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Real Estate and Other Activities - Alecto Facilities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Business Acquisition [Line Items]        
Real estate impairment charges $ 225 $ 79 $ 180  
Total Gross Assets [Member] | Customer Concentration Risk [Member]        
Business Acquisition [Line Items]        
Percentage of total assets [1]     100.00% 100.00%
[1] For geographic and facility type concentration metrics in the tables above, we allocate our investments in unconsolidated operating entities pro rata based on the gross book value of the real estate. Such pro rata allocations are subject to change from period to period.