Name:	ck0000839759_AssumedLifeAndAnnuityInterestCreditedToContractholderFunds
Namespace Prefix:	ck0000839759_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Interest credited to contractholder funds which has been directly incurred and expensed during the period for life and annuity insurance contracts, as well as accident and health insurance contracts.

No definition available.

Name:	ck0000839759_DirectLifeAndAnnuityInterestCreditedToContractholderFunds
Namespace Prefix:	ck0000839759_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount in the period for the estimated recoupment of interest credited expenses under annuity contracts ceded.

No definition available.

Name:	ck0000839759_ReinsuranceCededInterestCreditedToPolicyholdersAccountBalances
Namespace Prefix:	ck0000839759_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.6)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 45
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385