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Operating and Reporting Segments (Narrative) (Details) - USD ($)
shares in Millions
3 Months Ended 6 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Financial Services | Warehouse Repurchase Facility        
Segment Reporting Information [Line Items]        
Collateral percentage 80.00%   80.00%  
Lennar Other | Level 3 | Discount rate        
Segment Reporting Information [Line Items]        
Discontinued operation, equity consideration, measurement input 0.15   0.15  
Lennar Other | Opendoor        
Segment Reporting Information [Line Items]        
Lennar Other realized and unrealized gain (loss) $ (234,300,000)      
Lennar Other | Sunnova Energy International Inc.        
Segment Reporting Information [Line Items]        
Lennar Other realized and unrealized gain (loss) (38,300,000)      
Lennar Other | Sunnova Energy International Inc. | Disposal Group, Held-for-sale, Not Discontinued Operations        
Segment Reporting Information [Line Items]        
Gain on sale $ 151,500,000      
Number of shares received upon closing (in shares) 3.1      
CMBS | Financial Services        
Segment Reporting Information [Line Items]        
Impairment charges for CMBS securities $ 0 $ 0 $ 0 $ 0