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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

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