Fair Value of Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Transfers Between Level 1 and Level 2	$ 0	$ 0

Fair Value Measurement Recurring Basis Asset And Liabilities Transfers Out Of Level 1 Into Level 2

No definition available.

Name:	cik881453_FairValueMeasurementRecurringBasisAssetAndLiabilitiesTransfersOutOfLevel1IntoLevel2
Namespace Prefix:	cik881453_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration