TD Ameritrade Holding 10-K 20 Nov 15 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2015	Nov. 06, 2015	Mar. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	AMTD
Entity Registrant Name	TD AMERITRADE HOLDING CORP
Entity Central Index Key	1,173,431
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		536,658,111
Entity Public Float			$ 9.4

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
ASSETS
Cash and cash equivalents	$ 1,978	$ 1,460
Cash and investments segregated and on deposit for regulatory purposes	6,305	5,116
Receivable from brokers, dealers and clearing organizations	862	1,108
Receivable from clients, net	12,770	11,639
Receivable from affiliates	93	99
Other receivables, net	144	147
Securities owned, at fair value	425	332
Property and equipment at cost, net	521	543
Goodwill	2,467	2,467
Acquired intangible assets, net	661	751
Other assets	149	167
Total assets	26,375	23,829
Liabilities:
Payable to brokers, dealers and clearing organizations	2,707	2,421
Payable to clients	16,035	14,497
Accounts payable and other liabilities	637	595
Payable to affiliates	6	5
Notes payable	0	150
Long-term debt	1,800	1,099
Deferred income taxes	287	314
Total liabilities	21,472	19,081
Stockholders' equity:
Preferred stock, $0.01 par value, 100 million shares authorized; none issued	0	0
Common stock, $0.01 par value, one billion shares authorized; 631 million shares issued; 2015 — 537 million shares outstanding; 2014 — 545 million shares outstanding	6	6
Additional paid-in capital	1,649	1,618
Retained earnings	5,038	4,551
Treasury stock, common, at cost: 2015 — 94 million shares; 2014 — 86 million shares	(1,765)	(1,409)
Accumulated other comprehensive loss	(25)	(18)
Total stockholders' equity	4,903	4,748
Total liabilities and stockholders' equity	$ 26,375	$ 23,829

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2015	Sep. 30, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	631,000,000	631,000,000
Common stock, shares outstanding	537,000,000	545,000,000
Treasury stock, shares	94,000,000	86,000,000

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Transaction-based revenues:
Commissions and transaction fees	$ 1,401	$ 1,351	$ 1,171
Asset-based revenues:
Insured deposit account fees	839	820	804
Net interest revenue	622	581	469
Investment product fees	334	309	250
Total asset-based revenues	1,795	1,710	1,523
Other revenues	51	62	70
Net revenues	3,247	3,123	2,764
Operating expenses:
Employee compensation and benefits	807	760	692
Clearing and execution costs	148	134	109
Communications	125	116	113
Occupancy and equipment costs	163	156	160
Depreciation and amortization	91	95	86
Amortization of acquired intangible assets	90	90	91
Professional services	159	155	145
Advertising	248	250	239
Other	91	82	73
Total operating expenses	1,922	1,838	1,708
Operating income	1,325	1,285	1,056
Other expense (income):
Interest on borrowings	43	25	25
Gain on investments, net	(7)	(10)	(57)
Other	1	0	0
Total other expense (income)	37	15	(32)
Pre-tax income	1,288	1,270	1,088
Provision for income taxes	475	483	413
Net income	$ 813	$ 787	$ 675
Earnings per share - basic (in usd per share)	$ 1.50	$ 1.43	$ 1.23
Earnings per share - diluted (in usd per share)	$ 1.49	$ 1.42	$ 1.22
Weighted average shares outstanding - basic (in shares)	543	550	549
Weighted average shares outstanding - diluted (in shares)	547	554	554
Dividends declared per share (in dollars per share)	$ 0.6	$ 0.98	$ 0.86

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 813	$ 787	$ 675
Investments available-for-sale:
Net unrealized gain	0	0	21
Reclassification adjustment for net realized gain included in net income	0	0	(52)
Reclassification of impairment charge	0	0	3
Cash flow hedging instruments:
Net unrealized loss	(15)	(29)	0
Reclassification adjustment for portion of realized loss amortized to net income	4	0	0
Total other comprehensive loss, before tax	(11)	(29)	(28)
Income tax effect	4	11	10
Total other comprehensive loss, net of tax	(7)	(18)	(18)
Comprehensive income	$ 806	$ 769	$ 657

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) Member]
Beginning Balance, Value at Sep. 30, 2012	$ 4,425	$ 6	$ 1,587	$ 4,100	$ (1,286)	$ 18
Beginning Balance (in shares) at Sep. 30, 2012	545
Shareholders Equity [Line Items]
Net income	$ 675			675
Other comprehensive loss, net of tax	(18)					(18)
Payment of cash dividends	(471)			(471)
Repurchases of common stock	$ (5)				(5)
Repurchases of common stock (in shares)	0
Common stock issued for stock-based compensation, including tax effects	$ 41		(24)		65
Common stock issued for stock-based compensation, including tax effects (in shares)	5
Stock-based compensation expense	$ 29		29
Ending Balance, Value at Sep. 30, 2013	$ 4,676	6	1,592	4,304	(1,226)	0
Ending Balance (in shares) at Sep. 30, 2013	550
Shareholders Equity [Line Items]
Net income	$ 787			787
Other comprehensive loss, net of tax	(18)					(18)
Payment of cash dividends	(540)			(540)
Repurchases of common stock	$ (207)				(207)
Repurchases of common stock (in shares)	(7)
Common stock issued for stock-based compensation, including tax effects	$ 18		(6)		24
Common stock issued for stock-based compensation, including tax effects (in shares)	2
Stock-based compensation expense	$ 32		32
Ending Balance, Value at Sep. 30, 2014	$ 4,748	6	1,618	4,551	(1,409)	(18)
Ending Balance (in shares) at Sep. 30, 2014	545
Shareholders Equity [Line Items]
Net income	$ 813			813
Other comprehensive loss, net of tax	(7)					(7)
Payment of cash dividends	(326)			(326)
Repurchases of common stock	$ (387)				(387)
Repurchases of common stock (in shares)	(11)
Common stock issued for stock-based compensation, including tax effects	$ 26		(5)		31
Common stock issued for stock-based compensation, including tax effects (in shares)	3
Stock-based compensation expense	$ 36		36
Ending Balance, Value at Sep. 30, 2015	$ 4,903	$ 6	$ 1,649	$ 5,038	$ (1,765)	$ (25)
Ending Balance (in shares) at Sep. 30, 2015	537

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 813	$ 787	$ 675
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	91	95	86
Amortization of acquired intangible assets	90	90	91
Deferred income taxes	(23)	(27)	10
Gain on investments, net	(7)	(10)	(57)
Stock-based compensation	36	32	29
Excess tax benefits on stock-based compensation	(12)	(10)	(24)
Other, net	7	3	2
Changes in operating assets and liabilities:
Cash and investments segregated and on deposit for regulatory purposes	(1,189)	778	(1,864)
Receivable from brokers, dealers and clearing organizations	246	240	(238)
Receivable from clients, net	(1,131)	(2,655)	(337)
Receivable from/payable to affiliates, net	6	19	(32)
Other receivables, net	3	(10)	(19)
Securities owned, at fair value	(92)	(10)	20
Other assets	45	(39)	4
Payable to brokers, dealers and clearing organizations	286	448	(19)
Payable to clients	1,538	1,314	2,455
Accounts payable and other liabilities	39	(20)	(43)
Net cash provided by (used in) operating activities	746	1,025	739
Cash flows from investing activities:
Purchase of property and equipment	(71)	(144)	(144)
Purchase of short-term investments	(506)	(4)	(4)
Proceeds from sale and maturity of short-term investments	504	4	154
Proceeds from sale of investments	10	25	88
Other, net	3	2	2
Net cash provided by (used in) investing activities	(60)	(117)	96
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,248	69	0
Payment of debt issuance costs	(11)	0	0
Principal payments on long-term debt	(569)	0	(250)
Proceeds from notes payable	0	230	275
Principal payments on notes payable	(150)	(80)	(275)
Payment of cash dividends	(326)	(540)	(471)
Proceeds from exercise of stock options	15	8	19
Purchase of treasury stock	(387)	(207)	(5)
Principal payments on capital lease obligations	0	0	(5)
Excess tax benefits on stock-based compensation	12	10	24
Net cash provided by (used in) financing activities	(168)	(510)	(688)
Net increase (decrease) in cash and cash equivalents	518	398	147
Cash and cash equivalents at beginning of year	1,460	1,062	915
Cash and cash equivalents at end of year	1,978	1,460	1,062
Supplemental cash flow information:
Interest paid	30	30	32
Income taxes paid	$ 498	$ 489	$ 379

Nature of Operations and Summar

Nature of Operations and Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Nature of Operations and Summary of Significant Accounting Policies	Nature of Operations and Summary of Significant Accounting Policies Basis of Presentation — The consolidated financial statements include the accounts of TD Ameritrade Holding Corporation (the "Parent"), a Delaware corporation, and its wholly-owned subsidiaries (collectively, the "Company"). Intercompany balances and transactions have been eliminated. Nature of Operations — The Company provides securities brokerage services, including trade execution, clearing services and margin lending, through its broker-dealer subsidiaries; futures and foreign exchange trade execution services through its futures commission merchant ("FCM") subsidiary; and trustee, custodial and other trust-related services to retirement plans and other custodial accounts through its state-chartered trust company subsidiary. The Company also provides cash sweep and deposit account products through third-party relationships. The Company's broker-dealer subsidiaries are subject to regulation by the Securities and Exchange Commission ("SEC"), the Financial Industry Regulatory Authority ("FINRA") and the various exchanges in which they maintain membership. The Company's FCM subsidiary is subject to regulation by the Commodity Futures Trading Commission ("CFTC") and the National Futures Association ("NFA"). Dividends from the Company's broker-dealer, FCM and trust company subsidiaries are a source of liquidity for the holding company. Requirements of the SEC, FINRA and CFTC relating to liquidity, net capital standards and the use of client funds and securities may limit funds available for the payment of dividends from the broker-dealer and FCM subsidiaries to the holding company. State regulatory requirements may limit funds available for the payment of dividends from the trust company subsidiary to the holding company. Use of Estimates — The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents — The Company considers temporary, highly-liquid investments with an original maturity of three months or less to be cash equivalents, except for amounts required to be segregated for regulatory purposes. Cash and Investments Segregated and on Deposit for Regulatory Purposes — Cash and investments segregated and on deposit for regulatory purposes consists primarily of qualified deposits in special reserve bank accounts for the exclusive benefit of clients under Rule 15c3-3 of the Securities Exchange Act of 1934 (the "Exchange Act") and other regulations. Funds can be held in cash, reverse repurchase agreements, U.S. Treasury securities and other qualified securities. Reverse repurchase agreements (securities purchased under agreements to resell) are treated as collateralized financing transactions and are carried at amounts at which the securities will subsequently be resold, plus accrued interest. The Company's reverse repurchase agreements are collateralized by U.S. Treasury securities and generally have a maturity of seven days. Cash and investments segregated and on deposit for regulatory purposes also includes amounts that have been segregated or secured for the benefit of futures clients according to the regulations of the CFTC governing futures commission merchants. Securities Borrowed and Securities Loaned — Securities borrowed and securities loaned transactions are recorded at the amount of cash collateral provided or received. Securities borrowed transactions require the Company to provide the counterparty with collateral in the form of cash. The Company receives collateral in the form of cash for securities loaned transactions. For these transactions, the fees earned or incurred by the Company are recorded as net interest revenue on the Consolidated Statements of Income. The related interest receivable from and the brokerage interest payable to broker-dealers are included in other receivables and in accounts payable and other liabilities, respectively, on the Consolidated Balance Sheets. Receivable from/Payable to Clients — Receivable from clients primarily consists of margin loans to securities brokerage clients, which are collateralized by client securities, and is carried at the amount receivable, net of an allowance for doubtful accounts that is primarily based on the amount of unsecured margin balances. Payable to clients primarily consists of client cash held in brokerage accounts and is carried at the amount of client cash on deposit. The Company earns interest revenue and pays interest expense on its receivable from client and payable to client balances, respectively. The interest revenue and expense are included in net interest revenue on the Consolidated Statements of Income. Securities Owned — Securities owned by our broker-dealer subsidiaries are recorded on a trade-date basis and carried at fair value, and the related changes in fair value are generally included in other revenues on the Consolidated Statements of Income. Property and Equipment — Property and equipment is recorded at cost, net of accumulated depreciation and amortization, except for land, which is recorded at cost. Depreciation is provided using the straight-line method over the estimated useful service lives of the assets, which range from seven to 40 years for buildings and building components and three to seven years for all other depreciable property and equipment. Leasehold improvements are amortized over the lesser of the economic useful life of the improvement or the term of the lease. Software Development — From the date technological feasibility has been established until beta testing is complete, software development costs are capitalized and included in property and equipment. Once the product is fully functional, such costs are amortized in accordance with the Company's normal accounting policies. Software development costs that do not meet capitalization criteria are expensed as incurred. Goodwill — The Company has recorded goodwill for purchase business combinations to the extent the purchase price of each completed acquisition exceeded the fair value of the net identifiable assets of the acquired company. The Company tests goodwill for impairment on at least an annual basis. In performing the impairment tests, the Company utilizes quoted market prices of the Company's common stock to estimate the fair value of the Company as a whole. The estimated fair value is then allocated to the Company's reporting units based on operating revenues, and is compared with the carrying value of the reporting units. No impairment charges have resulted from the annual impairment tests. Amortization of Acquired Intangible Assets — Acquired intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives, ranging from three to 23 years. The acquired intangible asset associated with a trademark license agreement is not subject to amortization because the term of the agreement is considered to be indefinite. Long-Lived Assets and Acquired Intangible Assets — The Company reviews its long-lived assets and finite-lived acquired intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. The Company evaluates recoverability by comparing the undiscounted cash flows associated with the asset to the asset's carrying amount. The Company also evaluates the remaining useful lives of intangible assets to determine if events or trends warrant a revision to the remaining period of amortization. The Company tests its indefinite-lived acquired intangible asset for impairment on at least an annual basis. To determine if the indefinite-lived intangible asset is impaired, the Company first assesses certain qualitative factors. Based on this assessment, if it is determined that more likely than not the fair value of the indefinite-lived intangible asset is less than its carrying amount, the Company performs a quantitative impairment test. No impairment charges have resulted from the annual impairment tests. Income Taxes — The Company files a consolidated U.S. income tax return with its subsidiaries on a calendar year basis, combined returns for state tax purposes where required and certain of its subsidiaries file separate state income tax returns where required. Deferred tax assets and liabilities are determined based on the differences between the financial statement carrying amounts and tax bases of assets and liabilities using enacted tax rates expected to apply to taxable income in the periods in which the deferred tax asset or liability is expected to be settled or realized. Uncertain tax positions are recognized if they are more likely than not to be sustained upon examination, based on the technical merits of the position. The amount of tax benefit recognized is the largest amount of benefit that is greater than 50% likely of being realized upon settlement. The Company recognizes interest and penalties, if any, related to income tax matters as part of the provision for income taxes on the Consolidated Statements of Income. Capital Stock — The authorized capital stock of the Company consists of a single class of common stock and one or more series of preferred stock as may be authorized for issuance by the Company's board of directors. Voting, dividend, conversion and liquidation rights of the preferred stock would be established by the board of directors upon issuance of such preferred stock. Stock-Based Compensation — The Company measures and recognizes compensation expense based on estimated grant date fair values for all stock-based payment arrangements. Stock-based compensation expense is based on awards expected to vest and therefore is reduced for estimated forfeitures. Forfeitures are estimated at the time of grant based on the Company's historical forfeiture experience and revised in subsequent periods if actual forfeitures differ from those estimates. Transaction-based Revenues — Client securities trades are recorded on a settlement-date basis with such trades generally settling within three business days after the trade date. Revenues and expenses related to client trades, including order routing revenue (also referred to as payment for order flow) and revenues from markups on riskless principal trades in fixed-income securities, are recorded on a trade-date basis. Revenues related to client trades are recorded net of promotional allowances. Securities owned by clients, including those that collateralize margin or similar transactions, are not reflected in the accompanying consolidated financial statements. Net Interest Revenue — Net interest revenue primarily consists of income generated by client cash and interest charged to clients on margin balances, net of interest paid to clients on their credit balances. It also includes net interest revenue from securities borrowed and securities loaned transactions. Insured Deposit Account Fees — Insured deposit account fees consist of revenues resulting from the Insured Deposit Account ("IDA") agreement with TD Bank USA, N.A. ("TD Bank USA"), TD Bank, N.A. and The Toronto-Dominion Bank ("TD"). Under the IDA agreement, TD Bank USA and TD Bank, N.A. (together, the "TD Depository Institutions") make available to clients of the Company FDIC-insured money market deposit accounts as either designated sweep vehicles or as non-sweep deposit accounts. The Company provides marketing, recordkeeping and support services for the TD Depository Institutions with respect to the money market deposit accounts. In exchange for providing these services, the TD Depository Institutions pay the Company an aggregate marketing fee based on the weighted average yield earned on the client IDA assets, less the actual interest paid to clients, a servicing fee to the TD Depository Institutions and the cost of FDIC insurance premiums. The IDA agreement is described further in Note 18 . Investment Product Fees — Investment product fee revenue consists of revenues earned on client assets invested in money market mutual funds, other mutual funds and certain Company-sponsored investment programs. During fiscal 2015, the Company introduced a fee rebate offer related to its Amerivest ® investment program. For client assets subject to the rebate offer, if the model portfolio in which the client is invested experiences two consecutive quarters of negative performance (before advisory fees), the Company will refund the advisory fees for both quarters to the client. Advisory fee revenue subject to the rebate offer is recognized once the Company is no longer obligated to refund the fees to the client based on the rebate criteria. As of September 30, 2015, the Company had rebate obligations of $7 million and deferred advisory fee revenue of $3 million , which are included in payable to clients and accounts payable and other liabilities, respectively, on the Consolidated Balance Sheets. Advertising — The Company expenses advertising costs the first time the advertising takes place. Client cash offers are also characterized as advertising expense, rather than as a reduction of revenue, because there is generally little or no cumulative revenue associated with an individual client earning a cash offer at the time the consideration is recognized in the Consolidated Statement of Income. Derivatives and Hedging Activities — The Company occasionally utilizes derivative instruments to manage risks, which may include market price, interest rate and foreign currency risks. The Company does not use derivative instruments for speculative or trading purposes. Derivatives are recorded on the Consolidated Balance Sheets as assets or liabilities at fair value. Derivative instruments properly designated to hedge exposure to changes in the fair value of assets or liabilities are accounted for as fair value hedges. Derivative instruments properly designated to hedge exposure to the variability of expected future cash flows or other forecasted transactions are accounted for as cash flow hedges. The Company formally documents the risk management objective and strategy for each hedge transaction. Derivative instruments that do not qualify for hedge accounting are carried at fair value on the Consolidated Balance Sheets with unrealized gains and losses recorded currently on the Consolidated Statements of Income. Cash flows from derivative instruments accounted for as fair value hedges or cash flow hedges are classified in the same category on the Consolidated Statements of Cash Flows as the cash flows from the items being hedged. For additional information on the Company's fair value and cash flow hedging instruments, see Note 8 . Earnings Per Share — Basic earnings per share ("EPS") is computed by dividing net income by the weighted average common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, except when such assumed exercise or conversion would have an antidilutive effect on EPS. The difference between the numerator and denominator used in the Company's computation of basic and diluted earnings per share consists of common stock equivalent shares related to stock-based compensation. The Company excluded from the calculation of diluted earnings per share 0.7 million shares underlying the stock-based compensation awards for fiscal year 2013 because their inclusion would have been antidilutive. There were no material antidilutive awards for fiscal years 2015 and 2014 . Recently Adopted Accounting Pronouncements ASU 2014-11 — During fiscal 2015, the Company adopted Accounting Standards Update ("ASU") 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures . The amendments in ASU 2014-11 require entities to account for repurchase-to-maturity transactions and linked repurchase financings as secured borrowings, which is consistent with the accounting for other repurchase agreements. The new accounting requirements did not result in any accounting changes because the Company does not act as a transferor in repurchase-to-maturity transactions or linked repurchase financings. In addition, the amendments require new disclosures, including information regarding collateral pledged in securities lending transactions and similar transactions that are accounted for as secured borrowings. The Company prospectively adopted the new disclosure requirements related to collateral pledged in transactions that are accounted for as secured borrowings. Adoption of ASU 2014-11 resulted only in certain additional disclosures presented in Note 15. ASU 2015-03 — On September 30, 2015, the Company retrospectively adopted, for all comparative periods presented, ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs . The amendments in ASU 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The adoption of ASU 2015-03 resulted in a change to the location where debt issuance costs are presented in the balance sheet and did not have any other material impact on the Company's financial statements. As of September 30, 2015, the Company had debt issuance costs related to recognized debt liabilities of approximately $12 million , which are included as a deduction from long-term debt on the Consolidated Balance Sheet. In order to conform to the current financial statement presentation, approximately $2 million of unamortized debt issuance costs have been reclassified from other assets to a deduction from long-term debt as of September 30, 2014 on the Consolidated Balance Sheet. Recently Issued Accounting Pronouncements ASU 2014-09 — In May 2014, the Financial Accounting Standards Board issued ASU 2014-09, Revenue from Contracts with Customers , to clarify the principles of recognizing revenue from contracts with customers and to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards. This ASU will supersede the revenue recognition requirements in Accounting Standards Codification ("ASC") Topic 605, Revenue Recognition, and most industry-specific guidance. Entities are required to apply the following steps when recognizing revenue under ASU 2014-09: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and, (5) recognize revenue when (or as) the entity satisfies a performance obligation. This ASU also requires additional disclosures related to the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. An entity may apply the amendments by using one of the following two methods: (1) retrospective application to each prior reporting period presented or (2) a modified retrospective approach, requiring the standard be applied only to the most current period presented, with the cumulative effect of initially applying the standard recognized at the date of initial application. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Therefore, ASU 2014-09 will be effective for the Company's fiscal year beginning October 1, 2018. Early adoption is permitted for annual reporting periods beginning after December 15, 2016. The Company is currently assessing the impact that ASU 2014-09 will have on the Company's financial statements and evaluating which adoption method to apply.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Sep. 30, 2015
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents The Company's cash and cash equivalents is summarized in the following table (dollars in millions): September 30, 2015 2014 Corporate $ 1,069 $ 298 Broker-dealer subsidiaries 721 1,090 Futures commission merchant subsidiary 72 — Trust company subsidiary 77 53 Investment advisory subsidiaries 39 19 Total $ 1,978 $ 1,460 Capital requirements may limit the amount of cash available for dividend from the broker-dealer, FCM and trust company subsidiaries to the parent company. Most of the trust company cash and cash equivalents arises from client transactions in the process of settlement, and therefore is generally not available for corporate purposes. Cash and cash equivalents of the investment advisory subsidiaries is generally not available for corporate purposes.

Cash and Investments Segregated

Cash and Investments Segregated and on Deposit for Regulatory Purposes	12 Months Ended
	Sep. 30, 2015
Restricted Cash and Investments [Abstract]
Cash and Investments Segregated and on Deposit for Regulatory Purposes	Cash and Investments Segregated and on Deposit for Regulatory Purposes Cash and investments segregated and on deposit for regulatory purposes consists of the following (dollars in millions): September 30, 2015 2014 U.S. government debt securities $ 3,706 $ 3,070 Reverse repurchase agreements (collateralized by U.S. government debt securities) 1,586 1,193 Cash in demand deposit accounts 802 617 Cash on deposit with futures commission merchants 136 186 U.S. government debt securities on deposit with futures commission merchant 75 50 Total $ 6,305 $ 5,116

Receivable from and Payable to

Receivable from and Payable to Brokers, Dealers and Clearing Organizations	12 Months Ended
	Sep. 30, 2015
Brokers and Dealers [Abstract]
Receivable from and Payable to Brokers, Dealers and Clearing Organizations	Receivable from and Payable to Brokers, Dealers and Clearing Organizations Amounts receivable from and payable to brokers, dealers and clearing organizations consist of the following (dollars in millions): September 30, 2015 2014 Receivable: Deposits paid for securities borrowed $ 664 $ 995 Broker-dealers 2 3 Clearing organizations 190 104 Securities failed to deliver 6 6 Total $ 862 $ 1,108 Payable: Deposits received for securities loaned $ 2,653 $ 2,384 Broker-dealers 1 3 Clearing organizations 19 23 Securities failed to receive 34 11 Total $ 2,707 $ 2,421

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts on Receivables	12 Months Ended
	Sep. 30, 2015
Valuation and Qualifying Accounts [Abstract]
Allowance for Doubtful Accounts on Receivables	Allowance for Doubtful Accounts on Receivables The following table summarizes activity in the Company's allowance for doubtful accounts on client and other receivables for the fiscal years indicated (dollars in millions): 2015 2014 2013 Beginning balance $ 10 $ 15 $ 21 Provision for (recovery of) doubtful accounts, net 6 3 (1 ) Write-off of doubtful accounts (4 ) (8 ) (5 ) Ending balance $ 12 $ 10 $ 15

Property and Equipment

Property and Equipment	12 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consists of the following (dollars in millions): September 30, 2015 2014 Buildings and building components $ 268 $ 264 Computer equipment 233 220 Software 188 170 Leasehold improvements 161 156 Land 20 20 Other property and equipment 76 72 946 902 Less: Accumulated depreciation and amortization (425 ) (359 ) Property and equipment at cost, net $ 521 $ 543

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	12 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets	Goodwill and Acquired Intangible Assets The Company has recorded goodwill for purchase business combinations to the extent the purchase price of each completed acquisition exceeded the fair value of the net identifiable tangible and intangible assets of each acquired company. There were no material changes in the carrying amount of goodwill during the fiscal years ended September 30, 2015 and 2014 . Acquired intangible assets consist of the following (dollars in millions): September 30, 2015 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Client relationships $ 1,228 $ (722 ) $ 506 $ 1,228 $ (645 ) $ 583 Technology and content 99 (90 ) 9 99 (77 ) 22 Trademark license 146 — 146 146 — 146 $ 1,473 $ (812 ) $ 661 $ 1,473 $ (722 ) $ 751 Amortization expense on acquired intangible assets was $90 million for each of fiscal years 2015 and 2014 and $91 million for fiscal year 2013 . Estimated future amortization expense for acquired intangible assets outstanding as of September 30, 2015 is as follows (dollars in millions): Fiscal Year Estimated Amortization Expense 2016 $ 85 2017 76 2018 72 2019 68 2020 63 Thereafter (to 2025) 151 Total $ 515

Notes Payable and Long-term Deb

Notes Payable and Long-term Debt	12 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Notes Payable and Long-term Debt	Notes Payable and Long-term Debt Notes payable and long-term debt consist of the following (dollars in millions): September 30, 2015 Face Value Unamortized Discounts and Debt Issuance Costs Fair Value Adjustment (1) Net Carrying Value Senior Notes: 5.600% Notes due 2019 $ 500 $ (2 ) $ 40 $ 538 2.950% Notes due 2022 750 (7 ) — 743 3.625% Notes due 2025 500 (4 ) 23 519 Total long-term debt $ 1,750 $ (13 ) $ 63 $ 1,800 September 30, 2014 Face Value Unamortized Discounts and Debt Issuance Costs Fair Value Adjustment (1) Net Carrying Value Notes payable: Parent Revolving Facility $ 150 $ — $ — $ 150 Long-term debt: Senior Notes: 4.150% Notes due 2014 500 — 2 502 5.600% Notes due 2019 500 (2 ) 30 528 Secured Loan: Variable-rate Note due 2019 69 — — 69 Subtotal - Long-term debt 1,069 (2 ) 32 1,099 Total notes payable and long-term debt $ 1,219 $ (2 ) $ 32 $ 1,249 (1) Fair value adjustments relate to changes in the fair value of the debt while in a fair value hedging relationship. See "Fair Value Hedging" below. Fiscal year maturities on long-term debt outstanding at September 30, 2015 are as follows (dollars in millions): 2016 $ — 2017 — 2018 — 2019 — 2020 500 Thereafter 1,250 Total $ 1,750 Senior Notes — The Company's unsecured, fixed-rate Senior Notes were each sold through a public offering and pay interest semi-annually in arrears. Key information about the Senior Notes is summarized in the following table (dollars in millions): Description Date Issued Maturity Date Aggregate Principal Interest Rate 2014 Notes November 25, 2009 December 1, 2014 $500 4.150% 2019 Notes November 25, 2009 December 1, 2019 $500 5.600% 2022 Notes March 4, 2015 April 1, 2022 $750 2.950% 2025 Notes October 17, 2014 April 1, 2025 $500 3.625% During fiscal 2015, the Company used the net proceeds from the issuance of the 2025 Notes, together with cash on hand, to repay in full the outstanding principal under the 2014 Notes. In addition, the Company issued the 2022 Notes for general corporate purposes, including liquidity for operational contingencies. The 2019 Notes are jointly and severally and fully and unconditionally guaranteed by each of the Company's current and future subsidiaries that is or becomes a borrower or a guarantor under the TD Ameritrade Holding Corporation Credit Agreement described below. Currently, the only subsidiary guarantor of the obligations under the 2019 Notes is TD Ameritrade Online Holdings Corp. ("TDAOH"). The Company's obligations in respect to the 2022 Notes and 2025 Notes are not guaranteed by any of its subsidiaries. The Company may redeem the 2019 Notes, in whole at any time or in part from time to time, at a redemption price equal to the greater of (a) 100% of the principal amount of the notes being redeemed, and (b) the sum of the present values of the remaining scheduled payments of principal and interest on the notes being redeemed, discounted to the date of redemption on a semi-annual basis at the comparable U.S. Treasury rate, plus 35 basis points, plus accrued and unpaid interest to the date of redemption. The Company may redeem the 2022 Notes and 2025 Notes, in whole or in part, at any time prior to February 1, 2022 and January 1, 2025 , respectively, at a redemption price equal to the greater of (a) 100% of the principal amount of the notes being redeemed, and (b) the sum of the present values of the remaining scheduled payments of principal and interest on the notes being redeemed, discounted to the date of redemption on a semi-annual basis at the comparable U.S. Treasury rate, plus 15 basis points in the case of the 2022 Notes and 25 basis points in the case of the 2025 Notes, plus, in each case, accrued and unpaid interest to the date of redemption. The Company may redeem the 2022 Notes and 2025 Notes, in whole or in part, at any time on or after February 1, 2022 and January 1, 2025 , respectively, at a redemption price equal to 100% of the principal amount of the notes being redeemed, plus, in each case, accrued and unpaid interest to the date of redemption. Secured Loan — On September 15, 2014, the Company entered into a bank loan agreement in the aggregate principal amount of $69 million , the proceeds of which were used to purchase real estate for use in the Company's operations. During fiscal 2015, the Company paid in full the outstanding principal balance of the loan. Fair Value Hedging — The Company is exposed to changes in the fair value of its fixed-rate Senior Notes resulting from interest rate fluctuations. To hedge a portion of this exposure, the Company has entered into fixed-for-variable interest rate swaps on the 2019 Notes and the 2025 Notes. Each fixed-for-variable interest rate swap has a notional amount of $500 million and a maturity date matching the maturity date of the respective Senior Notes. During December 2014, the Company paid in full the outstanding principal under the 2014 Notes and an interest rate swap on the 2014 Notes expired. The interest rate swaps effectively change the fixed-rate interest on the 2019 Notes and 2025 Notes to variable-rate interest. Under the terms of the interest rate swap agreements, the Company receives semi-annual fixed-rate interest payments based on the same rates applicable to the Senior Notes, and makes quarterly variable-rate interest payments based on three-month LIBOR plus (a) 2.3745% for the swap on the 2019 Notes and (b) 1.1022% for the swap on the 2025 Notes. As of September 30, 2015 , the weighted average effective interest rate on the aggregate principal balance of the 2019 Notes and 2025 Notes was 2.04% . The interest rate swaps are accounted for as fair value hedges and qualify for the shortcut method of accounting. Changes in the payment of interest resulting from the interest rate swaps are recorded in interest on borrowings on the Consolidated Statements of Income. Changes in fair value of the interest rate swaps are completely offset by changes in fair value of the related notes, resulting in no effect on net income. The following table summarizes gains and losses resulting from changes in the fair value of interest rate swaps designated as fair value hedges and the hedged fixed-rate debt for the fiscal years indicated (dollars in millions): 2015 2014 2013 Gain (loss) on fair value of interest rate swaps $ 31 $ (20 ) $ (44 ) Gain (loss) on fair value of hedged fixed-rate debt (31 ) 20 44 Net gain (loss) recorded in interest on borrowings $ — $ — $ — Cash Flow Hedging – On January 17, 2014 , the Company entered into forward-starting interest rate swap contracts with an aggregate notional amount of $500 million , to hedge against changes in the benchmark interest rate component of future interest payments resulting from the anticipated refinancing of the 2014 Notes. The Company designated the contracts as a cash flow hedge of the future interest payments. Under cash flow hedge accounting, until settlement the swap contracts are carried at fair value and, to the extent they are an effective hedge, any unrealized gains or losses are recorded in other comprehensive income (loss). Any ineffective portion of the unrealized gains or losses is immediately recorded into earnings. Upon settlement, any realized gain or loss that has been recorded in other comprehensive income (loss) is amortized into earnings over the term of the newly-issued fixed-rate debt. On October 17, 2014, the Company sold $500 million of 2025 Notes as described under "Senior Notes" above, and paid approximately $45 million to settle the forward-starting interest rate swap contracts. As of October 17, 2014, the Company recorded $0.5 million of pre-tax loss immediately into earnings to reflect ineffectiveness resulting from the issuance of the 2025 Notes slightly earlier than forecast. As of September 30, 2015, the Company expects to amortize $4.4 million of pre-tax losses, that were reported in accumulated other comprehensive loss, into interest on borrowings on the Consolidated Statements of Income within the next 12 months . The following table summarizes pre-tax losses resulting from changes in the fair value of the forward-starting interest rate swaps for the fiscal years indicated (dollars in millions): Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) 2015 2014 2013 Forward-starting interest rate swaps $ (15 ) $ (29 ) $ — Balance Sheet Impact of Hedging Instruments — The following table summarizes the fair value of outstanding derivatives designated as hedging instruments on the Consolidated Balance Sheets (dollars in millions): Balance Sheet Location September 30, 2015 2014 Interest rate contracts: Pay-variable interest rate swaps designated as fair value hedges Other assets $ 63 $ 32 Forward-starting interest rate swaps designated as cash flow hedges Accounts payable and other liabilities $ — $ (29 ) The interest rate swaps are subject to counterparty credit risk. Credit risk is managed by limiting activity to approved counterparties that meet a minimum credit rating threshold, by entering into credit support agreements, or by utilizing approved central clearing counterparties registered with the CFTC. The interest rate swaps require daily collateral coverage, in the form of cash or U.S. Treasury securities, for the aggregate fair value of the interest rate swaps (including accrued interest). As of September 30, 2015 and 2014 , the pay-variable interest rate swap counterparties had pledged $77 million and $47 million of collateral, respectively, to the Company in the form of cash. A liability for collateral pledged to the Company in the form of cash is recorded in accounts payable and other liabilities on the Consolidated Balance Sheets. As of September 30, 2014 the Company had pledged $43 million of collateral to the forward-starting interest rate swap counterparties in the form of cash. An asset for collateral pledged to the swap counterparties in the form of cash is recorded in other assets on the Consolidated Balance Sheets. TD Ameritrade Holding Corporation Credit Agreement — On June 11, 2014 , the Parent entered into a credit agreement consisting of a senior unsecured revolving credit facility in the aggregate principal amount of $300 million (the "Parent Revolving Facility"). The maturity date of the Parent Revolving Facility is June 11, 2019 . The applicable interest rate under the Parent Revolving Facility is calculated as a per annum rate equal to, at the option of the Parent, (a) LIBOR plus an interest rate margin ("Parent LIBOR loans") or (b) (i) the highest of (x) the prime rate, (y) the federal funds effective rate plus 0.50% or (z) one-month LIBOR plus 1.00% , plus (ii) an interest rate margin ("Base Rate loans"). The interest rate margin ranges from 0.875% to 1.75% for Parent LIBOR loans and from 0% to 0.75% for Base Rate loans, determined by reference to the Company's public debt ratings. The Parent is obligated to pay a commitment fee ranging from 0.10% to 0.25% on any unused amount of the Parent Revolving Facility, determined by reference to the Company's public debt ratings. As of September 30, 2015, the interest rate margin would have been 1.25% for Parent LIBOR loans and 0.25% for Base Rate loans, and the commitment fee was 0.15% , each determined by reference to the Company's public debt ratings. There were no borrowings outstanding under the Parent Revolving Facility as of September 30, 2015. As of September 30, 2014 , there was $150 million of borrowings outstanding under the Parent Revolving Facility, consisting of Parent LIBOR loans. As of September 30, 2014 , the commitment fee was 0.15% and the interest rate margin was 1.25% , each determined by reference to the Company's public debt ratings, and the interest rate was 1.40% , based on one-month LIBOR plus the interest rate margin. The obligations under the Parent Revolving Facility are guaranteed by TDAOH and each "significant subsidiary" (as defined in SEC Rule 1-02(w) of Regulation S-X) of the Parent, other than broker-dealer subsidiaries, FCM subsidiaries and controlled foreign corporations. Currently, the only subsidiary guarantor of the obligations under the Parent Revolving Facility is TDAOH. The Parent Revolving Facility contains negative covenants that limit or restrict, subject to certain exceptions, the incurrence of liens, indebtedness of subsidiaries, mergers, consolidations, transactions with affiliates, change in nature of business and the sale of all or substantially all of the assets of the Company. The Parent is also required to maintain compliance with a maximum consolidated leverage ratio covenant and a minimum consolidated interest coverage ratio covenant, and the Company's broker-dealer and FCM subsidiaries are required to maintain compliance with a minimum regulatory net capital covenant. The Company was in compliance with all covenants under the Parent Revolving Facility as of September 30, 2015 . TD Ameritrade Clearing, Inc. Credit Agreement — On June 11, 2014 , TD Ameritrade Clearing, Inc. ("TDAC"), the Company's clearing broker-dealer subsidiary, entered into a credit agreement consisting of a senior unsecured revolving credit facility in the aggregate principal amount of $300 million (the "TDAC Revolving Facility"). The maturity date of the TDAC Revolving Facility is June 11, 2019 . The applicable interest rate under the TDAC Revolving Facility is calculated as a per annum rate equal to, at the option of TDAC, (a) LIBOR plus an interest rate margin ("TDAC LIBOR loans") or (b) the federal funds effective rate plus an interest rate margin ("Fed Funds Rate loans"). The interest rate margin ranges from 0.75% to 1.50% for both TDAC LIBOR loans and Fed Funds Rate loans, determined by reference to the Company's public debt ratings. TDAC is obligated to pay a commitment fee ranging from 0.08% to 0.20% on any unused amount of the TDAC Revolving Facility, determined by reference to the Company's public debt ratings. As of September 30, 2015 , the interest rate margin would have been 1.00% for both TDAC LIBOR loans and Fed Funds Rate loans, and the commitment fee was 0.125% , each determined by reference to the Company's public debt ratings. There were no borrowings outstanding under the TDAC Revolving Facility as of September 30, 2015 and 2014 , respectively. The TDAC Revolving Facility contains negative covenants that limit or restrict, subject to certain exceptions, the incurrence of liens, indebtedness of TDAC, mergers, consolidations, change in nature of business and the sale of all or substantially all of the assets of TDAC. TDAC is also required to maintain minimum tangible net worth and is required to maintain compliance with minimum regulatory net capital requirements. TDAC was in compliance with all covenants under the TDAC Revolving Facility as of September 30, 2015 . Intercompany Credit Agreements — During March 2015, the Parent entered into credit agreements with each of its primary broker-dealer and FCM subsidiaries as described below. The intercompany credit agreement with TDAC was established on March 31, 2015 and will terminate on March 1, 2022 . Under this agreement, TDAC may borrow up to $700 million in cash or securities from the Parent under a committed facility. In addition, the Parent is permitted, but under no obligation, to make loans of up to $300 million in cash or securities to TDAC under an uncommitted facility. Loans under both the committed and uncommitted facilities bear interest at the same rate as borrowings under the TDAC Revolving Facility and must be repaid with interest on or before the termination date. The intercompany credit agreement with TD Ameritrade, Inc., the Company's introducing broker-dealer subsidiary, was established on March 31, 2015 and will terminate on March 1, 2022 . Under this agreement, TD Ameritrade, Inc. may borrow up to $50 million in cash or securities from the Parent under a committed facility. In addition, the Parent is permitted, but under no obligation, to make loans of up to $300 million in cash or securities to TD Ameritrade, Inc. under an uncommitted facility. Loans under both the committed and uncommitted facilities bear interest at the same rate as borrowings under the TDAC Revolving Facility and must be repaid with interest on or before the termination date. The intercompany credit agreement with TD Ameritrade Futures & Forex LLC ("TDAFF"), the Company's FCM subsidiary, was established on March 29, 2015 and has an initial term of five years. The agreement will automatically renew for an additional five -year term, unless either party provides notice to the other of its intent to terminate not less than 30 days before the end of the then current term. Under this agreement, TDAFF may borrow from the Parent, under a committed facility, up to 75% of TDAFF's "residual interest target" as determined by TDAFF in accordance with applicable rules and regulations. As of September 30, 2015, TDAFF's residual interest target was $18 million and the corresponding loan commitment amount was $13.5 million . Loans under this facility bear interest at the prime rate plus 1.00% and must be repaid with interest not later than 60 calendar days following the date of the borrowing. There were no borrowings outstanding under any of the intercompany credit agreements as of September 30, 2015.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Provision for income taxes is comprised of the following for the fiscal years indicated (dollars in millions): 2015 2014 2013 Current expense: Federal $ 470 $ 457 $ 370 State 28 53 33 498 510 403 Deferred expense (benefit): Federal (22 ) (28 ) (2 ) State (1 ) 1 12 (23 ) (27 ) 10 Provision for income taxes $ 475 $ 483 $ 413 A reconciliation of the federal statutory tax rate to the effective tax rate applicable to pre-tax income follows for the fiscal years indicated: 2015 2014 2013 Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal tax effect 3.0 3.1 2.6 Adjustments to estimated state income taxes 0.1 0.2 0.4 Interest recorded (reversed) on unrecognized tax benefits, net (0.1 ) 0.2 0.3 Reversal of accruals for unrecognized tax benefits (1.1 ) (0.5 ) (0.3 ) 36.9 % 38.0 % 38.0 % The Company's effective income tax rate for fiscal year 2015 was 36.9% , compared to 38.0% for fiscal years 2014 and 2013 . The provision for income taxes for fiscal year 2015 was lower than normal primarily due to $22 million of favorable resolutions of state income tax matters. This favorably impacted the Company's earnings for fiscal year 2015 by approximately four cents per share. The provision for income taxes for fiscal year 2014 included $10 million of favorable resolutions of state income tax matters, partially offset by $2 million of unfavorable deferred income tax adjustments resulting from state income tax law changes. These items had a net favorable impact on the Company's earnings for fiscal year 2014 of approximately one cent per share. The provision for income taxes for fiscal year 2013 included $6 million of favorable resolutions of state income tax matters, which was mostly offset by $4 million of unfavorable deferred income tax adjustments resulting from state income tax law changes. Deferred tax assets (liabilities) are comprised of the following (dollars in millions): September 30, 2015 2014 Deferred tax assets: Accrued and other liabilities $ 76 $ 78 Intangible assets, state tax benefit 7 10 Stock-based compensation 37 37 Allowance for doubtful accounts 5 5 Operating loss carryforwards 7 12 Unrecognized loss on cash flow hedging instruments 15 11 Other deferred tax assets 1 — Gross deferred tax assets 148 153 Less: Valuation allowance (4 ) (9 ) Net deferred tax assets 144 144 Deferred tax liabilities: Acquired intangible assets (387 ) (410 ) Property and equipment (39 ) (42 ) Other deferred tax liabilities (5 ) (6 ) Total deferred tax liabilities (431 ) (458 ) Net deferred tax liabilities $ (287 ) $ (314 ) As of September 30, 2015 , the Company has recorded a tax benefit for approximately $3 million of federal net operating loss carryover that was acquired as part of the thinkorswim Group Inc. acquisition in fiscal 2009. The net operating loss expires in 2019 , and is subject to substantial annual limitations on the utilization of the net operating loss. The amount of tax benefit recorded in the financial statements represents the amount that is more likely than not to be realized within the carryforward period. At September 30, 2015 , subsidiaries of the Company have approximately $83 million of separate state operating loss carryforwards. These carryforwards expire between fiscal 2016 and 2034 . Because the realization of the tax benefit from state loss carryforwards is dependent on certain subsidiaries generating sufficient state taxable income in future periods, as well as annual limitations on future utilization, the Company has provided a valuation allowance against the computed benefit in order to reflect the tax benefit expected to be realized. The $5 million decrease in the valuation allowance from September 30, 2014 to September 30, 2015 was primarily due to expiration of certain state net operating loss carryforwards during fiscal 2015 . A reconciliation of the activity related to unrecognized tax benefits follows for the fiscal years indicated (dollars in millions): 2015 2014 2013 Beginning balance $ 165 $ 137 $ 139 Additions based on tax positions related to the current year 16 29 8 Additions for tax positions of prior years 5 10 2 Reductions for tax positions of prior years (4 ) (1 ) (5 ) Reductions due to settlements with taxing authorities (21 ) — (1 ) Reductions due to lapsed statute of limitations (7 ) (10 ) (6 ) Ending balance $ 154 $ 165 $ 137 The balance of unrecognized tax benefits as of September 30, 2015 was $154 million ( $100 million net of the federal benefit on state matters), all of which, if recognized, would favorably affect the effective income tax rate in any future periods. The balance of unrecognized tax benefits as of September 30, 2014 was $165 million ( $107 million net of the federal benefit on state matters), all of which, if recognized, would favorably affect the effective income tax rate in any future periods. The Company's income tax returns are subject to review and examination by federal, state and local taxing authorities. The federal returns for 2012 through 2014 remain open under the statute of limitations. The years open to examination by state and local government authorities vary by jurisdiction, but the statute of limitations is generally three to four years from the date the tax return is filed. It is reasonably possible that the gross unrecognized tax benefits as of September 30, 2015 could decrease by up to $41 million ( $27 million net of the federal benefit on state matters) within the next twelve months as a result of settlements of certain examinations or expiration of the statute of limitations with respect to other tax filings. The Company recognized $2 million of net benefits for interest and penalties (net of the federal income tax effect) on the Consolidated Statement of Income for fiscal year 2015, primarily due to favorable resolutions of uncertain tax positions. The Company recognized interest and penalties expense (net of the federal benefit) of $3 million and $2 million for fiscal years 2014 and 2013 , respectively. As of September 30, 2015 and 2014 , accrued interest and penalties related to unrecognized tax benefits was $49 million and $53 million , respectively.

Capital Requirements

Capital Requirements	12 Months Ended
	Sep. 30, 2015
Regulatory Capital Requirements [Abstract]
Capital Requirements	Capital Requirements The Company's broker-dealer subsidiaries are subject to the SEC Uniform Net Capital Rule (Rule 15c3-1 under the Exchange Act), administered by the SEC and FINRA, which requires the maintenance of minimum net capital, as defined. Net capital and the related net capital requirement may fluctuate on a daily basis. TDAC, the Company's clearing broker-dealer subsidiary, and TD Ameritrade, Inc., the Company's introducing broker-dealer subsidiary, compute net capital under the alternative method as permitted by Rule 15c3-1. TDAC is required to maintain minimum net capital of the greater of $1.5 million , which is based on the type of business conducted by the broker-dealer, or 2% of aggregate debit balances arising from client transactions. Under Rule 15c3-1, TD Ameritrade, Inc. is required to maintain minimum net capital of the greater of $250,000 or 2% of aggregate debit balances. Prior to May 20, 2015, as an FCM registered with the CFTC, TD Ameritrade, Inc. was also subject to CFTC Regulation 1.17 under the Commodity Exchange Act, administered by the CFTC and the NFA, which requires the maintenance of minimum net capital of the greatest of (a) $1.0 million , (b) its futures risk-based capital requirement, equal to 8% of the total risk margin requirement for all futures positions carried by the FCM in client and nonclient accounts, or (c) its Rule 15c3-1 net capital requirement. TD Ameritrade, Inc. transferred its futures and foreign exchange business to TDAFF effective March 29, 2015 and withdrew its registration as an FCM effective May 20, 2015. Under the alternative method, a broker-dealer may not repay any subordinated borrowings, pay cash dividends or make any unsecured advances or loans to its parent company or employees if such payment would result in a net capital amount of (a) less than 5% of aggregate debit balances, (b) less than 110% of its risk-based capital requirement under CFTC Regulation 1.17, or (c) less than 120% of its minimum dollar requirement. An FCM, such as TDAFF, that is not registered as a securities broker-dealer must provide notice to the CFTC if its net capital amounts to less than (a) 110% of its risk-based capital requirement under CFTC Regulation 1.17 or (b) less than 150% of its minimum dollar requirement. These broker-dealer and FCM net capital thresholds, which are specified in Exchange Act Rule 17a-11 and CFTC Regulation 1.12, are typically referred to as "early warning" net capital thresholds. Net capital and net capital requirements for the Company's broker-dealer subsidiaries are summarized in the following tables (dollars in millions): TD Ameritrade Clearing, Inc. Date Net Capital Required Net Capital (2% of Aggregate Debit Balances) Net Capital in Excess of Required Net Capital Net Capital in Excess of Early Warning Threshold (5% of Aggregate Debit Balances) Ratio of Net Capital to Aggregate Debit Balances September 30, 2015 $ 1,581 $ 310 $ 1,271 $ 807 10.22 % September 30, 2014 $ 1,569 $ 280 $ 1,289 $ 868 11.19 % TD Ameritrade, Inc. Date Net Capital Required Net Capital (8% of Total Risk Margin or $250,000 Minimum Dollar Requirement) Net Capital in Excess of Required Net Capital Net Capital in Excess of Early Warning Threshold (110% or 120% of Required Net Capital) September 30, 2015 $ 228 $ — $ 228 $ 227 September 30, 2014 $ 347 $ 17 $ 330 $ 328 During October 2014, TDAFF registered as an FCM with the CFTC. TDAFF is subject to CFTC Regulation 1.17 under the Commodity Exchange Act, which requires the maintenance of minimum net capital as described above. Net capital and net capital requirements for TDAFF are summarized in the following table (dollars in millions): TD Ameritrade Futures & Forex LLC Date Net Capital Required Net Capital (8% of Total Risk Margin) Net Capital in Excess of Required Net Capital Net Capital in Excess of Early Warning Threshold (110% of Required Net Capital) September 30, 2015 $ 90 $ 12 $ 78 $ 78 September 30, 2014 N/A N/A N/A N/A The Company's non-depository trust company subsidiary, TD Ameritrade Trust Company ("TDATC"), is subject to capital requirements established by the State of Maine, which require TDATC to maintain minimum Tier 1 capital, as defined. TDATC's Tier 1 capital was $32 million and $27 million as of September 30, 2015 and 2014 , respectively, which exceeded the required Tier 1 capital by $17 million and $12 million , respectively.

Stock-based Compensation

Stock-based Compensation	12 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	Stock-based Compensation The Company has two stock incentive plans under which Company stock-based awards may be granted: the TD Ameritrade Holding Corporation Long-Term Incentive Plan (the "LTIP") and the 2006 Directors Incentive Plan (the "Directors Plan"). The Company also assumed stock incentive plans in connection with past business combinations. New stock awards can no longer be granted under the assumed plans. The LTIP authorizes the award of options to purchase common stock, common stock appreciation rights, restricted stock, restricted stock units, performance shares and performance units. Under the LTIP, 42,104,174 shares of the Company's common stock are reserved for issuance to eligible employees, consultants and non-employee directors. The Directors Plan authorizes the award of options to purchase common stock, common stock appreciation rights, restricted stock units and restricted stock. Under the Directors Plan, 1,830,793 shares of the Company's common stock are reserved for issuance to non-employee directors. Stock options, except for replacement options granted in connection with business combinations, are granted by the Company with an exercise price not less than the fair market value of the Company's common stock on the grant date. Stock options generally vest over a one - to four -year period and expire 10 years after the grant date. Restricted Stock Units ("RSUs") are awards that entitle the holder to receive shares of Company common stock following a vesting period. RSUs granted to employees generally vest after the completion of a three -year period. RSUs granted to non-employee directors generally vest over a one -year period. Stock-based compensation expense was $36 million , $32 million and $29 million for fiscal years 2015 , 2014 and 2013 , respectively. The related income tax benefits were $14 million , $12 million and $11 million for fiscal years 2015 , 2014 and 2013 , respectively. The following is a summary of option activity in the Company's stock incentive plans for the fiscal year ended September 30, 2015 : Number of Options (in thousands) Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in millions) Outstanding at beginning of year 2,136 $ 18.43 Exercised (849 ) $ 17.98 Expired (1 ) $ 37.08 Outstanding at end of year 1,286 $ 18.71 2.7 $ 17 Exercisable at end of year 1,286 $ 18.71 2.7 $ 17 The Company measures the fair value of stock options using a Black-Scholes valuation model as of the date of grant. No options were granted during fiscal years 2015 , 2014 and 2013 . The total intrinsic value of options exercised during fiscal years 2015 , 2014 and 2013 was $11 million , $6 million and $65 million , respectively. As of September 30, 2015 , there was no unrecognized compensation cost related to nonvested stock option awards. The Company measures the fair value of RSUs based upon the volume-weighted average market price of the underlying common stock as of the date of grant. RSUs are amortized over their applicable vesting period using the straight-line method, reduced by expected forfeitures. The following is a summary of RSU activity in the Company's stock incentive plans for the fiscal year ended September 30, 2015 : Number of Units (in thousands) Weighted Average Grant Date Fair Value Nonvested at beginning of year 4,832 $ 19.57 Granted 1,207 $ 34.34 Dividend equivalents 70 $ 23.18 Vested (1,787 ) $ 17.02 Forfeited (110 ) $ 25.28 Nonvested at end of year 4,212 $ 24.79 As of September 30, 2015 , there was $31 million of estimated unrecognized compensation cost related to nonvested RSUs, which was expected to be recognized over a weighted average period of 1.9 years. The total fair value of restricted stock units that vested during fiscal years 2015, 2014 and 2013 was $59 million , $48 million and $15 million , respectively. Although the Company does not have a formal policy regarding issuance of shares for stock-based compensation, such shares are generally issued from treasury stock. The stockholders agreement entered into in connection with the acquisition of TD Waterhouse requires the Company to repurchase its common stock from time to time to offset dilution resulting from stock option exercises and other stock awards subsequent to the acquisition. As of September 30, 2015 , the Company was not obligated to repurchase additional shares pursuant to the stockholders agreement. The Company cannot estimate the amount and timing of repurchases that may be required as a result of future stock issuances.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has a 401(k) and profit-sharing plan under which annual profit-sharing contributions are determined at the discretion of the board of directors. The Company also makes matching contributions pursuant to the plan document. Profit-sharing and matching contributions expense was $34 million , $30 million and $28 million for fiscal years 2015 , 2014 and 2013 , respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Commitments — The Company has various non-cancelable operating leases on facilities requiring annual payments as follows (dollars in millions): Fiscal Year Minimum Lease Payments Sublease Income Net Lease Commitments 2016 $ 54 $ (2 ) $ 52 2017 54 (2 ) 52 2018 52 (1 ) 51 2019 49 (1 ) 48 2020 39 — 39 Thereafter (to 2030) 70 — 70 Total $ 318 $ (6 ) $ 312 A majority of the leases for the Company's branch offices contain provisions for renewal at the Company's option. Rental expense, net of sublease income, was approximately $49 million for each of fiscal years 2015 and 2014 , and $54 million for fiscal year 2013 . Order Routing Matters — Five putative class action complaints have been filed regarding TD Ameritrade's routing of client orders. The cases are pending in the U.S. District Court for the District of Nebraska: Jay Zola et al. v. TD Ameritrade, Inc., et al. ; Tyler Verdieck v. TD Ameritrade, Inc. ; Bruce Lerner v. TD Ameritrade, Inc. ; Michael Sarbacker v. TD Ameritrade Holding Corporation, et al.; Gerald Klein v. TD Ameritrade Holding Corporation, et al. The complaints in Zola, Klein and Sarbacker allege that the defendants failed to provide clients with "best execution" and routed orders to the market venue that paid the most for its order flow. The complaints in Verdieck and Lerner allege that the defendant routed its clients' non-marketable limit orders to the venue paying the highest rates of maker rebates, and that clients did not receive best execution on these kinds of orders. The complaints variously include claims of breach of contract, breach of fiduciary duty, breach of the duty of best execution, fraud, negligent misrepresentation, violation s of Section 10(b) and 20 of the Exchange Act and SEC Rule 10b-5, violation of Nebraska's Consumer Protection Act, violation of Nebraska's Uniform Deceptive Trade Practices Act, aiding and abetting, unjust enrichment and declaratory judgment. The complaints seek various kinds of relief including damages, restitution, disgorgement, injunctive relief, equitable relief and other relief. The Company intends to vigorously defend against these lawsuits. The Company moved to dismiss each of the five putative class action complaints. The Magistrate Judge subsequently entered Findings and Recommendations with respect to each of the five actions, recommending that the District Judge dismiss each of the five lawsuits. The Plaintiffs have objected to the Magistrate Judge’s Findings and Recommendations. The Company is unable to predict the outcome or the timing of the ultimate resolution of these lawsuits, or the potential losses, if any, that may result. Certain regulatory authorities are conducting examinations and investigations regarding the routing of client orders. TD Ameritrade, Inc. and TDAC have received requests for documents and information from the regulatory authorities. TD Ameritrade, Inc. and TDAC are cooperating with the requests. Reserve Yield Plus Fund Litigation - During September 2008, The Reserve, an independent mutual fund company, announced that the net asset value of the Reserve Yield Plus Fund declined below $1.00 per share. The Yield Plus Fund was not a money market mutual fund, but its stated objective was to maintain a net asset value of $1.00 per share. TD Ameritrade, Inc.’s clients continue to hold shares in the Yield Plus Fund (now known as "Yield Plus Fund - In Liquidation"), which is being liquidated. In November 2008, a purported class action lawsuit was filed with respect to the Yield Plus Fund. The lawsuit is captioned Ross v. Reserve Management Company, Inc. et al. and is pending in the U.S. District Court for the Southern District of New York. The Ross lawsuit is on behalf of persons who purchased shares of Reserve Yield Plus Fund. On November 20, 2009, the plaintiffs filed a first amended complaint naming as defendants the fund’s advisor, certain of its affiliates and the Company and certain of its directors, officers and shareholders as alleged control persons. The complaint alleges claims of violations of the federal securities laws and other claims based on allegations that false and misleading statements and omissions were made in the Reserve Yield Plus Fund prospectuses and in other statements regarding the fund. On March 19, 2015, the plaintiffs entered into an agreement with Reserve Management Company, Inc. and related defendants to settle the claims against them, subject to court approval. On March 26, 2015, the Company and the plaintiffs reached an agreement in principle to resolve the claims against the Company and its directors, officers and shareholders named as defendants, subject to definitive written terms that will require court approval. Under the agreement, the Company will make a cash contribution of $3.75 million toward a class settlement fund. All the parties entered into a stipulation of settlement as of June 4, 2015, subject to court approval, and filed a request for the Court’s preliminary approval of the settlement and approval of notices to class members. Other Legal and Regulatory Matters — The Company is subject to a number of other lawsuits, arbitrations, claims and other legal proceedings in connection with its business. Some of these legal actions include claims for substantial or unspecified compensatory and/or punitive damages. In addition, in the normal course of business, the Company discusses matters with its regulators raised during regulatory examinations or otherwise subject to their inquiry. These matters could result in censures, fines, penalties or other sanctions. ASC 450, Loss Contingencies , governs the recognition and disclosure of loss contingencies, including potential losses from legal and regulatory matters. ASC 450 categorizes loss contingencies using three terms based on the likelihood of occurrence of events that result in a loss: "probable" means that "the future event or events are likely to occur;" "remote" means that "the chance of the future event or events occurring is slight;" and "reasonably possible" means that "the chance of the future event or events occurring is more than remote but less than likely." Under ASC 450, the Company accrues for losses that are considered both probable and reasonably estimable. The Company may incur losses in addition to the amounts accrued where the losses are greater than estimated by management, or for matters for which an unfavorable outcome is considered reasonably possible, but not probable. The Company estimates that the aggregate range of reasonably possible losses in excess of amounts accrued is from $0 to $50 million as of September 30, 2015 . This estimated aggregate range of reasonably possible losses is based upon currently available information for those legal and regulatory matters in which the Company is involved, taking into account the Company's best estimate of reasonably possible losses for those cases as to which an estimate can be made. For certain cases, the Company does not believe an estimate can currently be made, as some cases are in preliminary stages and some cases have no specific amounts claimed. The Company's estimate involves significant judgment, given the varying stages of the proceedings and the inherent uncertainty of predicting outcomes. The estimated range will change from time to time as the underlying matters, stages of proceedings and available information change. Actual losses may vary significantly from the current estimated range. The Company believes, based on its current knowledge and after consultation with counsel, that the ultimate disposition of these legal and regulatory matters, individually or in the aggregate, is not likely to have a material adverse effect on the financial condition or cash flows of the Company. However, in light of the uncertainties involved in such matters, the Company is unable to predict the outcome or the timing of the ultimate resolution of these matters, or the potential losses, fines, penalties or equitable relief, if any, that may result, and it is possible that the ultimate resolution of one or more of these matters may be material to the Company's results of operations for a particular reporting period. Income Taxes — The Company's federal and state income tax returns are subject to examination by taxing authorities. Because the application of tax laws and regulations to many types of transactions is subject to varying interpretations, amounts reported in the consolidated financial statements could be significantly changed at a later date upon final determinations by taxing authorities. TD has agreed to indemnify the Company for tax obligations, if any, pertaining to activities of TD Waterhouse Group, Inc. ("TD Waterhouse") prior to the Company's acquisition of TD Waterhouse in January 2006. General Contingencies — In the ordinary course of business, there are various contingencies that are not reflected in the consolidated financial statements. These include the Company's broker-dealer and FCM subsidiaries' client activities involving the execution, settlement and financing of various client securities, options, futures and foreign exchange transactions. These activities may expose the Company to credit risk in the event the clients are unable to fulfill their contractual obligations. The Company extends margin credit and leverage to its clients. In margin transactions, the Company extends credit to the client, subject to various regulatory and internal margin requirements, collateralized by cash and securities in the client's account. In connection with these activities, the Company also executes and clears client transactions involving the sale of securities not yet purchased ("short sales"). Such margin-related transactions may expose the Company to credit risk in the event a client's assets are not sufficient to fully cover losses that the client may incur. Leverage involves securing a large potential future obligation with a lesser amount of collateral. The risks associated with margin credit and leverage increase during periods of rapid market movements, or in cases where leverage or collateral is concentrated and market movements occur. In the event the client fails to satisfy its obligations, the Company has the authority to liquidate certain positions in the client's account at prevailing market prices in order to fulfill the client's obligations. However, during periods of rapid market movements, clients who utilize margin credit or leverage and who have collateralized their obligations with securities may find that the securities have a rapidly depreciating value and may not be sufficient to cover their obligations in the event of liquidation. The Company seeks to mitigate the risks associated with its client margin and leverage activities by requiring clients to maintain margin collateral in compliance with various regulatory and internal guidelines. The Company monitors required margin levels throughout each trading day and, pursuant to such guidelines, requires clients to deposit additional collateral, or to reduce positions, when necessary. The Company contracts with unaffiliated FCM and broker-dealer entities to clear and execute futures and foreign exchange transactions for its clients. This can result in concentrations of credit risk with one or more of these counterparties. This risk is partially mitigated by the counterparties' obligation to comply with rules and regulations governing FCMs and broker-dealers in the United States. These rules generally require maintenance of net capital and segregation of client funds and securities from holdings of the clearing FCMs and broker-dealers. In addition, the Company manages this risk by requiring credit approvals for counterparties and by utilizing account funding and sweep arrangement agreements that generally specify that all client cash in excess of futures funding requirements be transferred back to the client’s securities brokerage account at the Company on a daily basis. The Company loans securities temporarily to other broker-dealers in connection with its broker-dealer business. The Company receives cash as collateral for the securities loaned. Increases in securities prices may cause the market value of the securities loaned to exceed the amount of cash received as collateral. In the event the counterparty to these transactions does not return the loaned securities, the Company may be exposed to the risk of acquiring the securities at prevailing market prices in order to satisfy its client obligations. The Company mitigates this risk by requiring credit approvals for counterparties, by monitoring the market value of securities loaned on a daily basis and requiring additional cash as collateral when necessary, and by participating in a risk-sharing program offered through the Options Clearing Corporation ("OCC"). The Company borrows securities temporarily from other broker-dealers in connection with its broker-dealer business. The Company deposits cash as collateral for the securities borrowed. Decreases in securities prices may cause the market value of the securities borrowed to fall below the amount of cash deposited as collateral. In the event the counterparty to these transactions does not return the cash deposited, the Company may be exposed to the risk of selling the securities at prevailing market prices. The Company mitigates this risk by requiring credit approvals for counterparties, by monitoring the collateral values on a daily basis and requiring collateral to be returned by the counterparties when necessary, and by participating in a risk-sharing program offered through the OCC. The Company transacts in reverse repurchase agreements (securities purchased under agreements to resell) in connection with its broker-dealer business. The Company's policy is to take possession or control of securities with a market value in excess of the principal amount loaned, plus accrued interest, in order to collateralize resale agreements. The Company monitors the market value of the underlying securities that collateralize the related receivable on resale agreements on a daily basis and may require additional collateral when deemed appropriate. The Company has accepted collateral in connection with client margin loans and securities borrowed. Under applicable agreements, the Company is generally permitted to repledge securities held as collateral and use them to enter into securities lending arrangements. The following table summarizes the fair values of client margin securities and stock borrowings that were available to the Company to utilize as collateral on various borrowings or for other purposes, and the amount of that collateral loaned or repledged by the Company (dollars in billions): September 30, 2015 2014 Client margin securities $ 17.7 $ 16.2 Stock borrowings 0.7 1.0 Total collateral available $ 18.4 $ 17.2 Collateral loaned $ 2.7 $ 2.4 Collateral repledged 3.8 2.5 Total collateral loaned or repledged $ 6.5 $ 4.9 The Company is subject to cash deposit and collateral requirements with clearinghouses based on its clients' trading activity. The following table summarizes cash deposited with and securities pledged to clearinghouses by the Company (dollars in millions): September 30, Assets Balance Sheet Classification 2015 2014 Cash Receivable from brokers, dealers and clearing organizations $ 190 $ 104 U.S. government debt securities Securities owned, at fair value 350 181 Total $ 540 $ 285 Guarantees — The Company is a member of and provides guarantees to securities clearinghouses and exchanges in connection with client trading activities. Under related agreements, the Company is generally required to guarantee the performance of other members. Under these agreements, if a member becomes unable to satisfy its obligations to the clearinghouse, other members would be required to meet shortfalls. The Company's liability under these arrangements is not quantifiable and could exceed the cash and securities it has posted to the clearinghouse as collateral. However, the potential for the Company to be required to make payments under these agreements is considered remote. Accordingly, no contingent liability is carried on the Consolidated Balance Sheets for these guarantees. The Company clears its clients' futures transactions on an omnibus account basis through unaffiliated clearing firms. The Company also contracts with an external provider to facilitate foreign exchange trading for its clients. The Company has agreed to indemnify these unaffiliated clearing firms and the external provider for any loss that they may incur for the client transactions introduced to them by the Company. See "Insured Deposit Account Agreement" in Note 18 for a description of a guarantee included in that agreement.

Fair Value Disclosures

Fair Value Disclosures	12 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures Fair Value Measurement — Definition and Hierarchy ASC 820-10, Fair Value Measurement , defines fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. ASC 820-10 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability, developed based on market data obtained from sources independent of the Company. Unobservable inputs reflect the Company's own assumptions about the assumptions market participants would use in pricing the asset or liability, developed based on the best information available in the circumstances. The fair value hierarchy prioritizes the inputs to valuation techniques used to measure fair value into three broad levels, as follows: • Level 1 — Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. This category includes active exchange-traded funds, money market mutual funds, mutual funds and equity securities. • Level 2 — Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Such inputs include quoted prices in markets that are not active, quoted prices for similar assets and liabilities in active and inactive markets, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means. This category includes most debt securities and other interest-sensitive financial instruments. • Level 3 — Unobservable inputs for the asset or liability, where there is little, if any, observable market activity or data for the asset or liability. The following tables present the Company's fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of September 30, 2015 and 2014 (dollars in millions): As of September 30, 2015 Level 1 Level 2 Level 3 Fair Value Assets: Cash equivalents: Money market mutual funds $ 1,888 $ — $ — $ 1,888 Investments segregated for regulatory purposes: U.S. government debt securities — 3,781 — 3,781 Securities owned: Money market and other mutual funds — — 2 2 U.S. government debt securities — 415 — 415 Other 3 5 — 8 Subtotal - Securities owned 3 420 2 425 Other assets: Pay-variable interest rate swaps (1) — 63 — 63 U.S. government debt securities — 4 — 4 Auction rate securities — — 1 1 Subtotal - Other assets — 67 1 68 Total assets at fair value $ 1,891 $ 4,268 $ 3 $ 6,162 Liabilities: Accounts payable and other liabilities: Securities sold, not yet purchased: Equity securities $ 23 $ — $ — $ 23 (1) See " Fair Value Hedging " in Note 8 for details. As of September 30, 2014 Level 1 Level 2 Level 3 Fair Value Assets: Cash equivalents: Money market mutual funds $ 1,284 $ — $ — $ 1,284 Investments segregated for regulatory purposes: U.S. government debt securities — 3,120 — 3,120 Securities owned: Money market and other mutual funds — — 1 1 U.S. government debt securities — 326 — 326 Other 2 3 — 5 Subtotal - Securities owned 2 329 1 332 Other assets: Pay-variable interest rate swaps (1) — 32 — 32 U.S. government debt securities — 4 — 4 Auction rate securities — — 1 1 Subtotal - Other assets — 36 1 37 Total assets at fair value $ 1,286 $ 3,485 $ 2 $ 4,773 Liabilities: Accounts payable and other liabilities: Forward-starting interest rate swaps (2) $ — $ 29 $ — $ 29 Securities sold, not yet purchased: Equity securities 1 — — 1 Total liabilities at fair value $ 1 $ 29 $ — $ 30 (1) See " Fair Value Hedging " in Note 8 for details. (2) See " Cash Flow Hedging " in Note 8 for details. There were no transfers between any levels of the fair value hierarchy during the periods covered by this report. Valuation Techniques In general, and where applicable, the Company uses quoted prices in active markets for identical assets or liabilities to determine fair value. This pricing methodology applies to the Company's Level 1 assets and liabilities. If quoted prices in active markets for identical assets and liabilities are not available to determine fair value, then the Company uses quoted prices for similar assets and liabilities or inputs other than the quoted prices that are observable, either directly or indirectly. This pricing methodology applies to the Company's Level 2 assets and liabilities. Level 2 Measurements: Debt Securities — Fair values for debt securities are based on prices obtained from an independent pricing vendor. The primary inputs to the valuation include quoted prices for similar assets in active markets, quoted prices for identical or similar assets in markets that are not active, contractual cash flows, benchmark yields and credit spreads. The Company validates the vendor pricing by periodically comparing it to pricing from another independent pricing service. The Company has not adjusted prices obtained from the independent pricing vendor for any periods presented in the Consolidated Financial Statements because no significant pricing differences have been observed. Interest Rate Swaps — These derivatives are valued by the Company using a valuation model provided by a third party service that incorporates interest rate yield curves, which are observable for substantially the full term of the contract. The valuation model is widely accepted in the financial services industry and does not involve significant judgment because most of the inputs are observable in the marketplace. Credit risk is not an input to the valuation because in each case the Company or counterparty has possession of collateral, in the form of cash or U.S. Treasury securities, in amounts equal to or exceeding the fair value of the interest rate swaps. The Company validates the third party service valuations by comparing them to valuation models provided by the swap counterparties. Level 3 Measurements: The Company has no material assets or liabilities classified as Level 3 of the fair value hierarchy. Fair Value of Financial Instruments Not Recorded at Fair Value Cash and cash equivalents, receivable from/payable to brokers, dealers and clearing organizations, receivable from/payable to clients, receivable from/payable to affiliates, other receivables, accounts payable and other liabilities and notes payable are short-term in nature and accordingly are carried at amounts that approximate fair value. Cash and cash equivalents include cash and highly-liquid investments with an original maturity of three months or less (categorized as Level 1 of the fair value hierarchy). Receivable from/payable to brokers, dealers and clearing organizations, receivable from/payable to clients, receivable from/payable to affiliates, other receivables, accounts payable and other liabilities and notes payable are recorded at or near their respective transaction prices and historically have been settled or converted to cash at approximately that value (categorized as Level 2 of the fair value hierarchy). Cash and investments segregated and on deposit for regulatory purposes includes reverse repurchase agreements (securities purchased under agreements to resell). Reverse repurchase agreements are treated as collateralized financing transactions and are carried at amounts at which the securities will subsequently be resold, plus accrued interest. The Company's reverse repurchase agreements generally have a maturity of seven days and are collateralized by U.S. Treasury securities in amounts exceeding the carrying value of the resale agreements. Accordingly, the carrying value of reverse repurchase agreements approximates fair value (categorized as Level 2 of the fair value hierarchy). In addition, this category includes cash held in demand deposit accounts and on deposit with futures commission merchants, for which the carrying values approximate the fair value (categorized as Level 1 of the fair value hierarchy). See Note 3 for a summary of cash and investments segregated and on deposit for regulatory purposes. Long-term debt — As of September 30, 2015 , the Company's Senior Notes had an aggregate estimated fair value, based on quoted market prices (categorized as Level 1 of the fair value hierarchy), of approximately $1.833 billion , compared to the aggregate carrying value of the Senior Notes on the Consolidated Balance Sheet of $1.800 billion . As of September 30, 2014 , the Company's Senior Notes had an aggregate estimated fair value, based on quoted market prices, of approximately $1.081 billion , compared to the aggregate carrying value of the Senior Notes on the Consolidated Balance Sheet of $1.030 billion . As of September 30, 2014 , the $69 million carrying value of the Company's variable-rate secured loan approximates fair value because of the frequent repricing of the loan based on market interest rates (categorized as Level 2 of the fair value hierarchy).

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	12 Months Ended
	Sep. 30, 2015
Offsetting [Abstract]
Offsetting Assets and Liabilities	Offsetting Assets and Liabilities Substantially all of the Company's reverse repurchase agreements, securities borrowing and securities lending activity and derivative financial instruments are transacted under master agreements that may allow for net settlement in the ordinary course of business, as well as offsetting of all contracts with a given counterparty in the event of default by one of the parties. However, for financial statement purposes, the Company does not net balances related to these financial instruments. The following tables present information about the potential effect of rights of setoff associated with the Company's recognized assets and liabilities as of September 30, 2015 and 2014 (dollars in millions): September 30, 2015 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts of Recognized Assets and Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts Presented in the Consolidated Balance Sheet Financial Instruments (4) Collateral Received or Pledged (Including Cash) (5) Net Amount (6) Assets: Investments segregated for regulatory purposes: Reverse repurchase agreements $ 1,586 $ — $ 1,586 $ — $ (1,586 ) $ — Receivable from brokers, dealers and clearing organizations: Deposits paid for securities borrowed (1) 664 — 664 (70 ) (585 ) 9 Other assets: Pay-variable interest rate swaps 63 — 63 — (63 ) — Total $ 2,313 $ — $ 2,313 $ (70 ) $ (2,234 ) $ 9 Liabilities: Payable to brokers, dealers and clearing organizations: Deposits received for securities loaned (2)(3) $ 2,653 $ — $ 2,653 $ (70 ) $ (2,364 ) $ 219 September 30, 2014 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts of Recognized Assets and Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts Presented in the Consolidated Balance Sheet Financial Instruments (4) Collateral Received or Pledged (Including Cash) (5) Net Amount (6) Assets: Investments segregated for regulatory purposes: Reverse repurchase agreements $ 1,193 $ — $ 1,193 $ — $ (1,193 ) $ — Receivable from brokers, dealers and clearing organizations: Deposits paid for securities borrowed (1) 995 — 995 (69 ) (900 ) 26 Other assets: Pay-variable interest rate swaps 32 — 32 — (32 ) — Total $ 2,220 $ — $ 2,220 $ (69 ) $ (2,125 ) $ 26 Liabilities: Payable to brokers, dealers and clearing organizations: Deposits received for securities loaned (2) $ 2,384 $ — $ 2,384 $ (69 ) $ (2,015 ) $ 300 Accounts payable and other liabilities: Forward-starting interest rate swaps 29 — 29 — (29 ) — Total $ 2,413 $ — $ 2,413 $ (69 ) $ (2,044 ) $ 300 (1) Included in the gross amounts of deposits paid for securities borrowed is $332 million and $616 million as of September 30, 2015 and 2014 , respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of cash to the Company. See "General Contingencies" in Note 13 for a discussion of the potential risks associated with securities borrowing transactions and how the Company mitigates those risks. (2) Included in the gross amounts of deposits received for securities loaned is $1,164 million and $754 million as of September 30, 2015 and 2014 , respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of securities to the Company. See "General Contingencies" in Note 13 for a discussion of the potential risks associated with securities lending transactions and how the Company mitigates those risks. (3) Substantially all of the Company's securities lending transactions have a continuous contractual term and, upon notice by either party, may be terminated within three business days. The following table summarizes the Company's gross liability for securities lending transactions by the class of securities loaned (dollars in millions): September 30, 2015 Deposits received for securities loaned: Equity securities $ 2,413 Exchange-traded funds 150 Closed-end funds 41 Other 49 Total $ 2,653 (4) Amounts represent recognized assets and liabilities that are subject to enforceable master agreements with rights of setoff. (5) Represents the fair value of collateral the Company had received or pledged under enforceable master agreements, limited for table presentation purposes to the net amount of the recognized assets due from or liabilities due to each counterparty. At September 30, 2015 and 2014 , the Company had received total collateral with a fair value of $2,350 million and $2,231 million , respectively, and pledged total collateral with a fair value of $2,437 million and $2,124 million , respectively. (6) Represents the amount for which, in the case of net recognized assets, the Company had not received collateral, and in the case of net recognized liabilities, the Company had not pledged collateral.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Loss The following table presents the net change in fair value recorded for each component of other comprehensive loss before and after income tax for the fiscal years indicated (dollars in millions): 2015 2014 2013 Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Investments available-for-sale: Net unrealized gain $ — $ — $ — $ — $ — $ — $ 21 $ (8 ) $ 13 Reclassification adjustment for net realized gain included in net income (1) — — — — — — (52 ) 19 (33 ) Reclassification of impairment charge (1) — — — — — — 3 (1 ) 2 Change in net unrealized gain — — — — — — (28 ) 10 (18 ) Cash flow hedging instruments: Net unrealized loss (15 ) 5 (10 ) (29 ) 11 (18 ) — — — Reclassification adjustment for portion of realized loss amortized to net income (2) 4 (1 ) 3 — — — — — — Change in net unrealized loss (11 ) 4 (7 ) (29 ) 11 (18 ) — — — Other comprehensive loss $ (11 ) $ 4 $ (7 ) $ (29 ) $ 11 $ (18 ) $ (28 ) $ 10 $ (18 ) (1) The before tax reclassification amounts and the related tax effects are included in gain on investments, net and provision for income taxes, respectively, on the Consolidated Statements of Income. (2) The before tax reclassification amount and the related tax effect are included in interest on borrowings and provision for income taxes, respectively, on the Consolidated Statements of Income. The following table presents after-tax changes in each component of accumulated other comprehensive income (loss) for the fiscal years indicated (dollars in millions): 2015 2014 2013 Investments available-for-sale: Beginning balance $ — $ — $ 18 Other comprehensive income before reclassifications — — 13 Amounts reclassified from accumulated other comprehensive income — — (31 ) Current period change — — (18 ) Ending balance $ — $ — $ — Cash flow hedging instruments: Beginning balance $ (18 ) $ — $ — Other comprehensive loss before reclassifications (10 ) (18 ) — Amounts reclassified from accumulated other comprehensive loss 3 — — Current period change (7 ) (18 ) — Ending balance $ (25 ) $ (18 ) $ — Total accumulated other comprehensive income (loss): Beginning balance $ (18 ) $ — $ 18 Other comprehensive income (loss) before reclassifications (10 ) (18 ) 13 Amounts reclassified from accumulated other comprehensive (income) loss 3 — (31 ) Current period change (7 ) (18 ) (18 ) Ending balance $ (25 ) $ (18 ) $ —

Segment and Geographic Area Inf

Segment and Geographic Area Information	12 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment and Geographic Area Information	Segment and Geographic Area Information The Company primarily operates in the securities brokerage industry and has no other reportable segments. Substantially all of the Company's revenues from external clients for the fiscal years ended September 30, 2015 , 2014 and 2013 were derived from its operations in the United States.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Transactions with TD and Affiliates As a result of the Company's acquisition of TD Waterhouse during fiscal 2006, TD became an affiliate of the Company. TD owned approximately 42% of the Company's common stock as of September 30, 2015 . Pursuant to the stockholders agreement among TD, the Company and certain other stockholders, TD has the right to designate five of twelve members of the Company's board of directors. The Company transacts business and has extensive relationships with TD and certain of its affiliates. Transactions with TD and its affiliates are discussed and summarized below. Insured Deposit Account Agreement Under the IDA agreement, the TD Depository Institutions make available to clients of the Company FDIC-insured money market deposit accounts as either designated sweep vehicles or as non-sweep deposit accounts. The Company provides marketing, recordkeeping and support services for the TD Depository Institutions with respect to the money market deposit accounts. In exchange for providing these services, the TD Depository Institutions pay the Company an aggregate marketing fee based on the weighted average yield earned on the client IDA assets, less the actual interest paid to clients, a servicing fee to the TD Depository Institutions and the cost of FDIC insurance premiums. The current IDA agreement became effective as of January 1, 2013 and has an initial term expiring July 1, 2018 . It is automatically renewable for successive five -year terms, provided that it may be terminated by either the Company or the TD Depository Institutions by providing written notice of non-renewal at least two years prior to the initial expiration date or the expiration date of any subsequent renewal period. The fee earned on the IDA agreement is calculated based on two primary components: (a) the yield on fixed-rate "notional" investments, based on prevailing fixed rates for identical balances and maturities in the interest rate swap market (generally LIBOR-based) at the time such investments were added to the IDA portfolio (including any adjustments required to adjust the variable rate leg of such swaps to a one -month reset frequency and the overall swap payment frequency to monthly) and (b) the yield on floating-rate investments. As of September 30, 2015 , the IDA portfolio was comprised of approximately 74% fixed-rate notional investments and 26% floating rate investments. The IDA agreement provides that the Company may designate amounts and maturity dates for the fixed-rate notional investments in the IDA portfolio, subject to certain limitations. For example, if the Company designates that $100 million of deposits be invested in 5 -year fixed-rate investments, and on the day such investment is confirmed by the TD Depository Institutions the prevailing fixed yield for the applicable 5 -year U.S. dollar LIBOR-based swaps is 1.45% , then the Company will earn a gross fixed yield of 1.45% on that portion of the portfolio (before any deductions for interest paid to clients, the servicing fee to the TD Depository Institutions and the cost of FDIC insurance premiums). In the event that (1) the federal funds effective rate is established at 0.75% or greater and (2) the rate on 5 -year U.S. dollar interest rate swaps is equal to or greater than 1.50% for 20 consecutive business days, then the rate earned by the Company on new fixed-rate notional investments will be reduced by 20% of the excess of the 5 -year U.S. dollar swap rate over 1.50% , up to a maximum of 0.10% . The yield on floating-rate investments is calculated daily based on the greater of the following rates published by the Federal Reserve: (1) the interest rate paid by Federal Reserve Banks on balances held in excess of required reserve balances and contractual clearing balances under Regulation D and (2) the daily effective federal funds rate. The interest rates paid to clients are set by the TD Depository Institutions and are not linked to any index. The servicing fee to the TD Depository Institutions under the IDA agreement is equal to 25 basis points on the aggregate average daily balance in the IDA accounts, subject to adjustment as it relates to deposits of less than or equal to $20 billion kept in floating-rate investments or in fixed-rate notional investments with a maturity of up to 24 months ("short-term fixed-rate investments"). For floating-rate and short-term fixed-rate investments, the servicing fee is equal to the difference of the interest rate earned on the investments less the FDIC premiums paid (in basis points), divided by two. The servicing fee has a floor of 3 basis points (subject to adjustment from time to time to reflect material changes to the TD Depository Institutions' leverage costs) and a maximum of 25 basis points. In the event the marketing fee computation results in a negative amount, the Company must pay the TD Depository Institutions the negative amount. This effectively results in the Company guaranteeing the TD Depository Institutions revenue equal to the servicing fee on the IDA agreement, plus the reimbursement of FDIC insurance premiums. The marketing fee computation under the IDA agreement is affected by many variables, including the type, duration, principal balance and yield of the fixed-rate and floating-rate investments, the prevailing interest rate environment, the amount of client deposits and the yield paid on client deposits. Because a negative marketing fee computation would arise only if there were extraordinary movements in many of these variables, the maximum potential amount of future payments the Company could be required to make under this arrangement cannot be reasonably estimated. Management believes the potential for the marketing fee calculation to result in a negative amount is remote. Accordingly, no contingent liability is carried on the Consolidated Balance Sheets for the IDA agreement. In addition, the Company has various other services agreements and transactions with TD and its affiliates. The following tables summarize revenues and expenses resulting from transactions with TD and its affiliates for the fiscal years indicated (dollars in millions): Description Statement of Income Classification Revenues from TD and Affiliates 2015 2014 2013 Insured Deposit Account Agreement Insured deposit account fees $ 839 $ 820 $ 804 Referral and Strategic Alliance Agreement Various 13 12 11 Other Various 6 5 6 Total revenues $ 858 $ 837 $ 821 Description Statement of Income Classification Expenses to TD and Affiliates 2015 2014 2013 Canadian Call Center Services Agreement Professional Services $ 18 $ 17 $ 19 Other Various 4 3 4 Total expenses $ 22 $ 20 $ 23 The following table summarizes the classification and amount of receivables from and payables to TD and its affiliates on the Consolidated Balance Sheets resulting from related party transactions (dollars in millions): September 30, 2015 2014 Assets: Receivable from brokers, dealers and clearing organizations $ — $ 1 Receivable from affiliates 93 99 Liabilities: Payable to brokers, dealers and clearing organizations $ 70 $ 96 Payable to affiliates 6 5 Receivables from and payables to brokers, dealers and clearing organizations primarily relate to securities borrowing and lending activity and are settled in accordance with customary contractual terms. Receivables from and payables to TD affiliates resulting from client cash sweep activity are generally settled in cash the next business day. Other receivables from and payables to affiliates of TD are generally settled in cash on a monthly basis.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	12 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidating Financial Information	Condensed Consolidating Financial Information The 2019 Notes are jointly and severally and fully and unconditionally guaranteed by TDAOH. Presented below is condensed consolidating financial information for the Company, its guarantor subsidiary and its non-guarantor subsidiaries for the periods indicated. Because all other comprehensive income (loss) activity occurred on the parent company for all periods presented, condensed consolidating statements of comprehensive income are not presented. CONDENSED CONSOLIDATING BALANCE SHEET As of September 30, 2015 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) ASSETS Cash and cash equivalents $ 920 $ 2 $ 1,056 $ — $ 1,978 Cash and investments segregated and on deposit for regulatory purposes — — 6,305 — 6,305 Receivable from brokers, dealers and clearing organizations — — 862 — 862 Receivable from clients, net — — 12,770 — 12,770 Investments in subsidiaries 5,762 5,648 — (11,410 ) — Receivable from affiliates 6 1 92 (6 ) 93 Goodwill — — 2,467 — 2,467 Acquired intangible assets, net — 146 515 — 661 Other, net 145 18 1,138 (62 ) 1,239 Total assets $ 6,833 $ 5,815 $ 25,205 $ (11,478 ) $ 26,375 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities: Payable to brokers, dealers and clearing organizations $ — $ — $ 2,707 $ — $ 2,707 Payable to clients — — 16,035 — 16,035 Accounts payable and other liabilities 130 — 523 (16 ) 637 Payable to affiliates — — 12 (6 ) 6 Long-term debt 1,800 — — — 1,800 Deferred income taxes — 53 280 (46 ) 287 Total liabilities 1,930 53 19,557 (68 ) 21,472 Stockholders' equity 4,903 5,762 5,648 (11,410 ) 4,903 Total liabilities and stockholders' equity $ 6,833 $ 5,815 $ 25,205 $ (11,478 ) $ 26,375 CONDENSED CONSOLIDATING BALANCE SHEET As of September 30, 2014 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) ASSETS Cash and cash equivalents $ 117 $ 2 $ 1,341 $ — $ 1,460 Cash and investments segregated and on deposit for regulatory purposes — — 5,116 — 5,116 Receivable from brokers, dealers and clearing organizations — — 1,108 — 1,108 Receivable from clients, net — — 11,639 — 11,639 Investments in subsidiaries 5,868 5,754 — (11,622 ) — Receivable from affiliates 11 2 97 (11 ) 99 Goodwill — — 2,467 — 2,467 Acquired intangible assets, net — 146 605 — 751 Other, net 154 16 1,073 (54 ) 1,189 Total assets $ 6,150 $ 5,920 $ 23,446 $ (11,687 ) $ 23,829 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities: Payable to brokers, dealers and clearing organizations $ — $ — $ 2,421 $ — $ 2,421 Payable to clients — — 14,497 — 14,497 Accounts payable and other liabilities 153 — 455 (13 ) 595 Payable to affiliates — — 16 (11 ) 5 Notes payable 150 — — — 150 Long-term debt 1,099 — — — 1,099 Deferred income taxes — 52 303 (41 ) 314 Total liabilities 1,402 52 17,692 (65 ) 19,081 Stockholders' equity 4,748 5,868 5,754 (11,622 ) 4,748 Total liabilities and stockholders' equity $ 6,150 $ 5,920 $ 23,446 $ (11,687 ) $ 23,829 CONDENSED CONSOLIDATING STATEMENT OF INCOME For the Year Ended September 30, 2015 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) Net revenues $ 17 $ — $ 3,247 $ (17 ) $ 3,247 Operating expenses 16 — 1,923 (17 ) 1,922 Operating income 1 — 1,324 — 1,325 Other expense (income) 43 — (6 ) — 37 Income (loss) before income taxes and equity in income of subsidiaries (42 ) — 1,330 — 1,288 Provision for (benefit from) income taxes (16 ) (1 ) 492 — 475 Income (loss) before equity in income of subsidiaries (26 ) 1 838 — 813 Equity in income of subsidiaries 839 838 — (1,677 ) — Net income $ 813 $ 839 $ 838 $ (1,677 ) $ 813 CONDENSED CONSOLIDATING STATEMENT OF INCOME For the Year Ended September 30, 2014 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) Net revenues $ 14 $ — $ 3,123 $ (14 ) $ 3,123 Operating expenses 13 — 1,839 (14 ) 1,838 Operating income 1 — 1,284 — 1,285 Other expense (income) 24 — (9 ) — 15 Income (loss) before income taxes and equity in income of subsidiaries (23 ) — 1,293 — 1,270 Provision for (benefit from) income taxes (14 ) (1 ) 498 — 483 Income (loss) before equity in income of subsidiaries (9 ) 1 795 — 787 Equity in income of subsidiaries 796 787 17 (1,600 ) — Net income $ 787 $ 788 $ 812 $ (1,600 ) $ 787 CONDENSED CONSOLIDATING STATEMENT OF INCOME For the Year Ended September 30, 2013 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) Net revenues $ 12 $ — $ 2,763 $ (11 ) $ 2,764 Operating expenses 10 — 1,709 (11 ) 1,708 Operating income 2 — 1,054 — 1,056 Other income (23 ) — (9 ) — (32 ) Income before income taxes and equity in income of subsidiaries 25 — 1,063 — 1,088 Provision for income taxes 8 — 405 — 413 Income before equity in income of subsidiaries 17 — 658 — 675 Equity in income of subsidiaries 658 634 36 (1,328 ) — Net income $ 675 $ 634 $ 694 $ (1,328 ) $ 675 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS For the Year Ended September 30, 2015 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Total (In millions) Net cash provided by operating activities $ 27 $ 1 $ 718 $ 746 Cash flows from investing activities: Purchase of property and equipment — — (71 ) (71 ) Proceeds from sale and maturity of short-term investments 500 3 1 504 Purchase of short-term investments (502 ) (3 ) (1 ) (506 ) Proceeds from sale of investments 1 — 9 10 Other, net — — 3 3 Net cash used in investing activities (1 ) — (59 ) (60 ) Cash flows from financing activities: Proceeds from issuance of long-term debt 1,248 — — 1,248 Payment of debt issuance costs (11 ) — — (11 ) Principal payments on long-term debt (569 ) — — (569 ) Principal payments on notes payable (150 ) — — (150 ) Payment of cash dividends (326 ) — — (326 ) Purchase of treasury stock (387 ) — — (387 ) Other, net 27 — — 27 Net cash used in financing activities (168 ) — — (168 ) Intercompany investing and financing activities, net 945 (1 ) (944 ) — Net increase (decrease) in cash and cash equivalents 803 — (285 ) 518 Cash and cash equivalents at beginning of year 117 2 1,341 1,460 Cash and cash equivalents at end of year $ 920 $ 2 $ 1,056 $ 1,978 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS For the Year Ended September 30, 2014 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Total (In millions) Net cash provided by (used in) operating activities $ (81 ) $ 1 $ 1,105 $ 1,025 Cash flows from investing activities: Purchase of property and equipment — — (144 ) (144 ) Proceeds from sale and maturity of short-term investments — — 4 4 Purchase of short-term investments — — (4 ) (4 ) Proceeds from sale of investments 13 — 12 25 Other, net — — 2 2 Net cash provided by (used in) investing activities 13 — (130 ) (117 ) Cash flows from financing activities: Proceeds from issuance of long-term debt 69 — — 69 Proceeds from notes payable 230 — — 230 Principal payments on notes payable (80 ) — — (80 ) Payment of cash dividends (540 ) — — (540 ) Purchase of treasury stock (207 ) — — (207 ) Other, net 18 — — 18 Net cash used in financing activities (510 ) — — (510 ) Intercompany investing and financing activities, net 496 (6 ) (490 ) — Net increase (decrease) in cash and cash equivalents (82 ) (5 ) 485 398 Cash and cash equivalents at beginning of year 199 7 856 1,062 Cash and cash equivalents at end of year $ 117 $ 2 $ 1,341 $ 1,460 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS For the Year Ended September 30, 2013 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Total (In millions) Net cash provided by (used in) operating activities $ (70 ) $ 1 $ 808 $ 739 Cash flows from investing activities: Purchase of property and equipment — — (144 ) (144 ) Proceeds from sale and maturity of short-term investments 150 — 4 154 Purchase of short-term investments — — (4 ) (4 ) Proceeds from sale of investments 78 — 10 88 Other, net — — 2 2 Net cash provided by (used in) investing activities 228 — (132 ) 96 Cash flows from financing activities: Principal payments on long-term debt (250 ) — — (250 ) Proceeds from notes payable 275 — — 275 Principal payments on notes payable (275 ) — — (275 ) Payment of cash dividends (471 ) — — (471 ) Purchase of treasury stock (5 ) — — (5 ) Other, net 43 — (5 ) 38 Net cash used in financing activities (683 ) — (5 ) (688 ) Intercompany investing and financing activities, net 546 — (546 ) — Net increase in cash and cash equivalents 21 1 125 147 Cash and cash equivalents at beginning of year 178 6 731 915 Cash and cash equivalents at end of year $ 199 $ 7 $ 856 $ 1,062

Quarterly Data (Unaudited)

Quarterly Data (Unaudited)	12 Months Ended
	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Data (Unaudited)	Quarterly Data (Unaudited) (Dollars in millions, except per share amounts) For the Fiscal Year Ended September 30, 2015 First Quarter Second Quarter Third Fourth Net revenues $ 819 $ 803 $ 794 $ 831 Operating income $ 344 $ 296 $ 325 $ 360 Net income $ 211 $ 189 $ 197 $ 216 Basic earnings per share $ 0.39 $ 0.35 $ 0.36 $ 0.40 Diluted earnings per share $ 0.39 $ 0.35 $ 0.36 $ 0.40 For the Fiscal Year Ended September 30, 2014 First Quarter Second Quarter Third Quarter Fourth Net revenues $ 752 $ 812 $ 763 $ 795 Operating income $ 307 $ 323 $ 316 $ 338 Net income $ 192 $ 194 $ 190 $ 211 Basic earnings per share $ 0.35 $ 0.35 $ 0.34 $ 0.39 Diluted earnings per share $ 0.35 $ 0.35 $ 0.34 $ 0.38 Quarterly amounts may not sum to fiscal year totals due to rounding.

Nature of Operations and Summ28

Nature of Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation — The consolidated financial statements include the accounts of TD Ameritrade Holding Corporation (the "Parent"), a Delaware corporation, and its wholly-owned subsidiaries (collectively, the "Company"). Intercompany balances and transactions have been eliminated.
Nature of Operations	Nature of Operations — The Company provides securities brokerage services, including trade execution, clearing services and margin lending, through its broker-dealer subsidiaries; futures and foreign exchange trade execution services through its futures commission merchant ("FCM") subsidiary; and trustee, custodial and other trust-related services to retirement plans and other custodial accounts through its state-chartered trust company subsidiary. The Company also provides cash sweep and deposit account products through third-party relationships. The Company's broker-dealer subsidiaries are subject to regulation by the Securities and Exchange Commission ("SEC"), the Financial Industry Regulatory Authority ("FINRA") and the various exchanges in which they maintain membership. The Company's FCM subsidiary is subject to regulation by the Commodity Futures Trading Commission ("CFTC") and the National Futures Association ("NFA"). Dividends from the Company's broker-dealer, FCM and trust company subsidiaries are a source of liquidity for the holding company. Requirements of the SEC, FINRA and CFTC relating to liquidity, net capital standards and the use of client funds and securities may limit funds available for the payment of dividends from the broker-dealer and FCM subsidiaries to the holding company. State regulatory requirements may limit funds available for the payment of dividends from the trust company subsidiary to the holding company.
Use of Estimates	Use of Estimates — The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents — The Company considers temporary, highly-liquid investments with an original maturity of three months or less to be cash equivalents, except for amounts required to be segregated for regulatory purposes.
Cash and Investments Segregated and on Deposit for Regulatory Purposes	Cash and Investments Segregated and on Deposit for Regulatory Purposes — Cash and investments segregated and on deposit for regulatory purposes consists primarily of qualified deposits in special reserve bank accounts for the exclusive benefit of clients under Rule 15c3-3 of the Securities Exchange Act of 1934 (the "Exchange Act") and other regulations. Funds can be held in cash, reverse repurchase agreements, U.S. Treasury securities and other qualified securities. Reverse repurchase agreements (securities purchased under agreements to resell) are treated as collateralized financing transactions and are carried at amounts at which the securities will subsequently be resold, plus accrued interest. The Company's reverse repurchase agreements are collateralized by U.S. Treasury securities and generally have a maturity of seven days. Cash and investments segregated and on deposit for regulatory purposes also includes amounts that have been segregated or secured for the benefit of futures clients according to the regulations of the CFTC governing futures commission merchants.
Securities Borrowed and Securities Loaned	Securities Borrowed and Securities Loaned — Securities borrowed and securities loaned transactions are recorded at the amount of cash collateral provided or received. Securities borrowed transactions require the Company to provide the counterparty with collateral in the form of cash. The Company receives collateral in the form of cash for securities loaned transactions. For these transactions, the fees earned or incurred by the Company are recorded as net interest revenue on the Consolidated Statements of Income. The related interest receivable from and the brokerage interest payable to broker-dealers are included in other receivables and in accounts payable and other liabilities, respectively, on the Consolidated Balance Sheets.
Receivable from/Payable to Clients	Receivable from/Payable to Clients — Receivable from clients primarily consists of margin loans to securities brokerage clients, which are collateralized by client securities, and is carried at the amount receivable, net of an allowance for doubtful accounts that is primarily based on the amount of unsecured margin balances. Payable to clients primarily consists of client cash held in brokerage accounts and is carried at the amount of client cash on deposit. The Company earns interest revenue and pays interest expense on its receivable from client and payable to client balances, respectively. The interest revenue and expense are included in net interest revenue on the Consolidated Statements of Income.
Securities Owned	Securities Owned — Securities owned by our broker-dealer subsidiaries are recorded on a trade-date basis and carried at fair value, and the related changes in fair value are generally included in other revenues on the Consolidated Statements of Income.
Property and Equipment	Property and Equipment — Property and equipment is recorded at cost, net of accumulated depreciation and amortization, except for land, which is recorded at cost. Depreciation is provided using the straight-line method over the estimated useful service lives of the assets, which range from seven to 40 years for buildings and building components and three to seven years for all other depreciable property and equipment. Leasehold improvements are amortized over the lesser of the economic useful life of the improvement or the term of the lease.
Software Development	Software Development — From the date technological feasibility has been established until beta testing is complete, software development costs are capitalized and included in property and equipment. Once the product is fully functional, such costs are amortized in accordance with the Company's normal accounting policies. Software development costs that do not meet capitalization criteria are expensed as incurred.
Goodwill	Goodwill — The Company has recorded goodwill for purchase business combinations to the extent the purchase price of each completed acquisition exceeded the fair value of the net identifiable assets of the acquired company. The Company tests goodwill for impairment on at least an annual basis. In performing the impairment tests, the Company utilizes quoted market prices of the Company's common stock to estimate the fair value of the Company as a whole. The estimated fair value is then allocated to the Company's reporting units based on operating revenues, and is compared with the carrying value of the reporting units. No impairment charges have resulted from the annual impairment tests.
Amortization of Acquired Intangible Assets	Amortization of Acquired Intangible Assets — Acquired intangible assets with finite lives are amortized on a straight-line basis over their estimated useful lives, ranging from three to 23 years. The acquired intangible asset associated with a trademark license agreement is not subject to amortization because the term of the agreement is considered to be indefinite.
Long-Lived Assets and Acquired Intangible Assets	Long-Lived Assets and Acquired Intangible Assets — The Company reviews its long-lived assets and finite-lived acquired intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. The Company evaluates recoverability by comparing the undiscounted cash flows associated with the asset to the asset's carrying amount. The Company also evaluates the remaining useful lives of intangible assets to determine if events or trends warrant a revision to the remaining period of amortization. The Company tests its indefinite-lived acquired intangible asset for impairment on at least an annual basis. To determine if the indefinite-lived intangible asset is impaired, the Company first assesses certain qualitative factors. Based on this assessment, if it is determined that more likely than not the fair value of the indefinite-lived intangible asset is less than its carrying amount, the Company performs a quantitative impairment test. No impairment charges have resulted from the annual impairment tests.
Income Taxes	Income Taxes — The Company files a consolidated U.S. income tax return with its subsidiaries on a calendar year basis, combined returns for state tax purposes where required and certain of its subsidiaries file separate state income tax returns where required. Deferred tax assets and liabilities are determined based on the differences between the financial statement carrying amounts and tax bases of assets and liabilities using enacted tax rates expected to apply to taxable income in the periods in which the deferred tax asset or liability is expected to be settled or realized. Uncertain tax positions are recognized if they are more likely than not to be sustained upon examination, based on the technical merits of the position. The amount of tax benefit recognized is the largest amount of benefit that is greater than 50% likely of being realized upon settlement. The Company recognizes interest and penalties, if any, related to income tax matters as part of the provision for income taxes on the Consolidated Statements of Income.
Capital Stock	Capital Stock — The authorized capital stock of the Company consists of a single class of common stock and one or more series of preferred stock as may be authorized for issuance by the Company's board of directors. Voting, dividend, conversion and liquidation rights of the preferred stock would be established by the board of directors upon issuance of such preferred stock.
Stock-Based Compensation	Stock-Based Compensation — The Company measures and recognizes compensation expense based on estimated grant date fair values for all stock-based payment arrangements. Stock-based compensation expense is based on awards expected to vest and therefore is reduced for estimated forfeitures. Forfeitures are estimated at the time of grant based on the Company's historical forfeiture experience and revised in subsequent periods if actual forfeitures differ from those estimates.
Revenue Recognition	Transaction-based Revenues — Client securities trades are recorded on a settlement-date basis with such trades generally settling within three business days after the trade date. Revenues and expenses related to client trades, including order routing revenue (also referred to as payment for order flow) and revenues from markups on riskless principal trades in fixed-income securities, are recorded on a trade-date basis. Revenues related to client trades are recorded net of promotional allowances. Securities owned by clients, including those that collateralize margin or similar transactions, are not reflected in the accompanying consolidated financial statements. Net Interest Revenue — Net interest revenue primarily consists of income generated by client cash and interest charged to clients on margin balances, net of interest paid to clients on their credit balances. It also includes net interest revenue from securities borrowed and securities loaned transactions. Insured Deposit Account Fees — Insured deposit account fees consist of revenues resulting from the Insured Deposit Account ("IDA") agreement with TD Bank USA, N.A. ("TD Bank USA"), TD Bank, N.A. and The Toronto-Dominion Bank ("TD"). Under the IDA agreement, TD Bank USA and TD Bank, N.A. (together, the "TD Depository Institutions") make available to clients of the Company FDIC-insured money market deposit accounts as either designated sweep vehicles or as non-sweep deposit accounts. The Company provides marketing, recordkeeping and support services for the TD Depository Institutions with respect to the money market deposit accounts. In exchange for providing these services, the TD Depository Institutions pay the Company an aggregate marketing fee based on the weighted average yield earned on the client IDA assets, less the actual interest paid to clients, a servicing fee to the TD Depository Institutions and the cost of FDIC insurance premiums. The IDA agreement is described further in Note 18 . Investment Product Fees — Investment product fee revenue consists of revenues earned on client assets invested in money market mutual funds, other mutual funds and certain Company-sponsored investment programs. During fiscal 2015, the Company introduced a fee rebate offer related to its Amerivest ® investment program. For client assets subject to the rebate offer, if the model portfolio in which the client is invested experiences two consecutive quarters of negative performance (before advisory fees), the Company will refund the advisory fees for both quarters to the client. Advisory fee revenue subject to the rebate offer is recognized once the Company is no longer obligated to refund the fees to the client based on the rebate criteria. As of September 30, 2015, the Company had rebate obligations of $7 million and deferred advisory fee revenue of $3 million , which are included in payable to clients and accounts payable and other liabilities, respectively, on the Consolidated Balance Sheets.
Advertising	Advertising — The Company expenses advertising costs the first time the advertising takes place. Client cash offers are also characterized as advertising expense, rather than as a reduction of revenue, because there is generally little or no cumulative revenue associated with an individual client earning a cash offer at the time the consideration is recognized in the Consolidated Statement of Income.
Derivatives and Hedging Activities	Derivatives and Hedging Activities — The Company occasionally utilizes derivative instruments to manage risks, which may include market price, interest rate and foreign currency risks. The Company does not use derivative instruments for speculative or trading purposes. Derivatives are recorded on the Consolidated Balance Sheets as assets or liabilities at fair value. Derivative instruments properly designated to hedge exposure to changes in the fair value of assets or liabilities are accounted for as fair value hedges. Derivative instruments properly designated to hedge exposure to the variability of expected future cash flows or other forecasted transactions are accounted for as cash flow hedges. The Company formally documents the risk management objective and strategy for each hedge transaction. Derivative instruments that do not qualify for hedge accounting are carried at fair value on the Consolidated Balance Sheets with unrealized gains and losses recorded currently on the Consolidated Statements of Income. Cash flows from derivative instruments accounted for as fair value hedges or cash flow hedges are classified in the same category on the Consolidated Statements of Cash Flows as the cash flows from the items being hedged. For additional information on the Company's fair value and cash flow hedging instruments, see Note 8 .
Earnings Per Share	Earnings Per Share — Basic earnings per share ("EPS") is computed by dividing net income by the weighted average common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, except when such assumed exercise or conversion would have an antidilutive effect on EPS. The difference between the numerator and denominator used in the Company's computation of basic and diluted earnings per share consists of common stock equivalent shares related to stock-based compensation. The Company excluded from the calculation of diluted earnings per share 0.7 million shares underlying the stock-based compensation awards for fiscal year 2013 because their inclusion would have been antidilutive. There were no material antidilutive awards for fiscal years 2015 and 2014 .
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements ASU 2014-11 — During fiscal 2015, the Company adopted Accounting Standards Update ("ASU") 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures . The amendments in ASU 2014-11 require entities to account for repurchase-to-maturity transactions and linked repurchase financings as secured borrowings, which is consistent with the accounting for other repurchase agreements. The new accounting requirements did not result in any accounting changes because the Company does not act as a transferor in repurchase-to-maturity transactions or linked repurchase financings. In addition, the amendments require new disclosures, including information regarding collateral pledged in securities lending transactions and similar transactions that are accounted for as secured borrowings. The Company prospectively adopted the new disclosure requirements related to collateral pledged in transactions that are accounted for as secured borrowings. Adoption of ASU 2014-11 resulted only in certain additional disclosures presented in Note 15. ASU 2015-03 — On September 30, 2015, the Company retrospectively adopted, for all comparative periods presented, ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs . The amendments in ASU 2015-03 require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The adoption of ASU 2015-03 resulted in a change to the location where debt issuance costs are presented in the balance sheet and did not have any other material impact on the Company's financial statements. As of September 30, 2015, the Company had debt issuance costs related to recognized debt liabilities of approximately $12 million , which are included as a deduction from long-term debt on the Consolidated Balance Sheet. In order to conform to the current financial statement presentation, approximately $2 million of unamortized debt issuance costs have been reclassified from other assets to a deduction from long-term debt as of September 30, 2014 on the Consolidated Balance Sheet.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements ASU 2014-09 — In May 2014, the Financial Accounting Standards Board issued ASU 2014-09, Revenue from Contracts with Customers , to clarify the principles of recognizing revenue from contracts with customers and to improve financial reporting by creating common revenue recognition guidance for U.S. GAAP and International Financial Reporting Standards. This ASU will supersede the revenue recognition requirements in Accounting Standards Codification ("ASC") Topic 605, Revenue Recognition, and most industry-specific guidance. Entities are required to apply the following steps when recognizing revenue under ASU 2014-09: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and, (5) recognize revenue when (or as) the entity satisfies a performance obligation. This ASU also requires additional disclosures related to the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. An entity may apply the amendments by using one of the following two methods: (1) retrospective application to each prior reporting period presented or (2) a modified retrospective approach, requiring the standard be applied only to the most current period presented, with the cumulative effect of initially applying the standard recognized at the date of initial application. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Therefore, ASU 2014-09 will be effective for the Company's fiscal year beginning October 1, 2018. Early adoption is permitted for annual reporting periods beginning after December 15, 2016. The Company is currently assessing the impact that ASU 2014-09 will have on the Company's financial statements and evaluating which adoption method to apply.
Loss Contingencies (ASC) 450	ASC 450, Loss Contingencies , governs the recognition and disclosure of loss contingencies, including potential losses from legal and regulatory matters. ASC 450 categorizes loss contingencies using three terms based on the likelihood of occurrence of events that result in a loss: "probable" means that "the future event or events are likely to occur;" "remote" means that "the chance of the future event or events occurring is slight;" and "reasonably possible" means that "the chance of the future event or events occurring is more than remote but less than likely." Under ASC 450, the Company accrues for losses that are considered both probable and reasonably estimable.
Fair Value Measurement (ASC) 820-10	ASC 820-10, Fair Value Measurement , defines fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. ASC 820-10 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability, developed based on market data obtained from sources independent of the Company. Unobservable inputs reflect the Company's own assumptions about the assumptions market participants would use in pricing the asset or liability, developed based on the best information available in the circumstances.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Sep. 30, 2015
Cash and Cash Equivalents [Abstract]
Summary of Cash and Cash Equivalents	The Company's cash and cash equivalents is summarized in the following table (dollars in millions): September 30, 2015 2014 Corporate $ 1,069 $ 298 Broker-dealer subsidiaries 721 1,090 Futures commission merchant subsidiary 72 — Trust company subsidiary 77 53 Investment advisory subsidiaries 39 19 Total $ 1,978 $ 1,460

Cash and Investments Segregat30

Cash and Investments Segregated and on Deposit for Regulatory Purposes (Tables)	12 Months Ended
	Sep. 30, 2015
Restricted Cash and Investments [Abstract]
Cash and Investments Segregated and on Deposit for Regulatory Purposes	Cash and investments segregated and on deposit for regulatory purposes consists of the following (dollars in millions): September 30, 2015 2014 U.S. government debt securities $ 3,706 $ 3,070 Reverse repurchase agreements (collateralized by U.S. government debt securities) 1,586 1,193 Cash in demand deposit accounts 802 617 Cash on deposit with futures commission merchants 136 186 U.S. government debt securities on deposit with futures commission merchant 75 50 Total $ 6,305 $ 5,116

Receivable from and Payable t31

Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Tables)	12 Months Ended
	Sep. 30, 2015
Brokers and Dealers [Abstract]
Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations	Amounts receivable from and payable to brokers, dealers and clearing organizations consist of the following (dollars in millions): September 30, 2015 2014 Receivable: Deposits paid for securities borrowed $ 664 $ 995 Broker-dealers 2 3 Clearing organizations 190 104 Securities failed to deliver 6 6 Total $ 862 $ 1,108 Payable: Deposits received for securities loaned $ 2,653 $ 2,384 Broker-dealers 1 3 Clearing organizations 19 23 Securities failed to receive 34 11 Total $ 2,707 $ 2,421

Allowance for Doubtful Accoun32

Allowance for Doubtful Accounts on Receivables (Tables)	12 Months Ended
	Sep. 30, 2015
Valuation and Qualifying Accounts [Abstract]
Allowance for Doubtful Accounts on Client and Other Receivables	The following table summarizes activity in the Company's allowance for doubtful accounts on client and other receivables for the fiscal years indicated (dollars in millions): 2015 2014 2013 Beginning balance $ 10 $ 15 $ 21 Provision for (recovery of) doubtful accounts, net 6 3 (1 ) Write-off of doubtful accounts (4 ) (8 ) (5 ) Ending balance $ 12 $ 10 $ 15

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment consists of the following (dollars in millions): September 30, 2015 2014 Buildings and building components $ 268 $ 264 Computer equipment 233 220 Software 188 170 Leasehold improvements 161 156 Land 20 20 Other property and equipment 76 72 946 902 Less: Accumulated depreciation and amortization (425 ) (359 ) Property and equipment at cost, net $ 521 $ 543

Goodwill and Acquired Intangi34

Goodwill and Acquired Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired Intangible Assets	Acquired intangible assets consist of the following (dollars in millions): September 30, 2015 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Client relationships $ 1,228 $ (722 ) $ 506 $ 1,228 $ (645 ) $ 583 Technology and content 99 (90 ) 9 99 (77 ) 22 Trademark license 146 — 146 146 — 146 $ 1,473 $ (812 ) $ 661 $ 1,473 $ (722 ) $ 751
Estimated Future Amortization Expense for Acquired Intangible Assets	Estimated future amortization expense for acquired intangible assets outstanding as of September 30, 2015 is as follows (dollars in millions): Fiscal Year Estimated Amortization Expense 2016 $ 85 2017 76 2018 72 2019 68 2020 63 Thereafter (to 2025) 151 Total $ 515

Notes Payable and Long-term D35

Notes Payable and Long-term Debt (Tables)	12 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Schedule of Notes Payable and Long Term Debt	Notes payable and long-term debt consist of the following (dollars in millions): September 30, 2015 Face Value Unamortized Discounts and Debt Issuance Costs Fair Value Adjustment (1) Net Carrying Value Senior Notes: 5.600% Notes due 2019 $ 500 $ (2 ) $ 40 $ 538 2.950% Notes due 2022 750 (7 ) — 743 3.625% Notes due 2025 500 (4 ) 23 519 Total long-term debt $ 1,750 $ (13 ) $ 63 $ 1,800 September 30, 2014 Face Value Unamortized Discounts and Debt Issuance Costs Fair Value Adjustment (1) Net Carrying Value Notes payable: Parent Revolving Facility $ 150 $ — $ — $ 150 Long-term debt: Senior Notes: 4.150% Notes due 2014 500 — 2 502 5.600% Notes due 2019 500 (2 ) 30 528 Secured Loan: Variable-rate Note due 2019 69 — — 69 Subtotal - Long-term debt 1,069 (2 ) 32 1,099 Total notes payable and long-term debt $ 1,219 $ (2 ) $ 32 $ 1,249 (1) Fair value adjustments relate to changes in the fair value of the debt while in a fair value hedging relationship. See "Fair Value Hedging" below.
Fiscal Year Maturities on Long-term Debt Outstanding	Fiscal year maturities on long-term debt outstanding at September 30, 2015 are as follows (dollars in millions): 2016 $ — 2017 — 2018 — 2019 — 2020 500 Thereafter 1,250 Total $ 1,750
Summary of Senior Notes	Key information about the Senior Notes is summarized in the following table (dollars in millions): Description Date Issued Maturity Date Aggregate Principal Interest Rate 2014 Notes November 25, 2009 December 1, 2014 $500 4.150% 2019 Notes November 25, 2009 December 1, 2019 $500 5.600% 2022 Notes March 4, 2015 April 1, 2022 $750 2.950% 2025 Notes October 17, 2014 April 1, 2025 $500 3.625%
Gains and Losses Resulting from Changes in Fair Value of Interest Rate Swaps and Hedged Fixed Rate Debt [Table Text Block]	The following table summarizes gains and losses resulting from changes in the fair value of interest rate swaps designated as fair value hedges and the hedged fixed-rate debt for the fiscal years indicated (dollars in millions): 2015 2014 2013 Gain (loss) on fair value of interest rate swaps $ 31 $ (20 ) $ (44 ) Gain (loss) on fair value of hedged fixed-rate debt (31 ) 20 44 Net gain (loss) recorded in interest on borrowings $ — $ — $ —
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes pre-tax losses resulting from changes in the fair value of the forward-starting interest rate swaps for the fiscal years indicated (dollars in millions): Amount of Loss Recognized in Other Comprehensive Loss (Effective Portion) 2015 2014 2013 Forward-starting interest rate swaps $ (15 ) $ (29 ) $ —
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table summarizes the fair value of outstanding derivatives designated as hedging instruments on the Consolidated Balance Sheets (dollars in millions): Balance Sheet Location September 30, 2015 2014 Interest rate contracts: Pay-variable interest rate swaps designated as fair value hedges Other assets $ 63 $ 32 Forward-starting interest rate swaps designated as cash flow hedges Accounts payable and other liabilities $ — $ (29 )

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Provision for Income Taxes	Provision for income taxes is comprised of the following for the fiscal years indicated (dollars in millions): 2015 2014 2013 Current expense: Federal $ 470 $ 457 $ 370 State 28 53 33 498 510 403 Deferred expense (benefit): Federal (22 ) (28 ) (2 ) State (1 ) 1 12 (23 ) (27 ) 10 Provision for income taxes $ 475 $ 483 $ 413
Reconciliation of Federal Statutory Tax Rate to Effective Tax Rate	A reconciliation of the federal statutory tax rate to the effective tax rate applicable to pre-tax income follows for the fiscal years indicated: 2015 2014 2013 Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal tax effect 3.0 3.1 2.6 Adjustments to estimated state income taxes 0.1 0.2 0.4 Interest recorded (reversed) on unrecognized tax benefits, net (0.1 ) 0.2 0.3 Reversal of accruals for unrecognized tax benefits (1.1 ) (0.5 ) (0.3 ) 36.9 % 38.0 % 38.0 %
Deferred Tax Assets (Liabilities)	Deferred tax assets (liabilities) are comprised of the following (dollars in millions): September 30, 2015 2014 Deferred tax assets: Accrued and other liabilities $ 76 $ 78 Intangible assets, state tax benefit 7 10 Stock-based compensation 37 37 Allowance for doubtful accounts 5 5 Operating loss carryforwards 7 12 Unrecognized loss on cash flow hedging instruments 15 11 Other deferred tax assets 1 — Gross deferred tax assets 148 153 Less: Valuation allowance (4 ) (9 ) Net deferred tax assets 144 144 Deferred tax liabilities: Acquired intangible assets (387 ) (410 ) Property and equipment (39 ) (42 ) Other deferred tax liabilities (5 ) (6 ) Total deferred tax liabilities (431 ) (458 ) Net deferred tax liabilities $ (287 ) $ (314 )
Reconciliation of Activity Related to Unrecognized Tax Benefits	A reconciliation of the activity related to unrecognized tax benefits follows for the fiscal years indicated (dollars in millions): 2015 2014 2013 Beginning balance $ 165 $ 137 $ 139 Additions based on tax positions related to the current year 16 29 8 Additions for tax positions of prior years 5 10 2 Reductions for tax positions of prior years (4 ) (1 ) (5 ) Reductions due to settlements with taxing authorities (21 ) — (1 ) Reductions due to lapsed statute of limitations (7 ) (10 ) (6 ) Ending balance $ 154 $ 165 $ 137

Capital Requirements (Tables)

Capital Requirements (Tables)	12 Months Ended
	Sep. 30, 2015
Regulatory Capital Requirements [Abstract]
Net Capital and Net Capital Requirements for Company's Broker-dealer Subsidiaries	Net capital and net capital requirements for the Company's broker-dealer subsidiaries are summarized in the following tables (dollars in millions): TD Ameritrade Clearing, Inc. Date Net Capital Required Net Capital (2% of Aggregate Debit Balances) Net Capital in Excess of Required Net Capital Net Capital in Excess of Early Warning Threshold (5% of Aggregate Debit Balances) Ratio of Net Capital to Aggregate Debit Balances September 30, 2015 $ 1,581 $ 310 $ 1,271 $ 807 10.22 % September 30, 2014 $ 1,569 $ 280 $ 1,289 $ 868 11.19 % TD Ameritrade, Inc. Date Net Capital Required Net Capital (8% of Total Risk Margin or $250,000 Minimum Dollar Requirement) Net Capital in Excess of Required Net Capital Net Capital in Excess of Early Warning Threshold (110% or 120% of Required Net Capital) September 30, 2015 $ 228 $ — $ 228 $ 227 September 30, 2014 $ 347 $ 17 $ 330 $ 328
Minimum Financial Requirements for Futures Commission Merchants under Commodity Exchange Act [Table Text Block]	During October 2014, TDAFF registered as an FCM with the CFTC. TDAFF is subject to CFTC Regulation 1.17 under the Commodity Exchange Act, which requires the maintenance of minimum net capital as described above. Net capital and net capital requirements for TDAFF are summarized in the following table (dollars in millions): TD Ameritrade Futures & Forex LLC Date Net Capital Required Net Capital (8% of Total Risk Margin) Net Capital in Excess of Required Net Capital Net Capital in Excess of Early Warning Threshold (110% of Required Net Capital) September 30, 2015 $ 90 $ 12 $ 78 $ 78 September 30, 2014 N/A N/A N/A N/A

Stock-based Compensation (Table

Stock-based Compensation (Tables)	12 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity in Stock Incentive Plans	The following is a summary of option activity in the Company's stock incentive plans for the fiscal year ended September 30, 2015 : Number of Options (in thousands) Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in millions) Outstanding at beginning of year 2,136 $ 18.43 Exercised (849 ) $ 17.98 Expired (1 ) $ 37.08 Outstanding at end of year 1,286 $ 18.71 2.7 $ 17 Exercisable at end of year 1,286 $ 18.71 2.7 $ 17
Summary of Restricted Stock Units Activity in Stock Incentive Plans	The following is a summary of RSU activity in the Company's stock incentive plans for the fiscal year ended September 30, 2015 : Number of Units (in thousands) Weighted Average Grant Date Fair Value Nonvested at beginning of year 4,832 $ 19.57 Granted 1,207 $ 34.34 Dividend equivalents 70 $ 23.18 Vested (1,787 ) $ 17.02 Forfeited (110 ) $ 25.28 Nonvested at end of year 4,212 $ 24.79

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Rental Commitments Under Non-Cancelable Operating Leases	The Company has various non-cancelable operating leases on facilities requiring annual payments as follows (dollars in millions): Fiscal Year Minimum Lease Payments Sublease Income Net Lease Commitments 2016 $ 54 $ (2 ) $ 52 2017 54 (2 ) 52 2018 52 (1 ) 51 2019 49 (1 ) 48 2020 39 — 39 Thereafter (to 2030) 70 — 70 Total $ 318 $ (6 ) $ 312
Collateral Available, Loaned or Repledged	The following table summarizes the fair values of client margin securities and stock borrowings that were available to the Company to utilize as collateral on various borrowings or for other purposes, and the amount of that collateral loaned or repledged by the Company (dollars in billions): September 30, 2015 2014 Client margin securities $ 17.7 $ 16.2 Stock borrowings 0.7 1.0 Total collateral available $ 18.4 $ 17.2 Collateral loaned $ 2.7 $ 2.4 Collateral repledged 3.8 2.5 Total collateral loaned or repledged $ 6.5 $ 4.9
Summary of Cash Deposited with and Securities Pledged to Clearinghouses	The following table summarizes cash deposited with and securities pledged to clearinghouses by the Company (dollars in millions): September 30, Assets Balance Sheet Classification 2015 2014 Cash Receivable from brokers, dealers and clearing organizations $ 190 $ 104 U.S. government debt securities Securities owned, at fair value 350 181 Total $ 540 $ 285

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	12 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Assets and Liabilities Measured on Recurring Basis	The following tables present the Company's fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of September 30, 2015 and 2014 (dollars in millions): As of September 30, 2015 Level 1 Level 2 Level 3 Fair Value Assets: Cash equivalents: Money market mutual funds $ 1,888 $ — $ — $ 1,888 Investments segregated for regulatory purposes: U.S. government debt securities — 3,781 — 3,781 Securities owned: Money market and other mutual funds — — 2 2 U.S. government debt securities — 415 — 415 Other 3 5 — 8 Subtotal - Securities owned 3 420 2 425 Other assets: Pay-variable interest rate swaps (1) — 63 — 63 U.S. government debt securities — 4 — 4 Auction rate securities — — 1 1 Subtotal - Other assets — 67 1 68 Total assets at fair value $ 1,891 $ 4,268 $ 3 $ 6,162 Liabilities: Accounts payable and other liabilities: Securities sold, not yet purchased: Equity securities $ 23 $ — $ — $ 23 (1) See " Fair Value Hedging " in Note 8 for details. As of September 30, 2014 Level 1 Level 2 Level 3 Fair Value Assets: Cash equivalents: Money market mutual funds $ 1,284 $ — $ — $ 1,284 Investments segregated for regulatory purposes: U.S. government debt securities — 3,120 — 3,120 Securities owned: Money market and other mutual funds — — 1 1 U.S. government debt securities — 326 — 326 Other 2 3 — 5 Subtotal - Securities owned 2 329 1 332 Other assets: Pay-variable interest rate swaps (1) — 32 — 32 U.S. government debt securities — 4 — 4 Auction rate securities — — 1 1 Subtotal - Other assets — 36 1 37 Total assets at fair value $ 1,286 $ 3,485 $ 2 $ 4,773 Liabilities: Accounts payable and other liabilities: Forward-starting interest rate swaps (2) $ — $ 29 $ — $ 29 Securities sold, not yet purchased: Equity securities 1 — — 1 Total liabilities at fair value $ 1 $ 29 $ — $ 30 (1) See " Fair Value Hedging " in Note 8 for details. (2) See " Cash Flow Hedging " in Note 8 for details.

Offsetting Assets and Liabili41

Offsetting Assets and Liabilities (Tables)	12 Months Ended
	Sep. 30, 2015
Offsetting [Abstract]
Effect of Rights of Setoff Associated with Company's Recognized Assets and Liabilities	The following tables present information about the potential effect of rights of setoff associated with the Company's recognized assets and liabilities as of September 30, 2015 and 2014 (dollars in millions): September 30, 2015 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts of Recognized Assets and Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts Presented in the Consolidated Balance Sheet Financial Instruments (4) Collateral Received or Pledged (Including Cash) (5) Net Amount (6) Assets: Investments segregated for regulatory purposes: Reverse repurchase agreements $ 1,586 $ — $ 1,586 $ — $ (1,586 ) $ — Receivable from brokers, dealers and clearing organizations: Deposits paid for securities borrowed (1) 664 — 664 (70 ) (585 ) 9 Other assets: Pay-variable interest rate swaps 63 — 63 — (63 ) — Total $ 2,313 $ — $ 2,313 $ (70 ) $ (2,234 ) $ 9 Liabilities: Payable to brokers, dealers and clearing organizations: Deposits received for securities loaned (2)(3) $ 2,653 $ — $ 2,653 $ (70 ) $ (2,364 ) $ 219 September 30, 2014 Gross Amounts Not Offset in the Consolidated Balance Sheet Gross Amounts of Recognized Assets and Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts Presented in the Consolidated Balance Sheet Financial Instruments (4) Collateral Received or Pledged (Including Cash) (5) Net Amount (6) Assets: Investments segregated for regulatory purposes: Reverse repurchase agreements $ 1,193 $ — $ 1,193 $ — $ (1,193 ) $ — Receivable from brokers, dealers and clearing organizations: Deposits paid for securities borrowed (1) 995 — 995 (69 ) (900 ) 26 Other assets: Pay-variable interest rate swaps 32 — 32 — (32 ) — Total $ 2,220 $ — $ 2,220 $ (69 ) $ (2,125 ) $ 26 Liabilities: Payable to brokers, dealers and clearing organizations: Deposits received for securities loaned (2) $ 2,384 $ — $ 2,384 $ (69 ) $ (2,015 ) $ 300 Accounts payable and other liabilities: Forward-starting interest rate swaps 29 — 29 — (29 ) — Total $ 2,413 $ — $ 2,413 $ (69 ) $ (2,044 ) $ 300 (1) Included in the gross amounts of deposits paid for securities borrowed is $332 million and $616 million as of September 30, 2015 and 2014 , respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of cash to the Company. See "General Contingencies" in Note 13 for a discussion of the potential risks associated with securities borrowing transactions and how the Company mitigates those risks. (2) Included in the gross amounts of deposits received for securities loaned is $1,164 million and $754 million as of September 30, 2015 and 2014 , respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of securities to the Company. See "General Contingencies" in Note 13 for a discussion of the potential risks associated with securities lending transactions and how the Company mitigates those risks. (3) Substantially all of the Company's securities lending transactions have a continuous contractual term and, upon notice by either party, may be terminated within three business days. The following table summarizes the Company's gross liability for securities lending transactions by the class of securities loaned (dollars in millions): September 30, 2015 Deposits received for securities loaned: Equity securities $ 2,413 Exchange-traded funds 150 Closed-end funds 41 Other 49 Total $ 2,653 (4) Amounts represent recognized assets and liabilities that are subject to enforceable master agreements with rights of setoff. (5) Represents the fair value of collateral the Company had received or pledged under enforceable master agreements, limited for table presentation purposes to the net amount of the recognized assets due from or liabilities due to each counterparty. At September 30, 2015 and 2014 , the Company had received total collateral with a fair value of $2,350 million and $2,231 million , respectively, and pledged total collateral with a fair value of $2,437 million and $2,124 million , respectively. (6) Represents the amount for which, in the case of net recognized assets, the Company had not received collateral, and in the case of net recognized liabilities, the Company had not pledged collateral.
Disaggregation of Gross Secured Lending Transactions	The following table summarizes the Company's gross liability for securities lending transactions by the class of securities loaned (dollars in millions): September 30, 2015 Deposits received for securities loaned: Equity securities $ 2,413 Exchange-traded funds 150 Closed-end funds 41 Other 49 Total $ 2,653

Accumulated Other Comprehensi42

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Abstract]
Comprehensive Income (Loss)	The following table presents the net change in fair value recorded for each component of other comprehensive loss before and after income tax for the fiscal years indicated (dollars in millions): 2015 2014 2013 Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Investments available-for-sale: Net unrealized gain $ — $ — $ — $ — $ — $ — $ 21 $ (8 ) $ 13 Reclassification adjustment for net realized gain included in net income (1) — — — — — — (52 ) 19 (33 ) Reclassification of impairment charge (1) — — — — — — 3 (1 ) 2 Change in net unrealized gain — — — — — — (28 ) 10 (18 ) Cash flow hedging instruments: Net unrealized loss (15 ) 5 (10 ) (29 ) 11 (18 ) — — — Reclassification adjustment for portion of realized loss amortized to net income (2) 4 (1 ) 3 — — — — — — Change in net unrealized loss (11 ) 4 (7 ) (29 ) 11 (18 ) — — — Other comprehensive loss $ (11 ) $ 4 $ (7 ) $ (29 ) $ 11 $ (18 ) $ (28 ) $ 10 $ (18 ) (1) The before tax reclassification amounts and the related tax effects are included in gain on investments, net and provision for income taxes, respectively, on the Consolidated Statements of Income. (2) The before tax reclassification amount and the related tax effect are included in interest on borrowings and provision for income taxes, respectively, on the Consolidated Statements of Income.
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents after-tax changes in each component of accumulated other comprehensive income (loss) for the fiscal years indicated (dollars in millions): 2015 2014 2013 Investments available-for-sale: Beginning balance $ — $ — $ 18 Other comprehensive income before reclassifications — — 13 Amounts reclassified from accumulated other comprehensive income — — (31 ) Current period change — — (18 ) Ending balance $ — $ — $ — Cash flow hedging instruments: Beginning balance $ (18 ) $ — $ — Other comprehensive loss before reclassifications (10 ) (18 ) — Amounts reclassified from accumulated other comprehensive loss 3 — — Current period change (7 ) (18 ) — Ending balance $ (25 ) $ (18 ) $ — Total accumulated other comprehensive income (loss): Beginning balance $ (18 ) $ — $ 18 Other comprehensive income (loss) before reclassifications (10 ) (18 ) 13 Amounts reclassified from accumulated other comprehensive (income) loss 3 — (31 ) Current period change (7 ) (18 ) (18 ) Ending balance $ (25 ) $ (18 ) $ —

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Schedule of Related Party Transactions [Table Text Block]	The following tables summarize revenues and expenses resulting from transactions with TD and its affiliates for the fiscal years indicated (dollars in millions): Description Statement of Income Classification Revenues from TD and Affiliates 2015 2014 2013 Insured Deposit Account Agreement Insured deposit account fees $ 839 $ 820 $ 804 Referral and Strategic Alliance Agreement Various 13 12 11 Other Various 6 5 6 Total revenues $ 858 $ 837 $ 821 Description Statement of Income Classification Expenses to TD and Affiliates 2015 2014 2013 Canadian Call Center Services Agreement Professional Services $ 18 $ 17 $ 19 Other Various 4 3 4 Total expenses $ 22 $ 20 $ 23 The following table summarizes the classification and amount of receivables from and payables to TD and its affiliates on the Consolidated Balance Sheets resulting from related party transactions (dollars in millions): September 30, 2015 2014 Assets: Receivable from brokers, dealers and clearing organizations $ — $ 1 Receivable from affiliates 93 99 Liabilities: Payable to brokers, dealers and clearing organizations $ 70 $ 96 Payable to affiliates 6 5

Condensed Consolidating Finan44

Condensed Consolidating Financial Information (Tables)	12 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Condensed Consolidating Balance Sheet	CONDENSED CONSOLIDATING BALANCE SHEET As of September 30, 2015 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) ASSETS Cash and cash equivalents $ 920 $ 2 $ 1,056 $ — $ 1,978 Cash and investments segregated and on deposit for regulatory purposes — — 6,305 — 6,305 Receivable from brokers, dealers and clearing organizations — — 862 — 862 Receivable from clients, net — — 12,770 — 12,770 Investments in subsidiaries 5,762 5,648 — (11,410 ) — Receivable from affiliates 6 1 92 (6 ) 93 Goodwill — — 2,467 — 2,467 Acquired intangible assets, net — 146 515 — 661 Other, net 145 18 1,138 (62 ) 1,239 Total assets $ 6,833 $ 5,815 $ 25,205 $ (11,478 ) $ 26,375 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities: Payable to brokers, dealers and clearing organizations $ — $ — $ 2,707 $ — $ 2,707 Payable to clients — — 16,035 — 16,035 Accounts payable and other liabilities 130 — 523 (16 ) 637 Payable to affiliates — — 12 (6 ) 6 Long-term debt 1,800 — — — 1,800 Deferred income taxes — 53 280 (46 ) 287 Total liabilities 1,930 53 19,557 (68 ) 21,472 Stockholders' equity 4,903 5,762 5,648 (11,410 ) 4,903 Total liabilities and stockholders' equity $ 6,833 $ 5,815 $ 25,205 $ (11,478 ) $ 26,375 CONDENSED CONSOLIDATING BALANCE SHEET As of September 30, 2014 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) ASSETS Cash and cash equivalents $ 117 $ 2 $ 1,341 $ — $ 1,460 Cash and investments segregated and on deposit for regulatory purposes — — 5,116 — 5,116 Receivable from brokers, dealers and clearing organizations — — 1,108 — 1,108 Receivable from clients, net — — 11,639 — 11,639 Investments in subsidiaries 5,868 5,754 — (11,622 ) — Receivable from affiliates 11 2 97 (11 ) 99 Goodwill — — 2,467 — 2,467 Acquired intangible assets, net — 146 605 — 751 Other, net 154 16 1,073 (54 ) 1,189 Total assets $ 6,150 $ 5,920 $ 23,446 $ (11,687 ) $ 23,829 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities: Payable to brokers, dealers and clearing organizations $ — $ — $ 2,421 $ — $ 2,421 Payable to clients — — 14,497 — 14,497 Accounts payable and other liabilities 153 — 455 (13 ) 595 Payable to affiliates — — 16 (11 ) 5 Notes payable 150 — — — 150 Long-term debt 1,099 — — — 1,099 Deferred income taxes — 52 303 (41 ) 314 Total liabilities 1,402 52 17,692 (65 ) 19,081 Stockholders' equity 4,748 5,868 5,754 (11,622 ) 4,748 Total liabilities and stockholders' equity $ 6,150 $ 5,920 $ 23,446 $ (11,687 ) $ 23,829
Schedule of Condensed Consolidating Statement of Income	CONDENSED CONSOLIDATING STATEMENT OF INCOME For the Year Ended September 30, 2015 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) Net revenues $ 17 $ — $ 3,247 $ (17 ) $ 3,247 Operating expenses 16 — 1,923 (17 ) 1,922 Operating income 1 — 1,324 — 1,325 Other expense (income) 43 — (6 ) — 37 Income (loss) before income taxes and equity in income of subsidiaries (42 ) — 1,330 — 1,288 Provision for (benefit from) income taxes (16 ) (1 ) 492 — 475 Income (loss) before equity in income of subsidiaries (26 ) 1 838 — 813 Equity in income of subsidiaries 839 838 — (1,677 ) — Net income $ 813 $ 839 $ 838 $ (1,677 ) $ 813 CONDENSED CONSOLIDATING STATEMENT OF INCOME For the Year Ended September 30, 2014 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) Net revenues $ 14 $ — $ 3,123 $ (14 ) $ 3,123 Operating expenses 13 — 1,839 (14 ) 1,838 Operating income 1 — 1,284 — 1,285 Other expense (income) 24 — (9 ) — 15 Income (loss) before income taxes and equity in income of subsidiaries (23 ) — 1,293 — 1,270 Provision for (benefit from) income taxes (14 ) (1 ) 498 — 483 Income (loss) before equity in income of subsidiaries (9 ) 1 795 — 787 Equity in income of subsidiaries 796 787 17 (1,600 ) — Net income $ 787 $ 788 $ 812 $ (1,600 ) $ 787 CONDENSED CONSOLIDATING STATEMENT OF INCOME For the Year Ended September 30, 2013 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Eliminations Total (In millions) Net revenues $ 12 $ — $ 2,763 $ (11 ) $ 2,764 Operating expenses 10 — 1,709 (11 ) 1,708 Operating income 2 — 1,054 — 1,056 Other income (23 ) — (9 ) — (32 ) Income before income taxes and equity in income of subsidiaries 25 — 1,063 — 1,088 Provision for income taxes 8 — 405 — 413 Income before equity in income of subsidiaries 17 — 658 — 675 Equity in income of subsidiaries 658 634 36 (1,328 ) — Net income $ 675 $ 634 $ 694 $ (1,328 ) $ 675
Schedule of Condensed Consolidating Statement of Cash Flows	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS For the Year Ended September 30, 2015 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Total (In millions) Net cash provided by operating activities $ 27 $ 1 $ 718 $ 746 Cash flows from investing activities: Purchase of property and equipment — — (71 ) (71 ) Proceeds from sale and maturity of short-term investments 500 3 1 504 Purchase of short-term investments (502 ) (3 ) (1 ) (506 ) Proceeds from sale of investments 1 — 9 10 Other, net — — 3 3 Net cash used in investing activities (1 ) — (59 ) (60 ) Cash flows from financing activities: Proceeds from issuance of long-term debt 1,248 — — 1,248 Payment of debt issuance costs (11 ) — — (11 ) Principal payments on long-term debt (569 ) — — (569 ) Principal payments on notes payable (150 ) — — (150 ) Payment of cash dividends (326 ) — — (326 ) Purchase of treasury stock (387 ) — — (387 ) Other, net 27 — — 27 Net cash used in financing activities (168 ) — — (168 ) Intercompany investing and financing activities, net 945 (1 ) (944 ) — Net increase (decrease) in cash and cash equivalents 803 — (285 ) 518 Cash and cash equivalents at beginning of year 117 2 1,341 1,460 Cash and cash equivalents at end of year $ 920 $ 2 $ 1,056 $ 1,978 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS For the Year Ended September 30, 2014 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Total (In millions) Net cash provided by (used in) operating activities $ (81 ) $ 1 $ 1,105 $ 1,025 Cash flows from investing activities: Purchase of property and equipment — — (144 ) (144 ) Proceeds from sale and maturity of short-term investments — — 4 4 Purchase of short-term investments — — (4 ) (4 ) Proceeds from sale of investments 13 — 12 25 Other, net — — 2 2 Net cash provided by (used in) investing activities 13 — (130 ) (117 ) Cash flows from financing activities: Proceeds from issuance of long-term debt 69 — — 69 Proceeds from notes payable 230 — — 230 Principal payments on notes payable (80 ) — — (80 ) Payment of cash dividends (540 ) — — (540 ) Purchase of treasury stock (207 ) — — (207 ) Other, net 18 — — 18 Net cash used in financing activities (510 ) — — (510 ) Intercompany investing and financing activities, net 496 (6 ) (490 ) — Net increase (decrease) in cash and cash equivalents (82 ) (5 ) 485 398 Cash and cash equivalents at beginning of year 199 7 856 1,062 Cash and cash equivalents at end of year $ 117 $ 2 $ 1,341 $ 1,460 CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS For the Year Ended September 30, 2013 Parent Guarantor Subsidiary Non-Guarantor Subsidiaries Total (In millions) Net cash provided by (used in) operating activities $ (70 ) $ 1 $ 808 $ 739 Cash flows from investing activities: Purchase of property and equipment — — (144 ) (144 ) Proceeds from sale and maturity of short-term investments 150 — 4 154 Purchase of short-term investments — — (4 ) (4 ) Proceeds from sale of investments 78 — 10 88 Other, net — — 2 2 Net cash provided by (used in) investing activities 228 — (132 ) 96 Cash flows from financing activities: Principal payments on long-term debt (250 ) — — (250 ) Proceeds from notes payable 275 — — 275 Principal payments on notes payable (275 ) — — (275 ) Payment of cash dividends (471 ) — — (471 ) Purchase of treasury stock (5 ) — — (5 ) Other, net 43 — (5 ) 38 Net cash used in financing activities (683 ) — (5 ) (688 ) Intercompany investing and financing activities, net 546 — (546 ) — Net increase in cash and cash equivalents 21 1 125 147 Cash and cash equivalents at beginning of year 178 6 731 915 Cash and cash equivalents at end of year $ 199 $ 7 $ 856 $ 1,062

Quarterly Data (Unaudited) (Tab

Quarterly Data (Unaudited) (Tables)	12 Months Ended
	Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Data	(Dollars in millions, except per share amounts) For the Fiscal Year Ended September 30, 2015 First Quarter Second Quarter Third Fourth Net revenues $ 819 $ 803 $ 794 $ 831 Operating income $ 344 $ 296 $ 325 $ 360 Net income $ 211 $ 189 $ 197 $ 216 Basic earnings per share $ 0.39 $ 0.35 $ 0.36 $ 0.40 Diluted earnings per share $ 0.39 $ 0.35 $ 0.36 $ 0.40 For the Fiscal Year Ended September 30, 2014 First Quarter Second Quarter Third Quarter Fourth Net revenues $ 752 $ 812 $ 763 $ 795 Operating income $ 307 $ 323 $ 316 $ 338 Net income $ 192 $ 194 $ 190 $ 211 Basic earnings per share $ 0.35 $ 0.35 $ 0.34 $ 0.39 Diluted earnings per share $ 0.35 $ 0.35 $ 0.34 $ 0.38 Quarterly amounts may not sum to fiscal year totals due to rounding.

Nature of Operations and Summ46

Nature of Operations and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Maturity period of cash equivalents (three months or less)	3 months
General maturity of the Company's reverse repurchase agreements which are collateralized by U.S. Treasury securities	7 days
The amount of impairment charges that have resulted from the goodwill annual impairment tests	$ 0	$ 0	$ 0
The amount of impairment charges that have resulted from the intangible assets annual impairment tests	$ 0	0	$ 0
Number of business days that client securities transactions generally settle within (in business days)	3 days
Payable to clients	$ 16,035,000,000	$ 14,497,000,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	700,000
Unamortized debt issuance costs	$ 12,000,000	$ 2,000,000
Minimum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated useful service life of acquired intangible assets, in years	3 years
Percent likelihood for tax benefit amounts to be realized upon settlement	50.00%
Minimum [Member] | All Other Depreciable Property and Equipment [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated useful service lives	3 years
Minimum [Member] | Building and Building Components [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated useful service lives	7 years
Maximum [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated useful service life of acquired intangible assets, in years	23 years
Maximum [Member] | All Other Depreciable Property and Equipment [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated useful service lives	7 years
Maximum [Member] | Building and Building Components [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Estimated useful service lives	40 years
Amerivest Investment Program [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Payable to clients	$ 7,000,000
Deferred advisory fee revenue	$ 3,000,000

Cash and Cash Equivalents - Sum

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,978	$ 1,460	$ 1,062	$ 915
Corporate [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	1,069	298
Broker-dealer subsidiaries [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	721	1,090
Futures commission merchant subsidiary [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	72	0
Trust company subsidiary [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	77	53
Investment advisory subsidiaries [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 39	$ 19

Cash and Investments Segregat48

Cash and Investments Segregated and on Deposit for Regulatory Purposes (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and investments segregated and on deposit for regulatory purposes	$ 6,305	$ 5,116
U.S. Government Debt Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and investments segregated and on deposit for regulatory purposes	3,706	3,070
Reverse Repurchase Agreements (collateralized by U.S. government debt securities) [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and investments segregated and on deposit for regulatory purposes	1,586	1,193
Cash in Demand Deposit Accounts [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and investments segregated and on deposit for regulatory purposes	802	617
Cash on Deposit with Futures Commission Merchants [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and investments segregated and on deposit for regulatory purposes	136	186
U.S. Government Debt Securities on Deposit with Futures Commission Merchant [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and investments segregated and on deposit for regulatory purposes	$ 75	$ 50

Receivable from and Payable t49

Receivable from and Payable to Brokers, Dealers and Clearing Organizations - Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Receivable:
Deposits paid for securities borrowed	$ 664	$ 995
Broker-dealers	2	3
Clearing organizations	190	104
Securities failed to deliver	6	6
Total	862	1,108
Payable:
Deposits received for securities loaned	2,653	2,384
Broker-dealers	1	3
Clearing organizations	19	23
Securities failed to receive	34	11
Total	$ 2,707	$ 2,421

Allowance for Doubtful Accoun50

Allowance for Doubtful Accounts on Client and Other Receivables (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Valuation and Qualifying Accounts [Abstract]
Beginning balance	$ 10	$ 15	$ 21
Provision for (recovery of) doubtful accounts, net	6	3	(1)
Write-off of doubtful accounts	(4)	(8)	(5)
Ending balance	$ 12	$ 10	$ 15

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Abstract]
Building and building components	$ 268	$ 264
Computer equipment	233	220
Software	188	170
Leasehold improvements	161	156
Land	20	20
Other property and equipment	76	72
Property and equipment, gross	946	902
Less: Accumulated depreciation and amortization	(425)	(359)
Property and equipment at cost, net	$ 521	$ 543

Goodwill and Acquired Intangi52

Goodwill and Acquired Intangible Assets - Acquired Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,473	$ 1,473
Accumulated Amortization	(812)	(722)
Net Carrying Amount	661	751
Client relationships [Member]
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	1,228	1,228
Accumulated Amortization	(722)	(645)
Net Carrying Amount	506	583
Technology and content [Member]
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	99	99
Accumulated Amortization	(90)	(77)
Net Carrying Amount	9	22
Trademark license [Member]
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	146	146
Accumulated Amortization	0	0
Net Carrying Amount	$ 146	$ 146

Goodwill and Acquired Intangi53

Goodwill and Acquired Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense on acquired intangible assets	$ 90	$ 90	$ 91

Goodwill and Acquired Intangi54

Goodwill and Acquired Intangible Assets - Estimated Future Amortization Expense for Acquired Intangible Assets (Detail) $ in Millions	Sep. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 85
2,017	76
2,018	72
2,019	68
2,020	63
Thereafter (to 2025)	151
Total	$ 515

Notes Payable and Long-term D55

Notes Payable and Long-term Debt - Schedule of Notes Payable and Long-term Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Face Value		$ 1,219
Unamortized Discounts and Debt Issuance Costs		(2)
Fair Value Adjustment		32
Net Carrying Value		1,249
4.150% Senior Notes due 2014 [Member]
Debt Instrument [Line Items]
Face Value		500
5.600% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Face Value	$ 500
2.950% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Face Value	750
3.625% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Face Value	500
Notes Payable Parent Revolving Facility [Member]
Debt Instrument [Line Items]
Face Value		150
Net Carrying Value		150
Long-term Debt [Member]
Debt Instrument [Line Items]
Face Value	1,750	1,069
Unamortized Discounts and Debt Issuance Costs	(13)	(2)
Fair Value Adjustment	63	32
Net Carrying Value	1,800	1,099
Long-term Debt [Member] | 4.150% Senior Notes due 2014 [Member]
Debt Instrument [Line Items]
Face Value		500
Fair Value Adjustment		2
Net Carrying Value		502
Long-term Debt [Member] | 5.600% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Face Value	500	500
Unamortized Discounts and Debt Issuance Costs	(2)	(2)
Fair Value Adjustment	40	30
Net Carrying Value	538	528
Long-term Debt [Member] | 2.950% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Face Value	750
Unamortized Discounts and Debt Issuance Costs	(7)
Net Carrying Value	743
Long-term Debt [Member] | 3.625% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Face Value	500
Unamortized Discounts and Debt Issuance Costs	(4)
Fair Value Adjustment	23
Net Carrying Value	$ 519
Long-term Debt [Member] | Variable-rate Note due 2019 [Member]
Debt Instrument [Line Items]
Face Value		69
Net Carrying Value		$ 69

Notes Payable and Long-term D56

Notes Payable and Long-term Debt - Fiscal Year Maturities on Long-term Debt Outstanding (Detail) $ in Millions	Sep. 30, 2015USD ($)
Debt Disclosure [Abstract]
2,016	$ 0
2,017	0
2,018	0
2,019	0
2,020	500
Thereafter	1,250
Total	$ 1,750

Notes Payable and Long-term D57

Notes Payable and Long-term Debt - Summary of Senior Notes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,219
2014 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Offering Date		Nov. 25, 2009
Debt Instrument, Maturity Date		Dec. 1, 2014
Debt Instrument, Face Amount		$ 500
Debt Instrument, Interest Rate, Stated Percentage		4.15%
2019 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Offering Date	Nov. 25, 2009
Debt Instrument, Maturity Date	Dec. 1, 2019
Debt Instrument, Face Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	5.60%
2022 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Offering Date	Mar. 4, 2015
Debt Instrument, Maturity Date	Apr. 1, 2022
Debt Instrument, Face Amount	$ 750
Debt Instrument, Interest Rate, Stated Percentage	2.95%
2025 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Offering Date	Oct. 17, 2014
Debt Instrument, Maturity Date	Apr. 1, 2025
Debt Instrument, Face Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	3.625%

Notes Payable and Long-term D58

Notes Payable and Long-term Debt - Senior Notes and Secured Loan - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 15, 2014
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 1,219,000,000
5.600% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Senior Notes redemption price in percentage based on principal amount of Note	100.00%
Discount rate for redemption of Senior Notes principal and interest, comparable to U.S. Treasury rate plus basis points	0.35%
Debt Instrument, Face Amount	$ 500,000,000
2.950% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
2022 Notes Date That Determines Redemption Price	Feb. 1, 2022
Discount rate for redemption of Senior Notes principal and interest, comparable to U.S. Treasury rate plus basis points	0.15%
Debt Instrument, Face Amount	$ 750,000,000
3.625% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
2025 Notes Date That Determines Redemption Price	Jan. 1, 2025
Discount rate for redemption of Senior Notes principal and interest, comparable to U.S. Treasury rate plus basis points	0.25%
Debt Instrument, Face Amount	$ 500,000,000
2022 Notes and 2025 Notes [Member]
Debt Instrument [Line Items]
Senior Notes redemption price in percentage based on principal amount of Note	100.00%
Secured Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 69,000,000

Notes Payable and Long-term D59

Notes Payable and Long-term Debt - Fair Value Hedging - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2015USD ($)
2019 Notes and 2025 Notes [Member]
Debt Instrument [Line Items]
Weighted-average effective interest rate	2.04%
Pay Variable Interest Rate Swap [Member] | 2019 Notes and 2025 Notes [Member]
Debt Instrument [Line Items]
Notional amount of interest rate swaps on Notes	$ 500,000,000
Interest rate swap, variable rate basis	three-month LIBOR
Pay Variable Interest Rate Swap [Member] | 5.600% Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Variable interest rate on swaps in excess of LIBOR rate, percentage	2.3745%
Pay Variable Interest Rate Swap [Member] | 3.625% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Variable interest rate on swaps in excess of LIBOR rate, percentage	1.1022%

Notes Payable and Long-term D60

Notes Payable and Long-term Debt - Gains and Losses Resulting from Changes in Fair Value of Interest Rate Swaps and Hedged Fixed Rate Debt (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Debt Disclosure [Abstract]
Gain (loss) on fair value of interest rate swaps	$ 31	$ (20)	$ (44)
Gain (loss) on fair value of hedged fixed-rate debt	(31)	20	44
Net gain (loss) recorded in interest on borrowings	$ 0	$ 0	$ 0

Notes Payable and Long-term D61

Notes Payable and Long-term Debt - Cash Flow Hedging - Additional Information (Details) - USD ($) $ in Millions	Jan. 17, 2014	Sep. 30, 2015	Oct. 17, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Face Value				$ 1,219
Forward Starting Interest Rate Swap [Member]
Debt Instrument [Line Items]
Forward-starting interest rate swap contract settlement date range - start	Jan. 17, 2014
Aggregate notional amount of forward-starting interest rate swap contracts	$ 500
Amount Paid To Settle Forward Starting Interest Rate Swap Contracts			$ 45
Loss on Cash Flow Hedge Ineffectiveness		$ 0.5
Amount of Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		$ 4.4
Description of Reclassification of Interest Rate Cash Flow Hedge Gain (Loss)		12 months
3.625% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Face Value		$ 500

Notes Payable and Long-term D62

Notes Payable and Long-term Debt - Effective Portion of Cash Flow Hedge (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Forward Starting Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (15)	$ (29)	$ 0

Notes Payable and Long-term D63

Notes Payable and Long-term Debt - Fair Value of Outstanding Derivatives Designated as Hedging Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Derivatives recorded under the caption Other assets
Pay-variable interest rate swaps designated as fair value hedges	$ 63	$ 32
Derivatives recorded under the caption Accounts Payable And Other Liabilities
Forward-starting interest rate swaps designated as cash flow hedges	$ 0	$ (29)

Notes Payable and Long-term D64

Notes Payable and Long-term Debt - Balance Sheet Impact of Hedging Instruments - Additional Information (Details) - Cash [Member] - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Forward Starting Interest Rate Swap [Member]
Debt Instrument [Line Items]
Pledged Collateral To The Interest Rate Swap Counterparty		$ 43
Pay Variable Interest Rate Swap [Member]
Debt Instrument [Line Items]
Pledged Collateral From Interest Rate Swap Counter Party Aggregate Fair Value	$ 77	$ 47

Notes Payable and Long-term D65

Notes Payable and Long-term Debt - Credit Agreements - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 11, 2014
Debt Instrument [Line Items]
Notes payable	$ 0	$ 150,000,000
TD Ameritrade Holding Corporation [Member]
Debt Instrument [Line Items]
Notes payable		$ 150,000,000
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date	Jun. 11, 2014
Line of credit facility maximum borrowing capacity			$ 300,000,000
Line of credit facility expiration date	Jun. 11, 2019
Interest rate margin	1.00%
Debt instrument basis spread on variable rate	one-month LIBOR	one-month LIBOR
Line of Credit Facility, Commitment Fee Percentage	0.15%	0.15%
Notes payable	$ 0	$ 150,000,000
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.10%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.25%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate margin	0.50%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin	1.25%	1.25%
Senior unsecured revolving credit facility, interest rate at period end		1.40%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate margin	0.875%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate margin	1.75%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate margin	0.25%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate margin	0.00%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Holding Corporation [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate margin	0.75%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date	Jun. 11, 2014
Line of credit facility maximum borrowing capacity			$ 300,000,000
Line of credit facility expiration date	Jun. 11, 2019
Line of Credit Facility, Commitment Fee Percentage	0.125%
Notes payable	$ 0	$ 0
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.08%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.20%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate margin	1.00%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | Federal Funds Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate margin	0.75%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | Federal Funds Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate margin	1.50%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate margin	1.00%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate margin	0.75%
Senior Unsecured Revolving Credit Facility [Member] | TD Ameritrade Clearing, Inc. [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate margin	1.50%
Intercompany Credit Agreements [Member]
Debt Instrument [Line Items]
Borrowings outstanding under intercompany credit agreements	$ 0
Intercompany Credit Agreements [Member] | TD Ameritrade Clearing, Inc. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date	Mar. 31, 2015
Line of credit facility maximum borrowing capacity	$ 700,000,000
Line of credit facility expiration date	Mar. 1, 2022
Line of Credit Facility Maximum Lending Capacity	$ 300,000,000
Intercompany Credit Agreements [Member] | TD Ameritrade, Inc. [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date	Mar. 31, 2015
Line of credit facility maximum borrowing capacity	$ 50,000,000
Line of credit facility expiration date	Mar. 1, 2022
Line of Credit Facility Maximum Lending Capacity	$ 300,000,000
Intercompany Credit Agreements [Member] | TD Ameritrade Futures & Forex LLC [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date	Mar. 29, 2015
Debt Instrument, Term	5 years
Prior Notice Of Intent To Terminate	30 days
Line of Credit Facility Percentage Of Residual Interest Target	75.00%
Line of Credit Facility Residual Interest Target	$ 18,000,000
Line of Credit Facility, Current Borrowing Capacity	$ 13,500,000
Line Of Credit Facility Calendar Days After Borrowing Date Loans Due	60 days
Intercompany Credit Agreements [Member] | TD Ameritrade Futures & Forex LLC [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Interest rate margin	1.00%

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Current expense :
Federal	$ 470	$ 457	$ 370
State	28	53	33
Total	498	510	403
Deferred expense (benefit):
Federal	(22)	(28)	(2)
State	(1)	1	12
Total	(23)	(27)	10
Provision for income taxes	$ 475	$ 483	$ 413

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Federal Statutory Tax Rate to Effective Tax Rate (Detail)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax effect	3.00%	3.10%	2.60%
Adjustments to estimated state income taxes	0.10%	0.20%	0.40%
Interest recorded (reversed) on unrecognized tax benefits, net	(0.10%)	0.20%	0.30%
Reversal of accruals for unrecognized tax benefits	(1.10%)	(0.50%)	(0.30%)
Effective income tax rate	36.90%	38.00%	38.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Line Items]
Effective income tax rate	36.90%	38.00%	38.00%
Favorable resolutions of certain income tax matters	$ 22	$ 10	$ 6
Unfavorable deferred income tax adjustments		$ 2	4
Favorable per share impact on earnings	$ 0.04	$ 0.01
Federal net operating loss carryover acquired in thinkorswim acquisition	$ 3
Federal net operating loss carryover acquired in thinkorswim acquisition, expiration year	2,019
Subsidiaries state operating loss carryforwards	$ 83
Decrease in the valuation allowance	5
Unrecognized tax benefits	154	$ 165	137	$ 139
Unrecognized tax benefits net of federal benefit on state matters	100	107
Unrecognized tax benefits net of federal benefit on state matters that would Impact effective tax rate	$ 100	107
Statute of Limitations Period, Minimum (In years)	3 years
Statute of Limitations Period, Maximum (In years)	4 years
Reasonably possible reduction in unrecognized tax benefits	$ 41
Reasonably possible reduction in unrecognized tax benefits net of federal benefit on state matters	27
Interest and penalties expense (benefit) recognized	(2)	3	$ 2
Accrued interest and penalties related to unrecognized tax benefits	$ 49	$ 53
Minimum [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards, Expiration Date	Sep. 30, 2016
Federal return years that remain open under the statute of limitations	2,012
Maximum [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards, Expiration Date	Sep. 30, 2034
Federal return years that remain open under the statute of limitations	2,014

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Deferred tax assets:
Accrued and other liabilities	$ 76	$ 78
Intangible assets, state tax benefit	7	10
Stock-based compensation	37	37
Allowance for doubtful accounts	5	5
Operating loss carryforwards	7	12
Unrealized loss on cash flow hedging instruments	15	11
Other deferred tax assets	1	0
Gross deferred tax assets	148	153
Less: Valuation allowance	(4)	(9)
Net deferred tax assets	144	144
Deferred tax liabilities:
Acquired intangible assets	(387)	(410)
Property and equipment	(39)	(42)
Other deferred tax liabilities	(5)	(6)
Total deferred tax liabilities	(431)	(458)
Net deferred tax liabilities	$ (287)	$ (314)

Income Taxes - Reconciliation70

Income Taxes - Reconciliation of Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Beginning balance	$ 165	$ 137	$ 139
Additions based on tax positions related to the current year	16	29	8
Additions for tax positions of prior years	5	10	2
Reductions for tax positions of prior years	(4)	(1)	(5)
Reductions due to settlements with taxing authorities	(21)	0	(1)
Reductions due to lapsed statute of limitations	(7)	(10)	(6)
Ending balance	$ 154	$ 165	$ 137

Capital Requirements - Net Capi

Capital Requirements - Net Capital and Net Capital Requirements for Company's Subsidiaries (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
TD Ameritrade Clearing, Inc. [Member]
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Net Capital	$ 1,581	$ 1,569
Required Net Capital	310	280
Excess Net Capital	1,271	1,289
Net Capital in Excess of Early Warning Threshold	$ 807	$ 868
Ratio of Net Capital to Aggregate Debit Balances	10.22%	11.19%
TD Ameritrade, Inc. [Member]
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Net Capital	$ 228	$ 347
Required Net Capital	0	17
Excess Net Capital	228	330
Net Capital in Excess of Early Warning Threshold	227	$ 328
TD Ameritrade Futures & Forex LLC [Member]
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Net Capital under Commodity Exchange Act	90
Required Net Capital under Commodity Exchange Act	12
Net Capital in Excess of Required Net Capital	78
Net Capital in Excess of Early Warning Threshold	$ 78

Capital Requirements - Addition

Capital Requirements - Additional Information (Detail) - USD ($)	Sep. 30, 2015	Sep. 30, 2014
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Percentage of net capital to aggregate debit balances required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or make any unsecured advances or loans to its parent company or employees	5.00%
Percentage of net capital to the Company's risk based capital requirement required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or make any unsecured advances or loans to its parent company or employees	110.00%
Percentage of net capital to the Company's minimum dollar requirement required for a broker-dealer to repay subordinated borrowings, pay cash dividends, or make any unsecured advances or loans to its parent company or employees	120.00%
Percentage of net capital to the Company's risk-based capital requirement required for a futures commission merchant to provide notice to its regulator	110.00%
Percentage of net capital to the Company's minimum dollar requirement required for a futures commission merchant to provide notice to its regulator	150.00%
TD Ameritrade Trust Company's Tier 1 capital	$ 32,000,000	$ 27,000,000
Amount in excess of required Tier 1 capital	17,000,000	12,000,000
TD Ameritrade Clearing, Inc. [Member]
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Minimum net capital required	$ 1,500,000
Percentage of aggregate debit balances required as minimum net capital	2.00%
TD Ameritrade, Inc. [Member]
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Minimum net capital required	$ 250,000	$ 250,000
Percentage of aggregate debit balances required as minimum net capital	2.00%	2.00%
Net capital required under Regulation 1.17 of the Commodity Exchange Act		$ 1,000,000
Minimum percentage of the total risk margin requirements for all positions carried in non-client accounts to be added to the minimum percentage of the total risk margin requirements for all positions carried in client accounts for minimum net capital calculation		8.00%
Minimum percentage of the total risk margin requirements for all positions carried in client accounts to be added to the minimum percentage of the total risk margin requirements for all positions carried in non-client accounts for minimum net capital calculation		8.00%
TD Ameritrade Futures & Forex LLC [Member]
Net Capital and Net Capital Requirements For Company's Subsidiaries [Line Items]
Net capital required under Regulation 1.17 of the Commodity Exchange Act	$ 1,000,000
Minimum percentage of the total risk margin requirements for all positions carried in non-client accounts to be added to the minimum percentage of the total risk margin requirements for all positions carried in client accounts for minimum net capital calculation	8.00%
Minimum percentage of the total risk margin requirements for all positions carried in client accounts to be added to the minimum percentage of the total risk margin requirements for all positions carried in non-client accounts for minimum net capital calculation	8.00%

Stock-based Compensation - Summ

Stock-based Compensation - Summary of Option Activity in Stock Incentive Plans (Detail) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Options, Outstanding at beginning of year (in shares)	2,136
Number of Options, Exercised (in shares)	(849)
Number of Options, Expired (in shares)	(1)
Number of Options, Outstanding at end of year (in shares)	1,286
Number of Options, Exercisable at end of year (in shares)	1,286
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ / shares	$ 18.43
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	17.98
Weighted Average Exercise Price, Expired (in dollars per share) | $ / shares	37.08
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ / shares	18.71
Weighted Average Exercise Price, Exercisable at end of year (in dollars per share) | $ / shares	$ 18.71
Weighted Average Remaining Contractual Term, Outstanding at end of year (in years)	2 years 8 months 23 days
Weighted Average Remaining Contractual Term, Exercisable at end of year (in years)	2 years 8 months 23 days
Aggregate Intrinsic Value, Outstanding at end of year (in dollars) | $	$ 17
Aggregate Intrinsic Value, Exercisable at end of year (in dollars) | $	$ 17

Stock-based Compensation - Su74

Stock-based Compensation - Summary of Restricted Stock Units Activity in Stock Incentive Plans (Detail) shares in Thousands	12 Months Ended
	Sep. 30, 2015$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Units, Nonvested at beginning of year	4,832
Number of Units, Granted	1,207
Number of Units, Dividend equivalents	70
Number of Units, Vested	(1,787)
Number of Units, Forfeited	(110)
Number of Units, Nonvested at end of year	4,212
Weighted Average Grant Date Fair Value, Nonvested at beginning of year (in dollars per share) | $ / shares	$ 19.57
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares	34.34
Weighted Average Grant Date Fair Value, Dividend equivalents (in dollars per share) | $ / shares	23.18
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares	17.02
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares	25.28
Weighted Average Grant Date Fair Value, Nonvested at end of year (in dollars per share) | $ / shares	$ 24.79

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2015USD ($)stock_incentive_planshares	Sep. 30, 2014USD ($)shares	Sep. 30, 2013USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans | stock_incentive_plan	2
Stock-based compensation expense	$ 36,000,000	$ 32,000,000	$ 29,000,000
Income tax benefits	$ 14,000,000	$ 12,000,000	$ 11,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of stock options from grant date	10 years
Number of options granted | shares	0	0	0
Total intrinsic value of options exercised	$ 11,000,000	$ 6,000,000	$ 65,000,000
Unrecognized compensation cost related to nonvested stock option awards	$ 0
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs related to nonvested stock-based compensation awards	$ 31,000,000
Weighted average period of recognition of unrecognized compensation cost related to nonvested stock-based compensation awards	1 year 10 months 18 days
Fair Value of RSUs vested in period	$ 59,000,000	$ 48,000,000	$ 15,000,000
Restricted Stock Units (RSUs) [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) [Member] | Non-employee directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's common stock reserved for issuance to employee | shares	42,104,174
2006 Directors Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's common stock reserved for issuance to employee | shares	1,830,793

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]
Profit-sharing and matching contributions expense	$ 34	$ 30	$ 28

Commitments and Contingencies -

Commitments and Contingencies - Future Minimum Rental Commitments Under Non-Cancelable Operating Leases (Detail) $ in Millions	Sep. 30, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
Minimum Lease Payments 2016	$ 54
Minimum Lease Payments 2017	54
Minimum Lease Payments 2018	52
Minimum Lease Payments 2019	49
Minimum Lease Payments 2020	39
Minimum Lease Payments Thereafter (to 2030)	70
Total Minimum Lease Payments	318
Sublease Income 2016	(2)
Sublease Income 2017	(2)
Sublease Income 2018	(1)
Sublease Income 2019	(1)
Sublease Income 2020	0
Sublease Income Thereafter (to 2030)	0
Total Sublease Income	(6)
Net Lease Commitments 2016	52
Net Lease Commitments 2017	52
Net Lease Commitments 2018	51
Net Lease Commitments 2019	48
Net Lease Commitments 2020	39
Net Lease Commitments Thereafter (to 2030)	70
Total Net Lease Commitments	$ 312

Commitments and Contingencies78

Commitments and Contingencies - Additional Information (Detail)	Mar. 26, 2015USD ($)	Sep. 30, 2015USD ($)litigation_cases	Sep. 30, 2014USD ($)	Sep. 30, 2013USD ($)	Sep. 30, 2008$ / shares
Contingencies And Commitments [Line Items]
Rental expense, net of sublease income		$ 49,000,000	$ 49,000,000	$ 54,000,000
Order Routing Litigation Cases Total (in number of cases) | litigation_cases		5
Yield Plus Fund's stated objective to maintain a per share net asset value | $ / shares					$ 1
Company cash contribution toward class settlement fund	$ 3,750,000
Contingent liability for guarantees to securities clearinghouses and exchanges		$ 0	$ 0
Minimum [Member]
Contingencies And Commitments [Line Items]
Aggregate range of reasonably possible losses in excess of amounts accrued		0
Maximum [Member]
Contingencies And Commitments [Line Items]
Aggregate range of reasonably possible losses in excess of amounts accrued		$ 50,000,000

Commitments and Contingencies79

Commitments and Contingencies - Collateral Available, Loaned or Repledged (Detail) - USD ($) $ in Billions	Sep. 30, 2015	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Client margin securities	$ 17.7	$ 16.2
Stock borrowings	0.7	1
Total collateral available	18.4	17.2
Collateral loaned	2.7	2.4
Collateral repledged	3.8	2.5
Total collateral loaned or repledged	$ 6.5	$ 4.9

Commitments and Contingencies80

Commitments and Contingencies - Summary of Cash Deposited with and Securities Pledged to Clearinghouses (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Cash Deposited with and Securities Pledged to Clearinghouses [Line Items]
Cash deposited and securities pledged	$ 540	$ 285
Cash [Member]
Cash Deposited with and Securities Pledged to Clearinghouses [Line Items]
Cash deposited and securities pledged	190	104
U.S. Government Debt Securities [Member]
Cash Deposited with and Securities Pledged to Clearinghouses [Line Items]
Cash deposited and securities pledged	$ 350	$ 181

Fair Value Disclosures - Fair V

Fair Value Disclosures - Fair Value Hierarchy for Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Assets
Cash equivalents	$ 1,978	$ 1,460	$ 1,062	$ 915
Investments segregated for regulatory purposes	6,305	5,116
Securities owned	425	332
Liabilities
Accounts payable and accrued liabilities	637	595
Fair Value, Measurements, Recurring [Member]
Assets
Securities owned	425	332
Other assets	68	37
Total assets at fair value	6,162	4,773
Liabilities
Total liabilities at fair value		30
Fair Value, Measurements, Recurring [Member] | Money Market Mutual Funds [Member]
Assets
Cash equivalents	1,888	1,284
Fair Value, Measurements, Recurring [Member] | U.S. Government Debt Securities [Member]
Assets
Investments segregated for regulatory purposes	3,781	3,120
Securities owned	415	326
Other assets	4	4
Fair Value, Measurements, Recurring [Member] | Money Market And Other Mutual Funds [Member]
Assets
Securities owned	2	1
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
Assets
Securities owned	8	5
Fair Value, Measurements, Recurring [Member] | Pay Variable Interest Rate Swap [Member]
Assets
Other assets	63	32
Fair Value, Measurements, Recurring [Member] | Auction Rate Securities [Member]
Assets
Other assets	1	1
Fair Value, Measurements, Recurring [Member] | Forward Starting Interest Rate Swap [Member]
Liabilities
Accounts payable and accrued liabilities		29
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Liabilities
Accounts payable and accrued liabilities	23	1
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Securities owned	3	2
Total assets at fair value	1,891	1,286
Liabilities
Total liabilities at fair value		1
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Mutual Funds [Member]
Assets
Cash equivalents	1,888	1,284
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
Assets
Securities owned	3	2
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Liabilities
Accounts payable and accrued liabilities	23	1
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Securities owned	420	329
Other assets	67	36
Total assets at fair value	4,268	3,485
Liabilities
Total liabilities at fair value		29
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Debt Securities [Member]
Assets
Investments segregated for regulatory purposes	3,781	3,120
Securities owned	415	326
Other assets	4	4
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
Assets
Securities owned	5	3
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Pay Variable Interest Rate Swap [Member]
Assets
Other assets	63	32
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Starting Interest Rate Swap [Member]
Liabilities
Accounts payable and accrued liabilities		29
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Securities owned	2	1
Other assets	1	1
Total assets at fair value	3	2
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Money Market And Other Mutual Funds [Member]
Assets
Securities owned	2	1
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Auction Rate Securities [Member]
Assets
Other assets	$ 1	$ 1

Fair Value Disclosures - Additi

Fair Value Disclosures - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Fair Value Disclosures [Abstract]
Maximum range of cash and cash equivalents original maturity	3 months
Reverse repurchase agreements generally have a maturity	7 days
Aggregate estimated fair value of the Senior Notes	$ 1,833	$ 1,081
Debt Instrument [Line Items]
Long-term debt	1,800	1,099
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,800	1,030
Secured Loan [Member]
Debt Instrument [Line Items]
Long-term debt		$ 69

Offsetting Assets and Liabili83

Offsetting Assets and Liabilities - Effect of Rights of Setoff Associated with Company's Recognized Assets and Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Offsetting Assets And Liabilities [Line Items]
Deposits paid for securities borrowed, net of balance sheet presentation	$ 700	$ 1,000
Total recognized assets, gross	2,313	2,220
Total recognized assets, offset in the balance sheet	0	0
Total recognized assets, net balance sheet presentation	2,313	2,220
Total recognized assets, gross amount of financial instruments not offset in the balance sheet	(70)	(69)
Total recognized assets, gross amounts of collateral received (including cash) not offset in the balance sheet	(2,234)	(2,125)
Total recognized assets, net of collateral	9	26
Deposits received for securities loaned, gross	2,653
Deposits received for securities loaned, net balance sheet presentation	2,700	2,400
Total recognized liabilities, gross		2,413
Total recognized liabilities, offset in balance sheet		0
Total recognized liabilities, net balance sheet presentation		2,413
Total recognized liabilities, gross amount of financial instruments not offset in the balance sheet		(69)
Total recognized liabilities, gross amounts of collateral pledged (including cash) not offset in the balance sheet		(2,044)
Total recognized liabilities, net of collateral		300
Investments segregated for regulatory purposes [Member]
Offsetting Assets And Liabilities [Line Items]
Reverse repurchase agreements, gross	1,586	1,193
Reverse repurchase agreements, offset in balance sheet	0	0
Reverse repurchase agreements, net balance sheet presentation	1,586	1,193
Reverse repurchase agreements, gross amount of financial instruments not offset in the balance sheet	0	0
Reverse repurchase agreements, gross amounts of collateral received (including cash) not offset in the balance sheet	(1,586)	(1,193)
Reverse repurchase agreements, net of collateral	0	0
Receivable from brokers, dealers and clearing organizations [Member]
Offsetting Assets And Liabilities [Line Items]
Deposits paid for securities borrowed, gross	664	995
Deposits paid for securities borrowed, offset in balance sheet	0	0
Deposits paid for securities borrowed, net of balance sheet presentation	664	995
Deposits paid for securities borrowed, gross amount of financial instruments not offset in the balance sheet	(70)	(69)
Deposits paid for securities borrowed, gross amounts of collateral received (including cash) not offset in the balance sheet	(585)	(900)
Deposits paid for securities borrowed, net of collateral	9	26
Other assets [Member]
Offsetting Assets And Liabilities [Line Items]
Pay-variable interest rate swaps, gross	63	32
Pay-variable interest rate swaps, offset in balance sheet	0	0
Pay-variable interest rate swaps, net balance sheet presentation	63	32
Pay-variable interest rate swaps, gross amount of financial instruments not offset in the balance sheet	0	0
Pay-variable interest rate swaps, gross amounts of collateral received (including cash) not offset in the balance sheet	(63)	(32)
Pay-variable interest rate swaps, net of collateral	0	0
Payable to brokers, dealers and clearing organizations [Member]
Offsetting Assets And Liabilities [Line Items]
Deposits received for securities loaned, gross	2,653	2,384
Deposits received for securities loaned, offset in balance sheet	0	0
Deposits received for securities loaned, net balance sheet presentation	2,653	2,384
Deposits received for securities loaned, gross amount of financial instruments not offset in the balance sheet	(70)	(69)
Deposits received for securities loaned, gross amounts of collateral pledged (ncluding cash) not offset in the balance sheet	(2,364)	(2,015)
Deposits received for securities loaned, net of collateral	$ 219	300
Accounts payable and accrued liabilities [Member]
Offsetting Assets And Liabilities [Line Items]
Forward-starting interest rate swaps, gross		29
Forward-starting interest rate swaps, offset in balance sheet		0
Forward-starting interest rate swaps, net balance sheet presentation		29
Forward-starting interest rate swaps, gross amount of financial instruments not offset in the balance sheet		0
Forward-starting interest rate swaps, gross amount of collateral pledged (including cash) not offset in the balance sheet		(29)
Forward-starting interest rate swaps, net of collateral		$ 0

Offsetting Assets and Liabili84

Offsetting Assets and Liabilities Offsetting Assets and Liabilities - Disaggregation of Secured Lending Transactions (Details) $ in Millions	Sep. 30, 2015USD ($)
Disaggregation of Gross Securities Lending Transactions [Line Items]
Deposits received for securities loaned, gross	$ 2,653
Equity Securities [Member]
Disaggregation of Gross Securities Lending Transactions [Line Items]
Deposits received for securities loaned, gross	2,413
Exchange Traded Funds [Member]
Disaggregation of Gross Securities Lending Transactions [Line Items]
Deposits received for securities loaned, gross	150
Closed-end Funds [Member]
Disaggregation of Gross Securities Lending Transactions [Line Items]
Deposits received for securities loaned, gross	41
Other Securities [Member]
Disaggregation of Gross Securities Lending Transactions [Line Items]
Deposits received for securities loaned, gross	$ 49

Offsetting Assets and Liabili85

Offsetting Assets and Liabilities - Effect of Rights of Setoff Associated with Company's Recognized Assets and Liabilities Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Offsetting Assets And Liabilities [Line Items]
Gross amounts of deposits paid for securities borrowed	$ 664	$ 995
Gross amounts of deposits received for securities loaned	2,653	2,384
Fair value of collateral the Company has received under enforceable master agreements	2,350	2,231
Fair value of collateral the Company has pledged under enforceable master agreements	2,437	2,124
Transacted Through The Option Clearing Corporation [Member]
Offsetting Assets And Liabilities [Line Items]
Gross amounts of deposits paid for securities borrowed	332	616
Gross amounts of deposits received for securities loaned	$ 1,164	$ 754

Accumulated Other Comprehensi86

Accumulated Other Comprehensive Income (Loss) Net Change (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Available-for-sale Securities [Abstract]
Net unrealized gain	$ 0	$ 0	$ 21
Net unrealized gain, tax effect	0	0	(8)
Net unrealized gain, net of tax	0	0	13
Reclassification adjustment for net realized gain included in net income	0	0	(52)
Reclassification adjustment for net realized gain included in net income, tax effect	0	0	19
Reclassification adjustment for net realized gain included in net income, net of tax	0	0	(33)
Reclassification of impairment charge	0	0	3
Reclassification of impairment charge, tax effect	0	0	(1)
Reclassification of impairment charge, net of tax	0	0	2
Change in unrealized gain on investments available-for-sale	0	0	(28)
Change in unrealized gain on investments available-for-sale, tax effect	0	0	10
Change in unrealized gain on investments available-for-sale, net of tax	0	0	(18)
Cash Flow Hedging Instruments [Abstract]
Net unrealized loss	(15)	(29)	0
Net unrealized loss, tax effect	5	11	0
Net unrealized loss, net of tax	(10)	(18)	0
Reclassification adjustment for portion of realized loss amortized to net income	4	0	0
Reclassification adjustment for portion of realized loss amortized to net income, tax effect	(1)	0	0
Reclassification adjustment for portion of realized loss amortized to net income, net of tax	3	0	0
Change in unrealized loss on cash flow hedging instruments	(11)	(29)	0
Change in unrealized loss on cash flow hedging instruments, tax effect	4	11	0
Change in unrealized loss on cash flow hedging instruments, net of tax	(7)	(18)	0
Total other comprehensive loss, before tax	(11)	(29)	(28)
Income tax effect	4	11	10
Total other comprehensive loss, net of tax	$ (7)	$ (18)	$ (18)

Accumulated Other Comprehensi87

Accumulated Other Comprehensive Income (Loss) Balance Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) Balance Rollforward [Line Items]
Beginning balance	$ (18)	$ 0	$ 18
Other comprehensive income (loss), before reclassifications	(10)	(18)	13
Amounts reclassified from accumulated other comprehensive income (loss)	3	0	(31)
Total other comprehensive loss, net of tax	(7)	(18)	(18)
Ending balance	(25)	(18)	0
Investments Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) Balance Rollforward [Line Items]
Beginning balance	0	0	18
Other comprehensive income (loss), before reclassifications	0	0	13
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	(31)
Total other comprehensive loss, net of tax	0	0	(18)
Ending balance	0	0	0
Forward Starting Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) Balance Rollforward [Line Items]
Beginning balance	(18)	0	0
Other comprehensive income (loss), before reclassifications	(10)	(18)	0
Amounts reclassified from accumulated other comprehensive income (loss)	3	0	0
Total other comprehensive loss, net of tax	(7)	(18)	0
Ending balance	$ (25)	$ (18)	$ 0

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2015USD ($)board_of_directors_memberComponent	Sep. 30, 2014USD ($)
Related Party Transaction [Line Items]
Toronto-Dominion Bank percentage of ownership in the Company	42.00%
Toronto-Dominion Bank's right to designate to the Company's board of directors | board_of_directors_member	5
Board of Directors Total Members | board_of_directors_member	12
Adjustments required to adjust variable rate leg of interest rate swaps under current IDA Agreement	1 month
Contingent liability carried on the consolidated balance sheets for the Insured Deposit Account Agreement	$ 0	$ 0
Insured Deposit Account Agreement Fee Example [Member]
Related Party Transaction [Line Items]
Amount of deposits, in the insured deposit account agreement fee example	$ 100,000,000
Term of deposits invested in fixed rate investments, in the insured deposit account agreement fee example	5 years
Term of fixed rate investments that deposits are invested in, in the insured deposit account agreement fee example	5 years
Fixed yield for applicable LIBOR-based swaps, in the insured deposit account agreement fee example	1.45%
Gross fixed yield earned on deposits, in the insured deposit account agreement fee example	1.45%
Current IDA Agreement [Member]
Related Party Transaction [Line Items]
Agreement effective date	Jan. 1, 2013
Agreement expiration date	Jul. 1, 2018
Agreement successive renewal terms	5 years
Prior written notice period for termination of agreement by any party	2 years
Number Of Primary Components Of Fee Earned On Ida Agreement | Component	2
Percentage of fixed rate notional investments	74.00%
Percentage of floating rate investments	26.00%
Deposit amount threshold for floating-rate or fixed-rate notional investments with a maturity of up to 24 months subject to servicing fee adjustment	$ 20,000,000,000
Current IDA Agreement [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Servicing fee percentage (in basis points)	0.25%
Short-term fixed-rate notional investments maturity	24 months
Current IDA Agreement [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Servicing fee percentage (in basis points)	0.03%
Current IDA Agreement [Member] | New Fixed Rate Notional Investments [Member]
Related Party Transaction [Line Items]
Event 1 Federal Funds effective rate minimum	0.75%
Term of U.S. dollar interest rate swaps	5 years
Event 2 Minimum Rate on five-year U.S. dollar interest rate swaps for 20 consecutive business days	1.50%
Event 2 number of consecutive business days required above the minimum rate on U.S. dollar interest rate swaps for reduction in rate earned by Company in the case of Event 1 and Event 2	20 days
The percentage used in the calculation to reduce the rate earned by the Company on new fixed-rate notional investments in the case of event 1 and event 2	20.00%
Maximum reduction to rate earned by Company in the case of event 1 and event 2	0.10%

Related Party Transactions - Su

Related Party Transactions - Summary of Revenues Resulting from Transactions with Related Parties (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction [Line Items]
Revenues from TD and Affiliates	$ 858	$ 837	$ 821
Insured Deposit Account Fees [Member] | Insured Deposit Account Agreement [Member]
Related Party Transaction [Line Items]
Revenues from TD and Affiliates	839	820	804
Various [Member] | Referral and Strategic Alliance Agreement [Member]
Related Party Transaction [Line Items]
Revenues from TD and Affiliates	13	12	11
Various [Member] | Other [Member]
Related Party Transaction [Line Items]
Revenues from TD and Affiliates	$ 6	$ 5	$ 6

Related Party Transactions - 90

Related Party Transactions - Summary of Expenses Resulting from Transactions with Related Parties (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction [Line Items]
Expenses to TD and Affiliates	$ 22	$ 20	$ 23
Professional Services [Member] | Canadian Call Center Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses to TD and Affiliates	18	17	19
Various [Member] | Other [Member]
Related Party Transaction [Line Items]
Expenses to TD and Affiliates	$ 4	$ 3	$ 4

Related Party Transactions - 91

Related Party Transactions - Summary of Classification and Amount of Receivables from and Payables to Affiliates of Company (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Assets:
Receivable from brokers, dealers and clearing organizations	$ 862	$ 1,108
Receivable from affiliates	93	99
Liabilities:
Payable to brokers, dealers and clearing organizations	2,707	2,421
Payable to affiliates	6	5
Related Party Assets [Member]
Assets:
Receivable from brokers, dealers and clearing organizations	0	1
Receivable from affiliates	93	99
Related Party Liabilities [Member]
Liabilities:
Payable to brokers, dealers and clearing organizations	70	96
Payable to affiliates	$ 6	$ 5

Condensed Consolidating Finan92

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 1,978	$ 1,460	$ 1,062	$ 915
Cash and investments segregated and on deposit for regulatory purposes	6,305	5,116
Receivable from brokers, dealers and clearing organizations	862	1,108
Receivable from clients, net	12,770	11,639
Investments in subsidiaries	0	0
Receivable from affiliates	93	99
Goodwill	2,467	2,467
Acquired intangible assets, net	661	751
Other, net	1,239	1,189
Total assets	26,375	23,829
Liabilities:
Payable to brokers, dealers and clearing organizations	2,707	2,421
Payable to clients	16,035	14,497
Accounts payable and accrued liabilities	637	595
Payable to affiliates	6	5
Notes payable	0	150
Long-term debt	1,800	1,099
Deferred income taxes	287	314
Total liabilities	21,472	19,081
Stockholders' equity	4,903	4,748	4,676	4,425
Total liabilities and stockholders' equity	26,375	23,829
TD Ameritrade Holding Corporation [Member]
ASSETS
Cash and cash equivalents	920	117	199	178
Cash and investments segregated and on deposit for regulatory purposes	0	0
Receivable from brokers, dealers and clearing organizations	0	0
Receivable from clients, net	0	0
Investments in subsidiaries	5,762	5,868
Receivable from affiliates	6	11
Goodwill	0	0
Acquired intangible assets, net	0	0
Other, net	145	154
Total assets	6,833	6,150
Liabilities:
Payable to brokers, dealers and clearing organizations	0	0
Payable to clients	0	0
Accounts payable and accrued liabilities	130	153
Payable to affiliates	0	0
Notes payable		150
Long-term debt	1,800	1,099
Deferred income taxes	0	0
Total liabilities	1,930	1,402
Stockholders' equity	4,903	4,748
Total liabilities and stockholders' equity	6,833	6,150
Guarantor Subsidiary [Member]
ASSETS
Cash and cash equivalents	2	2	7	6
Cash and investments segregated and on deposit for regulatory purposes	0	0
Receivable from brokers, dealers and clearing organizations	0	0
Receivable from clients, net	0	0
Investments in subsidiaries	5,648	5,754
Receivable from affiliates	1	2
Goodwill	0	0
Acquired intangible assets, net	146	146
Other, net	18	16
Total assets	5,815	5,920
Liabilities:
Payable to brokers, dealers and clearing organizations	0	0
Payable to clients	0	0
Accounts payable and accrued liabilities	0	0
Payable to affiliates	0	0
Notes payable		0
Long-term debt	0	0
Deferred income taxes	53	52
Total liabilities	53	52
Stockholders' equity	5,762	5,868
Total liabilities and stockholders' equity	5,815	5,920
Non-Guarantor Subsidiaries [Member]
ASSETS
Cash and cash equivalents	1,056	1,341	$ 856	$ 731
Cash and investments segregated and on deposit for regulatory purposes	6,305	5,116
Receivable from brokers, dealers and clearing organizations	862	1,108
Receivable from clients, net	12,770	11,639
Investments in subsidiaries	0	0
Receivable from affiliates	92	97
Goodwill	2,467	2,467
Acquired intangible assets, net	515	605
Other, net	1,138	1,073
Total assets	25,205	23,446
Liabilities:
Payable to brokers, dealers and clearing organizations	2,707	2,421
Payable to clients	16,035	14,497
Accounts payable and accrued liabilities	523	455
Payable to affiliates	12	16
Notes payable		0
Long-term debt	0	0
Deferred income taxes	280	303
Total liabilities	19,557	17,692
Stockholders' equity	5,648	5,754
Total liabilities and stockholders' equity	25,205	23,446
Eliminations [Member]
ASSETS
Cash and cash equivalents	0	0
Cash and investments segregated and on deposit for regulatory purposes	0	0
Receivable from brokers, dealers and clearing organizations	0	0
Receivable from clients, net	0	0
Investments in subsidiaries	(11,410)	(11,622)
Receivable from affiliates	(6)	(11)
Goodwill	0	0
Acquired intangible assets, net	0	0
Other, net	(62)	(54)
Total assets	(11,478)	(11,687)
Liabilities:
Payable to brokers, dealers and clearing organizations	0	0
Payable to clients	0	0
Accounts payable and accrued liabilities	(16)	(13)
Payable to affiliates	(6)	(11)
Notes payable		0
Long-term debt	0	0
Deferred income taxes	(46)	(41)
Total liabilities	(68)	(65)
Stockholders' equity	(11,410)	(11,622)
Total liabilities and stockholders' equity	$ (11,478)	$ (11,687)

Condensed Consolidating Finan93

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Income (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Condensed Income Statements, Captions [Line Items]
Net revenues	$ 831	$ 794	$ 803	$ 819	$ 795	$ 763	$ 812	$ 752	$ 3,247	$ 3,123	$ 2,764
Operating expenses									1,922	1,838	1,708
Operating income	360	325	296	344	338	316	323	307	1,325	1,285	1,056
Other expense (income)									37	15	(32)
Income (loss) before income taxes and equity in income of subsidiaries									1,288	1,270	1,088
Provision for (benefit from) income taxes									475	483	413
Income (loss) before equity in income of subsidiaries									813	787	675
Equity in income of subsidiaries									0	0	0
Net income	$ 216	$ 197	$ 189	$ 211	$ 211	$ 190	$ 194	$ 192	813	787	675
TD Ameritrade Holding Corporation [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues									17	14	12
Operating expenses									16	13	10
Operating income									1	1	2
Other expense (income)									43	24	(23)
Income (loss) before income taxes and equity in income of subsidiaries									(42)	(23)	25
Provision for (benefit from) income taxes									(16)	(14)	8
Income (loss) before equity in income of subsidiaries									(26)	(9)	17
Equity in income of subsidiaries									839	796	658
Net income									813	787	675
Guarantor Subsidiary [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues									0	0	0
Operating expenses									0	0	0
Operating income									0	0	0
Other expense (income)									0	0	0
Income (loss) before income taxes and equity in income of subsidiaries									0	0	0
Provision for (benefit from) income taxes									(1)	(1)	0
Income (loss) before equity in income of subsidiaries									1	1	0
Equity in income of subsidiaries									838	787	634
Net income									839	788	634
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues									3,247	3,123	2,763
Operating expenses									1,923	1,839	1,709
Operating income									1,324	1,284	1,054
Other expense (income)									(6)	(9)	(9)
Income (loss) before income taxes and equity in income of subsidiaries									1,330	1,293	1,063
Provision for (benefit from) income taxes									492	498	405
Income (loss) before equity in income of subsidiaries									838	795	658
Equity in income of subsidiaries									0	17	36
Net income									838	812	694
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net revenues									(17)	(14)	(11)
Operating expenses									(17)	(14)	(11)
Operating income									0	0	0
Other expense (income)									0	0	0
Income (loss) before income taxes and equity in income of subsidiaries									0	0	0
Provision for (benefit from) income taxes									0	0	0
Income (loss) before equity in income of subsidiaries									0	0	0
Equity in income of subsidiaries									(1,677)	(1,600)	(1,328)
Net income									$ (1,677)	$ (1,600)	$ (1,328)

Condensed Consolidating Finan94

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 746	$ 1,025	$ 739
Cash flows from investing activities:
Purchase of property and equipment	(71)	(144)	(144)
Proceeds from sale and maturity of short-term investments	504	4	154
Purchase of short-term investments	(506)	(4)	(4)
Proceeds from sale of investments	10	25	88
Other, net	3	2	2
Net cash provided by (used in) investing activities	(60)	(117)	96
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,248	69	0
Payments of Debt Issuance Costs	(11)	0	0
Principal payments on long-term debt	(569)	0	(250)
Proceeds from notes payable	0	230	275
Principal payments on notes payable	(150)	(80)	(275)
Payment of cash dividends	(326)	(540)	(471)
Purchase of treasury stock	(387)	(207)	(5)
Other, net	27	18	38
Net cash provided by (used in) financing activities	(168)	(510)	(688)
Intercompany investing and financing activities, net	0	0	0
Net increase (decrease) in cash and cash equivalents	518	398	147
Cash and cash equivalents at beginning of year	1,460	1,062	915
Cash and cash equivalents at end of year	1,978	1,460	1,062
TD Ameritrade Holding Corporation [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	27	(81)	(70)
Cash flows from investing activities:
Purchase of property and equipment	0	0	0
Proceeds from sale and maturity of short-term investments	500	0	150
Purchase of short-term investments	(502)	0	0
Proceeds from sale of investments	1	13	78
Other, net	0	0	0
Net cash provided by (used in) investing activities	(1)	13	228
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,248	69
Payments of Debt Issuance Costs	(11)
Principal payments on long-term debt	(569)		(250)
Proceeds from notes payable		230	275
Principal payments on notes payable	(150)	(80)	(275)
Payment of cash dividends	(326)	(540)	(471)
Purchase of treasury stock	(387)	(207)	(5)
Other, net	27	18	43
Net cash provided by (used in) financing activities	(168)	(510)	(683)
Intercompany investing and financing activities, net	945	496	546
Net increase (decrease) in cash and cash equivalents	803	(82)	21
Cash and cash equivalents at beginning of year	117	199	178
Cash and cash equivalents at end of year	920	117	199
Guarantor Subsidiary [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	1	1	1
Cash flows from investing activities:
Purchase of property and equipment	0	0	0
Proceeds from sale and maturity of short-term investments	3	0	0
Purchase of short-term investments	(3)	0	0
Proceeds from sale of investments	0	0	0
Other, net	0	0	0
Net cash provided by (used in) investing activities	0	0	0
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	0
Payments of Debt Issuance Costs	0
Principal payments on long-term debt	0		0
Proceeds from notes payable		0	0
Principal payments on notes payable	0	0	0
Payment of cash dividends	0	0	0
Purchase of treasury stock	0	0	0
Other, net	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Intercompany investing and financing activities, net	(1)	(6)	0
Net increase (decrease) in cash and cash equivalents	0	(5)	1
Cash and cash equivalents at beginning of year	2	7	6
Cash and cash equivalents at end of year	2	2	7
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	718	1,105	808
Cash flows from investing activities:
Purchase of property and equipment	(71)	(144)	(144)
Proceeds from sale and maturity of short-term investments	1	4	4
Purchase of short-term investments	(1)	(4)	(4)
Proceeds from sale of investments	9	12	10
Other, net	3	2	2
Net cash provided by (used in) investing activities	(59)	(130)	(132)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	0
Payments of Debt Issuance Costs	0
Principal payments on long-term debt	0		0
Proceeds from notes payable		0	0
Principal payments on notes payable	0	0	0
Payment of cash dividends	0	0	0
Purchase of treasury stock	0	0	0
Other, net	0	0	(5)
Net cash provided by (used in) financing activities	0	0	(5)
Intercompany investing and financing activities, net	(944)	(490)	(546)
Net increase (decrease) in cash and cash equivalents	(285)	485	125
Cash and cash equivalents at beginning of year	1,341	856	731
Cash and cash equivalents at end of year	$ 1,056	$ 1,341	$ 856

Quarterly Data - Schedule of Qu

Quarterly Data - Schedule of Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 831	$ 794	$ 803	$ 819	$ 795	$ 763	$ 812	$ 752	$ 3,247	$ 3,123	$ 2,764
Operating income	360	325	296	344	338	316	323	307	1,325	1,285	1,056
Net income	$ 216	$ 197	$ 189	$ 211	$ 211	$ 190	$ 194	$ 192	$ 813	$ 787	$ 675
Basic earnings per share (in usd per share)	$ 0.40	$ 0.36	$ 0.35	$ 0.39	$ 0.39	$ 0.34	$ 0.35	$ 0.35	$ 1.50	$ 1.43	$ 1.23
Diluted earnings per share (in usd per share)	$ 0.40	$ 0.36	$ 0.35	$ 0.39	$ 0.38	$ 0.34	$ 0.35	$ 0.35	$ 1.49	$ 1.42	$ 1.22