Concentrations of Risk - Schedule of diversification of the Account's portfolio by region and property type (Details) - Geographic Concentration Risk - Portfolio Fair Value or Net Equity Value	3 Months Ended
	Mar. 31, 2022
Office
Concentration Risk [Line Items]
Total	31.00%
Apartment
Concentration Risk [Line Items]
Total	26.50%
Industrial
Concentration Risk [Line Items]
Total	25.30%
Retail
Concentration Risk [Line Items]
Total	12.40%
Other
Concentration Risk [Line Items]
Total	4.80%
Office, Apartment, Industrial, Retail, and Other
Concentration Risk [Line Items]
Total	100.00%
West | Office
Concentration Risk [Line Items]
Total	10.60%
West | Apartment
Concentration Risk [Line Items]
Total	9.00%
West | Industrial
Concentration Risk [Line Items]
Total	15.30%
West | Retail
Concentration Risk [Line Items]
Total	3.90%
West | Other
Concentration Risk [Line Items]
Total	1.30%
West | Office, Apartment, Industrial, Retail, and Other
Concentration Risk [Line Items]
Total	40.10%
South | Office
Concentration Risk [Line Items]
Total	5.70%
South | Apartment
Concentration Risk [Line Items]
Total	9.70%
South | Industrial
Concentration Risk [Line Items]
Total	6.10%
South | Retail
Concentration Risk [Line Items]
Total	5.00%
South | Other
Concentration Risk [Line Items]
Total	2.10%
South | Office, Apartment, Industrial, Retail, and Other
Concentration Risk [Line Items]
Total	28.60%
East | Office
Concentration Risk [Line Items]
Total	14.50%
East | Apartment
Concentration Risk [Line Items]
Total	6.80%
East | Industrial
Concentration Risk [Line Items]
Total	2.40%
East | Retail
Concentration Risk [Line Items]
Total	2.80%
East | Other
Concentration Risk [Line Items]
Total	1.10%
East | Office, Apartment, Industrial, Retail, and Other
Concentration Risk [Line Items]
Total	27.60%
Midwest | Office
Concentration Risk [Line Items]
Total	0.20%
Midwest | Apartment
Concentration Risk [Line Items]
Total	1.00%
Midwest | Industrial
Concentration Risk [Line Items]
Total	1.50%
Midwest | Retail
Concentration Risk [Line Items]
Total	0.70%
Midwest | Other
Concentration Risk [Line Items]
Total	0.20%
Midwest | Office, Apartment, Industrial, Retail, and Other
Concentration Risk [Line Items]
Total	3.60%
Foreign | Office
Concentration Risk [Line Items]
Total	0.00%
Foreign | Apartment
Concentration Risk [Line Items]
Total	0.00%
Foreign | Industrial
Concentration Risk [Line Items]
Total	0.00%
Foreign | Retail
Concentration Risk [Line Items]
Total	0.00%
Foreign | Other
Concentration Risk [Line Items]
Total	0.10%
Foreign | Office, Apartment, Industrial, Retail, and Other
Concentration Risk [Line Items]
Total	0.10%