Homebuilding Senior Notes and Other Debts Payable (Narrative) (Details) - Homebuilding - USD ($)	3 Months Ended
	Feb. 28, 2019	Nov. 30, 2018
Debt Instrument [Line Items]
Guarantee by subsidiaries	$ 75,000,000
Surety Bond
Debt Instrument [Line Items]
Outstanding performance and surety bonds	2,900,000,000
Uncompleted site improvements amount	$ 1,400,000,000
Uncompleted site improvements percent	50.00%
Unsecured revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,600,000,000
Accordion feature	315,000,000
Unsecured revolving credit facility | Credit Facility Due in June 2020
Debt Instrument [Line Items]
Maximum borrowing capacity	50,000,000
Unsecured revolving credit facility | Credit Facility Due in June 2022
Debt Instrument [Line Items]
Maximum borrowing capacity	2,200,000,000
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	335,000,000
Performance Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	500,000,000
Letters of credit outstanding	606,000,000.0	$ 598,400,000
Financial Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	153,700,000	165,400,000
Senior Notes
Debt Instrument [Line Items]
Debt issuance cost	$ 29,000,000.0	$ 31,200,000