Name:	ck0000839759_AssumedLifeAndAnnuityPremiumsAndContractCharges
Namespace Prefix:	ck0000839759_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Premiums and contract charges related to life insurance, accident and health insurance and annuity contracts that are assumed and earned by another insurer as a result of reinsurance arrangements.

No definition available.

Name:	ck0000839759_CededLifeAndAnnuityPremiumsAndContractCharges
Namespace Prefix:	ck0000839759_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Premiums and contract charges related to life insurance, accident and health insurance and annuity contracts that are written and earned directly by the insurer before adding contracts assumed from other insurers or subtracting any amounts assumed by other insurers.

No definition available.

Name:	ck0000839759_DirectLifeAndAnnuityPremiumsAndContractCharges
Namespace Prefix:	ck0000839759_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Premiums recognized as revenue in the period on all life insurance and reinsurance contracts, as well as accident and health insurance and reinsurance contracts, after subtracting any amounts ceded to another insurer. Also includes an amount that an insurer adds to a policy's premium, or deducts from a policy's cash value or contract holder's account, as compensation for services rendered (may include fees), after subtracting any amounts ceded to another insurer.

No definition available.

Name:	ck0000839759_LifeAndAnnuityPremiumsAndContractChargesNetOfReinsuranceCeded
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.