (c) (d) (e) $ 28,137 $ 1,104 $ (16 ) $ 29,225 $ 29,967 $ 390 $ (73 ) $ 30,284 Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 1,376 $ 86 $ — $ 1,462 $ 1,547 $ 38 $ (6 ) $ 1,579 Asset-backed retained notes 14 — — 14 21 — — 21 Total held-to-maturity securities (e) (f) (g) $ 1,390 $ 86 $ — $ 1,476 $ 1,568 $ 38 $ (6 ) $ 1,600 (a) Certain entities related to our Insurance operations are required to deposit securities with state regulatory authorities. These deposited securities totaled $13 million and $12 million at June 30, 2020 , and December 31, 2019 , respectively. (b) Certain available-for-sale securities are included in fair value hedging relationships. Refer to Note 18 for additional information. (c) Available-for-sale securities with a fair value of $215 million and $1.9 billion at June 30, 2020 , and December 31, 2019 , respectively, were pledged to secure advances from the FHLB, repurchase agreements, other short-term borrowings, or for other purposes as required by contractual obligation or law. Under these agreements, we granted the counterparty the right to sell or pledge $215 million and $118 million of the underlying investment securities at June 30, 2020 , and December 31, 2019 , respectively. (d) Totals do not include accrued interest receivable, which was $90 million and $98 million at June 30, 2020 , and December 31, 2019 , respectively. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet . (e) There was no allowance for credit losses recorded at June 30, 2020 , as management determined that credit losses did not exist for our portfolio of available-for-sale and held-to-maturity securities. (f) Held-to-maturity securities with a fair value of $915 million at December 31, 2019 , were pledged to secure advances from the FHLB. We did not pledge any held-to-maturity securities at June 30, 2020 . (g) Totals do not include accrued interest receivable, which was $3 million at both June 30, 2020 , and December 31, 2019 . Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet
Investments Classified by Contractual Maturity Date	The maturity distribution of debt securities outstanding is summarized in the following tables based upon contractual maturities. Call or prepayment options may cause actual maturities to differ from contractual maturities. Total Due in one year or less Due after one year through five years Due after five years through ten years Due after ten years ($ in millions) Amount Yield Amount Yield Amount Yield Amount Yield Amount Yield June 30, 2020 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 807 1.2 % $ 14 0.3 % $ 709 1.1 % $ 84 1.7 % $ — — % U.S. States and political subdivisions 913 3.2 20 2.5 88 2.4 176 2.9 629 3.4 Foreign government 162 2.1 8 1.7 79 2.3 75 2.0 — — Agency mortgage-backed residential 19,884 3.2 — — — — 44 2.0 19,840 3.2 Mortgage-backed residential 3,425 3.2 — — — — — — 3,425 3.2 Agency mortgage-backed commercial 1,786 2.5 — — 3 3.3 1,247 2.6 536 2.2 Mortgage-backed commercial 38 3.6 — — — — — — 38 3.6 Asset-backed 356 3.4 — — 294 3.5 28 2.6 34 3.1 Corporate debt 1,854 3.0 153 2.9 705 2.9 973 3.1 23 2.4 Total available-for-sale securities $ 29,225 3.1 $ 195 2.6 $ 1,878 2.3 $ 2,627 2.8 $ 24,525 3.2 Amortized cost of available-for-sale securities $ 28,137 $ 193 $ 1,821 $ 2,431 $ 23,692 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,376 3.2 % $ — — % $ — — % $ — — % $ 1,376 3.2 % Asset-backed retained notes 14 2.4 — — 14 2.4 — — — — Total held-to-maturity securities $ 1,390 3.2 $ — — $ 14 2.4 $ — — $ 1,376 3.2 December 31, 2019 Fair value of available-for-sale securities (a) U.S. Treasury and federal agencies $ 2,048 1.5 % $ 65 2.1 % $ 1,590 1.4 % $ 393 1.7 % $ — — % U.S. States and political subdivisions 641 3.1 22 2.7 75 2.3 159 2.8 385 3.4 Foreign government 186 1.9 35 0.4 65 2.3 86 2.3 — — Agency mortgage-backed residential 21,404 3.2 — — — — 47 2.0 21,357 3.2 Mortgage-backed residential 2,850 3.2 — — — — — — 2,850 3.2 Agency mortgage-backed commercial 1,382 2.9 — — 3 3.2 1,109 3.0 270 2.4 Mortgage-backed commercial 42 3.5 — — — — — — 42 3.5 Asset-backed 368 3.5 — — 317 3.6 5 2.7 46 3.0 Corporate debt 1,363 3.2 125 2.9 580 3.0 649 3.4 9 3.3 Total available-for-sale securities $ 30,284 3.1 $ 247 2.3 $ 2,630 2.1 $ 2,448 2.8 $ 24,959 3.2 Amortized cost of available-for-sale securities $ 29,967 $ 246 $ 2,624 $ 2,378 $ 24,719 Amortized cost of held-to-maturity securities Agency mortgage-backed residential $ 1,547 3.2 % $ — — % $ — — % $ — — % $ 1,547 3.2 % Asset-backed retained notes 21 2.2 — — 21 2.2 — — — — Total held-to-maturity securities $ 1,568 3.2 $ — — $ 21 2.2 $ — — $ 1,547 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) 2020 2019 2020 2019 Taxable interest $ 177 $ 220 $ 382 $ 434 Taxable dividends 5 3 10 6 Interest and dividends exempt from U.S. federal income tax 5 4 8 9 Interest and dividends on investment securities $ 187 $ 227 $ 400 $ 449
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. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Available-for-sale securities Gross realized gains $ 19 $ 24 $ 124 $ 34 Gross realized losses (a) — — — (1 ) Net realized gains on available-for-sale securities 19 24 124 33 Net realized gain on equity securities 80 10 81 39 Net unrealized gain (loss) on equity securities 89 5 (96 ) 75 Other gain on investments, net $ 188 $ 39 $ 109 $ 147 (a) Certain available-for-sale securities were sold at a loss during the six months ended June 30, 2019 , as a result of identifiable market or credit events, 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.
Held to Maturity Debt Securities by Credit Quality	The following table presents the credit quality of our held-to-maturity securities, based on the latest available information as of June 30, 2020 . The credit ratings are sourced from nationally recognized statistical rating organizations, which include S&P, Moody’s, and Fitch, and represent a composite of the ratings or, where credit ratings cannot be sourced from the agencies, are presented based on the asset type. All our held-to-maturity securities were current in their payment of principal and interest as of June 30, 2020 . We have not recorded any interest income reversals on our held-to-maturity securities during the six months ended June 30, 2020 . June 30, 2020 ($ in millions) AAA AA Total (a) Debt securities Agency mortgage-backed residential $ — $ 1,376 $ 1,376 Asset-backed retained notes 14 — 14 Total held-to-maturity securities $ 14 $ 1,376 $ 1,390 (a) Rating agencies indicate that they base their ratings on many quantitative and qualitative factors, which may include capital adequacy, liquidity, asset quality, business mix, level and quality of earnings, and the current operating, legislative, and regulatory environment. A credit rating is not a recommendation to buy, sell, or hold securities, and the ratings are subject to revision or withdrawal at any time by the assigning rating agency.
Schedule of Unrealized Loss on Investments	The following table summarizes held-to-maturity securities in an unrealized loss position at December 31, 2019, prior to the date of adoption of the amendments to the credit loss standard, and as defined by the previous accounting guidance in effect at that time. December 31, 2019 Less than 12 months 12 months or longer ($ in millions) Fair value Unrealized loss Fair value Unrealized loss Held-to-maturity securities Debt securities Agency mortgage-backed residential $ 283 $ (6 ) $ — $ — Asset-backed retained notes — — 3 — Total held-to-maturity debt securities $ 283 $ (6 ) $ 3 $ — The table below summarizes available-for-sale securities in an unrealized loss position, which we evaluated to determine if a credit loss exists requiring the recognition of an allowance for credit losses. For additional information on our methodology, refer to Note 1 . As of June 30, 2020 , we did not have the intent to sell the available-for-sale 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, management determined that no credit reserves were required at June 30, 2020 . We have not recorded any interest income reversals on our available-for-sale securities during the six months ended June 30, 2020 . June 30, 2020 December 31, 2019 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 $ 9 $ — $ — $ — $ 1,267 $ (11 ) $ 279 $ (6 ) U.S. States and political subdivisions 55 — 5 (1 ) 72 (1 ) 5 — Foreign government 2 — — — 40 (1 ) 3 — Agency mortgage-backed residential 404 (4 ) 5 — 4,606 (23 ) 908 (13 ) Mortgage-backed residential 350 (4 ) — — 613 (4 ) 203 (7 ) Agency mortgage-backed commercial — — — — 335 (6 ) — — Mortgage-backed commercial 34 (3 ) — — — — — — Asset-backed 38 — 1 — 8 — 11 — Corporate debt 80 (3 ) 14 (1 ) 71 — 41 (1 ) Total available-for-sale securities $ 972 $ (14 ) $ 25 $ (2 ) $ 7,012 $ (46 ) $ 1,450 $ (27 )

Finance Receivables and Loans_2

Finance Receivables and Loans, Net (Tables)	6 Months Ended
	Jun. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Schedule of Accounts, Notes, Loans and Financing Receivable	The composition of finance receivables and loans reported at amortized cost basis was as follows. ($ in millions) June 30, 2020 December 31, 2019 Consumer automotive (a) $ 72,712 $ 72,390 Consumer mortgage Mortgage Finance (b) 16,429 16,181 Mortgage — Legacy (c) 984 1,141 Total consumer mortgage 17,413 17,322 Consumer other (d) 240 212 Total consumer 90,365 89,924 Commercial Commercial and industrial Automotive 17,755 28,332 Other 5,315 5,014 Commercial real estate 4,799 4,961 Total commercial 27,869 38,307 Total finance receivables and loans (e) (f) $ 118,234 $ 128,231 (a) Certain finance receivables and loans are included in fair value hedging relationships. Refer to Note 18 for additional information. (b) Includes loans originated as interest-only mortgage loans of $8 million and $11 million at June 30, 2020 , and December 31, 2019 , respectively, 33% of which are expected to start principal amortization in 2020. The remainder of these loans have exited the interest-only period. (c) Includes loans originated as interest-only mortgage loans of $171 million and $212 million at June 30, 2020 , and December 31, 2019 , respectively, of which 99% have exited the interest-only period. (d) Includes $8 million and $11 million of finance receivables at June 30, 2020 , and December 31, 2019 , respectively, for which we have elected the fair value option. (e) Totals include net unearned income, unamortized premiums and discounts, and deferred fees and costs of $2.0 billion at June 30, 2020 . (f) Totals do not include accrued interest receivable, which was $995 million and $488 million at June 30, 2020 , and December 31, 2019 , respectively. Accrued interest receivable is included in other assets on our Condensed Consolidated Balance Sheet.
Allowance for Credit Losses on Financing Receivables	The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans for the three and six months ended June 30, 2020, and includes the cumulative effect of adopting ASU 2016-13. Three months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at April 1, 2020 $ 2,833 $ 39 $ 45 $ 328 $ 3,245 Charge-offs (b) (245 ) (2 ) (4 ) (40 ) (291 ) Recoveries 108 4 — 1 113 Net charge-offs (137 ) 2 (4 ) (39 ) (178 ) Provision for credit losses 269 1 6 11 287 Other (2 ) — 2 — — Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $8 million of finance receivables at June 30, 2020 , for which we have elected the fair value option. (b) Represents the amount of the amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 for more information regarding our charge-off policies. Six months ended June 30, 2020 ($ in millions) Consumer automotive Consumer mortgage Consumer other (a) Commercial Total Allowance at December 31, 2019 $ 1,075 $ 46 $ 9 $ 133 $ 1,263 Cumulative effect of the adoption of Accounting Standards Update 2016-13 1,334 (6 ) 16 2 1,346 Allowance at January 1, 2020 2,409 40 25 135 2,609 Charge-offs (b) (618 ) (5 ) (9 ) (43 ) (675 ) Recoveries 219 9 1 2 231 Net charge-offs (399 ) 4 (8 ) (41 ) (444 ) Provision for credit losses 954 (2 ) 31 207 1,190 Other (1 ) — 1 (1 ) (1 ) Allowance at June 30, 2020 $ 2,963 $ 42 $ 49 $ 300 $ 3,354 (a) Excludes $8 million and $11 million of finance receivables at June 30, 2020 , and December 31, 2019, respectively, for which we have elected the fair value option. (b) Represents the amount of the amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis of a loan and the fair value of the collateral, less costs to sell. Refer to Note 1 for more information regarding our charge-off policies. The following tables present an analysis of the activity in the allowance for loan losses on finance receivables and loans for the three and six months ended June 30, 2019, prior to the adoption of ASU 2016-13, as defined by the previous accounting guidance in effect at that time. Three months ended June 30, 2019 ($ 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 amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis 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 2019 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 credit 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 amortized cost basis directly written off. For consumer and commercial loans, the loss from a charge-off is measured as the difference between the amortized cost basis 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 2019 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) 2020 2019 2020 2019 Consumer automotive $ — $ — $ — $ 20 Total sales and transfers (a) $ — $ — $ — $ 20 (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 were transferred to held-for-sale during 2018, 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) 2020 2019 2020 2019 Consumer automotive $ 635 $ 218 $ 995 $ 317 Consumer mortgage 1,870 678 2,354 1,913 Commercial 1 3 1 3 Total purchases of finance receivables and loans $ 2,506 $ 899 $ 3,350 $ 2,233
Schedule of Financing Receivables, Non Accrual Status	The following table presents the amortized cost of our finance receivables and loans on nonaccrual status as of the beginning or end of the three months and six months ended June 30, 2020 . All consumer or commercial finance receivables and loans that were 90 days or more past due were on nonaccrual status as of June 30, 2020 , and December 31, 2019 . June 30, 2020 ($ in millions) Nonaccrual status at Jan. 1, 2020 Nonaccrual status at April 1, 2020 Nonaccrual status Nonaccrual with no allowance (a) Consumer automotive $ 762 $ 1,077 $ 1,250 $ 633 Consumer mortgage Mortgage Finance 17 22 27 6 Mortgage — Legacy 40 40 36 28 Total consumer mortgage 57 62 63 34 Consumer other 2 1 1 — Total consumer 821 1,140 1,314 667 Commercial Commercial and industrial Automotive 73 86 80 13 Other 138 162 132 78 Commercial real estate 4 8 6 6 Total commercial 215 256 218 97 Total consumer and commercial finance receivables and loans $ 1,036 $ 1,396 $ 1,532 $ 764 (a) Represents a component of nonaccrual status at end of period.
Impaired Financing Receivables	The following table presents information about our impaired finance receivables and loans at December 31, 2019, prior to the date of adoption of the amendments to the credit loss standard and as defined by the previous accounting guidance in effect at that time. December 31, 2019 ($ in millions) Unpaid principal balance (a) Gross carrying value Impaired with no allowance Impaired with an allowance Allowance for impaired loans Consumer automotive $ 553 $ 538 $ 113 $ 425 $ 38 Consumer mortgage Mortgage Finance 14 14 6 8 — Mortgage — Legacy 199 194 64 130 18 Total consumer mortgage 213 208 70 138 18 Total consumer 766 746 183 563 56 Commercial Commercial and industrial Automotive 73 73 1 72 12 Other 170 138 73 65 21 Commercial real estate 4 4 4 — — Total commercial 247 215 78 137 33 Total consumer and commercial finance receivables and loans $ 1,013 $ 961 $ 261 $ 700 $ 89 (a) Adjusted for charge-offs.
Schedule of Average Balance And Interest Income Of Impaired Finance Receivables	The following table presents average balance and interest income for our impaired finance receivables and loans for the three months and six months ended June 30, 2019 , prior to the date of adoption of the amendments to the credit loss standard and as defined by the previous accounting guidance in effect at that time. Three months ended June 30, 2019 Six months ended June 30, 2019 ($ in millions) Average balance Interest income Average balance Interest income Consumer automotive $ 498 $ 9 $ 498 $ 17 Consumer mortgage Mortgage Finance 14 — 15 — Mortgage — Legacy 209 2 211 5 Total consumer mortgage 223 2 226 5 Total consumer 721 11 724 22 Commercial Commercial and industrial Automotive 113 — 143 1 Other 108 — 117 — Commercial real estate 6 — 6 — Total commercial 227 — 266 1 Total consumer and commercial finance receivables and loans $ 948 $ 11 $ 990 $ 23
Schedule Of Pass And Criticized Credit Quality Indicators Of Finance Receivables	The following table presents historical credit quality indicators for our commercial finance receivables and loans at December 31, 2019, prior to the date of adoption of the amendments to the credit loss standard and as defined by the previous accounting guidance in effect at that time. December 31, 2019 ($ in millions) Pass Criticized (a) Total Commercial and industrial Automotive $ 25,235 $ 3,097 $ 28,332 Other 4,225 789 5,014 Commercial real estate 4,620 341 4,961 Total commercial $ 34,080 $ 4,227 $ 38,307 (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.
Troubled Debt Restructurings on Financing Receivables	The following tables present information related to finance receivables and loans recorded at amortized cost modified in connection with a TDR during the period. 2020 2019 Three months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive (a) 21,293 $ 323 $ 297 5,598 $ 96 $ 85 Consumer mortgage Mortgage Finance (b) 19 11 11 2 — — Mortgage — Legacy (c) 23 3 3 18 3 3 Total consumer mortgage 42 14 14 20 3 3 Total consumer 21,335 337 311 5,618 99 88 Commercial Commercial and industrial Automotive 2 31 26 — — — Other 1 23 7 1 22 6 Total commercial 3 54 33 1 22 6 Total consumer and commercial finance receivables and loans 21,338 $ 391 $ 344 5,619 $ 121 $ 94 (a) Includes 13,615 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $191 million at June 30, 2020. (b) Includes 19 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $11 million at June 30, 2020. (c) Includes 20 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $2 million at June 30, 2020. 2020 2019 Six months ended June 30, ($ in millions) Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Number of loans Pre-modification amortized cost basis Post-modification amortized cost basis Consumer automotive (a) 44,093 $ 663 $ 615 13,025 $ 225 $ 196 Consumer mortgage Mortgage Finance (b) 29 15 15 3 — — Mortgage — Legacy (c) 55 7 7 38 6 6 Total consumer mortgage 84 22 22 41 6 6 Total consumer 44,177 685 637 13,066 231 202 Commercial Commercial and industrial Automotive 3 38 33 6 41 41 Other 1 23 7 1 22 6 Total commercial 4 61 40 7 63 47 Total consumer and commercial finance receivables and loans 44,181 $ 746 $ 677 13,073 $ 294 $ 249 (a) Includes 30,382 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $429 million at June 30, 2020. (b) Includes 27 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $14 million at June 30, 2020. (c) Includes 35 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $4 million at June 30, 2020.
Finance receivables and loans redefaulted during the period	loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $429 million at June 30, 2020. (b) Includes 27 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $14 million at June 30, 2020. (c) Includes 35 loans modified as a result of COVID-19 with both a pre-modification and post-modification amount of $4 million at June 30, 2020. The following tables present information about finance receivables and loans recorded at amortized cost that have redefaulted during the reporting period and were within 12 months or less of being modified as a TDR. Redefault is when finance receivables and loans meet the requirements for evaluation under our charge-off policy (refer to Note 1 for additional information) except for commercial finance receivables and loans, where redefault is defined as 90 days past due. 2020 2019 Three months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 1,119 $ 11 $ 8 1,752 $ 20 $ 12 Total consumer finance receivables and loans 1,119 $ 11 $ 8 1,752 $ 20 $ 12 2020 2019 Six months ended June 30, ($ in millions) Number of loans Amortized cost Charge-off amount Number of loans Amortized cost Charge-off amount Consumer automotive 2,283 $ 24 $ 17 3,961 $ 46 $ 28 Total consumer finance receivables and loans 2,283 $ 24 $ 17 3,961 $ 46 $ 28
Consumer portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable Credit Quality Indicators	The following table presents the amortized cost basis of our consumer finance receivables and loans by credit quality indicator based on delinquency status at June 30, 2020 , and origination year. Origination year Revolving loans converted to term June 30, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Consumer automotive Current $ 13,963 $ 23,534 $ 15,405 $ 9,404 $ 5,152 $ 2,905 $ — $ — $ 70,363 30–59 days past due 52 410 374 270 176 114 — — 1,396 60–89 days past due 17 122 120 87 59 39 — — 444 90 or more days past due 9 121 136 107 79 57 — — 509 Total consumer automotive 14,041 24,187 16,035 9,868 5,466 3,115 — — 72,712 Consumer mortgage Mortgage Finance Current 2,047 3,006 2,380 3,151 1,375 4,364 — 1 16,324 30–59 days past due 9 7 12 14 11 30 — — 83 60–89 days past due — 1 3 1 4 3 — — 12 90 or more days past due — — 2 1 1 6 — — 10 Total Mortgage Finance 2,056 3,014 2,397 3,167 1,391 4,403 — 1 16,429 Mortgage — Legacy Current — — — — — 482 343 120 945 30–59 days past due — — — — — 8 2 2 12 60–89 days past due — — — — — 3 1 — 4 90 or more days past due — — — — — 17 5 1 23 Total Mortgage — Legacy — — — — — 510 351 123 984 Total consumer mortgage 2,056 3,014 2,397 3,167 1,391 4,913 351 124 17,413 Consumer other Current 109 86 25 7 1 — — — 228 30–59 days past due 1 — — — — — — — 1 60–89 days past due 1 1 — — — — — — 2 90 or more days past due — 1 — — — — — — 1 Total consumer other (a) 111 88 25 7 1 — — — 232 Total consumer $ 16,208 $ 27,289 $ 18,457 $ 13,042 $ 6,858 $ 8,028 $ 351 $ 124 $ 90,357 (a) Excludes $8 million of finance receivables at June 30, 2020 , for which we have elected the fair value option.
Past Due Financing Receivables	The following table presents an analysis of our past-due finance receivables and loans recorded at amortized cost basis at December 31, 2019. ($ 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 December 31, 2019 Consumer automotive $ 2,185 $ 590 $ 367 $ 3,142 $ 69,248 $ 72,390 Consumer mortgage Mortgage Finance 56 11 9 76 16,105 16,181 Mortgage — Legacy 25 8 28 61 1,080 1,141 Total consumer mortgage 81 19 37 137 17,185 17,322 Consumer other (a) 3 2 2 7 194 201 Total consumer $ 2,269 $ 611 $ 406 $ 3,286 $ 86,627 $ 89,913 (a) Excludes $11 million of finance receivables at December 31, 2019 , for which we have elected the fair value option.
Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable Credit Quality Indicators	The following table presents the amortized cost basis of our commercial finance receivables and loans by credit quality indicator based on risk rating at June 30, 2020 , and origination year. Origination year Revolving loans converted to term June 30, 2020 ($ in millions) 2020 2019 2018 2017 2016 2015 and prior Revolving loans Total Commercial and industrial Automotive Pass $ 785 $ 281 $ 107 $ 112 $ 72 $ 78 $ 13,802 $ — $ 15,237 Special mention 61 18 54 65 33 14 2,157 — 2,402 Substandard 1 2 — — — — 82 — 85 Doubtful — — 1 2 — — 28 — 31 Total automotive 847 301 162 179 105 92 16,069 — 17,755 Other Pass 419 631 338 299 117 98 1,912 73 3,887 Special mention — 202 256 225 94 119 293 38 1,227 Substandard — — — 38 — 133 19 11 201 Doubtful — — — — — — — — — Total other 419 833 594 562 211 350 2,224 122 5,315 Commercial real estate Pass 386 1,058 873 619 712 803 — 2 4,453 Special mention 16 71 62 69 84 31 — — 333 Substandard — — — 3 — 7 — — 10 Doubtful — — — — 2 1 — — 3 Total commercial real estate 402 1,129 935 691 798 842 — 2 4,799 Total commercial $ 1,668 $ 2,263 $ 1,691 $ 1,432 $ 1,114 $ 1,284 $ 18,293 $ 124 $ 27,869
Past Due Financing Receivables	The following table presents an analysis of our past-due commercial finance receivables and loans recorded at amortized cost basis. ($ 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, 2020 Commercial Commercial and industrial Automotive $ — $ 1 $ 48 $ 49 $ 17,706 $ 17,755 Other — — — — 5,315 5,315 Commercial real estate — — 6 6 4,793 4,799 Total commercial $ — $ 1 $ 54 $ 55 $ 27,814 $ 27,869 December 31, 2019 Commercial Commercial and industrial Automotive $ 34 $ — $ 28 $ 62 $ 28,270 $ 28,332 Other — — 17 17 4,997 5,014 Commercial real estate — — 4 4 4,957 4,961 Total commercial $ 34 $ — $ 49 $ 83 $ 38,224 $ 38,307

Leasing (Tables)

Leasing (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Investment in Operating Leases	The following table details our total investment in operating leases. ($ in millions) June 30, 2020 December 31, 2019 Assets Operating lease right-of-use assets (a) $ 137 $ 168 Liabilities Operating lease liabilities (b) $ 163 $ 196 (a) Included in other assets on our Condensed Consolidated Balance Sheet . (b) 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, 2020 , and that have noncancelable lease terms expiring after June 30, 2020 . ($ in millions) 2020 $ 25 2021 43 2022 30 2023 20 2024 13 2025 and thereafter 46 Total undiscounted cash flows 177 Difference between undiscounted cash flows and discounted cash flows (14 ) Total lease liability $ 163
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) 2020 2019 2020 2019 Operating lease expense $ 11 $ 12 $ 24 $ 23 Variable lease expense 2 2 4 4 Total lease expense, net (a) $ 13 $ 14 $ 28 $ 27 (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, 2020 December 31, 2019 Vehicles $ 10,656 $ 10,426 Accumulated depreciation (1,568 ) (1,562 ) Investment in operating leases, net $ 9,088 $ 8,864
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 noncancelable lease terms expiring after June 30, 2020 . ($ in millions) 2020 $ 722 2021 1,114 2022 635 2023 228 2024 26 2025 and thereafter 1 Total lease payments from operating leases $ 2,726
Depreciation Expense on Operating Lease Assets	We recognized operating lease revenue of $343 million and $710 million , and $363 million and $724 million for the three months and six months ended June 30, 2020 , and June 30, 2019 , respectively. Depreciation expense on operating lease assets includes remarketing gains and losses recognized on the sale of operating lease assets. The following table summarizes the components of depreciation expense on operating lease assets. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Depreciation expense on operating lease assets (excluding remarketing losses and gains) (a) $ 241 $ 262 $ 491 $ 523 Remarketing losses (gains), net 11 (23 ) 9 (38 ) Net depreciation expense on operating lease assets $ 252 $ 239 $ 500 $ 485 (a) Includes variable lease payments related to excess mileage and excessive wear and tear on vehicles of $5 million and $12 million during the three months and six months ended June 30, 2020 , respectively, and $5 million and $9 million during the three months and six months ended June 30, 2019 .
Finance Lease, Liability, Maturity	The following table presents future minimum rental payments we have the right to receive under finance leases with noncancelable lease terms expiring after June 30, 2020 . ($ in millions) 2020 $ 75 2021 149 2022 112 2023 78 2024 46 2025 and thereafter 31 Total undiscounted cash flows 491 Difference between undiscounted cash flows and discounted cash flows (49 ) Present value of lease payments recorded as lease receivable $ 442

Securitizations and Variable _2

Securitizations and Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2020
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, 2020 On-balance sheet variable interest entities Consumer automotive $ 19,760 (b) $ 4,431 (c) Commercial automotive 6,257 2,150 Off-balance-sheet variable interest entities Consumer automotive 15 (d) — $ 276 $ 290 (e) Commercial other 1,170 (f) 402 (g) — 1,478 (h) Total $ 27,202 $ 6,983 $ 276 $ 1,768 December 31, 2019 On-balance sheet variable interest entities Consumer automotive $ 20,376 (b) $ 6,070 (c) Commercial automotive 8,009 3,049 Off-balance-sheet variable interest entities Consumer automotive (i) 23 (d) — $ 417 $ 440 (e) Commercial other 1,079 (f) 378 (g) — 1,397 (h) Total $ 29,487 $ 9,497 $ 417 $ 1,837 (a) Asset values represent the current unpaid principal balance of outstanding consumer finance receivables and loans within the VIEs. (b) Includes $9.4 billion and $9.0 billion of assets that were not encumbered by VIE beneficial interests held by third parties at June 30, 2020 , and December 31, 2019 , respectively. Ally or consolidated affiliates hold the interests in these assets. (c) Includes $82 million and $21 million of liabilities that were not obligations to third-party beneficial interest holders at June 30, 2020 , and December 31, 2019 , respectively. (d) Represents retained notes and certificated residual interests, of which $13 million and $21 million were classified as held-to-maturity securities at June 30, 2020 , and December 31, 2019 , respectively, and $2 million were classified as other assets at both June 30, 2020 , and December 31, 2019 . 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, warranty, and covenant 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 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. (i) During the year ended December 31, 2019 , we indicated our intent to exercise a clean-up call option related to a nonconsolidated securitization-related VIE. The option enables us to repurchase the remaining transferred financial assets at our discretion once the asset pool declines to a predefined level and redeem the related outstanding debt. As a result of this event, we became the primary beneficiary of the VIE, which included $48 million of consumer automotive loans and $45 million of related debt, and the VIE was consolidated on our Condensed Consolidated Balance Sheet. The related amounts were removed from assets sold to nonconsolidated VIEs and maximum exposure to loss in nonconsolidated VIEs.
Schedule Of Cash Flow Received And Paid To Nonconsolidated Securitization Entities	The following table summarizes cash flows received and paid related to SPEs and asset-backed financings where the transfer is accounted for as a sale and we have a continuing involvement with the transferred consumer automotive assets (for example, servicing) that were outstanding during the six months ended June 30, 2020 , and 2019 . Additionally, this table contains information regarding cash flows received from and paid to nonconsolidated SPEs that existed during each period. Six months ended June 30, ($ in millions) Consumer automotive 2020 Cash flows received on retained interests in securitization entities $ 8 Servicing fees 2 Cash disbursements for repurchases during the period (2 ) 2019 Cash flows received on retained interests in securitization entities $ 13 Servicing fees 6 Cash disbursements for repurchases during the period (1 )
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, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Off-balance-sheet securitization entities Consumer automotive $ 276 $ 417 $ 5 $ 6 Whole-loan sales (a) Consumer automotive 103 207 1 2 Total $ 379 $ 624 $ 6 $ 8 (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) 2020 2019 2020 2019 Off-balance-sheet securitization entities Consumer automotive $ — $ 2 $ 1 $ 4 Whole-loan sales (a) Consumer automotive — 1 — 1 Total $ — $ 3 $ 1 $ 5 (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, 2020
Other Assets [Abstract]
Schedule of Other Assets	The components of other assets were as follows. ($ in millions) June 30, 2020 December 31, 2019 Property and equipment at cost $ 1,433 $ 1,332 Accumulated depreciation (748 ) (686 ) Net property and equipment 685 646 Accrued interest, fees, and rent receivables 1,125 589 Nonmarketable equity investments (a) 1,080 1,232 Investment in qualified affordable housing projects (b) 930 830 Restricted cash held for securitization trusts (c) 760 738 Equity-method investments (d) 361 358 Goodwill 343 393 Net deferred tax assets 161 58 Other accounts receivable (e) 150 117 Restricted cash and cash equivalents (f) 73 87 Net intangible assets (g) 60 69 Fair value of derivative contracts in receivable position (h) 14 64 Other assets 979 892 Total other assets $ 6,721 $ 6,073 (a) Includes investments in FHLB stock of $551 million and $701 million at June 30, 2020 , and December 31, 2019 , respectively; FRB stock of $449 million at both June 30, 2020 , and December 31, 2019 ; and equity securities without a readily determinable fair value of $80 million and $82 million at June 30, 2020 , and December 31, 2019 , respectively, measured at cost with adjustments for impairment and observable changes in price. During the three and six months ended June 30, 2020 , we recorded $4 million and $5 million of impairments and downward adjustments related to equity securities without a readily determinable fair value, respectively. Through June 30, 2020 , we recorded $10 million of cumulative upward adjustments and $11 million of cumulative impairments and downward adjustments related to equity securities without a readily determinable fair value held at June 30, 2020 . (b) Investment in qualified affordable housing projects are accounted for using the proportional amortization method of accounting and include $397 million and $372 million of unfunded commitments to provide additional capital contributions to investees at June 30, 2020 , and December 31, 2019 , respectively. Substantially all of the unfunded commitments at June 30, 2020 , 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 CRA program. (e) Primarily represents the proceeds from the sale of investment securities that have not settled as of the balance sheet date. (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) Includes gross intangible assets of $111 million at both June 30, 2020 , and December 31, 2019 , and accumulated amortization of $51 million and $42 million at June 30, 2020 , and December 31, 2019 , respectively. (h) For additional information on derivative instruments and hedging activities, refer to Note 18 .
Schedule of Goodwill	The carrying balance of goodwill by reportable operating segment was as follows. ($ in millions) Automotive Finance operations Insurance operations Corporate and Other (a) Total Goodwill at December 31, 2019 $ 20 $ 27 $ 346 $ 393 Impairment losses — — (50 ) (50 ) Goodwill at June 30, 2020 $ 20 $ 27 $ 296 $ 343 (a) Includes $153 million of goodwill arising from the acquisition of Health Credit Services at both June 30, 2020 , and December 31, 2019 , and $143 million and $193 million of goodwill associated with Ally Invest at June 30, 2020 , and December 31, 2019 , respectively. For additional information on the acquisition of Health Credit Services, refer to Note 2 .

Deposit Liabilities (Tables)

Deposit Liabilities (Tables)	6 Months Ended
	Jun. 30, 2020
Deposits [Abstract]
Deposit Liabilities, Type	Deposit liabilities consisted of the following. ($ in millions) June 30, 2020 December 31, 2019 Noninterest-bearing deposits $ 134 $ 119 Interest-bearing deposits Savings and money-market checking accounts 72,561 62,486 Certificates of deposit 58,340 58,146 Other deposits 1 1 Total deposit liabilities $ 131,036 $ 120,752

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Short-term Debt	The following table presents the composition of our short-term borrowings portfolio. June 30, 2020 December 31, 2019 ($ in millions) Unsecured Secured (a) Total Unsecured Secured (a) Total Demand notes $ 2,510 $ — $ 2,510 $ 2,581 $ — $ 2,581 Federal Home Loan Bank — 1,100 1,100 — 2,950 2,950 Securities sold under agreements to repurchase — 79 79 — — — Total short-term borrowings $ 2,510 $ 1,179 $ 3,689 $ 2,581 $ 2,950 $ 5,531 (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, 2020 December 31, 2019 ($ in millions) Unsecured Secured Total Unsecured Secured Total Long-term debt (a) Due within one year $ 1,063 $ 7,642 $ 8,705 $ 2,214 $ 7,005 $ 9,219 Due after one year 10,146 10,325 20,471 8,990 15,818 24,808 Total long-term debt (b) (c) $ 11,209 $ 17,967 $ 29,176 $ 11,204 $ 22,823 $ 34,027 (a) Includes basis adjustments related to the application of hedge accounting. (b) Includes $2.6 billion of trust preferred securities at both June 30, 2020 , and December 31, 2019 . (c) Includes advances net of hedge basis adjustment from the FHLB of Pittsburgh of $11.5 billion and $13.3 billion at June 30, 2020 , and December 31, 2019 , respectively.
Schedule of Maturities of Long-term Debt	The following table presents the scheduled remaining maturity of long-term debt at June 30, 2020 , assuming no early redemptions will occur. The amounts below include adjustments to the carrying value resulting from the application of hedge accounting. The actual payment of secured debt may vary based on the payment activity of the related pledged assets. ($ in millions) 2020 2021 2022 2023 2024 2025 and thereafter Total Unsecured Long-term debt $ 474 $ 701 $ 1,123 $ 865 $ 1,475 $ 7,663 $ 12,301 Original issue discount (25 ) (53 ) (57 ) (63 ) (69 ) (825 ) (1,092 ) Total unsecured 449 648 1,066 802 1,406 6,838 11,209 Secured Long-term debt 2,571 9,253 5,435 588 102 18 17,967 Total long-term debt $ 3,020 $ 9,901 $ 6,501 $ 1,390 $ 1,508 $ 6,856 $ 29,176
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, 2020 December 31, 2019 ($ in millions) Total (a) Ally Bank Total (a) Ally Bank Investment securities (b) $ 72 $ 72 $ 2,698 $ 2,698 Mortgage assets held-for-investment and lending receivables 17,256 17,256 17,135 17,135 Consumer automotive finance receivables 12,341 11,490 13,481 11,534 Commercial automotive finance receivables 10,921 10,921 12,890 12,890 Total assets restricted as collateral (c) (d) $ 40,590 $ 39,739 $ 46,204 $ 44,257 Secured debt $ 19,146 (e) $ 18,410 $ 25,773 (e) $ 24,069 (a) Ally Bank is a component of the total column. (b) A portion of the restricted investment securities at June 30, 2020 , was 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 $22.1 billion and $24.8 billion at June 30, 2020 , and December 31, 2019 , 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, 2020 , and December 31, 2019 . 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 11 for additional information. (e) Includes $1.2 billion and $3.0 billion of short-term borrowings at June 30, 2020 , and December 31, 2019 , respectively.
Schedule Of Committed Funding Facilities	Committed Secured Credit Facilities Outstanding Unused capacity (a) Total capacity ($ in millions) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Parent funding Secured $ — $ 450 $ 1,550 $ 2,050 $ 1,550 $ 2,500 Total committed secured credit facilities $ — $ 450 $ 1,550 $ 2,050 $ 1,550 $ 2,500 (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, 2020
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, 2020 December 31, 2019 Accounts payable $ 904 $ 535 Unfunded commitments for investment in qualified affordable housing projects 397 372 Employee compensation and benefits 229 296 Reserves for insurance losses and loss adjustment expenses 132 122 Deferred revenue 76 36 Net deferred tax liabilities 24 67 Cash collateral received from counterparties 12 48 Fair value of derivative contracts in payable position (a) 2 5 Other liabilities 523 491 Total accrued expenses and other liabilities $ 2,299 $ 1,972 (a) For additional information on derivative instruments and hedging activities, refer to Note 18 .

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive (Loss) Income (Tables)	6 Months Ended
	Jun. 30, 2020
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following tables present changes, net of tax, in each component of accumulated other comprehensive income (loss). 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 income (loss) 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 Balance at April 1, 2020 $ 661 $ 18 $ 130 $ (103 ) $ 706 Net change 122 1 (14 ) — 109 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103 ) $ 815 (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 18 . 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 income (loss) Balance at December 31, 2018 $ (481 ) $ 18 $ 19 $ (95 ) $ (539 ) Cumulative effect of changes in accounting principles, net of tax Adoption of Accounting Standards Update 2017-08 (c) 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 Balance at December 31, 2019 $ 208 $ 19 $ 2 $ (106 ) $ 123 Net change 575 — 114 3 692 Balance at June 30, 2020 $ 783 $ 19 $ 116 $ (103 ) $ 815 (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 18 . (c) Refer to the section titled Recently Adopted Accounting Standards in Note 1 to the Consolidated Financial Statements in our 2019 Annual Report on Form 10-K 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, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 175 $ (38 ) $ 137 Less: Net realized gains reclassified to income from continuing operations 19 (a) (4 ) (b) 15 Net change 156 (34 ) 122 Translation adjustments Net unrealized gains arising during the period 6 (1 ) 5 Net investment hedges (c) Net unrealized losses arising during the period (5 ) 1 (4 ) Cash flow hedges (c) Less: Net realized gains reclassified to income from continuing operations 19 (5 ) 14 Other comprehensive income $ 138 $ (29 ) $ 109 (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 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 18 . 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 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 18 . Six months ended June 30, 2020 ($ in millions) Before tax Tax effect After tax Investment securities Net unrealized gains arising during the period $ 877 $ (206 ) $ 671 Less: Net realized gains reclassified to income from continuing operations 124 (a) (28 ) (b) 96 Net change 753 (178 ) 575 Translation adjustments Net unrealized losses arising during the period (7 ) 2 (5 ) 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 169 (41 ) 128 Less: Net realized gains reclassified to income from continuing operations 19 (5 ) 14 Net change 150 (36 ) 114 Defined benefit pension plans Net unrealized gains arising during the period 4 (1 ) 3 Other comprehensive income $ 907 $ (215 ) $ 692 (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 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 18 . 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 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 18 .

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2020
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) 2020 2019 2020 2019 Net income (loss) from continuing operations $ 242 $ 584 $ (77 ) $ 959 Loss from discontinued operations, net of tax (1 ) (2 ) (1 ) (3 ) Net income (loss) attributable to common stockholders $ 241 $ 582 $ (78 ) $ 956 Basic weighted-average common shares outstanding (b) 375,051 398,100 375,387 401,098 Diluted weighted-average common shares outstanding (b) (c) 375,762 399,916 375,387 402,921 Basic earnings per common share Net income (loss) from continuing operations $ 0.65 $ 1.47 $ (0.20 ) $ 2.39 Loss from discontinued operations, net of tax — — — (0.01 ) Net income (loss) $ 0.64 $ 1.46 (0.21 ) 2.39 Diluted earnings per common share Net income (loss) from continuing operations $ 0.64 $ 1.46 (0.20 ) 2.38 Loss from discontinued operations, net of tax — — — (0.01 ) Net income (loss) $ 0.64 $ 1.46 $ (0.21 ) $ 2.37 (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 . (c) Due to the antidilutive effect of the net loss from continuing operations for the six months ended June 30, 2020, basic weighted-average common shares outstanding was used to calculate basic and diluted earnings per share . During the three months and six months ended June 30, 2020, there were 2.3 million and 2.4 million , respectively, in shares underlying share-based awards excluded because their inclusion would have been antidilutive. There were no antidilutive shares during the three months and six months ended June 30, 2019.

Regulatory Capital and Other _2

Regulatory Capital and Other Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2020
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, 2020 December 31, 2019 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. $ 13,826 10.09 % $ 13,837 9.54 % 4.50 % (b) Ally Bank 16,918 13.21 16,627 12.30 4.50 6.50 % Tier 1 (to risk-weighted assets) Ally Financial Inc. $ 16,235 11.85 % $ 16,271 11.22 % 6.00 % 6.00 % Ally Bank 16,918 13.21 16,627 12.30 6.00 8.00 Total (to risk-weighted assets) Ally Financial Inc. $ 18,895 13.79 % $ 18,506 12.76 % 8.00 % 10.00 % Ally Bank 18,522 14.46 17,854 13.21 8.00 10.00 Tier 1 leverage (to adjusted quarterly average assets) (c) Ally Financial Inc. $ 16,235 8.93 % $ 16,271 9.08 % 4.00 % (b) Ally Bank 16,918 9.94 16,627 10.01 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% at both June 30, 2020 , and December 31, 2019 . Beginning October 1, 2020, Ally’s preliminary stress capital buffer requirement of 3.5% will comprise its capital conservation buffer requirement. Ally’s capital conservation buffer was 5.59% and 4.76% at June 30, 2020 , and December 31, 2019 , 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) (b) Number of common shares outstanding Cash dividends declared per common share (c) ($ in millions, except per share data; shares in thousands) Approximate dollar value Number of shares Beginning of period End of period 2019 First quarter $ 211 8,113 404,900 399,761 $ 0.17 Second quarter 229 7,775 399,761 392,775 0.17 Third quarter 300 9,287 392,775 383,523 0.17 Fourth quarter 299 9,554 383,523 374,332 0.17 2020 First quarter $ 104 3,838 374,332 373,155 $ 0.19 Second quarter — 53 373,155 373,837 0.19 (a) Includes shares of common stock withheld to cover income taxes owed by participants in our share-based incentive plans. (b) On March 17, 2020, we announced the voluntary suspension of our stock-repurchase program through its termination on June 30, 2020. We do not currently plan to implement a new stock-repurchase program or repurchase shares of our common stock, except in connection with compensation plans, for the remainder of 2020. Refer to the discussion below for further details about this action. (c) On July 14, 2020 , our Board declared a quarterly cash dividend of $0.19 per share on all common stock, payable on August 14, 2020 , to stockholders of record at the close of business on July 31, 2020 . 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, 2020
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, 2020 December 31, 2019 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 $ — $ — $ 11,215 $ — $ — $ 17,101 Purchased options — — — 62 — 14,100 Foreign exchange contracts Forwards — — 145 — 3 157 Total derivatives designated as accounting hedges — — 11,360 62 3 31,358 Derivatives not designated as accounting hedges Interest rate contracts Futures and forwards — — 117 — — 81 Written options 12 — 445 2 — 522 Purchased options — — — — — 416 Total interest rate risk 12 — 562 2 — 1,019 Foreign exchange contracts Futures and forwards — — 157 — 2 112 Total foreign exchange risk — — 157 — 2 112 Equity contracts Written options — 2 1 — — — Purchased options 2 — 1 — — — Total equity risk 2 2 2 — — — Total derivatives not designated as accounting hedges 14 2 721 2 2 1,131 Total derivatives $ 14 $ 2 $ 12,081 $ 64 $ 5 $ 32,489
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, 2020 December 31, 2019 June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Assets Available-for-sale securities (b) (c) $ 1,270 $ 1,217 $ 50 $ 18 $ 32 $ 18 Finance receivables and loans, net (d) 36,211 33,312 334 135 79 44 Liabilities Long-term debt $ 10,020 $ 11,995 $ 196 $ 24 $ 196 $ 127 (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 and includes $597 million and $230 million at June 30, 2020 , and December 31, 2019 , respectively, related to 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. Refer to Note 7 for a reconciliation of the amortized cost and fair value of available-for-sale securities. (c) The amount that is identified as the last of layer in the open hedge relationship was $490 million as of June 30, 2020 . The basis adjustment associated with the open last of layer relationship was a $3 million asset as of June 30, 2020 , which would be allocated across the entire remaining 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 $690 million and $200 million as of June 30, 2020 , and December 31, 2019 , respectively. The basis adjustment associated with the discontinued last of layer relationship was a $22 million asset as of June 30, 2020 , and a $2 million asset as of December 31, 2019 , which was allocated across the entire remaining pool upon termination of the hedge relationship. There were no open last-of-layer relationships at December 31, 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 $10.2 billion at both June 30, 2020 , and December 31, 2019 . The basis adjustment associated with the open last-of-layer relationship was a $255 million asset as of June 30, 2020 , and a $91 million asset as of December 31, 2019 , 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 $17.5 billion at June 30, 2020 , and $12.8 billion at December 31, 2019 . The basis adjustment associated with the discontinued last-of-layer relationship was a $79 million asset and $43 million asset as of June 30, 2020 , and December 31, 2019 , respectively, which was allocated across the entire remaining pool upon termination of the hedge relationship.
Schedule of Derivative Instruments Not Designated as Accounting Hedge	The following table summarizes the location and amounts of gains and losses on derivative instruments not designated as accounting hedges reported in our Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 (Loss) gain recognized in earnings Interest rate contracts Gain on mortgage and automotive loans, net $ — $ — $ (15 ) $ 1 Other income, net of losses (23 ) (2 ) (23 ) (7 ) Total interest rate contracts (23 ) (2 ) (38 ) (6 ) Foreign exchange contracts Other income, net of losses (5 ) (2 ) 3 (3 ) Total foreign exchange contracts (5 ) (2 ) 3 (3 ) Total loss recognized in earnings $ (28 ) $ (4 ) $ (35 ) $ (9 )
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 deposits Interest on long-term debt Three months ended June 30, ($ in millions) 2020 2019 2020 2019 2020 2019 2020 2019 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ — $ (19 ) Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — — 19 Hedged available-for-sale securities — — 4 2 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — (4 ) (2 ) — — — — Hedged fixed-rate consumer automotive loans (23 ) 98 — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans 23 (98 ) — — — — — — Total gain on fair value hedging relationships — — — — — — — — Gain (loss) on cash flow hedging relationships Interest rate contracts Hedged variable-rate commercial loans Reclassified from accumulated other comprehensive income into income 22 — — — — — — — Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — (2 ) — — — Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — — — — 4 Total gain (loss) on cash flow hedging relationships $ 22 $ — $ — $ — $ (2 ) $ — $ — $ 4 Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 1,630 $ 1,860 $ 197 $ 244 $ 541 $ 651 $ 318 $ 407 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) 2020 2019 2020 2019 2020 2019 2020 2019 (Loss) gain on fair value hedging relationships Interest rate contracts Hedged fixed-rate unsecured debt $ — $ — $ — $ — $ — $ — $ (170 ) $ (19 ) Derivatives designated as hedging instruments on fixed-rate unsecured debt — — — — — — 170 19 Hedged available-for-sale securities — — 45 12 — — — — Derivatives designated as hedging instruments on available-for-sale securities — — (45 ) (12 ) — — — — Hedged fixed-rate consumer automotive loans 225 141 — — — — — — Derivatives designated as hedging instruments on fixed-rate consumer automotive loans (225 ) (141 ) — — — — — — Total gain on fair value hedging relationships — — — — — — — — Gain (loss) on cash flow hedging relationships Interest rate contracts Hedged variable rate commercial loans Reclassified from accumulated other comprehensive income into income 25 — — — — — — — Hedged deposit liabilities Reclassified from accumulated other comprehensive income into income — — — — (5 ) 1 — — Hedged variable-rate borrowings Reclassified from accumulated other comprehensive income into income — — — — — — — 8 Total gain (loss) on cash flow hedging relationships $ 25 $ — $ — $ — $ (5 ) $ 1 $ — $ 8 Total amounts presented in the Condensed Consolidated Statement of Comprehensive Income $ 3,372 $ 3,667 $ 423 $ 484 $ 1,133 $ 1,243 $ 666 $ 826
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) 2020 2019 2020 2019 2020 2019 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 2 $ 6 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (6 ) (5 ) Amortization of deferred basis adjustments of available-for-sale securities — — (2 ) (1 ) — — Interest for qualifying accounting hedges of available-for-sale securities — — (2 ) — — — Amortization of deferred loan basis adjustments (13 ) (9 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (38 ) 11 — — — — Total (loss) gain on fair value hedging relationships (51 ) 2 (4 ) (1 ) (4 ) 1 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) 2020 2019 2020 2019 2020 2019 Gain (loss) on fair value hedging relationships Interest rate contracts Amortization of deferred unsecured debt basis adjustments $ — $ — $ — $ — $ 8 $ 12 Amortization of deferred secured debt basis adjustments (FHLB advances) — — — — (12 ) (11 ) Amortization of deferred basis adjustments of available-for-sale securities — — (3 ) (1 ) — — Interest for qualifying accounting hedges of available-for-sale securities — — (2 ) — — — Amortization of deferred loan basis adjustments (26 ) (13 ) — — — — Interest for qualifying accounting hedges of consumer automotive loans held-for-investment (47 ) 17 — — — — Total (loss) gain on fair value hedging relationships (73 ) 4 (5 ) (1 ) (4 ) 1 Gain on cash flow hedging relationships Interest rate contracts Interest for qualifying accounting hedges of variable-rate commercial loans 1 — — — — — Total gain on cash flow hedging relationships $ 1 $ — $ — $ — $ — $ 1
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. Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Interest rate contracts (Loss) gain recognized in other comprehensive income $ (19 ) $ 22 $ 150 $ 12
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 and the Condensed Consolidated Statement of Comprehensive Income . Three months ended June 30, Six months ended June 30, ($ in millions) 2020 2019 2020 2019 Foreign exchange contracts (a) (b) (Loss) gain recognized in other comprehensive income $ (6 ) $ (3 ) $ 6 $ (5 ) (a) There were no amounts excluded from effectiveness testing for the three months and six months ended June 30, 2020 , or 2019 . (b) Gains and losses reclassified from accumulated other comprehensive income 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, 2020 , or 2019 .

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2020
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, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 608 $ — $ 5 $ 613 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 807 — — 807 U.S. States and political subdivisions — 908 5 913 Foreign government 15 147 — 162 Agency mortgage-backed residential — 19,884 — 19,884 Mortgage-backed residential — 3,425 — 3,425 Agency mortgage-backed commercial — 1,786 — 1,786 Mortgage-backed commercial — 38 — 38 Asset-backed — 356 — 356 Corporate debt — 1,854 — 1,854 Total available-for-sale securities 822 28,398 5 29,225 Mortgage loans held-for-sale (b) — — 91 91 Finance receivables and loans, net Consumer other (b) — — 8 8 Interests retained in financial asset sales — — 1 1 Derivative contracts in a receivable position Interest rate — — 12 12 Other 2 — — 2 Total derivative contracts in a receivable position 2 — 12 14 Total assets $ 1,432 $ 28,398 $ 122 $ 29,952 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Other $ 2 — — $ 2 Total derivative contracts in a payable position 2 — — 2 Total liabilities $ 2 $ — $ — $ 2 (a) Our direct investment in any one industry did not exceed 11% . (b) Carried at fair value due to fair value option elections. Recurring fair value measurements December 31, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Investment securities Equity securities (a) $ 608 $ — $ 8 $ 616 Available-for-sale securities Debt securities U.S. Treasury and federal agencies 2,047 1 — 2,048 U.S. States and political subdivisions — 639 2 641 Foreign government 15 171 — 186 Agency mortgage-backed residential — 21,404 — 21,404 Mortgage-backed residential — 2,850 — 2,850 Agency mortgage-backed commercial — 1,382 — 1,382 Mortgage-backed commercial — 42 — 42 Asset-backed — 368 — 368 Corporate debt — 1,363 — 1,363 Total available-for-sale securities 2,062 28,220 2 30,284 Mortgage loans held-for-sale (b) — — 30 30 Finance receivables and loans, net Consumer other (b) — — 11 11 Interests retained in financial asset sales — — 2 2 Derivative contracts in a receivable position Interest rate — 62 2 64 Total derivative contracts in a receivable position — 62 2 64 Total assets $ 2,670 $ 28,282 $ 55 $ 31,007 Liabilities Accrued expenses and other liabilities Derivative contracts in a payable position Foreign currency $ — $ 5 $ — $ 5 Total derivative contracts in a payable position — 5 — 5 Total liabilities $ — $ 5 $ — $ 5 (a) Our investment in any one industry did not exceed 13% . (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, 2020 Net unrealized gains still held at June 30, 2020 ($ in millions) Fair value at April 1, 2020 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Investment securities Equity securities $ 4 $ 1 (a) $ — $ — $ — $ — $ — $ 5 $ 1 $ — Available-for-sale securities 3 — — 2 — — — 5 — — Mortgage loans held-for-sale (b) 68 8 (c) — 676 (661 ) — — 91 1 — Finance receivables and loans, net (b) 10 1 (d) — 3 — — (6 ) 8 — — Other assets Interests retained in financial asset sales 1 — — — — — — 1 — — Derivative assets 8 4 (c) — — — — — 12 4 — Total assets $ 94 $ 14 $ — $ 681 $ (661 ) $ — $ (6 ) $ 122 $ 6 $ — (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 . (d) Reported as interest and fees on finance receivables and loans and other income, net of losses 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 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 — — — — — — 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 Net realized/unrealized (losses) gains Fair value at June 30, 2020 Net unrealized (losses) gains still held at June 30, 2020 ($ in millions) Fair value at Jan. 1, 2020 included in earnings included in OCI Purchases Sales Issuances Settlements included in earnings included in OCI Assets Investment securities Equity securities $ 8 $ (3 ) (a) $ — $ — $ — $ — $ — $ 5 $ (3 ) $ — Available-for-sale securities 2 — — 3 — — — 5 — — Mortgage loans held-for-sale (b) 30 13 (c) — 978 (930 ) — — 91 2 — Finance receivables and loans, net (b) 11 — — 9 — — (12 ) 8 — — Other assets Interests retained in financial asset sales 2 — — — — — (1 ) 1 — — Derivative assets 2 10 (c) — — — — — 12 10 — Total assets $ 55 $ 20 $ — $ 990 $ (930 ) $ — $ (13 ) $ 122 $ 9 $ — (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 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 .
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, 2020 , and December 31, 2019 , respectively. The amounts are generally 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 adjustments Total gain (loss) included in earnings June 30, 2020 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 313 $ 313 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 53 53 (17 ) n/m (a) Other — — 44 44 (10 ) n/m (a) Total commercial finance receivables and loans, net — — 97 97 (27 ) n/m (a) Other assets Nonmarketable equity investments — — 5 5 (4 ) n/m (a) Goodwill (c) — — 143 143 (50 ) n/m (a) Repossessed and foreclosed assets (d) — — 8 8 — n/m (a) Total assets $ — $ — $ 566 $ 566 $ (81 ) 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 2020 . The related valuation allowance represents the cumulative adjustment to fair value of those specific receivables. (c) On April 30, 2020, we recognized a $50 million impairment of goodwill at Ally Invest. Refer to Note 11 for further discussion. (d) The allowance provided for repossessed and foreclosed assets represents any cumulative valuation adjustment recognized to adjust the assets to fair value. Nonrecurring fair value measurements Lower-of-cost or fair value reserve, valuation reserve, or cumulative adjustments Total gain (loss) included in earnings December 31, 2019 ($ in millions) Level 1 Level 2 Level 3 Total Assets Loans held-for-sale, net $ — $ — $ 128 $ 128 $ — n/m (a) Commercial finance receivables and loans, net (b) Automotive — — 64 64 (12 ) n/m (a) Other — — 45 45 (21 ) n/m (a) Total commercial finance receivables and loans, net — — 109 109 (33 ) n/m (a) Other assets Nonmarketable equity investments — 5 7 12 — n/m (a) Equity-method investments — — 4 4 (6 ) n/m (a) Repossessed and foreclosed assets (c) — — 12 12 (1 ) n/m (a) Total assets $ — $ 5 $ 260 $ 265 $ (40 ) 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.
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, 2020 , and December 31, 2019 . Estimated fair value ($ in millions) Carrying value Level 1 Level 2 Level 3 Total June 30, 2020 Financial assets Held-to-maturity securities $ 1,390 $ — $ 1,476 $ — $ 1,476 Loans held-for-sale, net 313 — — 313 313 Finance receivables and loans, net 114,872 — — 120,845 120,845 FHLB/FRB stock (a) 1,000 — 1,000 — 1,000 Financial liabilities Deposit liabilities $ 60,340 $ — $ — $ 61,429 $ 61,429 Short-term borrowings 3,689 — — 3,692 3,692 Long-term debt 29,176 — 19,462 12,223 31,685 December 31, 2019 Financial assets Held-to-maturity securities $ 1,568 $ — $ 1,600 $ — $ 1,600 Loans held-for-sale, net 128 — — 128 128 Finance receivables and loans, net 126,957 — — 130,837 130,837 FHLB/FRB stock (a) 1,150 — 1,150 — 1,150 Financial liabilities Deposit liabilities $ 60,146 $ — $ — $ 60,678 $ 60,678 Short-term borrowings 5,531 — — 5,532 5,532 Long-term debt 34,027 — 22,789 14,138 36,927 (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, 2020
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 ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount June 30, 2020 Assets Derivative assets in net asset positions $ 2 $ — $ 2 $ (2 ) $ — $ — Derivative assets with no offsetting arrangements 12 — 12 — — 12 Total assets $ 14 $ — $ 14 $ (2 ) $ — $ 12 Liabilities Derivative liabilities in net asset positions $ 2 $ — $ 2 $ (2 ) $ — $ — Securities sold under agreements to repurchase (d) 79 — 79 — (79 ) — Total liabilities $ 81 $ — $ 81 $ (2 ) $ (79 ) $ — December 31, 2019 Assets Derivative assets in net asset positions $ 62 $ — $ 62 $ — $ (36 ) $ 26 Derivative assets with no offsetting arrangements 2 — 2 — — 2 Total assets $ 64 $ — $ 64 $ — $ (36 ) $ 28 Liabilities Derivative liabilities in net liability positions $ 5 $ — $ 5 $ — $ (4 ) $ 1 Total liabilities $ 5 $ — $ 5 $ — $ (4 ) $ 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 $29 million of noncash derivative collateral pledged to us that was excluded at December 31, 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 $29 million at December 31, 2019 . We have not sold or pledged any of the noncash collateral received under these agreements. (d) For additional information on securities sold under agreements to repurchase, refer to Note 13 .
Offsetting Liabilities	The composition of offsetting derivative instruments, financial assets, and financial liabilities was as follows. Gross amounts of recognized assets/liabilities Gross amounts offset on the Condensed Consolidated Balance Sheet Net amounts of assets/liabilities presented on the Condensed Consolidated Balance Sheet Gross amounts not offset on the Condensed Consolidated Balance Sheet ($ in millions) Financial instruments Collateral (a) (b) (c) Net amount June 30, 2020 Assets Derivative assets in net asset positions $ 2 $ — $ 2 $ (2 ) $ — $ — Derivative assets with no offsetting arrangements 12 — 12 — — 12 Total assets $ 14 $ — $ 14 $ (2 ) $ — $ 12 Liabilities Derivative liabilities in net asset positions $ 2 $ — $ 2 $ (2 ) $ — $ — Securities sold under agreements to repurchase (d) 79 — 79 — (79 ) — Total liabilities $ 81 $ — $ 81 $ (2 ) $ (79 ) $ — December 31, 2019 Assets Derivative assets in net asset positions $ 62 $ — $ 62 $ — $ (36 ) $ 26 Derivative assets with no offsetting arrangements 2 — 2 — — 2 Total assets $ 64 $ — $ 64 $ — $ (36 ) $ 28 Liabilities Derivative liabilities in net liability positions $ 5 $ — $ 5 $ — $ (4 ) $ 1 Total liabilities $ 5 $ — $ 5 $ — $ (4 ) $ 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 $29 million of noncash derivative collateral pledged to us that was excluded at December 31, 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 $29 million at December 31, 2019 . We have not sold or pledged any of the noncash collateral received under these agreements. (d) For additional information on securities sold under agreements to repurchase, refer to Note 13 .

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2020
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) 2020 Net financing revenue and other interest income $ 989 $ 12 $ 30 $ 77 $ (54 ) $ 1,054 Other revenue 40 438 19 6 52 555 Total net revenue 1,029 450 49 83 (2 ) 1,609 Provision for credit losses 256 — 3 25 3 287 Total noninterest expense 444 322 38 26 155 985 Income (loss) from continuing operations before income tax expense $ 329 $ 128 $ 8 $ 32 $ (160 ) $ 337 Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 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 credit 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 (a) Net financing revenue and other interest income after the provision for credit losses totaled $767 million and $980 million for the three months ended June 30, 2020 , and June 30, 2019 , respectively. Six months ended June 30, ($ in millions) Automotive Finance operations Insurance operations Mortgage Finance operations Corporate Finance operations Corporate and Other Consolidated (a) 2020 Net financing revenue and other interest income $ 2,029 $ 26 $ 68 $ 145 $ (68 ) $ 2,200 Other revenue 87 575 29 19 111 821 Total net revenue 2,116 601 97 164 43 3,021 Provision for credit losses 1,022 — 4 139 25 1,190 Total noninterest expense 938 578 73 61 255 1,905 Income (loss) from continuing operations before income tax expense $ 156 $ 23 $ 20 $ (36 ) $ (237 ) $ (74 ) Total assets $ 102,016 $ 8,740 $ 16,669 $ 6,206 $ 50,430 $ 184,061 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 credit 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 (a) Net financing revenue and other interest income after the provision for credit losses totaled $1.0 billion and $1.8 billion for the six months ended June 30, 2020 , and June 30, 2019 , respectively.

Description of Business, Basi_3

Description of Business, Basis of Presentation, and Changes in Significant Accounting Policies (Details) - USD ($) $ in Millions	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ (13,399)	$ (13,826)	$ (14,316)	$ (13,826)	$ (14,316)	$ (13,519)	$ (14,416)	$ (13,699)	$ (13,266)	$ (13,268)
Allowance for Loan and Lease Losses, Adjustments, Other		$ 0	(1)	$ (1)	0
Phase-in of capital impact of Accounting Standards Update 2016-13		25.00%		25.00%
CECL scaling factor		25.00%		25.00%
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	1,017
Allowance for Loan and Lease Losses, Adjustments, Other	1,300
Phase-in of capital impact of Accounting Standards Update 2016-13		25.00%		25.00%
CECL scaling factor		25.00%		25.00%
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	5,074	$ 5,296	$ 4,682	$ 5,296	$ 4,682	$ 5,465	$ 4,057	$ 5,195	$ 5,499	$ 5,489
Accumulated Deficit | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ 1,017

Acquistions (Details)

Acquistions (Details) $ in Millions	3 Months Ended
	Dec. 31, 2019USD ($)
Business Combinations [Abstract]
Cash consideration	$ 177

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 179	$ 183	$ 365	$ 362
Other revenue	555	395	821	861
Remarketing losses (gains), net	11	(23)	9	(38)
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15	21	32	43
Other revenue	52	34	111	59
Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18	24	40	47
Other revenue	40	61	87	129
Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	146	138	293	272
Other revenue	438	286	575	646
Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other revenue	19	4	29	6
Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other revenue	6	10	19	21
Noninsurance contracts
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	142	134	285	265
Unearned revenue, remaining performance obligation, amount	2,900	2,800	2,900	2,800	$ 2,900	$ 2,900	$ 2,700	$ 2,600
Unearned revenue, revenue recognized	211	202	425	401
Capitalized contract cost, net	1,800	1,600	1,800	1,600	$ 1,700	$ 1,700	$ 1,600	$ 1,500
Capitalized contract cost, amortization	121	114	246	225
Noninsurance contracts | 2020
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	406		406
Noninsurance contracts | 2021
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	747		747
Noninsurance contracts | 2022
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	649		649
Noninsurance contracts | 2023
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	520		520
Noninsurance contracts | 2024 and thereafter
Disaggregation of Revenue [Line Items]
Unearned revenue, remaining performance obligation, amount	596		596
Noninsurance contracts | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Noninsurance contracts | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Noninsurance contracts | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	142	134	285	265
Noninsurance contracts | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Noninsurance contracts | Corporate Finance operations | Operating Segments
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	15	19	32	37
Remarketing fee income | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15	19	32	37
Remarketing fee income | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Remarketing fee income | Corporate Finance operations | Operating Segments
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	14	17	27	34
Brokerage commissions and other revenue | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14	17	27	34
Brokerage commissions and other revenue | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokerage commissions and other revenue | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	4	8	7
Brokered/agent commissions | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4	4	8	7
Brokered/agent commissions | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Brokered/agent commissions | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposits and Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	4	5	9
Deposits and Banking | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	4	5	9
Deposits and Banking | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposits and Banking | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposits and Banking | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Deposits and Banking | Corporate Finance operations | Operating Segments
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	3	5	8	10
Other | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	5	8	10
Other | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Out of scope of Topic 606
Disaggregation of Revenue [Line Items]
Other revenue	376	212	456	499
Out of scope of Topic 606 | Corporate and Other
Disaggregation of Revenue [Line Items]
Other revenue	37	13	79	16
Out of scope of Topic 606 | Automotive Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Other revenue	22	37	47	82
Out of scope of Topic 606 | Insurance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Other revenue	292	148	282	374
Out of scope of Topic 606 | Mortgage Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Other revenue	19	4	29	6
Out of scope of Topic 606 | Corporate Finance operations | Operating Segments
Disaggregation of Revenue [Line Items]
Other revenue	$ 6	$ 10	$ 19	$ 21

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Nonoperating Income (Expense) [Abstract]
Income from equity-method investments	$ 53	$ 8	$ 52	$ 12
Late charges and other administrative fees	16	28	37	57
Remarketing fees	15	19	32	37
Servicing fees	2	4	5	10
Other, net	4	34	44	64
Total other income, net of losses	$ 90	$ 93	$ 170	$ 180

Reserves for Insurance Losses_3

Reserves for Insurance Losses and Loss Adjustment Expenses Reserves for Insurance Losses and Loss Adjustment Expenses (Rollforward of Reserves for Insurance Losses and Loss Adjustment Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for insurance losses and loss adjustment expenses			$ 122	$ 134
Reinsurance recoverable			88	96
Net reserves for insurance losses and loss adjustment expenses			34	38
Net insurance losses and loss adjustment expenses, current year			215	186
Net insurance losses and loss adjustment expenses, prior years			1	0
Net insurance losses and loss adjustment expenses incurred	$ 142	$ 127	216	186
Net insurance losses and loss adjustment expenses paid or payable, current year			(178)	(134)
Net insurance losses and loss adjustment expenses paid or payable, prior years			(26)	(27)
Total net insurance losses and loss adjustment expenses paid or payable			(204)	(161)
Net reserves for insurance losses and loss adjustment expenses	46	63	46	63
Reinsurance recoverable	86	90	86	90
Gross reserves for insurance losses and loss adjustment expenses	$ 132	$ 153	$ 132	$ 153

Other Operating Expenses (Sched

Other Operating Expenses (Schedule Of Other Operating Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Expenses [Abstract]
Insurance commissions	$ 127	$ 117	$ 253	$ 231
Technology and communications	80	73	159	150
Lease and loan administration	46	43	84	82
Advertising and marketing	32	35	76	83
Property and equipment depreciation	34	25	68	47
Professional services	28	30	59	59
Regulatory and licensing fees	29	28	58	56
Vehicle remarketing and repossession	11	25	34	52
Occupancy	13	16	29	29
Non-income taxes	7	11	14	20
Amortization of intangible assets	5	3	10	6
Other	47	52	101	96
Total other operating expenses	$ 459	$ 458	$ 945	$ 911

Investment Securities (Investme

Investment Securities (Investment Table) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Debt securities, available-for-sale, fair value	$ 29,225	$ 30,284
Debt securities, held-to-maturity, amortized cost	1,390	1,568
Held-to-maturity securities, fair value	1,476	1,600
Available-for-sale securities
Schedule of Investments [Line Items]
Securities pledged for Federal Home Loan Bank, at fair value	215	1,900
Securities, amount eligible to be repledged or sold by counterparty	215	118
Operating Segments | Insurance operations | Available-for-sale securities
Schedule of Investments [Line Items]
Deposit securities	13	12
US Treasury | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	784	2,059
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	23	6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	0	(17)
Debt securities, available-for-sale, fair value	807	2,048
US States and political subdivisions | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	876	623
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	38	19
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	(1)	(1)
Debt securities, available-for-sale, fair value	913	641
Foreign government | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	153	184
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	9	3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	0	(1)
Debt securities, available-for-sale, fair value	162	186
Agency mortgage-backed residential
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	1,376
Agency mortgage-backed residential | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	19,136	21,183
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	752	257
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	(4)	(36)
Debt securities, available-for-sale, fair value	19,884	21,404
Agency mortgage-backed residential | Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	1,376	1,547
Debt securities, held-to-maturity, unrecognized gain	86	38
Debt securities, held-to-maturity, unrecognized loss	0	(6)
Held-to-maturity securities, fair value	1,462	1,579
Mortgage-backed residential | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	3,387	2,841
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	42	20
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	(4)	(11)
Debt securities, available-for-sale, fair value	3,425	2,850
Agency mortgage-backed commercial | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	1,647	1,344
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	139	44
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	0	(6)
Debt securities, available-for-sale, fair value	1,786	1,382
Mortgage-backed commercial | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	41	41
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	0	1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	(3)	0
Debt securities, available-for-sale, fair value	38	42
Asset-backed
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	14
Asset-backed | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	352	365
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	4	3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	0	0
Debt securities, available-for-sale, fair value	356	368
Asset-backed | Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	14	21
Debt securities, held-to-maturity, unrecognized gain	0	0
Debt securities, held-to-maturity, unrecognized loss	0	0
Held-to-maturity securities, fair value	14	21
Corporate debt | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	1,761	1,327
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	97	37
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	(4)	(1)
Debt securities, available-for-sale, fair value	1,854	1,363
Available-for-sale debt securities | Available-for-sale securities
Schedule of Investments [Line Items]
Debt securities, available-for-sale, amortized cost	28,137	29,967
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax	1,104	390
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax	(16)	(73)
Debt securities, available-for-sale, fair value	29,225	30,284
Accrued interest receivable	90	98
Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost	1,390	1,568
Debt securities, held-to-maturity, unrecognized gain	86	38
Debt securities, held-to-maturity, unrecognized loss	0	(6)
Held-to-maturity securities, fair value	1,476	1,600
Accrued interest receivable	3	3
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	$ 0	$ 915

Investment Securities (Invest_2

Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 29,225	$ 30,284
Cash equivalents	3,200	73
Held-to-maturity securities
Schedule of Investments [Line Items]
Debt securities, held-to-maturity, amortized cost, before other-than-temporary impairment	$ 1,390	$ 1,568
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	$ 14	$ 21
Debt securities, held-to-maturity, due after one year through five years, yield	2.40%	2.20%
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	$ 1,376	$ 1,547
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	$ 807	$ 2,048
Debt securities, available-for-sale, yield	1.20%	1.50%
Debt securities, available-for-sale, due in one year or less	$ 14	$ 65
Debt securities, available-for-sale, due in one year or less, yield	0.30%	2.10%
Debt securities, available-for-sale, due after one year through five years	$ 709	$ 1,590
Debt securities, available-for-sale, due after one year through five years, yield	1.10%	1.40%
Debt securities, available-for-sale, due after five years through ten years	$ 84	$ 393
Debt securities, available-for-sale, due after five years through ten years, yield	1.70%	1.70%
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	$ 784	$ 2,059
Available-for-sale securities | US States and political subdivisions
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 913	$ 641
Debt securities, available-for-sale, yield	3.20%	3.10%
Debt securities, available-for-sale, due in one year or less	$ 20	$ 22
Debt securities, available-for-sale, due in one year or less, yield	2.50%	2.70%
Debt securities, available-for-sale, due after one year through five years	$ 88	$ 75
Debt securities, available-for-sale, due after one year through five years, yield	2.40%	2.30%
Debt securities, available-for-sale, due after five years through ten years	$ 176	$ 159
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	$ 629	$ 385
Debt securities, available-for-sale, due after ten years, yield	3.40%	3.40%
Debt securities, available-for-sale, amortized cost	$ 876	$ 623
Available-for-sale securities | Foreign government
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 162	$ 186
Debt securities, available-for-sale, yield	2.10%	1.90%
Debt securities, available-for-sale, due in one year or less	$ 8	$ 35
Debt securities, available-for-sale, due in one year or less, yield	1.70%	0.40%
Debt securities, available-for-sale, due after one year through five years	$ 79	$ 65
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	$ 75	$ 86
Debt securities, available-for-sale, due after five years through ten years, yield	2.00%	2.30%
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	$ 153	$ 184
Available-for-sale securities | Agency mortgage-backed residential
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 19,884	$ 21,404
Debt securities, available-for-sale, yield	3.20%	3.20%
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	$ 44	$ 47
Debt securities, available-for-sale, due after five years through ten years, yield	2.00%	2.00%
Debt securities, available-for-sale, due after ten years	$ 19,840	$ 21,357
Debt securities, available-for-sale, due after ten years, yield	3.20%	3.20%
Debt securities, available-for-sale, amortized cost	$ 19,136	$ 21,183
Available-for-sale securities | Mortgage-backed residential
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 3,425	$ 2,850
Debt securities, available-for-sale, yield	3.20%	3.20%
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	$ 3,425	$ 2,850
Debt securities, available-for-sale, due after ten years, yield	3.20%	3.20%
Debt securities, available-for-sale, amortized cost	$ 3,387	$ 2,841
Available-for-sale securities | Agency mortgage-backed commercial
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 1,786	$ 1,382
Debt securities, available-for-sale, yield	2.50%	2.90%
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	3.30%	3.20%
Debt securities, available-for-sale, due after five years through ten years	$ 1,247	$ 1,109
Debt securities, available-for-sale, due after five years through ten years, yield	2.60%	3.00%
Debt securities, available-for-sale, due after ten years	$ 536	$ 270
Debt securities, available-for-sale, due after ten years, yield	2.20%	2.40%
Debt securities, available-for-sale, amortized cost	$ 1,647	$ 1,344
Available-for-sale securities | Mortgage-backed commercial
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 38	$ 42
Debt securities, available-for-sale, yield	3.60%	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	$ 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	$ 38	$ 42
Debt securities, available-for-sale, due after ten years, yield	3.60%	3.50%
Debt securities, available-for-sale, amortized cost	$ 41	$ 41
Available-for-sale securities | Asset-backed
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 356	$ 368
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	$ 294	$ 317
Debt securities, available-for-sale, due after one year through five years, yield	3.50%	3.60%
Debt securities, available-for-sale, due after five years through ten years	$ 28	$ 5
Debt securities, available-for-sale, due after five years through ten years, yield	2.60%	2.70%
Debt securities, available-for-sale, due after ten years	$ 34	$ 46
Debt securities, available-for-sale, due after ten years, yield	3.10%	3.00%
Debt securities, available-for-sale, amortized cost	$ 352	$ 365
Available-for-sale securities | Corporate debt
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 1,854	$ 1,363
Debt securities, available-for-sale, yield	3.00%	3.20%
Debt securities, available-for-sale, due in one year or less	$ 153	$ 125
Debt securities, available-for-sale, due in one year or less, yield	2.90%	2.90%
Debt securities, available-for-sale, due after one year through five years	$ 705	$ 580
Debt securities, available-for-sale, due after one year through five years, yield	2.90%	3.00%
Debt securities, available-for-sale, due after five years through ten years	$ 973	$ 649
Debt securities, available-for-sale, due after five years through ten years, yield	3.10%	3.40%
Debt securities, available-for-sale, due after ten years	$ 23	$ 9
Debt securities, available-for-sale, due after ten years, yield	2.40%	3.30%
Debt securities, available-for-sale, amortized cost	$ 1,761	$ 1,327
Available-for-sale securities | Available-for-sale debt securities
Schedule of Investments [Line Items]
Total available-for-sale debt securities	$ 29,225	$ 30,284
Debt securities, available-for-sale, yield	3.10%	3.10%
Debt securities, available-for-sale, due in one year or less	$ 195	$ 247
Debt securities, available-for-sale, due in one year or less, yield	2.60%	2.30%
Debt securities, available-for-sale, due after one year through five years	$ 1,878	$ 2,630
Debt securities, available-for-sale, due after one year through five years, yield	2.30%	2.10%
Debt securities, available-for-sale, due after five years through ten years	$ 2,627	$ 2,448
Debt securities, available-for-sale, due after five years through ten years, yield	2.80%	2.80%
Debt securities, available-for-sale, due after ten years	$ 24,525	$ 24,959
Debt securities, available-for-sale, due after ten years, yield	3.20%	3.20%
Debt securities, available-for-sale, amortized cost	$ 28,137	$ 29,967
Debt securities, available-for-sale, maturity, within one year, amortized cost	193	246
Debt securities, available-for-sale, maturity, after one through five years, amortized cost	1,821	2,624
Debt securities, available-for-sale, maturity, after five through ten years, amortized cost	2,431	2,378
Debt securities, available-for-sale, maturity, after ten years, amortized cost	23,692	24,719
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	$ 1,376	$ 1,547
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	$ 1,376	$ 1,547
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	$ 14	$ 21
Debt securities, held-to-maturity, yield	2.40%	2.20%
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	$ 14	$ 21
Debt securities, held-to-maturity, due after one year through five years, yield	2.40%	2.20%
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	$ 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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Taxable interest	$ 177	$ 220	$ 382	$ 434
Taxable dividends	5	3	10	6
Interest and dividends exempt from U.S. federal income tax	5	4	8	9
Interest and dividends on investment securities and other earning assets	197	244	423	484
Excludes other earning assets
Interest and dividends on investment securities and other earning assets	$ 187	$ 227	$ 400	$ 449

Investment Securities (Schedule

Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, gross realized gains	$ 19	$ 24	$ 124	$ 34
Available-for-sale securities, gross realized losses	0	0	0	(1)
Net realized gains on available-for-sale securities	19	24	124	33
Net realized gain on equity securities	80	10	81	39
Net unrealized gain (loss) on equity securities	89	5	(96)	75
Other gain on investments, net	$ 188	$ 39	$ 109	$ 147

Investment securities (Invest_4

Investment securities (Investments Classified by Credit Rating) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 1,390	$ 1,568
Agency mortgage-backed residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,376
Asset-backed
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	14
AAA Rating
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	14
AAA Rating | Agency mortgage-backed residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	0
AAA Rating | Asset-backed
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	14
AA Rating
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,376
AA Rating | Agency mortgage-backed residential
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,376
AA Rating | Asset-backed
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity securities	$ 0

Investment Securities (Schedu_2

Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Securities [Line Items]
Debt Securities, held-to-maturity, less than 12 Months, fair value		$ 283
Debt securities, held-to-maturity, unrealized loss, less than 12 Months		(6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value		3
Debt securities, held-to-maturity, unrealized loss, 12 months or longer		0
Debt securities, available-for-sale, fair value, less than 12 months	$ 972	7,012
Debt securities, available-for-sale, unrealized loss, less than 12 months	(14)	(46)
Debt securities, available-for-sale, fair value, 12 months or longer	25	1,450
Debt securities, available-for-sale, unrealized loss, 12 months or longer	(2)	(27)
US Treasury
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	9	1,267
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(11)
Debt securities, available-for-sale, fair value, 12 months or longer	0	279
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(6)
US States and political subdivisions
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	55	72
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(1)
Debt securities, available-for-sale, fair value, 12 months or longer	5	5
Debt securities, available-for-sale, unrealized loss, 12 months or longer	(1)	0
Foreign government
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	2	40
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(1)
Debt securities, available-for-sale, fair value, 12 months or longer	0	3
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Agency mortgage-backed residential
Debt Securities [Line Items]
Debt Securities, held-to-maturity, less than 12 Months, fair value		283
Debt securities, held-to-maturity, unrealized loss, less than 12 Months		(6)
Debt Securities, held-to-maturity, 12 Months or Longer, fair value		0
Debt securities, held-to-maturity, unrealized loss, 12 months or longer		0
Debt securities, available-for-sale, fair value, less than 12 months	404	4,606
Debt securities, available-for-sale, unrealized loss, less than 12 months	(4)	(23)
Debt securities, available-for-sale, fair value, 12 months or longer	5	908
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(13)
Mortgage-backed residential
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	350	613
Debt securities, available-for-sale, unrealized loss, less than 12 months	(4)	(4)
Debt securities, available-for-sale, fair value, 12 months or longer	0	203
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	(7)
Agency mortgage-backed commercial
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	0	335
Debt securities, available-for-sale, unrealized loss, less than 12 months	0	(6)
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 [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	34	0
Debt securities, available-for-sale, unrealized loss, less than 12 months	(3)	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
Asset-backed
Debt Securities [Line Items]
Debt Securities, held-to-maturity, less than 12 Months, fair value		0
Debt securities, held-to-maturity, unrealized loss, less than 12 Months		0
Debt Securities, held-to-maturity, 12 Months or Longer, fair value		3
Debt securities, held-to-maturity, unrealized loss, 12 months or longer		0
Debt securities, available-for-sale, fair value, less than 12 months	38	8
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	11
Debt securities, available-for-sale, unrealized loss, 12 months or longer	0	0
Corporate debt
Debt Securities [Line Items]
Debt securities, available-for-sale, fair value, less than 12 months	80	71
Debt securities, available-for-sale, unrealized loss, less than 12 months	(3)	0
Debt securities, available-for-sale, fair value, 12 months or longer	14	41
Debt securities, available-for-sale, unrealized loss, 12 months or longer	$ (1)	$ (1)

Finance Receivables and Loans_3

Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 118,234	$ 128,231	$ 129,210
Unamortized premiums and discounts and deferred fees and costs	2,000
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	90,365	89,924
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	72,712	72,390	72,898
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	17,413	17,322	17,800
Consumer portfolio segment | Mortgage Finance operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	16,429	16,181
Interest-only mortgage loans	$ 8	11
Interest only mortgage percentage beginning principal amortization next year	33.00%
Consumer portfolio segment | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 984	1,141
Interest-only mortgage loans	$ 171	212
Interest-only mortgage loans having exited the interest-only period	99.00%
Consumer portfolio segment | Other loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	$ 240	212
Loans receivable, fair value	8	11
Commercial portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	27,869	38,307	$ 38,512
Commercial portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	17,755	28,332
Commercial portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	4,799	4,961
Commercial portfolio segment | Other loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables and loans, net	5,315	5,014
Finance receivables and loans, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	$ 995	$ 488

Finance Receivables and Loans_4

Finance Receivables and Loans, Net (Allowance for Credit Losses on Financing Receivables) (Details) - USD ($) $ in Millions	Jan. 01, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment				$ 111		$ 111
Financing receivable, allowance for credit losses, collectively evaluated for impairment				1,171		1,171
Loans and leases receivable, gross		$ 118,234		129,210	$ 118,234	129,210	$ 128,231
Financing receivable, individually evaluated for impairment				912		912
Financing receivable, collectively evaluated for impairment				128,298		128,298
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	$ (1,263)	(3,245)	$ (1,263)	(1,288)	(1,263)	(1,242)
Allowance for loan and lease losses, charge-offs		(291)		(318)	(675)	(678)
Allowance for loan and lease losses, recoveries		113		136	231	259
Allowance for loan and lease losses, net charge-offs		(178)		(182)	(444)	(419)
Provision for loan losses		287		177	1,190	459
Allowance for Loan and Lease Losses, Adjustments, Other		0		(1)	(1)	0
Allowance for loan losses	(2,609)	(3,354)	(3,245)	(1,282)	(3,354)	(1,282)
Provision for credit losses		287		177	1,190	459
Additional provision expense due to COVID 19
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit losses		128	602
Consumer portfolio segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and leases receivable, gross		90,365			90,365		89,924
Consumer portfolio segment | Automotive loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment				42		42
Financing receivable, allowance for credit losses, collectively evaluated for impairment				1,036		1,036
Loans and leases receivable, gross		72,712		72,898	72,712	72,898	72,390
Financing receivable, individually evaluated for impairment				496		496
Financing receivable, collectively evaluated for impairment				72,402		72,402
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(1,075)	(2,833)	(1,075)	(1,070)	(1,075)	(1,048)
Allowance for loan and lease losses, charge-offs		(245)		(301)	(618)	(653)
Allowance for loan and lease losses, recoveries		108		129	219	247
Allowance for loan and lease losses, net charge-offs		(137)		(172)	(399)	(406)
Provision for loan losses		269		180	954	437
Allowance for Loan and Lease Losses, Adjustments, Other		(2)		0	(1)	(1)
Allowance for loan losses	(2,409)	(2,963)	(2,833)	(1,078)	(2,963)	(1,078)
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment				20		20
Financing receivable, allowance for credit losses, collectively evaluated for impairment				29		29
Loans and leases receivable, gross		17,413		17,800	17,413	17,800	17,322
Financing receivable, individually evaluated for impairment				220		220
Financing receivable, collectively evaluated for impairment				17,580		17,580
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(46)	(39)	(46)	(52)	(46)	(53)
Allowance for loan and lease losses, charge-offs		(2)		(5)	(5)	(8)
Allowance for loan and lease losses, recoveries		4		7	9	12
Allowance for loan and lease losses, net charge-offs		2		2	4	4
Provision for loan losses		1		(5)	(2)	(8)
Allowance for Loan and Lease Losses, Adjustments, Other		0		0	0	0
Allowance for loan losses	(40)	(42)	(39)	(49)	(42)	(49)
Consumer portfolio segment | Other
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(9)	(45)	(9)		(9)
Allowance for loan and lease losses, charge-offs		(4)			(9)
Allowance for loan and lease losses, recoveries		0			1
Allowance for loan and lease losses, net charge-offs		(4)			(8)
Provision for loan losses		6			31
Allowance for Loan and Lease Losses, Adjustments, Other		2			1
Allowance for loan losses	(25)	(49)	(45)		(49)
Commercial portfolio segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment				49		49
Financing receivable, allowance for credit losses, collectively evaluated for impairment				106		106
Loans and leases receivable, gross		27,869		38,512	27,869	38,512	38,307
Financing receivable, individually evaluated for impairment				196		196
Financing receivable, collectively evaluated for impairment				38,316		38,316
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(133)	(328)	(133)	(166)	(133)	(141)
Allowance for loan and lease losses, charge-offs		(40)		(12)	(43)	(17)
Allowance for loan and lease losses, recoveries		1		0	2	0
Allowance for loan and lease losses, net charge-offs		(39)		(12)	(41)	(17)
Provision for loan losses		11		2	207	30
Allowance for Loan and Lease Losses, Adjustments, Other		0		(1)	(1)	1
Allowance for loan losses	(135)	(300)	$ (328)	$ (155)	(300)	$ (155)
Commercial portfolio segment | Automotive loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and leases receivable, gross		17,755			17,755		28,332
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and leases receivable, gross		$ 4,799			$ 4,799		$ 4,961
Accounting Standards Update 2016-13
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for Loan and Lease Losses, Adjustments, Other	1,300
Accounting Standards Update 2016-13 | Retained Earnings
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(1,346)
Accounting Standards Update 2016-13 | Retained Earnings | Consumer portfolio segment | Automotive loan
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(1,334)
Accounting Standards Update 2016-13 | Retained Earnings | Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	6
Accounting Standards Update 2016-13 | Retained Earnings | Consumer portfolio segment | Other
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	(16)
Accounting Standards Update 2016-13 | Retained Earnings | Commercial portfolio segment
Financing Receivable, Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses	$ (2)

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Sale	$ 0	$ 0	$ 0	$ 20
Financing receivable, sales and transfers				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]
Financing Receivable, Sale	$ 0	$ 0	$ 0	$ 20

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 2,506	$ 899	$ 3,350	$ 2,233
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	635	218	995	317
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	1,870	678	2,354	1,913
Commercial portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables and loans, significant purchases	$ 1	$ 3	$ 1	$ 3

Finance Receivables and Loans_7

Finance Receivables and Loans, Net (Schedule of Financing Receivables, Non Accrual Status) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	$ 1,532	$ 1,532	$ 1,396	$ 1,036
Financing Receivable, Nonaccrual, No Allowance	764	764
Financing Receivable, Nonaccrual, Interest Income	4	6
Consumer portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,314	1,314	1,140	821
Financing Receivable, Nonaccrual, No Allowance	667	667
Consumer portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1,250	1,250	1,077	762
Financing Receivable, Nonaccrual, No Allowance	633	633
Consumer portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	63	63	62	57
Financing Receivable, Nonaccrual, No Allowance	34	34
Consumer portfolio segment | Mortgage Finance operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	27	27	22	17
Financing Receivable, Nonaccrual, No Allowance	6	6
Consumer portfolio segment | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	36	36	40	40
Financing Receivable, Nonaccrual, No Allowance	28	28
Consumer portfolio segment | Other loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	1	1	1	2
Financing Receivable, Nonaccrual, No Allowance	0	0
Commercial portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	218	218	256	215
Financing Receivable, Nonaccrual, No Allowance	97	97
Commercial portfolio segment | Automotive loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	80	80	86	73
Financing Receivable, Nonaccrual, No Allowance	13	13
Commercial portfolio segment | Real estate-backed loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	6	6	8	4
Financing Receivable, Nonaccrual, No Allowance	6	6
Commercial portfolio segment | Other loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, recorded investment, nonaccrual status	132	132	$ 162	$ 138
Financing Receivable, Nonaccrual, No Allowance	$ 78	$ 78

Finance Receivables and Loans_8

Finance Receivables and Loans, Net (Impaired Loans) (Details) $ in Millions	Dec. 31, 2019USD ($)
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 1,013
Impaired Financing Receivable, Recorded Investment	961
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	261
Impaired Financing Receivable, with Related Allowance, Recorded Investment	700
Impaired Financing Receivable, Related Allowance	89
Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	766
Impaired Financing Receivable, Recorded Investment	746
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	183
Impaired Financing Receivable, with Related Allowance, Recorded Investment	563
Impaired Financing Receivable, Related Allowance	56
Consumer portfolio segment | Automotive loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	553
Impaired Financing Receivable, Recorded Investment	538
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	113
Impaired Financing Receivable, with Related Allowance, Recorded Investment	425
Impaired Financing Receivable, Related Allowance	38
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	213
Impaired Financing Receivable, Recorded Investment	208
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	70
Impaired Financing Receivable, with Related Allowance, Recorded Investment	138
Impaired Financing Receivable, Related Allowance	18
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	14
Impaired Financing Receivable, Recorded Investment	14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	6
Impaired Financing Receivable, with Related Allowance, Recorded Investment	8
Impaired Financing Receivable, Related Allowance	0
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	199
Impaired Financing Receivable, Recorded Investment	194
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	64
Impaired Financing Receivable, with Related Allowance, Recorded Investment	130
Impaired Financing Receivable, Related Allowance	18
Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	247
Impaired Financing Receivable, Recorded Investment	215
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	78
Impaired Financing Receivable, with Related Allowance, Recorded Investment	137
Impaired Financing Receivable, Related Allowance	33
Commercial portfolio segment | Automotive loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	73
Impaired Financing Receivable, Recorded Investment	73
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1
Impaired Financing Receivable, with Related Allowance, Recorded Investment	72
Impaired Financing Receivable, Related Allowance	12
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	4
Impaired Financing Receivable, Recorded Investment	4
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0
Impaired Financing Receivable, Related Allowance	0
Commercial portfolio segment | Other loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	170
Impaired Financing Receivable, Recorded Investment	138
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	73
Impaired Financing Receivable, with Related Allowance, Recorded Investment	65
Impaired Financing Receivable, Related Allowance	$ 21

Finance Receivables and Loans_9

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, 2019
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 948	$ 990
Impaired Financing Receivable, Interest Income, Accrual Method	11	23
Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	721	724
Impaired Financing Receivable, Interest Income, Accrual Method	11	22
Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	227	266
Impaired Financing Receivable, Interest Income, Accrual Method	0	1
Automotive loan | Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	498	498
Impaired Financing Receivable, Interest Income, Accrual Method	9	17
Automotive loan | Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	113	143
Impaired Financing Receivable, Interest Income, Accrual Method	0	1
Other loan | Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	108	117
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Real estate-backed loan | Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	223	226
Impaired Financing Receivable, Interest Income, Accrual Method	2	5
Real estate-backed loan | Commercial portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	6	6
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Mortgage Finance operations | Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	14	15
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Mortgage - Legacy | Consumer portfolio segment
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	209	211
Impaired Financing Receivable, Interest Income, Accrual Method	$ 2	$ 5

Finance Receivables and Loan_10

Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Consumer) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Jun. 30, 2019USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 118,234	$ 128,231	$ 129,210
Consumer portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	90,365	89,924
Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	16,208
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	27,289
Financing Receivable, Originated Two Years before Latest Fiscal Year	18,457
Financing Receivable, Originated Three Years before Latest Fiscal Year	13,042
Financing Receivable, Originated Four Years before Latest Fiscal Year	6,858
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	8,028
Financing Receivable, Revolving	351
Converted to term loans	124
Finance receivables and loans, net	90,357	89,913
Consumer portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	14,041
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	24,187
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,035
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,868
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,466
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,115
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	72,712	72,390	72,898
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	2,056
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,014
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,397
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,167
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,391
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,913
Financing Receivable, Revolving	351
Converted to term loans	124
Finance receivables and loans, net	17,413	17,322	$ 17,800
Consumer portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	240	212
Loans receivable, fair value	8	11
Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	111
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	88
Financing Receivable, Originated Two Years before Latest Fiscal Year	25
Financing Receivable, Originated Three Years before Latest Fiscal Year	7
Financing Receivable, Originated Four Years before Latest Fiscal Year	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	232	$ 201
Current period | Consumer portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	13,963
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	23,534
Financing Receivable, Originated Two Years before Latest Fiscal Year	15,405
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,404
Financing Receivable, Originated Four Years before Latest Fiscal Year	5,152
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,905
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	70,363
Current period | Consumer portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	109
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	86
Financing Receivable, Originated Two Years before Latest Fiscal Year	25
Financing Receivable, Originated Three Years before Latest Fiscal Year	7
Financing Receivable, Originated Four Years before Latest Fiscal Year	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	228
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	52
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	410
Financing Receivable, Originated Two Years before Latest Fiscal Year	374
Financing Receivable, Originated Three Years before Latest Fiscal Year	270
Financing Receivable, Originated Four Years before Latest Fiscal Year	176
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	114
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	1,396
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	1
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	17
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	122
Financing Receivable, Originated Two Years before Latest Fiscal Year	120
Financing Receivable, Originated Three Years before Latest Fiscal Year	87
Financing Receivable, Originated Four Years before Latest Fiscal Year	59
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	444
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	2
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	121
Financing Receivable, Originated Two Years before Latest Fiscal Year	136
Financing Receivable, Originated Three Years before Latest Fiscal Year	107
Financing Receivable, Originated Four Years before Latest Fiscal Year	79
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	57
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	509
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	$ 1
Operating Segments | Automotive Finance operations | Consumer portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Retail automotive and lease customers enrolled in program	1,300,000
Retail automotive customers enrolled in program	1,200,000
Percent of customers electing 120 day deferral	64.00%
Customers enrolled in loan program	840,000
Percent of customers enrolling in program	21.00%
Percent of customers electing deferral considered current at time of enrollment	97.00%
Customers who made at least one payment while enrolled in deferral program	16.00%
Operating Segments | Mortgage Finance operations | Consumer portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Customers enrolled in loan program	1,900
Percent of customers enrolling in program	5.00%
Percent of customers electing deferral considered current at time of enrollment	92.00%
Customers who made at least one payment while enrolled in deferral program	44.00%
Corporate and Other | Consumer portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Customers enrolled in loan program	6,300
Percent of customers enrolling in program	7.00%
Percent of customers electing deferral considered current at time of enrollment	84.00%
Customers who made at least one payment while enrolled in deferral program	20.00%

Finance Receivables and Loan_11

Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Consumer) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 118,234	$ 128,231	$ 129,210
Consumer portfolio segment
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	90,365	89,924
Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		3,286
Financing receivable, recorded investment, current		86,627
Total finance receivables and loans	90,357	89,913
Consumer portfolio segment | Automotive loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		3,142
Financing receivable, recorded investment, current		69,248
Total finance receivables and loans	72,712	72,390	72,898
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		137
Financing receivable, recorded investment, current		17,185
Total finance receivables and loans	17,413	17,322	$ 17,800
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		76
Financing receivable, recorded investment, current		16,105
Total finance receivables and loans	16,429	16,181
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		61
Financing receivable, recorded investment, current		1,080
Total finance receivables and loans	984	1,141
Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	240	212
Loans receivable, fair value	8	11
Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		7
Financing receivable, recorded investment, current		194
Total finance receivables and loans	232	201
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		2,269
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		2,185
Total finance receivables and loans	1,396
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		81
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		56
Total finance receivables and loans	83
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		25
Total finance receivables and loans	12
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	1
Financing receivables, 30 to 59 days past due | Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		3
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		611
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		590
Total finance receivables and loans	444
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		19
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		11
Total finance receivables and loans	12
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		8
Total finance receivables and loans	4
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	2
Financing receivables, 60 to 89 days past due | Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		2
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		406
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		367
Total finance receivables and loans	509
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		37
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
Total finance receivables and loans	10
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		28
Total finance receivables and loans	23
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Other loan
Financing Receivable, Past Due [Line Items]
Total finance receivables and loans	$ 1
Financing receivables, equal to greater than 90 days past due | Consumer portfolio segment | Other loan | Excludes fair value option elected other loans
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due		$ 2

Finance Receivables and Loan_12

Finance Receivables and Loans, Net (Financing Receivable Credit Quality Indicators Commercial) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 118,234	$ 128,231	$ 129,210
Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1,668
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,263
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,691
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,432
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,114
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,284
Financing Receivable, Revolving	18,293
Converted to term loans	124
Finance receivables and loans, net	27,869	38,307	$ 38,512
Pass | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net		34,080
Automotive loan | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	847
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	301
Financing Receivable, Originated Two Years before Latest Fiscal Year	162
Financing Receivable, Originated Three Years before Latest Fiscal Year	179
Financing Receivable, Originated Four Years before Latest Fiscal Year	105
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	92
Financing Receivable, Revolving	16,069
Converted to term loans	0
Finance receivables and loans, net	17,755	28,332
Automotive loan | Pass | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	785
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	281
Financing Receivable, Originated Two Years before Latest Fiscal Year	107
Financing Receivable, Originated Three Years before Latest Fiscal Year	112
Financing Receivable, Originated Four Years before Latest Fiscal Year	72
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	78
Financing Receivable, Revolving	13,802
Converted to term loans	0
Finance receivables and loans, net	15,237	25,235
Automotive loan | Special Mention | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	61
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18
Financing Receivable, Originated Two Years before Latest Fiscal Year	54
Financing Receivable, Originated Three Years before Latest Fiscal Year	65
Financing Receivable, Originated Four Years before Latest Fiscal Year	33
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14
Financing Receivable, Revolving	2,157
Converted to term loans	0
Finance receivables and loans, net	2,402
Automotive loan | Substandard | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	82
Converted to term loans	0
Finance receivables and loans, net	85
Automotive loan | Doubtful | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	2
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	28
Converted to term loans	0
Finance receivables and loans, net	31
Other loan | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	419
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	833
Financing Receivable, Originated Two Years before Latest Fiscal Year	594
Financing Receivable, Originated Three Years before Latest Fiscal Year	562
Financing Receivable, Originated Four Years before Latest Fiscal Year	211
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	350
Financing Receivable, Revolving	2,224
Converted to term loans	122
Finance receivables and loans, net	5,315	5,014
Other loan | Pass | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	419
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	631
Financing Receivable, Originated Two Years before Latest Fiscal Year	338
Financing Receivable, Originated Three Years before Latest Fiscal Year	299
Financing Receivable, Originated Four Years before Latest Fiscal Year	117
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	98
Financing Receivable, Revolving	1,912
Converted to term loans	73
Finance receivables and loans, net	3,887	4,225
Other loan | Special Mention | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	202
Financing Receivable, Originated Two Years before Latest Fiscal Year	256
Financing Receivable, Originated Three Years before Latest Fiscal Year	225
Financing Receivable, Originated Four Years before Latest Fiscal Year	94
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	119
Financing Receivable, Revolving	293
Converted to term loans	38
Finance receivables and loans, net	1,227
Other loan | Substandard | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	38
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	133
Financing Receivable, Revolving	19
Converted to term loans	11
Finance receivables and loans, net	201
Other loan | Doubtful | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	0
Real estate-backed loan | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	402
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,129
Financing Receivable, Originated Two Years before Latest Fiscal Year	935
Financing Receivable, Originated Three Years before Latest Fiscal Year	691
Financing Receivable, Originated Four Years before Latest Fiscal Year	798
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	842
Financing Receivable, Revolving	0
Converted to term loans	2
Finance receivables and loans, net	4,799	4,961
Real estate-backed loan | Pass | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	386
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,058
Financing Receivable, Originated Two Years before Latest Fiscal Year	873
Financing Receivable, Originated Three Years before Latest Fiscal Year	619
Financing Receivable, Originated Four Years before Latest Fiscal Year	712
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	803
Financing Receivable, Revolving	0
Converted to term loans	2
Finance receivables and loans, net	4,453	$ 4,620
Real estate-backed loan | Special Mention | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	16
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	71
Financing Receivable, Originated Two Years before Latest Fiscal Year	62
Financing Receivable, Originated Three Years before Latest Fiscal Year	69
Financing Receivable, Originated Four Years before Latest Fiscal Year	84
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	31
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	333
Real estate-backed loan | Substandard | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	3
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	10
Real estate-backed loan | Doubtful | Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1
Financing Receivable, Revolving	0
Converted to term loans	0
Finance receivables and loans, net	$ 3

Finance Receivables and Loan_13

Finance Receivables and Loans, Net (Schedule of Pass And Criticized Credit Quality Indicators of Finance Receivables) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 118,234	$ 128,231	$ 129,210
Commercial portfolio segment
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	27,869	38,307	$ 38,512
Commercial portfolio segment | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net		34,080
Commercial portfolio segment | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net		4,227
Commercial portfolio segment | Automotive loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	17,755	28,332
Commercial portfolio segment | Automotive loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	15,237	25,235
Commercial portfolio segment | Automotive loan | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net		3,097
Commercial portfolio segment | Other loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	5,315	5,014
Commercial portfolio segment | Other loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	3,887	4,225
Commercial portfolio segment | Other loan | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net		789
Commercial portfolio segment | Real estate-backed loan
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	4,799	4,961
Commercial portfolio segment | Real estate-backed loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net	$ 4,453	4,620
Commercial portfolio segment | Real estate-backed loan | Criticized
Financing Receivable, Credit Quality Indicator [Line Items]
Finance receivables and loans, net		$ 341

Finance Receivables and Loan_14

Finance Receivables and Loans, Net (Past Due Financing Receivables and Loans Commercial) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)	Jun. 30, 2019USD ($)
Financing Receivable, Past Due [Line Items]
Finance receivables and loans, net	$ 118,234	$ 128,231	$ 129,210
Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	55	83
Financing receivable, recorded investment, current	27,814	38,224
Finance receivables and loans, net	27,869	38,307	$ 38,512
Automotive loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	49	62
Financing receivable, recorded investment, current	17,706	28,270
Finance receivables and loans, net	17,755	28,332
Other loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	17
Financing receivable, recorded investment, current	5,315	4,997
Finance receivables and loans, net	5,315	5,014
Real estate-backed loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	6	4
Financing receivable, recorded investment, current	4,793	4,957
Finance receivables and loans, net	4,799	4,961
Financing receivables, 30 to 59 days past due | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	34
Financing receivables, 30 to 59 days past due | Automotive loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	34
Financing receivables, 30 to 59 days past due | Other loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Financing receivables, 30 to 59 days past due | Real estate-backed loan | Commercial portfolio segment
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
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1	0
Financing receivables, 60 to 89 days past due | Automotive loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	1	0
Financing receivables, 60 to 89 days past due | Other loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
Financing receivables, 60 to 89 days past due | Real estate-backed loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	0
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	54	49
Financing receivables, equal to greater than 90 days past due | Automotive loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	48	28
Financing receivables, equal to greater than 90 days past due | Other loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	0	17
Financing receivables, equal to greater than 90 days past due | Real estate-backed loan | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Financing receivable, recorded investment, past due	$ 6	$ 4
Operating Segments | Automotive Finance operations | Commercial portfolio segment
Financing Receivable, Past Due [Line Items]
Commercial automotive customers enrolling in program	2,290
Percent of customers enrolling in program	73.00%
Percentage of dealers who deferred wholesale interest and insurance payments	39.00%

Finance Receivables and Loan_15

Finance Receivables and Loans, Net (Troubled Debt Restructurings) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, gross carrying value	$ 1,300		$ 1,300		$ 867
Loans and leases receivable, impaired, commitment to lend	$ 16		$ 16		$ 17
Financing receivable, modifications, number of loans	21,338	5,619	44,181	13,073
Financing receivable, modifications, pre-modification gross carrying value	$ 391	$ 121	$ 746	$ 294
Financing receivable, modifications, post-modification gross carrying value	$ 344	$ 94	$ 677	$ 249
Consumer portfolio segment
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	21,335	5,618	44,177	13,066
Financing receivable, modifications, pre-modification gross carrying value	$ 337	$ 99	$ 685	$ 231
Financing receivable, modifications, post-modification gross carrying value	$ 311	$ 88	$ 637	$ 202
Consumer portfolio segment | Automotive loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	21,293	5,598	44,093	13,025
Financing receivable, modifications, pre-modification gross carrying value	$ 323	$ 96	$ 663	$ 225
Financing receivable, modifications, post-modification gross carrying value	$ 297	$ 85	$ 615	$ 196
Loans modified as a result of COVID-19	13,615		30,382
Pre and post modification amount of loans modified as a result of COVID-19	$ 191		$ 429
Consumer portfolio segment | Real estate-backed loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	42	20	84	41
Financing receivable, modifications, pre-modification gross carrying value	$ 14	$ 3	$ 22	$ 6
Financing receivable, modifications, post-modification gross carrying value	$ 14	$ 3	$ 22	$ 6
Consumer portfolio segment | Mortgage Finance operations
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	19	2	29	3
Financing receivable, modifications, pre-modification gross carrying value	$ 11	$ 0	$ 15	$ 0
Financing receivable, modifications, post-modification gross carrying value	$ 11	$ 0	$ 15	$ 0
Loans modified as a result of COVID-19	19		27
Pre and post modification amount of loans modified as a result of COVID-19	$ 11		$ 14
Consumer portfolio segment | Mortgage - Legacy
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	23	18	55	38
Financing receivable, modifications, pre-modification gross carrying value	$ 3	$ 3	$ 7	$ 6
Financing receivable, modifications, post-modification gross carrying value	$ 3	$ 3	$ 7	$ 6
Loans modified as a result of COVID-19	20		35
Pre and post modification amount of loans modified as a result of COVID-19	$ 2		$ 4
Commercial portfolio segment
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	3	1	4	7
Financing receivable, modifications, pre-modification gross carrying value	$ 54	$ 22	$ 61	$ 63
Financing receivable, modifications, post-modification gross carrying value	$ 33	$ 6	$ 40	$ 47
Commercial portfolio segment | Automotive loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	2	0	3	6
Financing receivable, modifications, pre-modification gross carrying value	$ 31	$ 0	$ 38	$ 41
Financing receivable, modifications, post-modification gross carrying value	$ 26	$ 0	$ 33	$ 41
Commercial portfolio segment | Other loan
Financing Receivable, Troubled Debt Restructuring
Financing receivable, modifications, number of loans	1	1	1	1
Financing receivable, modifications, pre-modification gross carrying value	$ 23	$ 22	$ 23	$ 22
Financing receivable, modifications, post-modification gross carrying value	$ 7	$ 6	$ 7	$ 6

Finance Receivables and Loan_16

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, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable
Financing receivable, modifications, subsequent default, number of loans	1,119	1,752	2,283	3,961
Financing receivable, modifications, subsequent default, gross carrying value	$ 11	$ 20	$ 24	$ 46
Financing receivables, impaired, troubled debt restructuring, charge-off amount	$ 8	$ 12	$ 17	$ 28
Automotive loan
Accounts, Notes, Loans and Financing Receivable
Financing receivable, modifications, subsequent default, number of loans	1,119	1,752	2,283	3,961
Financing receivable, modifications, subsequent default, gross carrying value	$ 11	$ 20	$ 24	$ 46
Financing receivables, impaired, troubled debt restructuring, charge-off amount	$ 8	$ 12	$ 17	$ 28

Leasing (Investments In Operati

Leasing (Investments In Operating Leases) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Lessee, operating lease, noncancellable lease term			367 days
Lessee, operating lease, lease extension, maximum			48 months
Operating lease, right-of-use assets	$ 137		$ 137		$ 168
Operating lease, liabilities	163		163		$ 196
Cash paid for amounts included in the measurement of lease liabilities	$ 12	$ 13	25	$ 25
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 43	$ 34
Operating lease, weighted-average remaining lease term	6 years	7 years	6 years	7 years
Operating lease, weighted average discount rate	2.64%	2.97%	2.64%	2.97%
Minimum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term			2 months
Lessee, operating lease, option to terminate			P2Y
Maximum
Lessee, Lease, Description [Line Items]
Operating lease remaining lease term			9 years
Lessee, operating lease, option to terminate			P6Y
Land and Building | Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Extend			P3Y
Land and Building | Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Extend			P15Y

Leasing (Lessee, Operating Leas

Leasing (Lessee, Operating Lease, Liability, Maturity) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Leases [Abstract]
2020	$ 25
2021	43
2022	30
2023	20
2024	13
2025 and thereafter	46
Total undiscounted cash flows	177
Difference between undiscounted cash flows and discounted cash flows	(14)
Operating lease, liabilities	163	$ 196
Purchases Of Operating Lease Assets	48
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 (Lease, Cost) (Details)

Leasing (Lease, Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 11	$ 12	$ 24	$ 23
Variable lease expense	2	2	4	4
Total lease expense, net	$ 13	$ 14	$ 28	$ 27

Leasing (Schedule of Property S

Leasing (Schedule of Property Subject to or Available for Operating Lease) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Lessor, Lease, Description [Line Items]
Lease customers enrolling in program	38,000
Percent of lease customers electing 120 day deferral	60.00%
Percent of lease customers enrolling in program	11.00%
Customers opted into an extension requiring additional payments	6,900
Residual value guarantee	15.00%
Vehicles available for operating lease, gross	$ 10,656	$ 10,426
Lessor Operating Lease Accumulated Depreciation	1,568	1,562
Investment in operating leases, net	$ 9,088	8,864
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
Lease customers enrolling in program	55,000
Vehicles
Lessor, Lease, Description [Line Items]
Operating Lease, Residual Value of Leased Asset	$ 411	$ 352

Leasing (Lessor, Operating Leas

Leasing (Lessor, Operating Lease, Payments to be Received, Maturity) (Details) $ in Millions	Jun. 30, 2020USD ($)
Leases [Abstract]
2020	$ 722
2021	1,114
2022	635
2023	228
2024	26
2025 and thereafter	1
Total lease payments from operating leases	$ 2,726

Leasing (Depreciation Expense o

Leasing (Depreciation Expense on Operating Lease Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases, Operating [Abstract]
Operating Lease, Lease Income	$ 343	$ 363	$ 710	$ 724
Depreciation expense on operating lease assets	241	262	491	523
Remarketing losses (gains), net	11	(23)	9	(38)
Net depreciation expense on operating lease assets	252	239	500	485
Variable lease payments, excessive wear and tear	$ 5	$ 5	$ 12	$ 9

Leasing (Sales-type and Direct

Leasing (Sales-type and Direct Financing Leases, Lease Receivable, Maturity) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Direct financing lease, net investment in lease	$ 455		$ 455		$ 472
Direct financing lease, present value of lease payments recorded as lease receivable	442		442		459
Direct financing lease, unguaranteed residual asset	13		13		$ 13
Direct financing lease, interest income	5	$ 6	11	$ 12
2020	75		75
2021	149		149
2022	112		112
2023	78		78
2024	46		46
2025 and thereafter	31		31
Total undiscounted cash flows	491		491
Direct financing leases, lease receivable, difference between undiscounted cash flows and discounted cash flows	$ (49)		$ (49)

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
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
Total assets	184,061	$ 180,448	184,061	$ 180,448	$ 180,644
Liabilities	170,235		170,235		166,228
Held-to-maturity securities	1,390		1,390		1,568
Other assets	6,721		6,721		6,073
On-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Total assets	16,622		16,622		19,344
Liabilities	6,499		6,499		9,098
Other assets	893		893		787
On-balance sheet variable interest entities | Consumer Automotive Industry Sector
Variable Interest Entity [Line Items]
Total assets	19,760		19,760		20,376
Liabilities	4,431		4,431		6,070
Assets Held-in-trust	9,400		9,400		9,000
Non-Recourse Debt	82		82		21
On-balance sheet variable interest entities | Commercial Automotive Industry Sector
Variable Interest Entity [Line Items]
Total assets	6,257		6,257		8,009
Liabilities	2,150		2,150		3,049
Off-balance sheet variable interest entities
Variable Interest Entity [Line Items]
Total assets	27,202		27,202		29,487
Liabilities	6,983		6,983		9,497
Assets sold to nonconsolidated VIEs	276		276		417
Variable interest entity, maximum loss exposure	1,768		1,768		1,837
Off-balance sheet variable interest entities | Consumer Automotive Industry Sector
Variable Interest Entity [Line Items]
Total assets	15		15		23
Liabilities	0		0		0
Assets sold to nonconsolidated VIEs	276		276		417
Variable interest entity, maximum loss exposure	290		290		440
Held-to-maturity securities	13		13		21
Other assets	2		2		2
Off-balance sheet variable interest entities | Commercial Other Industry Sector
Variable Interest Entity [Line Items]
Total assets	1,170		1,170		1,079
Liabilities	402		402		378
Assets sold to nonconsolidated VIEs	0		0		0
Variable interest entity, maximum loss exposure	$ 1,478		$ 1,478		1,397
Amount reconsolidated during the period
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entity					45
Amount reconsolidated during the period | Consumer Automotive Industry Sector
Variable Interest Entity [Line Items]
Assets of nonconsolidated variable interest entity					$ 48

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 - Consumer Automotive Industry Sector - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]
Cash flows received on retained interests in securitization entities	$ 8	$ 13
Cash flows between transferor and transferee, servicing fees	2	6
Cash flows between transferor and transferee, disbursement for repurchases during the period	$ (2)	$ (1)

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
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	$ 379		$ 379		$ 624
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period	6		6		8
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Net Credit Losses During Period	0	$ 3	1	$ 5
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	103		103		207
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period	1		1		2
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Net Credit Losses During Period	0	1	0	1
Off-balance sheet variable interest entities
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	276		276		417
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Delinquent Amount at End of Period	5		5		$ 6
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together, Net Credit Losses During Period	$ 0	$ 2	$ 1	$ 4

Other Assets (Schedule of Other

Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Other Assets [Abstract]
Property and equipment at cost	$ 1,433	$ 1,433	$ 1,332
Accumulated depreciation, property and equipment	(748)	(748)	(686)
Net property and equipment	685	685	646
Accrued interest, fees, and rent receivables	1,125	1,125	589
Nonmarketable equity investments	1,080	1,080	1,232
Investments in qualified affordable housing projects	930	930	830
Restricted cash held for securitization trusts	760	760	738
Equity-method investments	361	361	358
Goodwill	343	343	393
Net deferred tax assets	161	161	58
Other accounts receivable	150	150	117
Restricted cash and cash equivalents	73	73	87
Net intangible assets	60	60	69
Fair value of derivative contracts in receivable position	14	14	64
Other assets	979	979	892
Total other assets	6,721	6,721	6,073
Federal Home Loan Bank stock	551	551	701
Federal Reserve Bank stock	449	449	449
Equity securities without a readily determinable fair value	80	80	82
Equity securities without readily determinable fair value, impairment loss, amount	4	5
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	10	10
Impairment related to equity securities without a readily determinable fair value	11	11
Qualified Affordable Housing Project Investments, Commitment	397	397	372
Intangible Assets, Gross (Excluding Goodwill)	111	111	111
Intangible assets, accumulated amortization	$ 51	$ 51	$ 42

Other Assets (Schedule of Goodw

Other Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill [Roll Forward]
Goodwill			$ 393
Goodwill impairment	$ (50)	$ 0	(50)	$ 0
Goodwill	343		343
Operating Segments | Automotive Finance operations
Goodwill [Roll Forward]
Goodwill			20
Goodwill impairment			0
Goodwill	20		20
Operating Segments | Insurance operations
Goodwill [Roll Forward]
Goodwill			27
Goodwill impairment			0
Goodwill	27		27
Corporate and Other
Goodwill [Roll Forward]
Goodwill			346
Goodwill impairment			(50)
Goodwill	296		296
Ally Lending | Corporate and Other
Goodwill [Roll Forward]
Goodwill			153
Goodwill	153		153
Ally Invest | Corporate and Other
Goodwill [Roll Forward]
Goodwill			193
Goodwill	$ 143		$ 143

Deposit Liabilities (Schedule o

Deposit Liabilities (Schedule of Deposit Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
Noninterest-bearing deposits	$ 134	$ 119
Interest-bearing Deposit Liabilities, by Component [Abstract]
Interest-bearing deposits, savings and money-market checking accounts	72,561	62,486
Interest-bearing deposits, certificates of deposit	58,340	58,146
Interest-bearing deposits, other deposits	1	1
Total deposit liabilities	131,036	120,752
Certificates of deposit, $100,000 or more	27,000	25,600
Certificates of deposit, in excess of $250,000 federal insurance limits	$ 8,700	$ 8,200

Debt (Schedule of Short-term De

Debt (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Demand notes	$ 2,510	$ 2,581
Federal Home Loan Bank, advances	1,100	2,950
Securities sold under agreements to repurchase	79	0
Total short-term borrowings	3,689	5,531
Non-derivative Cash Collateral Placed with Counterparties Associated with the Repurchase Agreements	11	0
Non-derivative cash collateral received from counterparties associated with repurchase agreements	0
Non-derivative noncash collateral received from counterparties associated with repurchase agreements	0	0
Unsecured debt
Short-term Debt [Line Items]
Demand notes	2,510	2,581
Federal Home Loan Bank, advances	0	0
Securities sold under agreements to repurchase	0	0
Total short-term borrowings	2,510	2,581
Secured debt
Short-term Debt [Line Items]
Demand notes	0	0
Federal Home Loan Bank, advances	1,100	2,950
Securities sold under agreements to repurchase	79	0
Total short-term borrowings	1,179	$ 2,950
Secured debt | Mortgage-backed residential | Maturity Less than 30 Days
Short-term Debt [Line Items]
Financial instruments sold under agreements to repurchase	$ 79

Debt (Long-term Debt) (Details)

Debt (Long-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, due within one year	$ 8,705	$ 9,219
Long-term debt, due after one year	20,471	24,808
Total long-term debt	29,176	34,027
Trust preferred securities	2,600	2,600
Secured Debt	19,146	25,773
Unsecured debt
Debt Instrument [Line Items]
Long-term debt, due within one year	1,063	2,214
Long-term debt, due after one year	10,146	8,990
Total long-term debt	11,209	11,204
Secured debt
Debt Instrument [Line Items]
Long-term debt, due within one year	7,642	7,005
Long-term debt, due after one year	10,325	15,818
Total long-term debt	17,967	22,823
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Secured Debt	$ 11,500	$ 13,300

Debt (Scheduled Remaining Matur

Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	$ 3,020
Long-term debt, maturities, repayments of principal in year two	9,901
Long-term debt, maturities, repayments of principal in year three	6,501
Long-term debt, maturities, repayments of principal in year four	1,390
Long-term debt, maturities, repayments of principal in year five	1,508
Long-term debt, maturities, repayments of principal after year five	6,856
Total long-term debt	29,176	$ 34,027
Unsecured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	449
Long-term debt, maturities, repayments of principal in year two	648
Long-term debt, maturities, repayments of principal in year three	1,066
Long-term debt, maturities, repayments of principal in year four	802
Long-term debt, maturities, repayments of principal in year five	1,406
Long-term debt, maturities, repayments of principal after year five	6,838
Total long-term debt	11,209	11,204
Secured debt
Debt Instrument [Line Items]
Total long-term debt	17,967	$ 22,823
Long-term debt | Unsecured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	474
Long-term debt, maturities, repayments of principal in year two	701
Long-term debt, maturities, repayments of principal in year three	1,123
Long-term debt, maturities, repayments of principal in year four	865
Long-term debt, maturities, repayments of principal in year five	1,475
Long-term debt, maturities, repayments of principal after year five	7,663
Total long-term debt	12,301
Long-term debt | Secured debt
Debt Instrument [Line Items]
Long-term debt, maturities, repayments of principal in next 12 months	2,571
Long-term debt, maturities, repayments of principal in year two	9,253
Long-term debt, maturities, repayments of principal in year three	5,435
Long-term debt, maturities, repayments of principal in year four	588
Long-term debt, maturities, repayments of principal in year five	102
Long-term debt, maturities, repayments of principal after year five	18
Total long-term debt	17,967
Original issue discount | Unsecured debt
Debt Instrument [Line Items]
Debt instrument, unamortized discount, current	(25)
Debt instrument, unamortized discount	(1,092)
Original issue discount | Unsecured debt | Debt instrument, redemption, period two
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(53)
Original issue discount | Unsecured debt | Debt instrument, redemption, period three
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(57)
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(63)
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	(69)
Original issue discount | Unsecured debt | Debt instrument, redemption, period six
Debt Instrument [Line Items]
Debt instrument, unamortized discount, noncurrent	$ (825)

Debt (Pledged Assets Related to

Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Pledged Assets related to secured borrowings [Line Items]
Pledged financial instruments, investment securities	$ 72	$ 2,698
Pledged assets, mortgage assets held-for-investment and lending receivables	17,256	17,135
Pledged assets, restricted as collateral	40,590	46,204
Secured Debt	19,146	25,773
Short-term borrowings	3,689	5,531
Secured debt
Pledged Assets related to secured borrowings [Line Items]
Short-term borrowings	1,179	2,950
Consumer portfolio segment | Automotive loan
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	12,341	13,481
Commercial portfolio segment | Automotive loan
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	10,921	12,890
Ally Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged financial instruments, investment securities	72	2,698
Pledged assets, mortgage assets held-for-investment and lending receivables	17,256	17,135
Pledged assets, restricted as collateral	39,739	44,257
Secured Debt	18,410	24,069
Ally Bank | Pledged assets for Federal Home Loan Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, restricted as collateral	22,100	24,800
Ally Bank | Pledged assets for Federal Reserve Bank
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, restricted as collateral	2,400	2,400
Ally Bank | Consumer portfolio segment | Automotive loan
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	11,490	11,534
Ally Bank | Commercial portfolio segment | Automotive loan
Pledged Assets related to secured borrowings [Line Items]
Pledged assets, finance receivables	$ 10,921	$ 12,890

Debt (Narrative - Trust Preferr

Debt (Narrative - Trust Preferred Securities) (Details) - USD ($) $ / shares in Units, $ in Billions	Jun. 30, 2020	Dec. 31, 2019
Narrative - Trust Preferred Securities [Line Items]
Trust preferred securities	$ 2.6	$ 2.6
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%
Variable Income Interest Rate [Member]
Narrative - Trust Preferred Securities [Line Items]
Trust preferred securities	$ 2.6	$ 2.6
Trust Preferred Securities Subject to Mandatory Redemption
Narrative - Trust Preferred Securities [Line Items]
Series 2 TRUPS included in Tier 1 capital	$ 2.5

Debt (Committed Funding Facilit

Debt (Committed Funding Facilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,600
Revolving secured funding facilities 1 year or greater
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	550
Committed funding facilities | Secured debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,550	$ 2,500
Long-term line of credit	0	450
Line of credit facility, remaining borrowing capacity	1,550	2,050
Committed funding facilities | Ally Financial Inc | Secured debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		2,500
Long-term line of credit	0	450
Line of credit facility, remaining borrowing capacity	1,550	$ 2,050
Committed funding facilities | Ally Financial Inc | Revolving credit facility | Secured debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,550

Accrued Expenses and Other Li_3

Accrued Expenses and Other Liabilities (Schedule of Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 904	$ 535
Unfunded commitments for investment in qualified affordable housing projects	397	372
Employee compensation and benefits	229	296
Reserves for insurance losses and loss adjustment expenses	132	122	$ 153	$ 134
Deferred revenue	76	36
Net deferred tax liabilities	24	67
Cash collateral received from counterparties	12	48
Fair value of derivative contracts in payable position	2	5
Other liabilities	523	491
Total accrued expenses and other liabilities	$ 2,299	$ 1,972

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive (Loss) Income (Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Accumulated other comprehensive income (loss), investment securities, adjustment, after tax	$ 783	$ 133	$ 783	$ 133	$ 661	$ 208	$ (158)	$ (473)	$ (481)
Other comprehensive income (loss), investment securities, net change, after tax	122	291	575	606
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	19	18	18	18
Other comprehensive income (loss), foreign currency translation adjustment, net of tax	1	1	0	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	116	28	116	28	130	2	11	19	19
Other comprehensive income (loss), cash flow hedges, net change, after tax	(14)	17	114	9
Other Comprehensive Income (Loss), Defined Benefit Plan, Net of Tax [Abstract]
Accumulated other comprehensive income (loss), defined benefit pension plans, after tax	(103)	(96)	(103)	(96)	(103)	(106)	(96)	(95)	(95)
Other comprehensive (income) loss, defined benefit plan, after reclassification adjustment, after tax	0	0	3	(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Total accumulated other comprehensive loss, net of tax	(815)	(84)	(815)	(84)	$ (706)	$ (123)	$ 225	531	$ 539
Other comprehensive income, net of tax	$ 109	$ 309	$ 692	$ 615
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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
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	$ 175	$ 404	$ 877	$ 825
Other compehrensive income (loss), investement securities, net realized gains reclassified to income from continuing operations, before tax	19	24	124	33
Other comprehensive income, investment securities, net change, before tax	156	380	753	792
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	(38)	(95)	(206)	(194)
Other comprehensive income (loss), investment securities, net realized gains reclassified to income from continuing operations, tax effect	(4)	(6)	(28)	(8)
Other comprehensive income (loss), investment securities, net change, tax effect	(34)	(89)	(178)	(186)
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	137	309	671	631
Other comprehensive income (loss), investment securities, net realized gains reclassified to income from continuing operations, after tax	15	18	96	25
Other comprehensive income (loss), investment securities, net change, after tax	122	291	575	606
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Other comprehensive income (loss), translation adjustments, net change, before tax	6	4	(7)	6
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	5	3	(5)	4
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	(5)	(3)	7	(5)
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	(4)	(2)	5	(3)
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	169	21
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, before tax	19	4	19	9
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax		22	150	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)	(41)	(5)
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, tax	(5)	(1)	(5)	(2)
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, tax		(5)	(36)	(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	128	16
Other comprehensive income (loss), cash flow hedge, gain (loss), reclassification, after tax	14	3	14	7
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax		17	114	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			4	(1)
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			(1)	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	0	3	(1)
Other Comprehensive Income (Loss), before Tax [Abstract]
Other comprehensive income (loss), before tax	138	403	907	804
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss), tax effect	(29)	(94)	(215)	(189)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income, net of tax	$ 109	$ 309	$ 692	$ 615

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 242	$ 584	$ (77)	$ 959
Loss from discontinued operations, net of tax	(1)	(2)	(1)	(3)
Net income (loss)	$ 241	$ 582	$ (78)	$ 956
Basic weighted-average common shares outstanding	375,051	398,100	375,387	401,098
Diluted weighted-average common shares outstanding	375,762	399,916	375,387	402,921
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,300	0	2,400	0
Earnings Per Share, Basic [Abstract]
Net income (loss) from continuing operations, basic earnings per common share	$ 0.65	$ 1.47	$ (0.20)	$ 2.39
Loss from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	0	0	0	(0.01)
Net income (loss), basic earnings per common share	0.64	1.46	(0.21)	2.39
Earnings Per Share, Diluted [Abstract]
Net income (loss) from continuing operations, diluted earnings per common share	0.64	1.46	(0.20)	2.38
Loss from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0	0	0	(0.01)
Net income (loss), diluted earnings per common share	$ 0.64	$ 1.46	$ (0.21)	$ 2.37

Regulatory Capital and Other _3

Regulatory Capital and Other Regulatory Matters (Schedule of Regulatory Capital Amount and Ratios) (Details) - USD ($) $ in Millions	Oct. 01, 2020	Jun. 30, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
BHC Enhanced Prudential Standards, Minimum		$ 100,000
Minimum capital conservation buffer	3.50%	2.50%	2.50%
BHC stress capital buffer threshold		$ 100,000
BHC capital requirement, dividend payout ratio		30.00%
Capital conservation buffer		5.59%	4.76%
Phase-in of capital impact of Accounting Standards Update 2016-13		25.00%
CECL scaling factor		25.00%
Common Equity Tier One Capital – threshold for deduction of certain items, individually		10.00%
Common Equity Tier One Capital - threshold for deduction of certain items, collectively		15.00%
Risk weighting for certain items not deducted		100.00%
Common Equity Tier One Capital - threshold for deduction of certain items, transitional		25.00%
Risk weighting for certain items not deducted, transitional		250.00%
Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Phase-in of capital impact of Accounting Standards Update 2016-13		25.00%
CECL scaling factor		25.00%
Reduction to Common Equity Tier 1 Capital from CECL		$ 1,200
Ally Financial Inc
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio		10.09%	9.54%
Common equity tier one capital		$ 13,826	$ 13,837
Tier one capital to risk-weighted assets, amount		$ 16,235	$ 16,271
Tier one capital to risk-weighted assets, ratio		11.85%	11.22%
Capital to risk-weighted assets, amount		$ 18,895	$ 18,506
Capital to risk-weighted assets, ratio		13.79%	12.76%
Tier one leverage to adjusted quarterly average assets, amount		$ 16,235	$ 16,271
Tier one leverage to adjusted quarterly average assets, ratio		8.93%	9.08%
Ally Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier one capital ratio		13.21%	12.30%
Minimum capital conservation buffer		2.50%
Common equity tier one capital		$ 16,918	$ 16,627
Tier one capital to risk-weighted assets, amount		$ 16,918	$ 16,627
Tier one capital to risk-weighted assets, ratio		13.21%	12.30%
Capital to risk-weighted assets, amount		$ 18,522	$ 17,854
Capital to risk-weighted assets, ratio		14.46%	13.21%
Tier one leverage to adjusted quarterly average assets, amount		$ 16,918	$ 16,627
Tier one leverage to adjusted quarterly average assets, ratio		9.94%	10.01%
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%
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. 14, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accelerated Share Repurchases [Line Items]
Treasury stock, common, amount		$ 0	$ 229	$ 0	$ 229	$ 104	$ 299	$ 300	$ 211
Treasury stock, common, shares		53,000	7,775,000	53,000	7,775,000	3,838,000	9,554,000	9,287,000	8,113,000
Common stock, shares outstanding		373,837,123	392,775,000	373,837,123	392,775,000	373,155,000	374,331,998	383,523,000	399,761,000	404,900,000
Dividends declared, amount per common share		$ 0.19	$ 0.17	$ 0.19	$ 0.17	$ 0.19	$ 0.17	$ 0.17	$ 0.17
Cash dividends declared per common share		$ 0.19	$ 0.17	$ 0.38	$ 0.34
Stock repurchase program, authorized amount			$ 1,250		$ 1,250
Common stock | Subsequent event
Accelerated Share Repurchases [Line Items]
Dividends Payable, Date Declared	Jul. 14, 2020
Cash dividends declared per common share	$ 0.19
Dividends Payable, Date to be Paid	Aug. 14, 2020
Dividends Payable, Date of Record	Jul. 31, 2020

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash and securities collateral placed with counterparties	$ 2
Noncash collateral placed with counterparties	143	$ 118
Cash collateral received from counterparties	$ 2	40
Noncash collateral received from counterparties		$ 29

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, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	$ 14	$ 64
Fair value of derivative contracts in payable position	2	5
Derivative, notional amount	12,081	32,489
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	62
Fair value of derivative contracts in payable position	0	3
Derivative, notional amount	11,360	31,358
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	14	2
Fair value of derivative contracts in payable position	2	2
Derivative, notional amount	721	1,131
Interest rate contracts | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	12	2
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	562	1,019
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	11,215	17,101
Interest rate purchased options | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	0	62
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	0	14,100
Interest rate purchased 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	0	0
Derivative, notional amount	0	416
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	117	81
Interest rate written options | Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Fair value of derivative contracts in receivable position	12	2
Fair value of derivative contracts in payable position	0	0
Derivative, notional amount	445	522
Foreign exchange contracts | 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	2
Derivative, notional amount	157	112
Foreign exchange forwards | 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	3
Derivative, notional amount	145	157
Foreign exchange 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	2
Derivative, notional amount	157	112
Equity Contract | 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	2	0
Derivative, notional amount	2	0
Equity Contract Put Option | 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	2	0
Derivative, notional amount	1	0
Purchased 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	0	0
Derivative, notional amount	$ 1	$ 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	Jun. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost	$ 597	$ 230
Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	1,270	1,217
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	50	18
Hedged asset, last-of-layer, amount	490	0
Hedge basis adjustment, last-of-layer	3
Finance receivables and Loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Fair Value Hedge	36,211	33,312
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	334	135
Hedged asset, last-of-layer, amount	10,200	10,200
Hedge basis adjustment, last-of-layer	255	91
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Fair Value Hedge	10,020	11,995
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	196	24
Discontinued hedge | Available-for-sale securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	32	18
Hedged asset, last-of-layer, amount	690	200
Hedge basis adjustment, last-of-layer	22	2
Discontinued hedge | Finance receivables and Loans, net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	79	44
Hedged asset, last-of-layer, amount	17,500	12,800
Hedge basis adjustment, last-of-layer	79	43
Discontinued hedge | Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	$ 196	$ 127

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	$ (28)	$ (4)	$ (35)	$ (9)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	(23)	(2)	(38)	(6)
Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	(5)	(2)	3	(3)
Gains on mortgage and automotive loans | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	0	0	(15)	1
Other income, net of losses | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	(23)	(2)	(23)	(7)
Other income, net of losses | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net, pretax	$ (5)	$ (2)	$ 3	$ (3)

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Interest and fees on finance receivables and loans	$ 1,630	$ 1,860	$ 3,372	$ 3,667
Interest and dividends on investment securities and other earning assets	197	244	423	484
Interest on deposits	541	651	1,133	1,243
Interest on long-term debt	318	407	666	826
Earnings on cash flow hedges to be recognized within twelve months			87
Designated as hedging instrument | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	22	0	25	0
Designated as hedging instrument | Interest and dividends on investment securities and other earning assets
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
Designated as hedging instrument | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	(2)	0	(5)	1
Designated as hedging instrument | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedges	0	0	0	0
Derivative, Gain (Loss) on Derivative, Net	0	4	0	8
Designated as hedging instrument | Unsecured debt | Interest and fees on finance receivables and loans
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
Designated as hedging instrument | Unsecured debt | Interest and dividends on investment securities and other earning assets
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
Designated as hedging instrument | Unsecured debt | Interest on deposits
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
Designated as hedging instrument | Unsecured debt | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	0	(19)	(170)	(19)
Change in unrealized gain (loss) on fair value hedging instruments	0	19	170	19
Designated as hedging instrument | Available-for-sale securities | Interest and fees on finance receivables and loans
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
Designated as hedging instrument | Available-for-sale securities | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	4	2	45	12
Change in unrealized gain (loss) on fair value hedging instruments	(4)	(2)	(45)	(12)
Designated as hedging instrument | Available-for-sale securities | Interest on deposits
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
Designated as hedging instrument | Available-for-sale securities | Interest on long-term debt
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
Designated as hedging instrument | Fixed-rate automotive loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	(23)	98	225	141
Change in unrealized gain (loss) on fair value hedging instruments	23	(98)	(225)	(141)
Designated as hedging instrument | Fixed-rate automotive loans | Interest and dividends on investment securities and other earning assets
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
Designated as hedging instrument | Fixed-rate automotive loans | Interest on deposits
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
Designated as hedging instrument | Fixed-rate automotive loans | Interest on long-term debt
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
Designated as hedging instrument | Variable-rate commercial loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	22	0	25	0
Designated as hedging instrument | Variable-rate commercial loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Deposit liabilities | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Deposit liabilities | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Deposit liabilities | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	(2)	0	(5)	1
Designated as hedging instrument | Deposit liabilities | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest and dividends on investment securities and other earning assets
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest on deposits
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	0	0	0	0
Designated as hedging instrument | Variable-rate commercial loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cash flow hedge gain (loss) reclassified to earnings	$ 0	$ 4	$ 0	$ 8

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Interest And Amortization Income (Expense) Hedging Relationship	$ (51)	$ 2	$ (73)	$ 4
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			1	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	(4)	(1)	(5)	(1)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0	0
Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Total Interest And Amortization Income (Expense) Hedging Relationship	(4)	1	(4)	1
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0	1
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
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
Unsecured debt | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on amortization of deferred basis adjustments	2	6	8	12
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
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
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	(6)	(5)	(12)	(11)
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	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	(2)	(1)	(3)	(1)
Gain (loss) on interest for qualifying hedge	(2)	0	(2)	0
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	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	(13)	(9)	(26)	(13)
Gain (loss) on interest for qualifying hedge	(38)	11	(47)	17
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 commercial loans | Interest and fees on finance receivables and loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge			1	0
Variable-rate commercial loans | 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
Variable-rate commercial loans | Interest on long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest for qualifying hedge			$ 0	$ 0

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss), net investment hedge, foreign exchange contracts	$ (5)	$ (3)	$ 7	$ (5)
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	(19)	22	150	12
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	(6)	(3)	6	(5)
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 (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit) from continuing operations	$ 95	$ (90)	$ 3	$ 21
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, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 613	$ 616
Derivative assets	12	28
Derivative liabilities	$ 0	$ (1)
Investment in any one industry did not exceed percentage	11.00%	13.00%
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 29,225	$ 30,284
Derivative assets	14	64
Assets, fair value	29,952	31,007
Derivative liabilities	(2)	(5)
Liabilities, fair value	2	5
Fair value, measurements, recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		(5)
Fair value, measurements, recurring | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(2)
Fair value, measurements, recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	613	616
Fair value, measurements, recurring | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	807	2,048
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	913	641
Fair value, measurements, recurring | Foreign government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	162	186
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	19,884	21,404
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	1,786	1,382
Fair value, measurements, recurring | Mortgage-backed residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	3,425	2,850
Fair value, measurements, recurring | Mortgage-backed commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	38	42
Fair value, measurements, recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	356	368
Fair value, measurements, recurring | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,854	1,363
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	91	30
Fair value, measurements, recurring | Finance receivables and loans, net | Consumer portfolio segment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	8	11
Fair value, measurements, recurring | Interests retained in financial asset sales
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained interest, fair value	1	2
Fair value, measurements, recurring | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	12	64
Fair value, measurements, recurring | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2
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	822	2,062
Derivative assets	2	0
Assets, fair value	1,432	2,670
Derivative liabilities	(2)	0
Liabilities, fair value	2	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 liabilities		0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	(2)
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	608	608
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	807	2,047
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	15	15
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 | Finance receivables and loans, net | Consumer portfolio segment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0	0
Fair value, measurements, recurring | Fair value, inputs, level 1 | Interests retained in financial asset sales
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 | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2
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	28,398	28,220
Derivative assets	0	62
Assets, fair value	28,398	28,282
Derivative liabilities	0	(5)
Liabilities, fair value	0	5
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 liabilities		(5)
Fair value, measurements, recurring | Fair value, inputs, level 2 | Other Contract [Member]
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	0	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	908	639
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	147	171
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	19,884	21,404
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	1,786	1,382
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	3,425	2,850
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	38	42
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	356	368
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	1,854	1,363
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 | Finance receivables and loans, net | Consumer portfolio segment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0	0
Fair value, measurements, recurring | Fair value, inputs, level 2 | Interests retained in financial asset sales
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	0	62
Fair value, measurements, recurring | Fair value, inputs, level 2 | Other Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0
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	5	2
Derivative assets	12	2
Assets, fair value	122	55
Derivative liabilities	0	0
Liabilities, fair value	0	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 liabilities		0
Fair value, measurements, recurring | Fair value, inputs, level 3 | Other Contract [Member]
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	5	8
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	5	2
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	91	30
Fair value, measurements, recurring | Fair value, inputs, level 3 | Finance receivables and loans, net | Consumer portfolio segment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	8	11
Fair value, measurements, recurring | Fair value, inputs, level 3 | Interests retained in financial asset sales
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Retained interest, fair value	1	2
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	12	$ 2
Fair value, measurements, recurring | Fair value, inputs, level 3 | Other Contract [Member]
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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			$ 0	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0	0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, gain (loss) included in earnings	$ 14	$ 5	20	12
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	681	156	990	246
Fair value, measurement, recurring, asset, sales	(661)	(152)	(930)	(236)
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	(6)	(5)	(13)	(5)
Fair value, assets, recurring, net unrealized gains (losses)	6	2	9	8
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, gain (loss) included in earnings	1	2	(3)	6
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	(4)	0	(4)
Fair value, assets, recurring, net unrealized gains (losses)	1	2	(3)	6
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Available-for-sale securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, gain (loss) included in earnings	0		0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0		0
Fair value, measurement, recurring, asset, purchases	2		3
Fair value, measurement, recurring, asset, sales	0		0
Fair value, measurement , recurring, asset, issuances	0		0
Fair value, measurement, recurring, asset, settlements	0		0
Fair value, assets, recurring, net unrealized gains (losses)	0		0
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, gain (loss) included in earnings	8	3	13	4
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0	0	0	0
Fair value, measurement, recurring, asset, purchases	676	156	978	246
Fair value, measurement, recurring, asset, sales	(661)	(152)	(930)	(236)
Fair value, measurement , recurring, asset, issuances	0	0	0	0
Fair value, measurement, recurring, asset, settlements	0	0	0	0
Fair value, assets, recurring, net unrealized gains (losses)	1	0	2	0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Finance receivables and Loans, net | Consumer Loan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, gain (loss) included in earnings	1		0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss)	0		0
Fair value, measurement, recurring, asset, purchases	3		9
Fair value, measurement, recurring, asset, sales	0		0
Fair value, measurement , recurring, asset, issuances	0		0
Fair value, measurement, recurring, asset, settlements	(6)		(12)
Fair value, assets, recurring, net unrealized gains (losses)	0		0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0		0
Interests retained in financial asset sales
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
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	0	(1)	(1)	(1)
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	0	0
Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset, gain (loss) included in earnings	4	0	10	2
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, assets, recurring, net unrealized gains (losses)	4	0	10	2
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income	0	0	0	0
Fair value, measurements, recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	94	32	55	19
Fair value, measurement, recurring, asset value, ending balance	122	36	122	36
Fair value, measurements, recurring | Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	4	11	8	7
Fair value, measurement, recurring, asset value, ending balance	5	9	5	9
Fair value, measurements, recurring | Available-for-sale securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	3		2
Fair value, measurement, recurring, asset value, ending balance	5		5
Fair value, measurements, recurring | 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	68	15	30	8
Fair value, measurement, recurring, asset value, ending balance	91	22	91	22
Fair value, measurements, recurring | Finance receivables and Loans, net | Consumer Loan
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	10		11
Fair value, measurement, recurring, asset value, ending balance	8		8
Fair value, measurements, recurring | Interests retained in financial asset sales
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	1	4	2	4
Fair value, measurement, recurring, asset value, ending balance	1	3	1	3
Fair value, measurements, recurring | Derivative assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, measurement, recurring, asset value, beginning balance	8	2	2	0
Fair value, measurement, recurring, asset value, ending balance	$ 12	$ 2	$ 12	$ 2

Fair Value (Fair Value Measur_3

Fair Value (Fair Value Measurements - Nonrecurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, net	$ 404		$ 404		$ 158
Finance receivables and loans, net	114,880		114,880		126,968
Goodwill impairment	50	$ 0	50	$ 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	313		313		128
Lower of cost or fair value, valuation reserve, or cumulative adjustments	0		0		0
Nonmarketable equity investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	5		5		12
Lower of cost or fair value, valuation reserve, or cumulative adjustments	(4)		(4)		0
Goodwill | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	143		143
Lower of cost or fair value, valuation reserve, or cumulative adjustments	(50)		(50)
Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	8		8		12
Lower of cost or fair value, valuation reserve, or cumulative adjustments	0		0		(1)
Assets | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	566		566		265
Lower of cost or fair value, valuation reserve, or cumulative adjustments	(81)		(81)		(40)
Equity Method Investments | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure					4
Lower of cost or fair value, valuation reserve, or cumulative adjustments					(6)
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		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 Disclosure	0		0		0
Fair value, inputs, level 1 | Goodwill | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		0
Fair value, inputs, level 1 | Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		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		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 Disclosure					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		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 Disclosure	0		0		5
Fair value, inputs, level 2 | Goodwill | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		0
Fair value, inputs, level 2 | Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	0		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		5
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 Disclosure					0
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	313		313		128
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 Disclosure	5		5		7
Fair value, inputs, level 3 | Goodwill | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	143		143
Fair value, inputs, level 3 | Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	8		8		12
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	566		566		260
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 Disclosure					4
Commercial portfolio segment | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	97		97		109
Lower of cost or fair value, valuation reserve, or cumulative adjustments	(27)		(27)		(33)
Commercial portfolio segment | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0		0		0
Commercial portfolio segment | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0		0		0
Commercial portfolio segment | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	97		97		109
Automotive loan | Commercial portfolio segment | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	53		53		64
Lower of cost or fair value, valuation reserve, or cumulative adjustments	(17)		(17)		(12)
Automotive loan | Commercial portfolio segment | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0		0		0
Automotive loan | Commercial portfolio segment | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0		0		0
Automotive loan | Commercial portfolio segment | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	53		53		64
Other loan | Commercial portfolio segment | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	44		44		45
Lower of cost or fair value, valuation reserve, or cumulative adjustments	(10)		(10)		(21)
Other loan | Commercial portfolio segment | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0		0		0
Other loan | Commercial portfolio segment | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	0		0		0
Other loan | Commercial portfolio segment | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance receivables and loans, net	$ 44		44		$ 45
Corporate and Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment			$ 50

Fair Value (Fair Value of Finan

Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	$ 1,390	$ 1,568
Loans held-for-sale, net	404	158
Finance receivables and loans, net	114,880	126,968
Deposit liabilities	131,036	120,752
Short-term borrowings	3,689	5,531
Long-term debt	29,176	34,027
Reported value measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	1,390	1,568
Loans held-for-sale, net	313	128
Finance receivables and loans, net	114,872	126,957
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	1,000	1,150
Deposit liabilities	60,340	60,146
Short-term borrowings	3,689	5,531
Long-term debt	29,176	34,027
Estimate of fair value measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity securities	1,476	1,600
Loans held-for-sale, net	313	128
Finance receivables and loans, net	120,845	130,837
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	1,000	1,150
Deposit liabilities	61,429	60,678
Short-term borrowings	3,692	5,532
Long-term debt	31,685	36,927
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	1,476	1,600
Loans held-for-sale, net	0	0
Finance receivables and loans, net	0	0
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	1,000	1,150
Deposit liabilities	0	0
Short-term borrowings	0	0
Long-term debt	19,462	22,789
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	313	128
Finance receivables and loans, net	120,845	130,837
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	0	0
Deposit liabilities	61,429	60,678
Short-term borrowings	3,692	5,532
Long-term debt	$ 12,223	$ 14,138

Offsetting Assets and Liabili_3

Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 2	$ 62
Derivative Assets, Gross Amounts Offset on the Condensed Consolidated Balance Sheet	0	0
Net amounts of assets presented on the Condensed Consolidated Balance Sheet	2	62
Derivative Asset, Financial Instruments Not Offset	(2)	0
Derivative, Collateral, Obligation to Return Cash	0	(36)
Derivative Assets in Net Asset Position	0	26
Derivative Assets With No Offsetting Arrangements	12	2
Derivative, Collateral, Obligation to Return Securities - No Offsetting Arrangements	0	0
Derivative, Collateral, Obligation to Return Cash - No Offsetting Arrangements	0	0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	14	64
Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement Not Offset Against Collateral	14	64
Derivative Asset	12	28
Derivative Liability, Net Asset Position	2
Derivative Liabilities - Gross Amounts Offset on the Condensed Consolidated Balance Sheet	0	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
Securities sold under agreements to repurchase, gross	79	0
Securities Sold under Agreements to Repurchase	79
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	79
Securities Sold under Agreements to Repurchase, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	0
Total liabilities, gross amounts recognized	81	5
Total liabilities, net amounts presented on the balance sheet	81	5
Derivative Liabilities, Financial Instruments Not Offset	(2)	0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash	(79)	(4)
Derivative Liability	$ 0	1
Derivative Liability, Fair Value, Gross Liability		5
Net Amounts of Liabilities Presented on the Condensed Consolidated Balance Sheet		5
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0
Derivative Liabilities, Collateral Amounts Not Offset		(4)
Derivative, Net Liability Position, Aggregate Fair Value		1
Derivative Asset, Fair Value of Collateral		29
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value		$ 29

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Number of operating segments			4
Net financing revenue and other interest income	$ 1,054	$ 1,157	$ 2,200	$ 2,289
Other revenue	555	395	821	861
Total net revenue	1,609	1,552	3,021	3,150
Provision for credit losses	287	177	1,190	459
Total noninterest expense	985	881	1,905	1,711
Income (loss) from continuing operations before income tax expense	337	494	(74)	980
Total assets	184,061	180,448	184,061	180,448	$ 180,644
Net financing revenue and other interest income after the provision for credit losses	767	980	1,000	1,800
Operating Segments | Automotive Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	989	1,022	2,029	2,002
Other revenue	40	61	87	129
Total net revenue	1,029	1,083	2,116	2,131
Provision for credit losses	256	180	1,022	442
Total noninterest expense	444	444	938	901
Income (loss) from continuing operations before income tax expense	329	459	156	788
Total assets	102,016	114,955	102,016	114,955
Operating Segments | Insurance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	12	15	26	27
Other revenue	438	286	575	646
Total net revenue	450	301	601	673
Provision for credit losses	0	0	0	0
Total noninterest expense	322	301	578	528
Income (loss) from continuing operations before income tax expense	128	0	23	145
Total assets	8,740	8,241	8,740	8,241
Operating Segments | Mortgage Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	30	46	68	96
Other revenue	19	4	29	6
Total net revenue	49	50	97	102
Provision for credit losses	3	0	4	2
Total noninterest expense	38	36	73	73
Income (loss) from continuing operations before income tax expense	8	14	20	27
Total assets	16,669	16,584	16,669	16,584
Operating Segments | Corporate Finance operations
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	77	61	145	115
Other revenue	6	10	19	21
Total net revenue	83	71	164	136
Provision for credit losses	25	3	139	26
Total noninterest expense	26	22	61	51
Income (loss) from continuing operations before income tax expense	32	46	(36)	59
Total assets	6,206	4,980	6,206	4,980
Corporate and Other
Segment Reporting Information [Line Items]
Net financing revenue and other interest income	(54)	13	(68)	49
Other revenue	52	34	111	59
Total net revenue	(2)	47	43	108
Provision for credit losses	3	(6)	25	(11)
Total noninterest expense	155	78	255	158
Income (loss) from continuing operations before income tax expense	(160)	(25)	(237)	(39)
Total assets	$ 50,430	$ 35,688	$ 50,430	$ 35,688

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Jul. 14, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Subsequent Event [Line Items]
Cash dividends declared per common share		$ 0.19	$ 0.17	$ 0.38	$ 0.34
Subsequent event | Common stock
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Jul. 14, 2020
Cash dividends declared per common share	$ 0.19
Dividends Payable, Date to be Paid	Aug. 14, 2020
Dividends Payable, Date of Record	Jul. 31, 2020

Uncategorized Items - ally20206

Label	Element	Value
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 123,000,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(531,000,000)
Treasury Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(2,049,000,000)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(3,088,000,000)
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	21,438,000,000
Mortgage - Legacy [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	0
Converted to term loans	ally_Convertedtotermloans	123,000,000
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	351,000,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	510,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Mortgage - Legacy [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	0
Converted to term loans	ally_Convertedtotermloans	1,000,000
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	5,000,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	17,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Mortgage - Legacy [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	0
Converted to term loans	ally_Convertedtotermloans	0
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	1,000,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Mortgage - Legacy [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	0
Converted to term loans	ally_Convertedtotermloans	2,000,000
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	2,000,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	8,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Mortgage - Legacy [Member] | Current period [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	0
Converted to term loans	ally_Convertedtotermloans	120,000,000
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	343,000,000
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	482,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Loans and Leases Receivable, Gross	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	945,000,000
Mortgage Finance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	3,014,000,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1,391,000,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	2,397,000,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3,167,000,000
Converted to term loans	ally_Convertedtotermloans	1,000,000
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	4,403,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	2,056,000,000
Mortgage Finance [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1,000,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	2,000,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1,000,000
Converted to term loans	ally_Convertedtotermloans	0
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	6,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Mortgage Finance [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1,000,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	4,000,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	3,000,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	1,000,000
Converted to term loans	ally_Convertedtotermloans	0
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	0
Mortgage Finance [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	7,000,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	11,000,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	12,000,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	14,000,000
Converted to term loans	ally_Convertedtotermloans	0
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	30,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	9,000,000
Mortgage Finance [Member] | Current period [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	3,006,000,000
Financing Receivable, Originated Four Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1,375,000,000
Financing Receivable, Originated Two Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	2,380,000,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3,151,000,000
Converted to term loans	ally_Convertedtotermloans	1,000,000
Financing Receivable, Revolving	us-gaap_FinancingReceivableRevolving	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	4,364,000,000
Financing Receivable, Originated in Current Fiscal Year	us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear	2,047,000,000
Loans and Leases Receivable, Gross	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	16,324,000,000
Accounting Standards Update 2017-08 [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(2,000,000)
Accounting Standards Update 2017-08 [Member] | AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	8,000,000
Accounting Standards Update 2017-08 [Member] | Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ (10,000,000)