Name:	amtd_InsuredDepositAccountDepositThresholdForFloatingRateOrShortTermFixedRateNotionalInvestmentsSubjectToServicingFeeAdjustment
Namespace Prefix:	amtd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Designated deposit amount related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountDesignatedDepositAmount
Namespace Prefix:	amtd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The minimum federal funds effective rate related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountEventOneFederalFundsEffectiveRateMinimum
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Minimum rate on five-year U.S. dollar interest rate swaps for 20 consecutive business days related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountEventTwoFiveYearUsDollarInterestRateSwapRateMinimum
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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 Event 1 and Event 2 are fulfilled related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountEventTwoNumberOfConsecutiveBusinessDaysRequiredAboveMinimumRateOnUsDollarInterestRateSwapsForReductionInRateEarnedByCompany
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Gross fixed yield earned related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountGrossFixedYieldEarned
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Maximum reduction to rate on new fixed-rate notional investments earned by the entity in the case event 1 and event 2 are fulfilled.

No definition available.

Name:	amtd_InsuredDepositAccountMaximumReductionToRateOnNewFixedRateNotionalInvestmentsEarnedByEntity
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Number of primary components of the fee earned related to the Insured Deposit Account.

No definition available.

Name:	amtd_InsuredDepositAccountNumberOfPrimaryComponentsOfFeeEarned
Namespace Prefix:	amtd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage of fixed rate notional investments related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountPercentageOfFixedRateNotionalInvestments
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of floating rate investments related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountPercentageOfFloatingRateInvestments
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Rate of applicable swaps related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountRateOfApplicableSwaps
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Reduction rate used on excess of swap rate over U.S. dollar interest rate swap for 20 consecutive days for reduction in rate earned by Company in the case Event 1 and Event 2 are fulfilled related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountReductionRateUsedOnExcessOfSwapRateOverUSDollarInterestRate
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Reset frequency of adjustments required to adjust variable rate leg of interest rate swaps related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountResetFrequencyOfAdjustmentsRequiredToAdjustVariableRateLegOfInterestRateSwaps
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Servicing fee percentage related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountServicingFeePercentage
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Term of short-term fixed-rate notional investments related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountShortTermFixedRateNotionalInvestmentsTerm
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of applicable swaps related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountTermOfApplicableSwaps
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of deposits invested in fixed rate investments related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountTermOfDepositsInvestedInFixedRateInvestments
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of U.S. dollar interest rate swaps related to the insured deposit account.

No definition available.

Name:	amtd_InsuredDepositAccountTermOfUSDollarInterestRateSwaps
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Lending Commitment Received From Related Party

No definition available.

Name:	amtd_LendingCommitmentReceivedFromRelatedParty
Namespace Prefix:	amtd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Total number of Board of Directors members of the entity.

No definition available.

Name:	amtd_NumberofBoardofDirectorsMembers
Namespace Prefix:	amtd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

A related party's right to designate a number of directors on the Company's Board of Directors.

No definition available.

Name:	amtd_NumberofBoardofDirectorsMembersDesignatedByRelatedParty
Namespace Prefix:	amtd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Successive renewal terms for related party agreement.

No definition available.

Name:	amtd_RelatedPartyTransactionAgreementSuccessiveRenewalTerm
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Prior written notice period for termination of related party agreement by any party.

No definition available.

Name:	amtd_RelatedPartyTransactionNonRenewalTermsPriorWrittenNoticePeriodForTermination
Namespace Prefix:	amtd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

A related party's percentage ownership in the entity.

No definition available.

Name:	amtd_RelatedPartyTransactionPercentageOwnershipInEntity
Namespace Prefix:	amtd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_PrincipalOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=amtd_InsuredDepositAccountAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DerivativeInstrumentRiskAxis=amtd_NewFixedRateNotionalInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=amtd_InsuredDepositAccountAgreementFeeExampleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=amtd_TDAmeritradeHoldingCorporationandTDAmeritradeClearingInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: