Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 07, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Registrant Name	PRUDENTIAL ANNUITIES LIFE ASSURANCE CORP/CT
Entity Central Index Key	0000881453
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float	$ 0
Entity Current Reporting Status	Yes