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Other Assets and Liabilities - Additional Information (Details) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2024 USD ($) transaction partnership	Dec. 31, 2023 transaction	Sep. 30, 2021 transaction	Dec. 31, 2023 transaction	Dec. 31, 2021 transaction	Dec. 31, 2018 partnership
Other Assets and Other Liabilities [Line Items]
Number of partnerships consolidated \| partnership	2					2
Co-investors gains (losses)	$ 1
Number of securitization transactions co-sponsored \| transaction	2	2	2	2	2
Co-Investors Interests
Other Assets and Other Liabilities [Line Items]
Carrying value of interests	$ 22
HEI Securitization Non-Controlling Interest
Other Assets and Other Liabilities [Line Items]
Carrying value of interests	65
Co-investors gains (losses)	$ 5