Name:	gac_LineOfCreditFacilityQuarterlyAdjustedNetWorthValuationRequiredBasicAmount
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the percentage of the net income of the entity required to be added to the base net worth for determining the quarterly adjusted net worth under the line of credit facility agreement.

No definition available.

Name:	gac_LineOfCreditFacilityQuarterlyAdjustedNetWorthValuationRequiredPercentageOfNetIncome
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

- Details

Name:	gac_ScheduleOfCommitmentsLineItems
Namespace Prefix:	gac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the amount of unfunded commitments of the entity, all of which is due within one year from the dates indicated.

No definition available.

Name:	gac_UnfundedCommitmentsDueWithinOneYear
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of unfunded commitments related to cost method investments of the entity, all of which is due within one year from the dates indicated.

No definition available.

Name:	gac_UnfundedCommitmentsDueWithinOneYearRelatedToCostMethodInvestments
Namespace Prefix:	gac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount borrowed under the credit facility as of the balance sheet date.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5