TD Ameritrade Holding 10-Q 9 May 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Mar. 31, 2014	Apr. 30, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	'Q2	'
Trading Symbol	'AMTD	'
Entity Registrant Name	'TD AMERITRADE HOLDING CORPORATION	'
Entity Central Index Key	'0001173431	'
Current Fiscal Year End Date	'--09-30	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	551,569,868

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
ASSETS	'	'
Cash and cash equivalents	$933	$1,062
Cash and investments segregated and on deposit for regulatory purposes	5,216	5,894
Receivable from brokers, dealers and clearing organizations	1,114	1,348
Receivable from clients, net	11,250	8,984
Receivable from affiliates	117	117
Other receivables, net	151	137
Securities owned, at fair value	391	323
Property and equipment at cost, net	486	497
Goodwill	2,467	2,467
Acquired intangible assets, net	796	841
Other assets	166	166
Total assets	23,087	21,836
Liabilities:	'	'
Payable to brokers, dealers and clearing organizations	3,032	1,973
Payable to clients	13,215	13,183
Accounts payable and accrued liabilities	651	582
Payable to affiliates	6	4
Notes payable	115	0
Deferred revenue	10	14
Long-term debt	1,040	1,052
Deferred income taxes	351	352
Total liabilities	18,420	17,160
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; March 31, 2014 - 551 million shares outstanding; September 30, 2013 - 550 million shares outstanding	6	6
Additional paid-in capital	1,604	1,592
Retained earnings	4,282	4,304
Treasury stock, common, at cost: March 31, 2014 - 80 million shares; September 30, 2013 - 81 million shares	-1,219	-1,226
Accumulated Other Comprehensive Income (Loss), Net of Tax	-6	0
Total stockholders’ equity	4,667	4,676
Total liabilities and stockholders’ equity	$23,087	$21,836

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2014	Sep. 30, 2013
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	551,000,000	550,000,000
Treasury stock, shares	80,000,000	81,000,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Transaction-based revenues:	'	'	'	'
Commissions and transaction fees	$374	$287	$702	$544
Asset-based revenues:	'	'	'	'
Interest revenue	148	116	276	234
Brokerage interest expense	-2	-2	-4	-3
Net interest revenue	146	114	272	231
Insured deposit account fees	202	200	410	405
Investment product fees	75	62	147	117
Total asset-based revenues	423	376	829	753
Other revenues	15	16	33	33
Net revenues	812	679	1,564	1,330
Operating expenses:	'	'	'	'
Employee compensation and benefits	193	178	376	346
Clearing and execution costs	34	27	63	51
Communications	28	29	56	57
Occupancy and equipment costs	40	40	77	79
Depreciation and amortization	24	20	48	41
Amortization of acquired intangible assets	22	22	45	45
Professional services	37	33	75	67
Advertising	94	76	157	128
Other	17	17	37	38
Total operating expenses	489	442	934	852
Operating income	323	237	630	478
Other expense (income):	'	'	'	'
Interest on borrowings	6	6	12	12
Gain on sale of investments	0	0	0	-2
Total other expense (income)	6	6	12	10
Pre-tax income	317	231	618	468
Provision for income taxes	123	87	232	177
Net income	$194	$144	$386	$291
Earnings per share - basic (in usd per share)	$0.35	$0.26	$0.70	$0.53
Earnings per share - diluted (in usd per share)	$0.35	$0.26	$0.70	$0.53
Weighted average shares outstanding - basic (in shares)	551	549	551	547
Weighted average shares outstanding - diluted (in shares)	556	554	555	552
Dividends declared per share (in usd per share)	$0.12	$0.09	$0.74	$0.68

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$194	$144	$386	$291
Investments available-for-sale:	'	'	'	'
Net unrealized gain	0	6	0	27
Cash flow hedging instruments:	'	'	'	'
Net unrealized loss	-9	0	-9	0
Total other comprehensive income (loss), before tax	-9	6	-9	27
Income tax effect	3	-2	3	-10
Total other comprehensive income (loss), net of tax	-6	4	-6	17
Comprehensive income	$188	$148	$380	$308

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:	'	'
Net income	$386	$291
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	48	41
Amortization of acquired intangible assets	45	45
Deferred income taxes	2	14
Gain on sale of investments	0	-2
Stock-based compensation	16	15
Excess tax benefits on stock-based compensation	-8	-24
Other, net	-1	-1
Changes in operating assets and liabilities:	'	'
Cash and investments segregated and on deposit for regulatory purposes	678	-354
Receivable from brokers, dealers and clearing organizations	234	-189
Receivable from clients, net	-2,266	-203
Receivable from/payable to affiliates, net	2	-50
Other receivables, net	-14	-11
Securities owned, at fair value	-68	-20
Other assets	-25	-10
Payable to brokers, dealers and clearing organizations	1,059	324
Payable to clients	32	789
Accounts payable and accrued liabilities	70	13
Deferred revenue	-4	-8
Net cash provided by operating activities	186	660
Cash flows from investing activities:	'	'
Purchase of property and equipment	-37	-92
Proceeds from sale and maturity of short-term investments	0	150
Proceeds from sale of investments	13	3
Other	1	1
Net cash provided by (used in) investing activities	-23	62
Cash flows from financing activities:	'	'
Principal payments on long-term debt	0	-250
Proceeds from notes payable	155	275
Principal payments on notes payable	-40	-110
Payment of cash dividends	-408	-372
Proceeds from exercise of stock options: Six months ended March 31, 2014 - 0.4 million shares; 2013 - 4.6 million shares	7	19
Purchase of treasury stock: Six months ended March 31, 2014 - 0.5 million shares; 2013 - 0.2 million shares	-14	-4
Principal payments on capital lease obligations	0	-1
Excess tax benefits on stock-based compensation	8	24
Net cash used in financing activities	-292	-419
Net increase (decrease) in cash and cash equivalents	-129	303
Cash and cash equivalents at beginning of period	1,062	915
Cash and cash equivalents at end of period	933	1,218
Supplemental cash flow information:	'	'
Interest paid	15	16
Income taxes paid	$127	$103

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parenthetical)	6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Statement of Cash Flows [Abstract]	'	'
Proceeds from exercise of stock options, shares	0.4	4.6
Purchase of treasury stock, shares	0.5	0.2

Basis_of_Presentation

Basis of Presentation	6 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	BASIS OF PRESENTATION
	The condensed consolidated financial statements include the accounts of TD Ameritrade Holding Corporation and its wholly-owned subsidiaries (collectively, the “Company”). Intercompany balances and transactions have been eliminated.
	These financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and, in the opinion of management, reflect all adjustments, which are all of a normal recurring nature, necessary to present fairly the financial position, results of operations and cash flows for the periods presented in conformity with U.S. generally accepted accounting principles. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s annual report filed on Form 10-K for the fiscal year ended September 30, 2013.
	Recently Adopted Accounting Pronouncements
	ASU 2011-11 — On October 1, 2013 the Company retrospectively adopted, for all comparative periods presented, Accounting Standards Update (“ASU”) 2011-11, Disclosures about Offsetting Assets and Liabilities, and ASU 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities. The amendments in these ASUs enhance disclosures by requiring additional information about financial and derivative instruments, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either (1) offset (netting assets and liabilities) in accordance with Section 210-20-45 or Section 815-10-45 of the Financial Accounting Standards Board Accounting Standards Codification (“ASC”) or (2) subject to an enforceable master netting arrangement or similar agreement. Adoption of ASU 2011-11 and ASU 2013-01 resulted only in the additional disclosures presented in Note 9.

Cash_and_Cash_Equivalents

Cash and Cash Equivalents	6 Months Ended
	Mar. 31, 2014
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):
		March 31,		September 30,
		2014		2013
	Corporate	$	347	$	429
	Broker-dealer subsidiaries	508		540
	Trust company subsidiary	64		74
	Investment advisory subsidiaries	14		19
	Total	$	933	$	1,062
	Capital requirements may limit the amount of cash available for dividend from the broker-dealer 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_Segregate

Cash and Investments Segregated and on Deposit for Regulatory Purposes	6 Months Ended
	Mar. 31, 2014
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):
		March 31,		September 30,
		2014		2013
	Reverse repurchase agreements (collateralized by U.S. government debt securities)	$	1,590	$	2,618
	U.S. government debt securities	2,976		1,995
	Cash in demand deposit accounts	508		1,154
	Cash on deposit with futures commission merchant	92		77
	U.S. government debt securities on deposit with futures commission merchant	50		50
	Total	$	5,216	$	5,894

Income_Taxes

Income Taxes	6 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	The Company’s effective income tax rate for the six months ended March 31, 2014 was 37.5%, compared to 37.8% for the six months ended March 31, 2013. The provision for income taxes for the six months ended March 31, 2014 was slightly lower than normal primarily due to $9 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 the six months ended March 31, 2014 of approximately one cent per share.

Notes_Payable_and_LongTerm_Deb

Notes Payable and Long-Term Debt	6 Months Ended
	Mar. 31, 2014
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):
	31-Mar-14	Face				Fair Value				Net Carrying
		Value				Adjustment (1)				Value
	Notes payable:
	Parent Revolving Facility	$	115			$	—			$	115
	Senior Notes:
	4.150% Senior Notes due 2014	500				8				508
	5.600% Senior Notes due 2019	500				32				532
	Subtotal – Long-term debt	1,000				40				1,040
	Total notes payable and long-term debt	$	1,115			$	40			$	1,155
	September 30, 2013	Face				Fair Value				Net Carrying
		Value				Adjustment (1)				Value
	Senior Notes:
	4.150% Senior Notes due 2014	$	500			$	15			$	515
	5.600% Senior Notes due 2019	500				37				537
	Total long-term debt	$	1,000			$	52			$	1,052
	-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.
	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 this exposure, on December 30, 2009, the Company entered into a fixed-for-variable interest rate swap on the 4.150% Senior Notes due December 1, 2014 (the “2014 Notes”) for a notional amount of $500 million with a maturity date matching the maturity date of the 2014 Notes. In addition, on January 7, 2011, the Company entered into a fixed-for-variable interest rate swap on the 5.600% Senior Notes due December 1, 2019 (the “2019 Notes” and, collectively with the 2014 Notes, the “Senior Notes”) for a notional amount of $500 million, with a maturity date matching the maturity date of the 2019 Notes. The interest rate swaps effectively change the fixed-rate interest on the Senior 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) 1.245% for the swap on the 2014 Notes and (b) 2.3745% for the swap on the 2019 Notes. As of March 31, 2014, the weighted average effective interest rate on the Senior Notes was 2.05%.
	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 Condensed 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 the interest rate swaps and the hedged fixed-rate debt for the periods indicated (dollars in millions):
		Three Months Ended March 31,								Six Months Ended March 31,
		2014				2013				2014			2013
	Gain (loss) on fair value of interest rate swaps	$	(1	)		$	(8	)		$	(12	)	$	(16	)
	Gain (loss) on fair value of hedged fixed-rate debt	1				8				12			16
	Net gain (loss) recorded in interest on borrowings	$	—			$	—			$	—		$	—
	Cash Flow Hedging – The Company plans to refinance its 2014 Notes on or near their December 1, 2014 maturity date.  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 fixed-rate debt issuance.  The Company has designated the contracts as a cash flow hedge of the future interest payments.  The Company expects to settle the swap contracts in cash upon the earlier of the date of the debt issuance or December 1, 2014.  If, upon settlement, the current 10-year LIBOR swap rate is greater than the fixed rate (3.341%) of the swap contracts, the Company would realize a gain and receive a payment from the contract counterparties.  However, if, at the time of settlement, the current 10-year LIBOR swap rate is less than the fixed rate of the swap contracts, the Company would realize a loss and be required to make a payment to the contract counterparties.
	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. The Company evaluates the effectiveness of forward-starting interest rate swap agreements on a quarterly basis. The Company did not record any ineffectiveness for the six months ended March 31, 2014. Upon settlement, any realized gain or loss that has been recorded in other comprehensive income (loss) will be amortized into earnings over the term of the newly-issued fixed-rate debt. As of March 31, 2014, the Company expects to reclassify $0.3 million of pre-tax net unrealized losses, that are currently reported in accumulated other comprehensive loss, into earnings 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 periods indicated (dollars in millions):
		Amount of Loss Recognized in Other Comprehensive Income (Loss)
		(Effective Portion)
		Three Months Ended March 31,								Six Months Ended March 31,
		2014				2013				2014			2013
	Forward-starting interest rate swaps	$	(9	)		$	—			$	(9	)	$	—
	Balance Sheet Impact of Hedging Instruments — The following table summarizes the fair value of outstanding derivatives designated as hedging instruments on the Condensed Consolidated Balance Sheets (dollars in millions):
			Balance Sheet Location		March 31,				September 30,
					2014				2013
	Interest rate contracts:
	Pay-variable interest rate swaps designated as fair value hedges		Other assets		$	40			$	52
	Forward-starting interest rate swaps designated as cash flow hedges		Accounts payable and accrued liabilities		$	(9	)		$	—
	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 Commodity Futures Trading Commission. 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. As of March 31, 2014 and September 30, 2013, the pay-variable interest rate swap counterparties had pledged $55 million and $67 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 accrued liabilities on the Condensed Consolidated Balance Sheets. As of March 31, 2014, the Company had pledged $24 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 Condensed Consolidated Balance Sheets.
	TD Ameritrade Holding Corporation Credit Agreement — On December 13, 2013, the Company borrowed $155 million under the TD Ameritrade Holding Corporation senior unsecured revolving credit facility (the “Parent Revolving Facility”). The Company used the proceeds to partially fund a $0.50 per share special cash dividend, paid on the Company’s common stock on December 17, 2013. As of March 31, 2014, there was $115 million of borrowings outstanding under the Parent Revolving Facility. The maturity date of the Parent Revolving Facility is June 28, 2014. Interest is payable monthly based on one-month LIBOR plus an interest rate margin. As of March 31, 2014, the interest rate margin was 1.25%, determined by reference to the Company’s public debt ratings, and the interest rate was 1.41%.

Capital_Requirements

Capital Requirements	6 Months Ended
	Mar. 31, 2014
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 Securities Exchange Act of 1934, or the “Exchange Act”), administered by the SEC and the Financial Industry Regulatory Authority (“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.
	TD Ameritrade Clearing, Inc. (“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. As a futures commission merchant registered with the Commodity Futures Trading Commission (“CFTC”), TD Ameritrade, Inc. is also subject to CFTC Regulation 1.17 under the Commodity Exchange Act, administered by the CFTC and the National Futures Association, 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 futures commission merchant in client and nonclient accounts, or (c) its Rule 15c3-1 net capital requirement.
	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. These 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		Required		Net Capital		Net Capital in		Ratio of Net
		Capital		Net Capital		in Excess of		Excess of		Capital to
				(2% of		Required		Early Warning		Aggregate
				Aggregate		Net Capital		Threshold (5%		Debit Balances
				Debit Balances)				of Aggregate
								Debit Balances)
	March 31, 2014	$	1,423	$	266	$	1,157	$	757	10.68	%
	September 30, 2013	$	1,302	$	222	$	1,080	$	746	11.7	%
	TD Ameritrade, Inc.
	Date	Net		Required		Net Capital		Net Capital in
		Capital		Net Capital		in Excess of		Excess of
				(8% of Total		Required		Early Warning
				Risk Margin)		Net Capital		Threshold
								(110% of
								Required
								Net Capital)
	31-Mar-14	$	319	$	11	$	308	$	307
	30-Sep-13	$	305	$	10	$	295	$	294
	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 $25 million and $23 million as of March 31, 2014 and September 30, 2013, respectively, which exceeded the required Tier 1 capital by $10 million and $8 million, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Legal and Regulatory Matters
	Reserve Fund Matters – 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. On July 23, 2010, The Reserve announced that through that date it had distributed approximately 94.8% of the Yield Plus Fund assets as of September 15, 2008 and that the Yield Plus Fund had approximately $39.7 million in total remaining assets.  The Reserve stated that the fund’s Board of Trustees has set aside almost the entire amount of the remaining assets to cover potential claims, fees and expenses. The Company estimates that TD Ameritrade, Inc. clients’ current positions held in the Reserve Yield Plus Fund amount to approximately 79% of the fund.
	On January 27, 2011, TD Ameritrade, Inc. entered into a settlement with the SEC, agreeing to pay $0.012 per share to all eligible current or former clients that purchased shares of the Yield Plus Fund and continued to own those shares. Clients who purchased Yield Plus Fund shares through independent registered investment advisors were not eligible for the payment. In February 2011, the Company paid clients approximately $10 million under the settlement agreement.
	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. The complaint seeks an unspecified amount of compensatory damages including interest, attorneys’ fees, rescission, exemplary damages and equitable relief. On January 19, 2010, the defendants submitted motions to dismiss the complaint. The motions are pending.
	The Company estimates that its clients’ current aggregate shortfall, based on the original par value of their holdings in the Yield Plus Fund, less the value of fund distributions to date and payments to clients under the SEC settlement, is approximately $36 million. This amount does not take into account any assets remaining in the fund that may become available for future distributions.
	The Company is unable to predict the outcome or the timing of the ultimate resolution of the Ross lawsuit, or the potential loss, if any, that may result. However, management believes the outcome is not likely to have a material adverse effect on the financial condition, results of operations or cash flows of the Company.
	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 $40 million as of March 31, 2014. 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 condensed consolidated financial statements could be significantly changed at a later date upon final determinations by taxing authorities. The Toronto-Dominion Bank (“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 condensed consolidated financial statements. These include the Company’s broker-dealer 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 cash and securities. 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 purchase or sell financial instruments 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 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 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):
		March 31,			September 30,
		2014			2013
	Client margin securities	$	15.6		$	12.5
	Stock borrowings	1			1.2
	Total collateral available	$	16.6		$	13.7
	Collateral loaned	$	3		$	1.9
	Collateral repledged	2.1			1.8
	Total collateral loaned or repledged	$	5.1		$	3.7
	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):
	Assets		Balance Sheet Classification	March 31,			September 30,
				2014			2013
	Cash		Receivable from brokers, dealers and clearing organizations	$	139		$	115
	U.S. government debt securities		Securities owned, at fair value	156			61
	Total			$	295		$	176
	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 Condensed Consolidated Balance Sheets for these guarantees.
	The Company clears its clients’ futures transactions on an omnibus account basis through unaffiliated clearing firms. The Company has agreed to indemnify the unaffiliated clearing firms for any loss that they may incur for the client transactions introduced to them by the Company.
	See “Insured Deposit Account Agreement” in Note 12 for a description of a guarantee included in that agreement.
	Employment Agreements
	The Company has entered into employment agreements with several of its key executive officers. These employment agreements generally provide for annual base salary and incentive compensation, as well as stock award acceleration and severance payments in the event of termination of employment under certain defined circumstances or changes in control of the Company. Incentive compensation, a portion of which is awarded in the form of stock-based compensation, is based on the Company’s financial performance and other factors.

Fair_Value_Disclosures

Fair Value Disclosures	6 Months Ended
	Mar. 31, 2014
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 March 31, 2014 and September 30, 2013 (dollars in millions):
		As of March 31, 2014
		Level 1		Level 2		Level 3		Fair Value
	Assets:
	Cash equivalents:
	Money market mutual funds	$	869	$	—	$	—	$	869
	Investments segregated for regulatory purposes:
	U.S. government debt securities	—		3,026		—		3,026
	Securities owned:
	Auction rate securities	—		—		3		3
	Money market and other mutual funds	—		—		1		1
	U.S. government debt securities	—		382		—		382
	Other	1		4		—		5
	Subtotal - Securities owned	1		386		4		391
	Other assets:
	Pay-variable interest rate swaps(1)	—		40		—		40
	U.S. government debt securities	—		4		—		4
	Subtotal - Other assets	—		44		—		44
	Total assets at fair value	$	870	$	3,456	$	4	$	4,330
	Liabilities:
	Accounts payable and accrued liabilities:
	Forward-starting interest rate swaps(2)	$	—	$	9	$	—	$	9
	Securities sold, not yet purchased:
	Equity securities	8		—		—		8
	Total liabilities at fair value	$	8	$	9	$	—	$	17
	-1	See “Fair Value Hedging” in Note 5 for details.
	-2	See "Cash Flow Hedging" in Note 5 for details.
		As of September 30, 2013
		Level 1		Level 2		Level 3		Fair Value
	Assets:
	Cash equivalents:
	Money market mutual funds	$	969	$	—	$	—	$	969
	Investments segregated for regulatory purposes:
	U.S. government debt securities	—		2,045		—		2,045
	Securities owned:
	Auction rate securities	—		—		5		5
	Money market and other mutual funds	—		—		1		1
	U.S. government debt securities	—		313		—		313
	Other	1		3		—		4
	Subtotal - Securities owned	1		316		6		323
	Other assets:
	Equity securities	13		—		—		13
	Pay-variable interest rate swaps(1)	—		52		—		52
	U.S. government debt securities	—		4		—		4
	Subtotal - Other assets	13		56		—		69
	Total assets at fair value	$	983	$	2,417	$	6	$	3,406
	Liabilities:
	Accounts payable and accrued liabilities:
	Securities sold, not yet purchased:
	Equity securities	$	13	$	—	$	—	$	13
	-1	See “Fair Value Hedging” in Note 5 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 condensed 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 accrued 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 accrued 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 a futures commission merchant, 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.
Senior Notes – As of March 31, 2014, 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 $1.081 billion, compared to the aggregate carrying value of the Senior Notes on the Condensed Consolidated Balance Sheet of $1.040 billion. As of September 30, 2013, the Company’s Senior Notes had an aggregate estimated fair value, based on quoted market prices, of approximately $1.100 billion, compared to the aggregate carrying value of the Senior Notes on the Condensed Consolidated Balance Sheet of $1.052 billion.

Offsetting_Assets_and_Liabilit

Offsetting Assets and Liabilities	6 Months Ended
	Mar. 31, 2014
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 table presents information about the potential effect of rights of setoff associated with the Company’s recognized assets and liabilities as of March 31, 2014 and September 30, 2013 (dollars in millions):
								Gross Amounts Not Offset in the
								Condensed Consolidated
								Balance Sheet
		Gross Amounts		Gross Amounts		Net Amounts		Financial			Collateral			Net Amount (5)
		of Recognized		Offset in the		Presented in		Instruments(3)			Received or
		Assets and		Condensed		the Condensed					Pledged
		Liabilities		Consolidated		Consolidated					(Including
				Balance Sheet		Balance Sheet					Cash) (4)
	31-Mar-14
	Assets:
	Investments segregated for regulatory
	purposes:
	Reverse repurchase agreements	$	1,590	$	—	$	1,590	$	—		$	(1,590	)	$	—
	Receivable from brokers, dealers and
	clearing organizations:
	Deposits paid for securities	956		—		956		(64		)	(876		)	16
	borrowed (1)
	Other assets:
	Pay-variable interest rate swaps	40		—		40		—			(40		)	—
	Total	$	2,586	$	—	$	2,586	$	(64	)	$	(2,506	)	$	16
	Liabilities:
	Payable to brokers, dealers and clearing
	organizations:
	Deposits received for securities	$	2,980	$	—	$	2,980	$	(64	)	$	(2,613	)	$	303
	loaned (2)
	Accounts payable and accrued liabilities:
	Forward-starting interest rate swaps	9		—		9		—			(9		)	—
	Total	$	2,989	$	—	$	2,989	$	(64	)	$	(2,622	)	$	303
	30-Sep-13
	Assets:
	Investments segregated for regulatory
	purposes:
	Reverse repurchase agreements	$	2,618	$	—	$	2,618	$	—		$	(2,618	)	$	—
	Receivable from brokers, dealers and
	clearing organizations:
	Deposits paid for securities	1,220		—		1,220		(168		)	(1,020		)	32
	borrowed (1)
	Other assets:
	Pay-variable interest rate swaps	52		—		52		—			(52		)	—
	Total	$	3,890	$	—	$	3,890	$	(168	)	$	(3,690	)	$	32
	Liabilities:
	Payable to brokers, dealers and clearing
	organizations:
	Deposits received for securities	$	1,948	$	—	$	1,948	$	(168	)	$	(1,561	)	$	219
	loaned (2)
	-1	Included in the gross amounts of deposits paid for securities borrowed is $616 million and $702 million as of March 31, 2014 and September 30, 2013, respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of cash to the Company.
	-2	Included in the gross amounts of deposits received for securities loaned is $792 million and $275 million as of March 31, 2014 and September 30, 2013, respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of securities to the Company.
	-3	Amounts represent recognized assets and liabilities that are subject to enforceable master agreements with rights of setoff.
	-4	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 March 31, 2014 and September 30, 2013, the Company had received total collateral with a fair value of $2,619 million and $3,919 million, respectively, and pledged total collateral with a fair value of $2,700 million and $1,721 million, respectively.
	-5	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_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Accumulated Other Comprehensive Income (Loss)	'
	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	The following tables present the net change in fair value recorded for each component of other comprehensive income (loss) before and after income tax for the periods indicated (dollars in millions):
		Three Months Ended March 31,
		2014								2013
		Before Tax			Tax Effect		Net of Tax			Before Tax		Tax Effect			Net of Tax
	Investments available-for-sale:
	Net unrealized gain	$	—		$	—	$	—		$	6	$	(2	)	$	4
	Cash flow hedging instruments:
	Net unrealized loss	(9		)	3		(6		)	—		—			—
	Other comprehensive income (loss)	$	(9	)	$	3	$	(6	)	$	6	$	(2	)	$	4
		Six Months Ended March 31,
		2014								2013
		Before Tax			Tax Effect		Net of Tax			Before Tax		Tax Effect			Net of Tax
	Investments available-for-sale:
	Net unrealized gain	$	—		$	—	$	—		$	27	$	(10	)	$	17
	Cash flow hedging instruments:
	Net unrealized loss	(9		)	3		(6		)	—		—			—
	Other comprehensive income (loss)	$	(9	)	$	3	$	(6	)	$	27	$	(10	)	$	17
	The following table presents after-tax changes in each component of accumulated other comprehensive income (loss) (dollars in millions):
		Three Months Ended March 31,					Six Months Ended March 31,
		2014			2013		2014			2013
	Investments available-for-sale:
	Beginning balance	$	—		$	31	$	—		$	18
	Current period change	—			4		—			17
	Ending balance	$	—		$	35	$	—		$	35
	Cash flow hedging instruments:
	Beginning balance	$	—		$	—	$	—		$	—
	Current period change	(6		)	—		(6		)	—
	Ending balance	$	(6	)	$	—	$	(6	)	$	—
	Total accumulated other comprehensive
	income (loss):
	Beginning balance	$	—		$	31	$	—		$	18
	Current period change	(6		)	4		(6		)	17
	Ending balance	$	(6	)	$	35	$	(6	)	$	35

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	EARNINGS PER SHARE
	The difference between the numerator and denominator used in the computation of basic and diluted earnings per share consists of common stock equivalent shares related to stock-based compensation for all periods presented. The Company excluded from the calculation of diluted earnings per share 0.2 million and 1.4 million shares underlying stock-based compensation awards for the three and six months ended March 31, 2013, respectively, because their inclusion would have been antidilutive. There were no material antidilutive awards for the three and six months ended March 31, 2014.

Related_Party_Transactions

Related Party Transactions	6 Months Ended
	Mar. 31, 2014
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 40% of the Company’s common stock as of March 31, 2014. 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
	The Company is party to an insured deposit account (“IDA”) agreement with TD Bank USA, N.A. (“TD Bank USA”), TD Bank, N.A. and TD. Under the IDA agreement, TD Bank USA and TD Bank, N.A. (together, the “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 Depository Institutions with respect to the money market deposit accounts. In exchange for providing these services, the 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 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 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 March 31, 2014, the IDA portfolio was comprised of approximately 79% fixed-rate notional investments and 21% 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 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 Depository Institutions and the cost of FDIC insurance premiums). Under the current IDA agreement, 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%.
	Under the current IDA agreement, 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 Depository Institutions and are not linked to any index. The servicing fee to the 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 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 Depository Institutions the negative amount. This effectively results in the Company guaranteeing the 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 Condensed 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 periods indicated (dollars in millions):
				Revenues from TD and Affiliates
			Statement of Income	Three months ended March 31,					Six months ended March 31,
	Description		Classification	2014			2013		2014		2013
	Insured Deposit Account Agreement		Insured deposit account fees	$	202		$	200	$	410	$	405
	Referral and Strategic Alliance Agreement		Various	3			3		6		5
	Other		Various	2			—		3		3
	Total revenues			$	207		$	203	$	419	$	413
				Expenses to TD and Affiliates
			Statement of Income	Three months ended March 31,					Six months ended March 31,
	Description		Classification	2014			2013		2014		2013
	Canadian Call Center Services Agreement		Professional services	$	5		$	4	$	9	$	9
	Other		Various	2			2		2		2
	Total expenses			$	7		$	6	$	11	$	11
	The following table summarizes the classification and amount of receivables from and payables to TD and its affiliates on the Condensed Consolidated Balance Sheets resulting from related party transactions (dollars in millions):
		March 31,			September 30,
		2014			2013
	Assets:
	Receivable from brokers, dealers and clearing organizations	$	—		$	1
	Receivable from affiliates	117			117
	Liabilities:
	Payable to brokers, dealers and clearing organizations	$	110		$	115
	Payable to affiliates	6			4
	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_Financ

Condensed Consolidating Financial Information	6 Months Ended
	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Condensed Consolidating Financial Information	'
	CONDENSED CONSOLIDATING FINANCIAL INFORMATION
	The Senior Notes are jointly and severally and fully and unconditionally guaranteed by TD Ameritrade Online Holdings Corp. (“TDAOH”), a wholly-owned subsidiary of the Company. 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 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 MARCH 31, 2014
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	ASSETS
	Cash and cash equivalents	$	157		$	3		$	773		$	—		$	933
	Cash and investments segregated and on	—			—			5,216			—			5,216
	deposit for regulatory purposes
	Receivable from brokers, dealers and	—			—			1,114			—			1,114
	clearing organizations
	Receivable from clients, net	—			—			11,250			—			11,250
	Investments in subsidiaries	5,661			5,548			—			(11,209		)	—
	Receivable from affiliates	8			3			114			(8		)	117
	Goodwill	—			—			2,467			—			2,467
	Acquired intangible assets, net	—			146			650			—			796
	Other, net	135			13			1,087			(41		)	1,194
	Total assets	$	5,961		$	5,713		$	22,671		$	(11,258	)	$	23,087
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Liabilities:
	Payable to brokers, dealers and	$	—		$	—		$	3,032		$	—		$	3,032
	clearing organizations
	Payable to clients	—			—			13,215			—			13,215
	Accounts payable and accrued liabilities	139			—			522			(10		)	651
	Payable to affiliates	—			—			14			(8		)	6
	Notes payable	115			—			—			—			115
	Long-term debt	1,040			—			—			—			1,040
	Other	—			52			340			(31		)	361
	Total liabilities	1,294			52			17,123			(49		)	18,420
	Stockholders’ equity	4,667			5,661			5,548			(11,209		)	4,667
	Total liabilities and stockholders’ equity	$	5,961		$	5,713		$	22,671		$	(11,258	)	$	23,087
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF SEPTEMBER 30, 2013
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	ASSETS
	Cash and cash equivalents	$	199		$	7		$	856		$	—		$	1,062
	Cash and investments segregated and on	—			—			5,894			—			5,894
	deposit for regulatory purposes
	Receivable from brokers, dealers and	—			—			1,348			—			1,348
	clearing organizations
	Receivable from clients, net	—			—			8,984			—			8,984
	Investments in subsidiaries	5,568			5,360			550			(11,478		)	—
	Receivable from affiliates	4			3			117			(7		)	117
	Goodwill	—			—			2,467			—			2,467
	Acquired intangible assets, net	—			146			695			—			841
	Other, net	140			9			1,015			(41		)	1,123
	Total assets	$	5,911		$	5,525		$	21,926		$	(11,526	)	$	21,836
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Liabilities:
	Payable to brokers, dealers and	$	—		$	—		$	1,973		$	—		$	1,973
	clearing organizations
	Payable to clients	—			—			13,183			—			13,183
	Accounts payable and accrued liabilities	180			—			410			(8		)	582
	Payable to affiliates	3			—			8			(7		)	4
	Long-term debt	1,052			—			—			—			1,052
	Other	—			51			348			(33		)	366
	Total liabilities	1,235			51			15,922			(48		)	17,160
Stockholders’ equity	4,676			5,474			6,004			(11,478		)	4,676
Total liabilities and stockholders’ equity	$	5,911		$	5,525		$	21,926		$	(11,526	)	$	21,836
CONDENSED CONSOLIDATING STATEMENT OF INCOME
THREE MONTHS ENDED MARCH 31, 2014
(Unaudited)
	Parent			Guarantor			Non-Guarantor			Eliminations			Total
				Subsidiary			Subsidiaries
	(In millions)
Net revenues	$	4		$	—		$	812		$	(4	)	$	812
Operating expenses	3			—			490			(4		)	489
Operating income	1			—			322			—			323
Other expense	6			—			—			—			6
Income (loss) before income taxes and equity	(5		)	—			322			—			317
in income of subsidiaries
Provision for (benefit from) income taxes	(1		)	—			124			—			123
Income (loss) before equity in income of	(4		)	—			198			—			194
subsidiaries
Equity in income of subsidiaries	198			194			7			(399		)	—
Net income	$	194		$	194		$	205		$	(399	)	$	194
CONDENSED CONSOLIDATING STATEMENT OF INCOME
THREE MONTHS ENDED MARCH 31, 2013
(Unaudited)
	Parent			Guarantor			Non-Guarantor			Eliminations			Total
				Subsidiary			Subsidiaries
	(In millions)
Net revenues	$	4		$	—		$	679		$	(4	)	$	679
Operating expenses	3			—			443			(4		)	442
Operating income	1			—			236			—			237
Other expense (income)	7			—			(1		)	—			6
Income (loss) before income taxes and equity	(6		)	—			237			—			231
in income of subsidiaries
Provision for (benefit from) income taxes	(3		)	—			90			—			87
Income (loss) before equity in income of	(3		)	—			147			—			144
subsidiaries
Equity in income of subsidiaries	147			140			8			(295		)	—
Net income	$	144		$	140		$	155		$	(295	)	$	144
CONDENSED CONSOLIDATING STATEMENT OF INCOME
SIX MONTHS ENDED MARCH 31, 2014
(Unaudited)
	Parent			Guarantor			Non-Guarantor			Eliminations			Total
				Subsidiary			Subsidiaries
	(In millions)
Net revenues	$	6		$	—		$	1,564		$	(6	)	$	1,564
Operating expenses	5			—			935			(6		)	934
Operating income	1			—			629			—			630
Other expense	12			—			—			—			12
Income (loss) before income taxes and equity	(11		)	—			629			—			618
in income of subsidiaries
Provision for (benefit from) income taxes	(11		)	1			242			—			232
Income (loss) before equity in income of	—			(1		)	387			—			386
subsidiaries
Equity in income of subsidiaries	386			379			17			(782		)	—
Net income	$	386		$	378		$	404		$	(782	)	$	386
CONDENSED CONSOLIDATING STATEMENT OF INCOME
SIX MONTHS ENDED MARCH 31, 2013
(Unaudited)
	Parent			Guarantor			Non-Guarantor			Eliminations			Total
				Subsidiary			Subsidiaries
	(In millions)
Net revenues	$	8		$	—		$	1,329		$	(7	)	$	1,330
Operating expenses	7			—			852			(7		)	852
Operating income	1			—			477			—			478
Other expense (income)	13			—			(3		)	—			10
Income (loss) before income taxes and equity	(12		)	—			480			—			468
in income of subsidiaries
Provision for (benefit from) income taxes	(6		)	1			182			—			177
Income (loss) before equity in income of	(6		)	(1		)	298			—			291
subsidiaries
Equity in income of subsidiaries	297			285			16			(598		)	—
Net income	$	291		$	284		$	314		$	(598	)	$	291
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
SIX MONTHS ENDED MARCH 31, 2014
(Unaudited)
	Parent			Guarantor			Non-Guarantor			Total
				Subsidiary			Subsidiaries
	(In millions)
Net cash provided by (used in) operating activities	$	(56	)	$	1		$	241		$	186
Cash flows from investing activities:
Purchase of property and equipment	—			—			(37		)	(37		)
Proceeds from sale of investments	13			—			—			13
Other	—			—			1			1
Net cash provided by (used in) investing activities	13			—			(36		)	(23		)
Cash flows from financing activities:
Proceeds from notes payable	155			—			—			155
Principal payments on notes payable	(40		)	—			—			(40		)
Payment of cash dividends	(408		)	—			—			(408		)
Purchase of treasury stock	(14		)	—			—			(14		)
Other, net	15			—			—			15
Net cash used in financing activities	(292		)	—			—			(292		)
Intercompany investing and financing activities, net	293			(5		)	(288		)	—
Net decrease in cash and cash equivalents	(42		)	(4		)	(83		)	(129		)
Cash and cash equivalents at beginning of period	199			7			856			1,062
Cash and cash equivalents at end of period	$	157		$	3		$	773		$	933
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
SIX MONTHS ENDED MARCH 31, 2013
(Unaudited)
	Parent			Guarantor			Non-Guarantor			Total
				Subsidiary			Subsidiaries
	(In millions)
Net cash provided by (used in) operating activities	$	(41	)	$	—		$	701		$	660
Cash flows from investing activities:
Purchase of property and equipment	—			—			(92		)	(92		)
Proceeds from sale and maturity of short-term investments	150			—			—			150
Proceeds from sale of investments	—			—			3			3
Other	—			—			1			1
Net cash provided by (used in) investing activities	150			—			(88		)	62
Cash flows from financing activities:
Principal payments on long-term debt	(250		)	—			—			(250		)
Proceeds from notes payable	275			—			—			275
Principal payments on notes payable	(110		)	—			—			(110		)
Payment of cash dividends	(372		)	—			—			(372		)
Purchase of treasury stock	(4		)	—			—			(4		)
Other, net	43			—			(1		)	42
Net cash used in financing activities	(418		)	—			(1		)	(419		)
Intercompany investing and financing activities, net	277			—			(277		)	—
Net increase (decrease) in cash and cash equivalents	(32		)	—			335			303
Cash and cash equivalents at beginning of period	178			6			731			915
Cash and cash equivalents at end of period	$	146		$	6		$	1,066		$	1,218

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	6 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Recently Adopted Accounting Pronouncements	'
	Recently Adopted Accounting Pronouncements
	ASU 2011-11 — On October 1, 2013 the Company retrospectively adopted, for all comparative periods presented, Accounting Standards Update (“ASU”) 2011-11, Disclosures about Offsetting Assets and Liabilities, and ASU 2013-01, Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities. The amendments in these ASUs enhance disclosures by requiring additional information about financial and derivative instruments, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either (1) offset (netting assets and liabilities) in accordance with Section 210-20-45 or Section 815-10-45 of the Financial Accounting Standards Board Accounting Standards Codification (“ASC”) or (2) subject to an enforceable master netting arrangement or similar agreement. Adoption of ASU 2011-11 and ASU 2013-01 resulted only in the additional disclosures presented in Note 9.
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)	6 Months Ended
	Mar. 31, 2014
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):
		March 31,		September 30,
		2014		2013
	Corporate	$	347	$	429
	Broker-dealer subsidiaries	508		540
	Trust company subsidiary	64		74
	Investment advisory subsidiaries	14		19
	Total	$	933	$	1,062

Cash_and_Investments_Segregate1

Cash and Investments Segregated and on Deposit for Regulatory Purposes (Tables)	6 Months Ended
	Mar. 31, 2014
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):
		March 31,		September 30,
		2014		2013
	Reverse repurchase agreements (collateralized by U.S. government debt securities)	$	1,590	$	2,618
	U.S. government debt securities	2,976		1,995
	Cash in demand deposit accounts	508		1,154
	Cash on deposit with futures commission merchant	92		77
	U.S. government debt securities on deposit with futures commission merchant	50		50
	Total	$	5,216	$	5,894

Notes_Payable_and_LongTerm_Deb1

Notes Payable and Long-Term Debt (Tables)	6 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Schedule of Notes Payable and Long-Term Debt	'
	Notes payable and long-term debt consist of the following (dollars in millions):
	31-Mar-14	Face				Fair Value				Net Carrying
		Value				Adjustment (1)				Value
	Notes payable:
	Parent Revolving Facility	$	115			$	—			$	115
	Senior Notes:
	4.150% Senior Notes due 2014	500				8				508
	5.600% Senior Notes due 2019	500				32				532
	Subtotal – Long-term debt	1,000				40				1,040
	Total notes payable and long-term debt	$	1,115			$	40			$	1,155
	September 30, 2013	Face				Fair Value				Net Carrying
		Value				Adjustment (1)				Value
	Senior Notes:
	4.150% Senior Notes due 2014	$	500			$	15			$	515
	5.600% Senior Notes due 2019	500				37				537
	Total long-term debt	$	1,000			$	52			$	1,052
	-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.
Gains and Losses Resulting from Changes in Fair Value of Interest Rate Swaps and Hedged Fixed Rate Debt	'
	The following table summarizes gains and losses resulting from changes in the fair value of the interest rate swaps and the hedged fixed-rate debt for the periods indicated (dollars in millions):
		Three Months Ended March 31,								Six Months Ended March 31,
		2014				2013				2014			2013
	Gain (loss) on fair value of interest rate swaps	$	(1	)		$	(8	)		$	(12	)	$	(16	)
	Gain (loss) on fair value of hedged fixed-rate debt	1				8				12			16
	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 periods indicated (dollars in millions):
		Amount of Loss Recognized in Other Comprehensive Income (Loss)
		(Effective Portion)
		Three Months Ended March 31,								Six Months Ended March 31,
		2014				2013				2014			2013
	Forward-starting interest rate swaps	$	(9	)		$	—			$	(9	)	$	—
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 Condensed Consolidated Balance Sheets (dollars in millions):
			Balance Sheet Location		March 31,				September 30,
					2014				2013
	Interest rate contracts:
	Pay-variable interest rate swaps designated as fair value hedges		Other assets		$	40			$	52
	Forward-starting interest rate swaps designated as cash flow hedges		Accounts payable and accrued liabilities		$	(9	)		$	—

Capital_Requirements_Tables

Capital Requirements (Tables)	6 Months Ended
	Mar. 31, 2014
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		Required		Net Capital		Net Capital in		Ratio of Net
		Capital		Net Capital		in Excess of		Excess of		Capital to
				(2% of		Required		Early Warning		Aggregate
				Aggregate		Net Capital		Threshold (5%		Debit Balances
				Debit Balances)				of Aggregate
								Debit Balances)
	March 31, 2014	$	1,423	$	266	$	1,157	$	757	10.68	%
	September 30, 2013	$	1,302	$	222	$	1,080	$	746	11.7	%
	TD Ameritrade, Inc.
	Date	Net		Required		Net Capital		Net Capital in
		Capital		Net Capital		in Excess of		Excess of
				(8% of Total		Required		Early Warning
				Risk Margin)		Net Capital		Threshold
								(110% of
								Required
								Net Capital)
	31-Mar-14	$	319	$	11	$	308	$	307
	30-Sep-13	$	305	$	10	$	295	$	294

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]	'
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):
		March 31,			September 30,
		2014			2013
	Client margin securities	$	15.6		$	12.5
	Stock borrowings	1			1.2
	Total collateral available	$	16.6		$	13.7
	Collateral loaned	$	3		$	1.9
	Collateral repledged	2.1			1.8
	Total collateral loaned or repledged	$	5.1		$	3.7
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):
	Assets		Balance Sheet Classification	March 31,			September 30,
				2014			2013
	Cash		Receivable from brokers, dealers and clearing organizations	$	139		$	115
	U.S. government debt securities		Securities owned, at fair value	156			61
	Total			$	295		$	176

Fair_Value_Disclosures_Tables

Fair Value Disclosures (Tables)	6 Months Ended
	Mar. 31, 2014
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 March 31, 2014 and September 30, 2013 (dollars in millions):
		As of March 31, 2014
		Level 1		Level 2		Level 3		Fair Value
	Assets:
	Cash equivalents:
	Money market mutual funds	$	869	$	—	$	—	$	869
	Investments segregated for regulatory purposes:
	U.S. government debt securities	—		3,026		—		3,026
	Securities owned:
	Auction rate securities	—		—		3		3
	Money market and other mutual funds	—		—		1		1
	U.S. government debt securities	—		382		—		382
	Other	1		4		—		5
	Subtotal - Securities owned	1		386		4		391
	Other assets:
	Pay-variable interest rate swaps(1)	—		40		—		40
	U.S. government debt securities	—		4		—		4
	Subtotal - Other assets	—		44		—		44
	Total assets at fair value	$	870	$	3,456	$	4	$	4,330
	Liabilities:
	Accounts payable and accrued liabilities:
	Forward-starting interest rate swaps(2)	$	—	$	9	$	—	$	9
	Securities sold, not yet purchased:
	Equity securities	8		—		—		8
	Total liabilities at fair value	$	8	$	9	$	—	$	17
	-1	See “Fair Value Hedging” in Note 5 for details.
	-2	See "Cash Flow Hedging" in Note 5 for details.
		As of September 30, 2013
		Level 1		Level 2		Level 3		Fair Value
	Assets:
	Cash equivalents:
	Money market mutual funds	$	969	$	—	$	—	$	969
	Investments segregated for regulatory purposes:
	U.S. government debt securities	—		2,045		—		2,045
	Securities owned:
	Auction rate securities	—		—		5		5
	Money market and other mutual funds	—		—		1		1
	U.S. government debt securities	—		313		—		313
	Other	1		3		—		4
	Subtotal - Securities owned	1		316		6		323
	Other assets:
	Equity securities	13		—		—		13
	Pay-variable interest rate swaps(1)	—		52		—		52
	U.S. government debt securities	—		4		—		4
	Subtotal - Other assets	13		56		—		69
	Total assets at fair value	$	983	$	2,417	$	6	$	3,406
	Liabilities:
	Accounts payable and accrued liabilities:
	Securities sold, not yet purchased:
	Equity securities	$	13	$	—	$	—	$	13
	-1	See “Fair Value Hedging” in Note 5 for details.

Offsetting_Assets_and_Liabilit1

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Mar. 31, 2014
Offsetting [Abstract]	'
Effect of Rights of Setoff Associated with Company's Recognized Assets and Liabilities	'
	The following table presents information about the potential effect of rights of setoff associated with the Company’s recognized assets and liabilities as of March 31, 2014 and September 30, 2013 (dollars in millions):
								Gross Amounts Not Offset in the
								Condensed Consolidated
								Balance Sheet
		Gross Amounts		Gross Amounts		Net Amounts		Financial			Collateral			Net Amount (5)
		of Recognized		Offset in the		Presented in		Instruments(3)			Received or
		Assets and		Condensed		the Condensed					Pledged
		Liabilities		Consolidated		Consolidated					(Including
				Balance Sheet		Balance Sheet					Cash) (4)
	31-Mar-14
	Assets:
	Investments segregated for regulatory
	purposes:
	Reverse repurchase agreements	$	1,590	$	—	$	1,590	$	—		$	(1,590	)	$	—
	Receivable from brokers, dealers and
	clearing organizations:
	Deposits paid for securities	956		—		956		(64		)	(876		)	16
	borrowed (1)
	Other assets:
	Pay-variable interest rate swaps	40		—		40		—			(40		)	—
	Total	$	2,586	$	—	$	2,586	$	(64	)	$	(2,506	)	$	16
	Liabilities:
	Payable to brokers, dealers and clearing
	organizations:
	Deposits received for securities	$	2,980	$	—	$	2,980	$	(64	)	$	(2,613	)	$	303
	loaned (2)
	Accounts payable and accrued liabilities:
	Forward-starting interest rate swaps	9		—		9		—			(9		)	—
	Total	$	2,989	$	—	$	2,989	$	(64	)	$	(2,622	)	$	303
	30-Sep-13
	Assets:
	Investments segregated for regulatory
	purposes:
	Reverse repurchase agreements	$	2,618	$	—	$	2,618	$	—		$	(2,618	)	$	—
	Receivable from brokers, dealers and
	clearing organizations:
	Deposits paid for securities	1,220		—		1,220		(168		)	(1,020		)	32
	borrowed (1)
	Other assets:
	Pay-variable interest rate swaps	52		—		52		—			(52		)	—
	Total	$	3,890	$	—	$	3,890	$	(168	)	$	(3,690	)	$	32
	Liabilities:
	Payable to brokers, dealers and clearing
	organizations:
	Deposits received for securities	$	1,948	$	—	$	1,948	$	(168	)	$	(1,561	)	$	219
	loaned (2)
	-1	Included in the gross amounts of deposits paid for securities borrowed is $616 million and $702 million as of March 31, 2014 and September 30, 2013, respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of cash to the Company.
	-2	Included in the gross amounts of deposits received for securities loaned is $792 million and $275 million as of March 31, 2014 and September 30, 2013, respectively, transacted through a risk-sharing program with the OCC, which guarantees the return of securities to the Company.
	-3	Amounts represent recognized assets and liabilities that are subject to enforceable master agreements with rights of setoff.
	-4	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 March 31, 2014 and September 30, 2013, the Company had received total collateral with a fair value of $2,619 million and $3,919 million, respectively, and pledged total collateral with a fair value of $2,700 million and $1,721 million, respectively.
	-5	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_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]	'
Comprehensive Income (Loss)	'
	The following tables present the net change in fair value recorded for each component of other comprehensive income (loss) before and after income tax for the periods indicated (dollars in millions):
		Three Months Ended March 31,
		2014								2013
		Before Tax			Tax Effect		Net of Tax			Before Tax		Tax Effect			Net of Tax
	Investments available-for-sale:
	Net unrealized gain	$	—		$	—	$	—		$	6	$	(2	)	$	4
	Cash flow hedging instruments:
	Net unrealized loss	(9		)	3		(6		)	—		—			—
	Other comprehensive income (loss)	$	(9	)	$	3	$	(6	)	$	6	$	(2	)	$	4
		Six Months Ended March 31,
		2014								2013
		Before Tax			Tax Effect		Net of Tax			Before Tax		Tax Effect			Net of Tax
	Investments available-for-sale:
	Net unrealized gain	$	—		$	—	$	—		$	27	$	(10	)	$	17
	Cash flow hedging instruments:
	Net unrealized loss	(9		)	3		(6		)	—		—			—
	Other comprehensive income (loss)	$	(9	)	$	3	$	(6	)	$	27	$	(10	)	$	17
Schedule of Accumulated Other Comprehensive Income (Loss)	'
	The following table presents after-tax changes in each component of accumulated other comprehensive income (loss) (dollars in millions):
		Three Months Ended March 31,					Six Months Ended March 31,
		2014			2013		2014			2013
	Investments available-for-sale:
	Beginning balance	$	—		$	31	$	—		$	18
	Current period change	—			4		—			17
	Ending balance	$	—		$	35	$	—		$	35
	Cash flow hedging instruments:
	Beginning balance	$	—		$	—	$	—		$	—
	Current period change	(6		)	—		(6		)	—
	Ending balance	$	(6	)	$	—	$	(6	)	$	—
	Total accumulated other comprehensive
	income (loss):
	Beginning balance	$	—		$	31	$	—		$	18
	Current period change	(6		)	4		(6		)	17
	Ending balance	$	(6	)	$	35	$	(6	)	$	35

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	6 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Summary of Revenues Resulting from Transactions with Related Parties	'
	The following tables summarize revenues and expenses resulting from transactions with TD and its affiliates for the periods indicated (dollars in millions):
				Revenues from TD and Affiliates
			Statement of Income	Three months ended March 31,					Six months ended March 31,
	Description		Classification	2014			2013		2014		2013
	Insured Deposit Account Agreement		Insured deposit account fees	$	202		$	200	$	410	$	405
	Referral and Strategic Alliance Agreement		Various	3			3		6		5
	Other		Various	2			—		3		3
	Total revenues			$	207		$	203	$	419	$	413
Summary of Expenses Resulting from Transactions with Related Parties	'
				Expenses to TD and Affiliates
			Statement of Income	Three months ended March 31,					Six months ended March 31,
	Description		Classification	2014			2013		2014		2013
	Canadian Call Center Services Agreement		Professional services	$	5		$	4	$	9	$	9
	Other		Various	2			2		2		2
	Total expenses			$	7		$	6	$	11	$	11
Summary of Classification and Amount of Receivables from and Payables to Affiliates of Company	'
	The following table summarizes the classification and amount of receivables from and payables to TD and its affiliates on the Condensed Consolidated Balance Sheets resulting from related party transactions (dollars in millions):
		March 31,			September 30,
		2014			2013
	Assets:
	Receivable from brokers, dealers and clearing organizations	$	—		$	1
	Receivable from affiliates	117			117
	Liabilities:
	Payable to brokers, dealers and clearing organizations	$	110		$	115
	Payable to affiliates	6			4

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	6 Months Ended
	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Schedule of Condensed Consolidating Balance Sheet (Unaudited)	'
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF MARCH 31, 2014
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	ASSETS
	Cash and cash equivalents	$	157		$	3		$	773		$	—		$	933
	Cash and investments segregated and on	—			—			5,216			—			5,216
	deposit for regulatory purposes
	Receivable from brokers, dealers and	—			—			1,114			—			1,114
	clearing organizations
	Receivable from clients, net	—			—			11,250			—			11,250
	Investments in subsidiaries	5,661			5,548			—			(11,209		)	—
	Receivable from affiliates	8			3			114			(8		)	117
	Goodwill	—			—			2,467			—			2,467
	Acquired intangible assets, net	—			146			650			—			796
	Other, net	135			13			1,087			(41		)	1,194
	Total assets	$	5,961		$	5,713		$	22,671		$	(11,258	)	$	23,087
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Liabilities:
	Payable to brokers, dealers and	$	—		$	—		$	3,032		$	—		$	3,032
	clearing organizations
	Payable to clients	—			—			13,215			—			13,215
	Accounts payable and accrued liabilities	139			—			522			(10		)	651
	Payable to affiliates	—			—			14			(8		)	6
	Notes payable	115			—			—			—			115
	Long-term debt	1,040			—			—			—			1,040
	Other	—			52			340			(31		)	361
	Total liabilities	1,294			52			17,123			(49		)	18,420
	Stockholders’ equity	4,667			5,661			5,548			(11,209		)	4,667
	Total liabilities and stockholders’ equity	$	5,961		$	5,713		$	22,671		$	(11,258	)	$	23,087
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF SEPTEMBER 30, 2013
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	ASSETS
	Cash and cash equivalents	$	199		$	7		$	856		$	—		$	1,062
	Cash and investments segregated and on	—			—			5,894			—			5,894
	deposit for regulatory purposes
	Receivable from brokers, dealers and	—			—			1,348			—			1,348
	clearing organizations
	Receivable from clients, net	—			—			8,984			—			8,984
	Investments in subsidiaries	5,568			5,360			550			(11,478		)	—
	Receivable from affiliates	4			3			117			(7		)	117
	Goodwill	—			—			2,467			—			2,467
	Acquired intangible assets, net	—			146			695			—			841
	Other, net	140			9			1,015			(41		)	1,123
	Total assets	$	5,911		$	5,525		$	21,926		$	(11,526	)	$	21,836
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Liabilities:
	Payable to brokers, dealers and	$	—		$	—		$	1,973		$	—		$	1,973
	clearing organizations
	Payable to clients	—			—			13,183			—			13,183
	Accounts payable and accrued liabilities	180			—			410			(8		)	582
	Payable to affiliates	3			—			8			(7		)	4
	Long-term debt	1,052			—			—			—			1,052
	Other	—			51			348			(33		)	366
	Total liabilities	1,235			51			15,922			(48		)	17,160
	Stockholders’ equity	4,676			5,474			6,004			(11,478		)	4,676
	Total liabilities and stockholders’ equity	$	5,911		$	5,525		$	21,926		$	(11,526	)	$	21,836
Schedule of Condensed Consolidating Statement of Income (Unaudited)	'
	CONDENSED CONSOLIDATING STATEMENT OF INCOME
	THREE MONTHS ENDED MARCH 31, 2014
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	Net revenues	$	4		$	—		$	812		$	(4	)	$	812
	Operating expenses	3			—			490			(4		)	489
	Operating income	1			—			322			—			323
	Other expense	6			—			—			—			6
	Income (loss) before income taxes and equity	(5		)	—			322			—			317
	in income of subsidiaries
	Provision for (benefit from) income taxes	(1		)	—			124			—			123
	Income (loss) before equity in income of	(4		)	—			198			—			194
	subsidiaries
	Equity in income of subsidiaries	198			194			7			(399		)	—
	Net income	$	194		$	194		$	205		$	(399	)	$	194
	CONDENSED CONSOLIDATING STATEMENT OF INCOME
	THREE MONTHS ENDED MARCH 31, 2013
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	Net revenues	$	4		$	—		$	679		$	(4	)	$	679
	Operating expenses	3			—			443			(4		)	442
	Operating income	1			—			236			—			237
	Other expense (income)	7			—			(1		)	—			6
	Income (loss) before income taxes and equity	(6		)	—			237			—			231
	in income of subsidiaries
	Provision for (benefit from) income taxes	(3		)	—			90			—			87
	Income (loss) before equity in income of	(3		)	—			147			—			144
	subsidiaries
	Equity in income of subsidiaries	147			140			8			(295		)	—
	Net income	$	144		$	140		$	155		$	(295	)	$	144
	CONDENSED CONSOLIDATING STATEMENT OF INCOME
	SIX MONTHS ENDED MARCH 31, 2014
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	Net revenues	$	6		$	—		$	1,564		$	(6	)	$	1,564
	Operating expenses	5			—			935			(6		)	934
	Operating income	1			—			629			—			630
	Other expense	12			—			—			—			12
	Income (loss) before income taxes and equity	(11		)	—			629			—			618
	in income of subsidiaries
	Provision for (benefit from) income taxes	(11		)	1			242			—			232
	Income (loss) before equity in income of	—			(1		)	387			—			386
	subsidiaries
	Equity in income of subsidiaries	386			379			17			(782		)	—
	Net income	$	386		$	378		$	404		$	(782	)	$	386
	CONDENSED CONSOLIDATING STATEMENT OF INCOME
	SIX MONTHS ENDED MARCH 31, 2013
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Eliminations			Total
					Subsidiary			Subsidiaries
		(In millions)
	Net revenues	$	8		$	—		$	1,329		$	(7	)	$	1,330
	Operating expenses	7			—			852			(7		)	852
	Operating income	1			—			477			—			478
	Other expense (income)	13			—			(3		)	—			10
	Income (loss) before income taxes and equity	(12		)	—			480			—			468
	in income of subsidiaries
Provision for (benefit from) income taxes	(6		)	1			182			—			177
Income (loss) before equity in income of	(6		)	(1		)	298			—			291
subsidiaries
Equity in income of subsidiaries	297			285			16			(598		)	—
Net income	$	291		$	284		$	314		$	(598	)	$	291
Schedule of Condensed Consolidating Statement of Cash Flows (Unaudited)	'
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	SIX MONTHS ENDED MARCH 31, 2014
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Total
					Subsidiary			Subsidiaries
		(In millions)
	Net cash provided by (used in) operating activities	$	(56	)	$	1		$	241		$	186
	Cash flows from investing activities:
	Purchase of property and equipment	—			—			(37		)	(37		)
	Proceeds from sale of investments	13			—			—			13
	Other	—			—			1			1
	Net cash provided by (used in) investing activities	13			—			(36		)	(23		)
	Cash flows from financing activities:
	Proceeds from notes payable	155			—			—			155
	Principal payments on notes payable	(40		)	—			—			(40		)
	Payment of cash dividends	(408		)	—			—			(408		)
	Purchase of treasury stock	(14		)	—			—			(14		)
	Other, net	15			—			—			15
	Net cash used in financing activities	(292		)	—			—			(292		)
	Intercompany investing and financing activities, net	293			(5		)	(288		)	—
	Net decrease in cash and cash equivalents	(42		)	(4		)	(83		)	(129		)
	Cash and cash equivalents at beginning of period	199			7			856			1,062
	Cash and cash equivalents at end of period	$	157		$	3		$	773		$	933
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	SIX MONTHS ENDED MARCH 31, 2013
	(Unaudited)
		Parent			Guarantor			Non-Guarantor			Total
					Subsidiary			Subsidiaries
		(In millions)
	Net cash provided by (used in) operating activities	$	(41	)	$	—		$	701		$	660
	Cash flows from investing activities:
	Purchase of property and equipment	—			—			(92		)	(92		)
	Proceeds from sale and maturity of short-term investments	150			—			—			150
	Proceeds from sale of investments	—			—			3			3
	Other	—			—			1			1
	Net cash provided by (used in) investing activities	150			—			(88		)	62
	Cash flows from financing activities:
	Principal payments on long-term debt	(250		)	—			—			(250		)
	Proceeds from notes payable	275			—			—			275
	Principal payments on notes payable	(110		)	—			—			(110		)
	Payment of cash dividends	(372		)	—			—			(372		)
	Purchase of treasury stock	(4		)	—			—			(4		)
	Other, net	43			—			(1		)	42
	Net cash used in financing activities	(418		)	—			(1		)	(419		)
	Intercompany investing and financing activities, net	277			—			(277		)	—
	Net increase (decrease) in cash and cash equivalents	(32		)	—			335			303
	Cash and cash equivalents at beginning of period	178			6			731			915
	Cash and cash equivalents at end of period	$	146		$	6		$	1,066		$	1,218

Cash_and_Cash_Equivalents_Summ

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
In Millions, unless otherwise specified
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	$933	$1,062	$1,218	$915
Corporate [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	347	429	'	'
Broker-dealer subsidiaries [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	508	540	'	'
Trust company subsidiary [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	64	74	'	'
Investment advisory subsidiaries [Member]	'	'	'	'
Cash and Cash Equivalents [Line Items]	'	'	'	'
Cash and cash equivalents	$14	$19	'	'

Cash_and_Investments_Segregate2

Cash and Investments Segregated and on Deposit for Regulatory Purposes (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Cash and investments segregated and on deposit for regulatory purposes	$5,216	$5,894
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	1,590	2,618
U.S. Government Debt Securities [Member]	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Cash and investments segregated and on deposit for regulatory purposes	2,976	1,995
Cash in Demand Deposit Accounts [Member]	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Cash and investments segregated and on deposit for regulatory purposes	508	1,154
Cash 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	92	77
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	$50	$50

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]	'	'
Effective income tax rate	37.50%	37.80%
Favorable resolutions of certain income tax matters	$9	'
Unfavorable deferred income tax adjustments	$2	'
Favorable per share impact on earnings	$0.01	'

Notes_Payable_and_LongTerm_Deb2

Notes Payable and Long-Term Debt - Schedule of Notes Payable and Long Term Debt (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]	'	'
Face Value	$1,115	$1,000
Fair Value Adjustment	40	52
Net Carrying Value	1,155	1,052
Notes Payable Parent Revolving Facility [Member]	'	'
Debt Instrument [Line Items]	'	'
Face Value	115	'
Net Carrying Value	115	'
Senior Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Face Value	1,000	'
Fair Value Adjustment	40	'
Net Carrying Value	1,040	'
Senior Notes [Member] | 4.150% Senior Notes due 2014 [Member]	'	'
Debt Instrument [Line Items]	'	'
Face Value	500	500
Fair Value Adjustment	8	15
Net Carrying Value	508	515
Senior Notes [Member] | 5.600% Senior Notes due 2019 [Member]	'	'
Debt Instrument [Line Items]	'	'
Face Value	500	500
Fair Value Adjustment	32	37
Net Carrying Value	$532	$537

Notes_Payable_and_LongTerm_Deb3

Notes Payable and Long-Term Debt - Fair Value Hedging - Additional Information (Detail) (USD $)	6 Months Ended	0 Months Ended		0 Months Ended
	Mar. 31, 2014	Dec. 30, 2009	Dec. 30, 2009	Jan. 07, 2011	Jan. 07, 2011	Mar. 31, 2014
	Interest rate swaps [Member]	4.150% Senior Notes due 2014 [Member]	4.150% Senior Notes due 2014 [Member]	5.600% Senior Notes due 2019 [Member]	5.600% Senior Notes due 2019 [Member]	Senior Notes [Member]
			Interest rate swaps [Member]		Interest rate swaps [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'
Debt instrument interest rate stated percentage	'	4.15%	'	5.60%	'	'
Due date of Senior Notes	'	1-Dec-14	'	1-Dec-19	'	'
Notional amount of interest rate swaps on Notes	'	'	$500,000,000	'	$500,000,000	'
Interest rate swap, variable rate basis	'three-month LIBOR	'	'	'	'	'
Variable interest rate on swaps in excess of LIBOR rate, percentage	'	'	1.25%	'	2.37%	'
Weighted-average effective interest rate	'	'	'	'	'	2.05%

Notes_Payable_and_LongTerm_Deb4

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 $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Debt Disclosure [Abstract]	'	'	'	'
Gain (loss) on fair value of interest rate swaps	($1)	($8)	($12)	($16)
Gain (loss) on fair value of hedged fixed-rate debt	1	8	12	16
Net gain (loss) recorded in interest on borrowings	$0	$0	$0	$0

Recovered_Sheet1

Notes Payable and Long-term Debt - Cash Flow Hedging - Additional Information (Details) (Forward Starting Interest Rate Swap [Member], USD $)	0 Months Ended	6 Months Ended
	Jan. 17, 2014	Mar. 31, 2014
Forward Starting Interest Rate Swap [Member]	'	'
Debt Instrument [Line Items]	'	'
Forward-starting interest rate swap contract settlement date range - end	'	1-Dec-14
Forward-starting interest rate swap contract settlement date range - start	17-Jan-14	'
Aggregate notional amount of forward-starting interest rate swap contracts	$500,000,000	'
Term of LIBOR swap rate used for comparison in forward-starting interest rate swap contracts	'	'10-year LIBOR
Fixed rate of the forward-starting interest rate swap contracts	'	3.34%
Amount of Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	'	$300,000
Description of Reclassification of Interest Rate Cash Flow Hedge Gain (Loss)	'	'12 months

Notes_Payable_and_LongTerm_Deb5

Notes Payable and Long-Term Debt - Effective Portion of Cash Flow Hedge (Details) (Forward Starting Interest Rate Swap [Member], USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Forward Starting Interest Rate Swap [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	($9)	$0	($9)	$0

Notes_Payable_and_LongTerm_Deb6

Notes Payable and Long-Term Debt - Fair Value of Outstanding Derivatives Designated as Hedging Instruments (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Derivatives recorded under the caption Other assets	'	'
Pay-variable interest rate swaps designated as fair value hedges	$40	$52
Derivatives recorded under the caption Accounts Payable And Accrued Liabilities	'	'
Forward-starting interest rate swaps designated as cash flow hedges	($9)	$0

Notes_Payable_and_LongTerm_Deb7

Notes Payable and Long-Term Debt - Balance Sheet Impact of Hedging Instruments - Additional Information (Details) (Cash [Member], USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Forward Starting Interest Rate Swap [Member]	'	'
Debt Instrument [Line Items]	'	'
Pledged Collateral To The Interest Rate Swap Counterparty	$24	'
Pay-Variable Interest Rate Swap [Member]	'	'
Debt Instrument [Line Items]	'	'
Pledged Collateral From Interest Rate Swap Counter Party Aggregate Fair Value	$55	$67

Notes_Payable_and_LongTerm_Deb8

Notes Payable and Long-Term Debt - TD Ameritrade Holding Corporation Credit Agreement - Additional Information (Detail) (USD $)	6 Months Ended				6 Months Ended		0 Months Ended	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 17, 2013	Sep. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 13, 2013	Mar. 31, 2014
					TD Ameritrade Holding Corporation [Member]	TD Ameritrade Holding Corporation [Member]	Senior Unsecured Revolving Credit Facility [Member]	Senior Unsecured Revolving Credit Facility [Member]
							TD Ameritrade Holding Corporation [Member]	TD Ameritrade Holding Corporation [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'
Amount borrowed under Senior unsecured revolving credit facility	$155,000,000	$275,000,000	'	'	$155,000,000	$275,000,000	$155,000,000	'
Per share special cash dividend paid on common stock	'	'	$0.50	'	'	'	'	'
Borrowings outstanding under the Revolving Credit Facility	$115,000,000	'	'	$0	$115,000,000	'	'	$115,000,000
Line of credit facility expiration date	'	'	'	'	'	'	'	28-Jun-14
Debt instrument basis spread on variable rate	'	'	'	'	'	'	'	'one-month LIBOR
Interest rate margin for LIBOR loans	'	'	'	'	'	'	'	1.25%
Senior unsecured revolving credit facility, interest rate at period end	'	'	'	'	'	'	'	1.41%

Capital_Requirements_Additiona

Capital Requirements - Additional Information (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
Net Capital and Net Capital Requirements For Company's Broker Dealer 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%	'
TD Ameritrade Trust Company's Tier 1 capital	$25,000,000	$23,000,000
Amount in excess of required Tier 1 capital	10,000,000	8,000,000
TD Ameritrade Clearing, Inc. [Member]	'	'
Net Capital and Net Capital Requirements For Company's Broker Dealer 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 Broker Dealer Subsidiaries [Line Items]	'	'
Minimum net capital required	250,000	'
Percentage of aggregate debit balances required as minimum net capital	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%	'

Capital_Requirements_Net_Capit

Capital Requirements - Net Capital and Net Capital Requirements for Company's Broker-dealer Subsidiaries (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
TD Ameritrade Clearing, Inc. [Member]	'	'
Net Capital and Net Capital Requirements For Company's Broker Dealer Subsidiaries [Line Items]	'	'
Net Capital	$1,423	$1,302
Required Net Capital	266	222
Net Capital in Excess of Required Net Capital	1,157	1,080
Net Capital in Excess of Early Warning Threshold	757	746
Ratio of Net Capital to Aggregate Debit Balances	10.68%	11.70%
TD Ameritrade, Inc. [Member]	'	'
Net Capital and Net Capital Requirements For Company's Broker Dealer Subsidiaries [Line Items]	'	'
Net Capital	319	305
Required Net Capital	11	10
Net Capital in Excess of Required Net Capital	308	295
Net Capital in Excess of Early Warning Threshold	$307	$294

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended	12 Months Ended
	Feb. 28, 2011	Mar. 31, 2014	Sep. 30, 2008	Jan. 27, 2011	Jul. 23, 2010
Contingencies And Commitments [Line Items]	'	'	'	'	'
Yield Plus Fund's stated objective to maintain a per share net asset value	'	'	$1	'	'
Approximate percentage of the Yield Plus Fund assets which have been distributed	'	'	'	'	94.80%
Approximate remaining total assets in Yield Plus Fund	'	'	'	'	$39,700,000
Approximate percentage of Yield Plus Fund held by TD Ameritrade, Inc. clients	'	79.00%	'	'	'
Per share amount payable to all eligible clients that purchased shares of the yield plus fund and continued to own those shares	'	'	'	$0.01	'
Amount paid to clients under the SEC yield plus fund settlement agreement	10,000,000	'	'	'	'
Company's estimate of its clients current aggregate shortfall in the Yield Plus Fund	'	36,000,000	'	'	'
Contingent liability for guarantees to securities clearinghouses and exchanges	'	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	'	$40,000,000	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Collateral Available, Loaned or Repledged (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Billions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'	'
Client margin securities	$15.60	$12.50
Stock borrowings	1	1.2
Total collateral available	16.6	13.7
Collateral loaned	3	1.9
Collateral repledged	2.1	1.8
Total collateral loaned or repledged	$5.10	$3.70

Commitments_and_Contingencies_3

Commitments and Contingencies - Summary of Cash Deposited with and Securities Pledged to Clearinghouses (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Cash Deposited with and Securities Pledged to Clearinghouses [Line Items]	'	'
Cash deposited and securities pledged	$295	$176
Cash [Member] | Receivable from brokers, dealers and clearing organizations [Member]	'	'
Cash Deposited with and Securities Pledged to Clearinghouses [Line Items]	'	'
Cash deposited and securities pledged	139	115
U.S. Government Debt Securities [Member] | Securities owned [Member]	'	'
Cash Deposited with and Securities Pledged to Clearinghouses [Line Items]	'	'
Cash deposited and securities pledged	$156	$61

Fair_Value_Disclosures_Fair_Va

Fair Value Disclosures - Fair Value Hierarchy for Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
In Millions, unless otherwise specified
Assets:	'	'	'	'
Cash equivalents	$933	$1,062	$1,218	$915
Investments segregated for regulatory purposes	5,216	5,894	'	'
Securities owned	391	323	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	651	582	'	'
Fair Value, Measurements, Recurring [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	391	323	'	'
Other assets	44	69	'	'
Total assets at fair value	4,330	3,406	'	'
Liabilities:	'	'	'	'
Total liabilities at fair value	17	'	'	'
Fair Value, Measurements, Recurring [Member] | Money Market Mutual Funds [Member]	'	'	'	'
Assets:	'	'	'	'
Cash equivalents	869	969	'	'
Fair Value, Measurements, Recurring [Member] | U.S. Government Debt Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Investments segregated for regulatory purposes	3,026	2,045	'	'
Securities owned	382	313	'	'
Other assets	4	4	'	'
Fair Value, Measurements, Recurring [Member] | Auction Rate Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	3	5	'	'
Fair Value, Measurements, Recurring [Member] | Money Market and Other Mutual Funds [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	1	1	'	'
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	5	4	'	'
Fair Value, Measurements, Recurring [Member] | Interest rate swaps [Member]	'	'	'	'
Assets:	'	'	'	'
Other assets	40	52	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	9	'	'	'
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Other assets	'	13	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	8	13	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	1	1	'	'
Other assets	'	13	'	'
Total assets at fair value	870	983	'	'
Liabilities:	'	'	'	'
Total liabilities at fair value	8	'	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Mutual Funds [Member]	'	'	'	'
Assets:	'	'	'	'
Cash equivalents	869	969	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	1	1	'	'
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Other assets	'	13	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	8	13	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	386	316	'	'
Other assets	44	56	'	'
Total assets at fair value	3,456	2,417	'	'
Liabilities:	'	'	'	'
Total liabilities at fair value	9	'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Mutual Funds [Member]	'	'	'	'
Assets:	'	'	'	'
Cash equivalents	0	0	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Government Debt Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Investments segregated for regulatory purposes	3,026	2,045	'	'
Securities owned	382	313	'	'
Other assets	4	4	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	4	3	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Interest rate swaps [Member]	'	'	'	'
Assets:	'	'	'	'
Other assets	40	52	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	9	'	'	'
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	0	0	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	4	6	'	'
Total assets at fair value	4	6	'	'
Liabilities:	'	'	'	'
Total liabilities at fair value	0	'	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Mutual Funds [Member]	'	'	'	'
Assets:	'	'	'	'
Cash equivalents	0	0	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Auction Rate Securities [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	3	5	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Money Market and Other Mutual Funds [Member]	'	'	'	'
Assets:	'	'	'	'
Securities owned	1	1	'	'
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]	'	'	'	'
Liabilities:	'	'	'	'
Accounts payable and accrued liabilities	$0	$0	'	'

Fair_Value_Disclosures_Additio

Fair Value Disclosures - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
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	$1,081	$1,100
Long-term debt	$1,040	$1,052

Offsetting_Assets_and_Liabilit2

Offsetting Assets and Liabilities - Effect of Rights of Setoff Associated with Company's Recognized Assets and Liabilities (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Offsetting Assets And Liabilities [Line Items]	'	'
Gross Amounts of Recognized Assets	$2,586	$3,890
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	2,586	3,890
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	-64	-168
Gross Amounts of Collateral Received (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-2,506	-3,690
Net Amounts of Recognized Assets Subject to Master Netting Arrangements	16	32
Gross Amounts of Recognized Liabilities	2,989	'
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	'
Net Amounts Presented in the Condensed Consolidated Balance Sheet	2,989	'
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	-64	'
Gross Amounts of Collateral Pledged (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-2,622	'
Net Amounts of Recognized Liabilities Subject to Master Netting Arrangements	303	'
Other assets [Member] | Interest rate swaps [Member]	'	'
Offsetting Assets And Liabilities [Line Items]	'	'
Gross Amounts of Recognized Assets	40	52
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	40	52
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	0	0
Gross Amounts of Collateral Received (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-40	-52
Net Amounts of Recognized Assets Subject to Master Netting Arrangements	0	0
Accounts Payable and Accrued Liabilities [Member] | Interest rate swaps [Member]	'	'
Offsetting Assets And Liabilities [Line Items]	'	'
Gross Amounts of Recognized Liabilities	9	'
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	'
Net Amounts Presented in the Condensed Consolidated Balance Sheet	9	'
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	0	'
Gross Amounts of Collateral Pledged (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-9	'
Net Amounts of Recognized Liabilities Subject to Master Netting Arrangements	0	'
Deposits Paid For Securities Borrowed [Member] | Receivable from brokers, dealers and clearing organizations [Member]	'	'
Offsetting Assets And Liabilities [Line Items]	'	'
Gross Amounts of Recognized Assets	956	1,220
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	956	1,220
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	-64	-168
Gross Amounts of Collateral Received (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-876	-1,020
Net Amounts of Recognized Assets Subject to Master Netting Arrangements	16	32
Deposits Received For Securities Loaned [Member] | Payable to brokers, dealers and clearing organizations [Member]	'	'
Offsetting Assets And Liabilities [Line Items]	'	'
Gross Amounts of Recognized Liabilities	2,980	1,948
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	2,980	1,948
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	-64	-168
Gross Amounts of Collateral Pledged (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-2,613	-1,561
Net Amounts of Recognized Liabilities Subject to Master Netting Arrangements	303	219
Reverse Repurchase Agreements [Member] | Investments segregated for regulatory purposes [Member]	'	'
Offsetting Assets And Liabilities [Line Items]	'	'
Gross Amounts of Recognized Assets	1,590	2,618
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	1,590	2,618
Gross Amounts of Financial Instruments Not Offset in the Condensed Consolidated Balance Sheet	0	0
Gross Amounts of Collateral Received (Including Cash) Not Offset in the Condensed Consolidated Balance Sheet	-1,590	-2,618
Net Amounts of Recognized Assets Subject to Master Netting Arrangements	$0	$0

Offsetting_Assets_and_Liabilit3

Offsetting Assets and Liabilities - Effect of Rights of Setoff Associated with Company's Recognized Assets and Liabilities (Parenthetical) (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Offsetting Assets And Liabilities [Line Items]	'	'
Fair value of collateral the Company has received under enforceable master agreements, limited for table presentation purposes to the net amount of the recognized assets due from each counterparty	$2,619	$3,919
Fair value of collateral the Company has pledged under enforceable master agreements, limited for table presentation purposes to the net amount of the recognized liabilities due to each counterparty	2,700	1,721
Transacted Through The Option Clearing Corporation [Member]	'	'
Offsetting Assets And Liabilities [Line Items]	'	'
Gross amounts of deposits paid for securities borrowed	616	702
Gross amounts of deposits received for securities loaned	$792	$275

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) Net Change (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Abstract]	'	'	'	'
Total other comprehensive income (loss), before tax	($9)	$6	($9)	$27
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	3	-2	3	-10
Total other comprehensive income (loss), net of tax	-6	4	-6	17
Available-for-sale Securities [Abstract]	'	'	'	'
Net unrealized gain	0	6	0	27
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	-2	0	-10
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	0	4	0	17
Cash Flow Hedging Instruments [Abstract]	'	'	'	'
Net unrealized loss	-9	0	-9	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	3	0	3	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	($6)	$0	($6)	$0

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) Balance Rollforward (Details) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) Balance Rollforward [Line Items]	'	'	'	'
Beginning balance	$0	$31	$0	$18
Current period change	-6	4	-6	17
Ending balance	-6	35	-6	35
InvestmentsAvailableForSale [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) Balance Rollforward [Line Items]	'	'	'	'
Beginning balance	0	31	0	18
Current period change	0	4	0	17
Ending balance	0	35	0	35
Forward Starting Interest Rate Swap [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) Balance Rollforward [Line Items]	'	'	'	'
Beginning balance	0	0	0	0
Current period change	-6	0	-6	0
Ending balance	($6)	$0	($6)	$0

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'	'	'
Antidilutive shares excluded from the calculation of diluted EPS	0	200,000	0	1,400,000

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	6 Months Ended
	Mar. 31, 2014
	board_of_directors_member
Related Party Transaction [Line Items]	'
Toronto-Dominion Bank percentage of ownership in the Company	40.00%
Toronto-Dominion Bank's right to designate to the Company's board of directors	5
Board of Directors Total Members	12
Adjustments required to adjust variable rate leg of interest rate swaps under current IDA Agreement	'1 month
Contingent liability carried on the condensed consolidated balance sheets for the Insured Deposit Account Agreement	$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%
New IDA Agreement [Member]	'
Related Party Transaction [Line Items]	'
Agreement effective date	1-Jan-13
Agreement expiration date	1-Jul-18
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	2
Percentage of fixed rate notional investments	79.00%
Percentage of floating rate investments	21.00%
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
New IDA Agreement [Member] | Minimum [Member]	'
Related Party Transaction [Line Items]	'
Servicing fee percentage (in basis points)	0.03%
New 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
New 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_Sum

Related Party Transactions - Summary of Revenues Resulting from Transactions with Related Parties (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction [Line Items]	'	'	'	'
Revenues from TD and Affiliates	$207	$203	$419	$413
Insured Deposit Account Fees [Member] | Insured Deposit Account Agreement [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
Revenues from TD and Affiliates	202	200	410	405
Various [Member] | Referral and Strategic Alliance Agreement [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
Revenues from TD and Affiliates	3	3	6	5
Various [Member] | Other [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
Revenues from TD and Affiliates	$2	$0	$3	$3

Related_Party_Transactions_Sum1

Related Party Transactions - Summary of Expenses Resulting from Transactions with Related Parties (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction [Line Items]	'	'	'	'
Expenses to TD and Affiliates	$7	$6	$11	$11
Professional Services [Member] | Canadian Call Center Services Agreement [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
Expenses to TD and Affiliates	5	4	9	9
Various [Member] | Other [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
Expenses to TD and Affiliates	$2	$2	$2	$2

Related_Party_Transactions_Sum2

Related Party Transactions - Summary of Classification and Amount of Receivables from and Payables to Affiliates of Company (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Assets:	'	'
Receivable from brokers, dealers and clearing organizations	$1,114	$1,348
Receivable from affiliates	117	117
Liabilities:	'	'
Payable to brokers, dealers and clearing organizations	3,032	1,973
Payable to affiliates	6	4
Related Party Assets [Member]	'	'
Assets:	'	'
Receivable from brokers, dealers and clearing organizations	0	1
Receivable from affiliates	117	117
Related Party Liabilities [Member]	'	'
Liabilities:	'	'
Payable to brokers, dealers and clearing organizations	110	115
Payable to affiliates	$6	$4

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Unaudited) (Detail) (USD $)	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
ASSETS	'	'	'	'
Cash and cash equivalents	$933,000,000	$1,062,000,000	$1,218,000,000	$915,000,000
Cash and investments segregated and on deposit for regulatory purposes	5,216,000,000	5,894,000,000	'	'
Receivable from brokers, dealers and clearing organizations	1,114,000,000	1,348,000,000	'	'
Receivable from clients, net	11,250,000,000	8,984,000,000	'	'
Investments in subsidiaries	0	0	'	'
Receivable from affiliates	117,000,000	117,000,000	'	'
Goodwill	2,467,000,000	2,467,000,000	'	'
Acquired intangible assets, net	796,000,000	841,000,000	'	'
Other, net	1,194,000,000	1,123,000,000	'	'
Total assets	23,087,000,000	21,836,000,000	'	'
Liabilities:	'	'	'	'
Payable to brokers, dealers and clearing organizations	3,032,000,000	1,973,000,000	'	'
Payable to clients	13,215,000,000	13,183,000,000	'	'
Accounts payable and accrued liabilities	651,000,000	582,000,000	'	'
Payable to affiliates	6,000,000	4,000,000	'	'
Notes payable	115,000,000	0	'	'
Long-term debt	1,040,000,000	1,052,000,000	'	'
Other	361,000,000	366,000,000	'	'
Total liabilities	18,420,000,000	17,160,000,000	'	'
Stockholders’ equity	4,667,000,000	4,676,000,000	'	'
Total liabilities and stockholders’ equity	23,087,000,000	21,836,000,000	'	'
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	-11,209,000,000	-11,478,000,000	'	'
Receivable from affiliates	-8,000,000	-7,000,000	'	'
Goodwill	0	0	'	'
Acquired intangible assets, net	0	0	'	'
Other, net	-41,000,000	-41,000,000	'	'
Total assets	-11,258,000,000	-11,526,000,000	'	'
Liabilities:	'	'	'	'
Payable to brokers, dealers and clearing organizations	0	0	'	'
Payable to clients	0	0	'	'
Accounts payable and accrued liabilities	-10,000,000	-8,000,000	'	'
Payable to affiliates	-8,000,000	-7,000,000	'	'
Notes payable	0	'	'	'
Long-term debt	0	0	'	'
Other	-31,000,000	-33,000,000	'	'
Total liabilities	-49,000,000	-48,000,000	'	'
Stockholders’ equity	-11,209,000,000	-11,478,000,000	'	'
Total liabilities and stockholders’ equity	-11,258,000,000	-11,526,000,000	'	'
Parent [Member]	'	'	'	'
ASSETS	'	'	'	'
Cash and cash equivalents	157,000,000	199,000,000	146,000,000	178,000,000
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	5,661,000,000	5,568,000,000	'	'
Receivable from affiliates	8,000,000	4,000,000	'	'
Goodwill	0	0	'	'
Acquired intangible assets, net	0	0	'	'
Other, net	135,000,000	140,000,000	'	'
Total assets	5,961,000,000	5,911,000,000	'	'
Liabilities:	'	'	'	'
Payable to brokers, dealers and clearing organizations	0	0	'	'
Payable to clients	0	0	'	'
Accounts payable and accrued liabilities	139,000,000	180,000,000	'	'
Payable to affiliates	0	3,000,000	'	'
Notes payable	115,000,000	'	'	'
Long-term debt	1,040,000,000	1,052,000,000	'	'
Other	0	0	'	'
Total liabilities	1,294,000,000	1,235,000,000	'	'
Stockholders’ equity	4,667,000,000	4,676,000,000	'	'
Total liabilities and stockholders’ equity	5,961,000,000	5,911,000,000	'	'
Guarantor Subsidiary [Member]	'	'	'	'
ASSETS	'	'	'	'
Cash and cash equivalents	3,000,000	7,000,000	6,000,000	6,000,000
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	5,548,000,000	5,360,000,000	'	'
Receivable from affiliates	3,000,000	3,000,000	'	'
Goodwill	0	0	'	'
Acquired intangible assets, net	146,000,000	146,000,000	'	'
Other, net	13,000,000	9,000,000	'	'
Total assets	5,713,000,000	5,525,000,000	'	'
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	'	'
Other	52,000,000	51,000,000	'	'
Total liabilities	52,000,000	51,000,000	'	'
Stockholders’ equity	5,661,000,000	5,474,000,000	'	'
Total liabilities and stockholders’ equity	5,713,000,000	5,525,000,000	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'
ASSETS	'	'	'	'
Cash and cash equivalents	773,000,000	856,000,000	1,066,000,000	731,000,000
Cash and investments segregated and on deposit for regulatory purposes	5,216,000,000	5,894,000,000	'	'
Receivable from brokers, dealers and clearing organizations	1,114,000,000	1,348,000,000	'	'
Receivable from clients, net	11,250,000,000	8,984,000,000	'	'
Investments in subsidiaries	0	550,000,000	'	'
Receivable from affiliates	114,000,000	117,000,000	'	'
Goodwill	2,467,000,000	2,467,000,000	'	'
Acquired intangible assets, net	650,000,000	695,000,000	'	'
Other, net	1,087,000,000	1,015,000,000	'	'
Total assets	22,671,000,000	21,926,000,000	'	'
Liabilities:	'	'	'	'
Payable to brokers, dealers and clearing organizations	3,032,000,000	1,973,000,000	'	'
Payable to clients	13,215,000,000	13,183,000,000	'	'
Accounts payable and accrued liabilities	522,000,000	410,000,000	'	'
Payable to affiliates	14,000,000	8,000,000	'	'
Notes payable	0	'	'	'
Long-term debt	0	0	'	'
Other	340,000,000	348,000,000	'	'
Total liabilities	17,123,000,000	15,922,000,000	'	'
Stockholders’ equity	5,548,000,000	6,004,000,000	'	'
Total liabilities and stockholders’ equity	$22,671,000,000	$21,926,000,000	'	'

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Income (Unaudited) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Condensed Income Statements, Captions [Line Items]	'	'	'	'
Net revenues	$812	$679	$1,564	$1,330
Operating expenses	489	442	934	852
Operating income	323	237	630	478
Other expense	6	6	12	10
Pre-tax income	317	231	618	468
Provision for (benefit from) income taxes	123	87	232	177
Income (loss) before equity in income of subsidiaries	194	144	386	291
Equity in income of subsidiaries	0	0	0	0
Net income	194	144	386	291
Eliminations [Member]	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'
Net revenues	-4	-4	-6	-7
Operating expenses	-4	-4	-6	-7
Operating income	0	0	0	0
Other expense	0	0	0	0
Pre-tax income	0	0	0	0
Provision for (benefit from) income taxes	0	0	0	0
Income (loss) before equity in income of subsidiaries	0	0	0	0
Equity in income of subsidiaries	-399	-295	-782	-598
Net income	-399	-295	-782	-598
Parent [Member]	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'
Net revenues	4	4	6	8
Operating expenses	3	3	5	7
Operating income	1	1	1	1
Other expense	6	7	12	13
Pre-tax income	-5	-6	-11	-12
Provision for (benefit from) income taxes	-1	-3	-11	-6
Income (loss) before equity in income of subsidiaries	-4	-3	0	-6
Equity in income of subsidiaries	198	147	386	297
Net income	194	144	386	291
Guarantor Subsidiary [Member]	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'
Net revenues	0	0	0	0
Operating expenses	0	0	0	0
Operating income	0	0	0	0
Other expense	0	0	0	0
Pre-tax income	0	0	0	0
Provision for (benefit from) income taxes	0	0	1	1
Income (loss) before equity in income of subsidiaries	0	0	-1	-1
Equity in income of subsidiaries	194	140	379	285
Net income	194	140	378	284
Non-Guarantor Subsidiaries [Member]	'	'	'	'
Condensed Income Statements, Captions [Line Items]	'	'	'	'
Net revenues	812	679	1,564	1,329
Operating expenses	490	443	935	852
Operating income	322	236	629	477
Other expense	0	-1	0	-3
Pre-tax income	322	237	629	480
Provision for (benefit from) income taxes	124	90	242	182
Income (loss) before equity in income of subsidiaries	198	147	387	298
Equity in income of subsidiaries	7	8	17	16
Net income	$205	$155	$404	$314

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Unaudited) (Detail) (USD $)	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]	'	'
Net cash provided by (used in) operating activities	$186,000,000	$660,000,000
Cash flows from investing activities:	'	'
Purchase of property and equipment	-37,000,000	-92,000,000
Proceeds from sale and maturity of short-term investments	0	150,000,000
Proceeds from sale of investments	13,000,000	3,000,000
Other	1,000,000	1,000,000
Net cash provided by (used in) investing activities	-23,000,000	62,000,000
Cash flows from financing activities:	'	'
Principal payments on long-term debt	0	-250,000,000
Proceeds from notes payable	155,000,000	275,000,000
Principal payments on notes payable	-40,000,000	-110,000,000
Payment of cash dividends	-408,000,000	-372,000,000
Purchase of treasury stock	-14,000,000	-4,000,000
Other, net	15,000,000	42,000,000
Net cash used in financing activities	-292,000,000	-419,000,000
Intercompany investing and financing activities, net	0	0
Net increase (decrease) in cash and cash equivalents	-129,000,000	303,000,000
Cash and cash equivalents at beginning of period	1,062,000,000	915,000,000
Cash and cash equivalents at end of period	933,000,000	1,218,000,000
Parent [Member]	'	'
Condensed Cash Flow Statements, Captions [Line Items]	'	'
Net cash provided by (used in) operating activities	-56,000,000	-41,000,000
Cash flows from investing activities:	'	'
Purchase of property and equipment	0	0
Proceeds from sale and maturity of short-term investments	'	150,000,000
Proceeds from sale of investments	13,000,000	0
Other	0	0
Net cash provided by (used in) investing activities	13,000,000	150,000,000
Cash flows from financing activities:	'	'
Principal payments on long-term debt	'	-250,000,000
Proceeds from notes payable	155,000,000	275,000,000
Principal payments on notes payable	-40,000,000	-110,000,000
Payment of cash dividends	-408,000,000	-372,000,000
Purchase of treasury stock	-14,000,000	-4,000,000
Other, net	15,000,000	43,000,000
Net cash used in financing activities	-292,000,000	-418,000,000
Intercompany investing and financing activities, net	293,000,000	277,000,000
Net increase (decrease) in cash and cash equivalents	-42,000,000	-32,000,000
Cash and cash equivalents at beginning of period	199,000,000	178,000,000
Cash and cash equivalents at end of period	157,000,000	146,000,000
Guarantor Subsidiary [Member]	'	'
Condensed Cash Flow Statements, Captions [Line Items]	'	'
Net cash provided by (used in) operating activities	1,000,000	0
Cash flows from investing activities:	'	'
Purchase of property and equipment	0	0
Proceeds from sale and maturity of short-term investments	'	0
Proceeds from sale of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:	'	'
Principal payments on long-term debt	'	0
Proceeds from notes payable	0	0
Principal payments on notes payable	0	0
Payment of cash dividends	0	0
Purchase of treasury stock	0	0
Other, net	0	0
Net cash used in financing activities	0	0
Intercompany investing and financing activities, net	-5,000,000	0
Net increase (decrease) in cash and cash equivalents	-4,000,000	0
Cash and cash equivalents at beginning of period	7,000,000	6,000,000
Cash and cash equivalents at end of period	3,000,000	6,000,000
Non-Guarantor Subsidiaries [Member]	'	'
Condensed Cash Flow Statements, Captions [Line Items]	'	'
Net cash provided by (used in) operating activities	241,000,000	701,000,000
Cash flows from investing activities:	'	'
Purchase of property and equipment	-37,000,000	-92,000,000
Proceeds from sale and maturity of short-term investments	'	0
Proceeds from sale of investments	0	3,000,000
Other	1,000,000	1,000,000
Net cash provided by (used in) investing activities	-36,000,000	-88,000,000
Cash flows from financing activities:	'	'
Principal payments on long-term debt	'	0
Proceeds from notes payable	0	0
Principal payments on notes payable	0	0
Payment of cash dividends	0	0
Purchase of treasury stock	0	0
Other, net	0	-1,000,000
Net cash used in financing activities	0	-1,000,000
Intercompany investing and financing activities, net	-288,000,000	-277,000,000
Net increase (decrease) in cash and cash equivalents	-83,000,000	335,000,000
Cash and cash equivalents at beginning of period	856,000,000	731,000,000
Cash and cash equivalents at end of period	$773,000,000	$1,066,000,000