Shareholder Report, Average Annual Return (Details) DFFM_Dimensional VIT Inflation-Protected Securities Portfolio_Institutional_TSR Annual {Institutional}	12 Months Ended	60 Months Ended	120 Months Ended
	Oct. 31, 2025	Oct. 31, 2025	Oct. 31, 2025
Institutional
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Dimensional VIT Inflation-Protected Securities Portfolio – Institutional
Average Annual Return, Percent	6.54%	1.59%	3.02%
Bloomberg U.S. Aggregate Bond Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. Aggregate Bond Index
Average Annual Return, Percent	6.16%	(0.24%)	1.90%
Bloomberg U.S. TIPS Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name	Bloomberg U.S. TIPS Index
Average Annual Return, Percent	6.06%	1.63%	3.02%