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Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Millions | Mar. 17, 2025 $ / shares | Feb. 10, 2025 USD ($) PROPERTY | Feb. 07, 2025 USD ($) shares
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Common Class A [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Dividends declared | $ / shares | $ 0.38 |  |
Common Class A [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Dividends declared | $ / shares | 0.38 |  |
Common Class B [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Dividends declared | $ / shares | 0.38 |  |
Common Class B [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Dividends declared | $ / shares | $ 0.38 |  |
Rausch Coleman Homes [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of homesites | PROPERTY |  | 24,000 |
Percentage of interest acquired |  | 100.00% |
Cash payment received from acquisition |  | $ 876 |
Rausch Coleman Homes [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of homesites | PROPERTY |  | 24,000 |
Percentage of interest acquired |  | 100.00% |
Cash payment received from acquisition |  | $ 876 |
Lennar Corporation [Member] | Common Stock [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of ownership interest after disposal |  |  | 20.00%
Lennar Corporation [Member] | Common Stock [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of ownership interest after disposal |  |  | 20.00%
Lennar Corporation [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of ownership interest sold |  |  | 80.00%
Lennar Corporation [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of ownership interest sold |  |  | 80.00%
Land assets |  |  | $ 5,500
Cash |  |  | 1,000
Lennar Corporation [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Land assets |  |  | 5,500
Cash |  |  | $ 1,000
Lennar Corporation [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Common Class A [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Retained shares | shares |  |  | 33,200,053
Lennar Corporation [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Common Class A [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Retained shares | shares |  |  | 33,200,053
Lennar Corporation [Member] | February 7, 2028 | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Commitment amount |  |  | $ 1,335
Maturity date |  |  | Feb. 07, 2028
Lennar Corporation [Member] | February 7, 2028 | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Commitment amount |  |  | $ 1,335
Maturity date |  |  | Feb. 07, 2028
Lennar Corporation [Member] | March 25, 2025 | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Commitment amount |  |  | $ 450
Maturity date |  |  | Mar. 25, 2025
Lennar Corporation [Member] | March 25, 2025 | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] | PREDECESSOR MILLROSE BUSINESS [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Commitment amount |  |  | $ 450
Maturity date |  |  | Mar. 25, 2025

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