Name:	gac_FirstLetterOfCreditReceivedAsCollateralUnderReinsuranceArrangement
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents interest rate on withheld funds assets under reinsurance agreement.

No definition available.

Name:	gac_FundsHeldUnderReinsuranceAgreementsAssetInterestRate
Namespace Prefix:	gac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Number of letters of credit obtained by the parent company for the benefit of the entity as collateral under the reinsurance agreement for policy liabilities and capital support.

No definition available.

Name:	gac_NumberOfLettersOfCreditObtainedByParentForBenefitOfRelatedPartyUnderReinsuranceAgreement
Namespace Prefix:	gac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents guaranteed interest annuity contracts purchases under separate accounts.

No definition available.

Name:	gac_RelatedPartyTransactionPurchasesUnderGuaranteedInterestAnnuityIncludedInSeperateContracts
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the reduction in separate account assets and liabilities arising from transactions with related parties so as to eliminate these amounts in the consolidated balance sheets.

No definition available.

Name:	gac_RelatedPartyTransactionReductionInSeparateAccountAssetsAndLiabilitiesOnConsolidation
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the second letter of credit received as collateral under the reinsurance agreement for policy liabilities and capital support.

No definition available.

Name:	gac_SecondLetterOfCreditReceivedAsCollateralUnderReinsuranceArrangement
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.2,10)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2, 10

-Article 7

Name:	us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fees earned for providing investment advice and research to customers. Such services may include the investment management of mutual funds and separate accounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(a),(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 9, 51, 59, 80

-IssueDate 2006-05-01

-Chapter 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.