Fair Value Measurements and the Fair Value Option - Schedule of Significant Inputs (Details)	Sep. 30, 2022
Capitalization Rates | Multifamily | Minimum | Valuation Technique, Direct Capitalization
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0370
Capitalization Rates | Multifamily | Minimum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0500
Capitalization Rates | Multifamily | Maximum | Valuation Technique, Direct Capitalization
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0540
Capitalization Rates | Multifamily | Maximum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0700
Capitalization Rates | Office | Minimum | Valuation Technique, Direct Capitalization
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0390
Capitalization Rates | Office | Minimum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0520
Capitalization Rates | Office | Maximum | Valuation Technique, Direct Capitalization
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0790
Capitalization Rates | Office | Maximum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0750
Capitalization Rates | Industrial Property | Minimum | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0480
Capitalization Rates | Industrial Property | Minimum | Valuation Technique, Direct Capitalization
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0310
Capitalization Rates | Industrial Property | Maximum | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0630
Capitalization Rates | Industrial Property | Maximum | Valuation Technique, Direct Capitalization
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0630
Capitalization Rates | Retail | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0650
Capitalization Rates | Hotel | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0600
Capitalization Rates | Residential | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0600
Discount Rates | Multifamily | Minimum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0720
Discount Rates | Multifamily | Maximum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0930
Discount Rates | Office | Minimum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0750
Discount Rates | Office | Maximum | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0930
Discount Rates | Industrial Property | Minimum | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0630
Discount Rates | Industrial Property | Maximum | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0780
Discount Rates | Retail | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0830
Discount Rates | Hotel | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0830
Discount Rates | Residential | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0830
Measurement Input, Credit Spread | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0037
Measurement Input, Credit Spread | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement inputs	0.0725