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Notes Payable - Terms (Details) - Home Building Consolidated - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021	Oct. 31, 2020
Senior Note Member Twenty Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 350
Debt Instrument, Maturity Date		Sep. 15, 2022
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		4.50%
Senior notes, stated interest rate		4.375%
Senior Note Twenty Seven [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 300
Debt Instrument, Maturity Date		Feb. 15, 2023
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		4.90%
Senior notes, stated interest rate		4.75%
SeniorNoteTwentyEight [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 400
Debt Instrument, Maturity Date		Aug. 15, 2023
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		5.90%
Senior notes, stated interest rate		5.75%
SeniorNoteFortyTwo [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500	$ 500
Debt Instrument, Maturity Date	Oct. 15, 2027	Oct. 15, 2024
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		2.70%	1.60%
Senior notes, stated interest rate		2.50%	1.40%
SeniorNoteFortyFour
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500
Debt Instrument, Maturity Date		Oct. 15, 2025
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		2.80%
Senior notes, stated interest rate		2.60%
SeniorNoteFortySIx
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 600
Debt Instrument, Maturity Date		Oct. 15, 2026
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		1.50%
Senior notes, stated interest rate		1.30%
Senior Note Forty Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500
Debt Instrument, Maturity Date		Oct. 15, 2027
Debt Instrument, Call Feature		Yes
Debt Instrument, Interest Rate, Effective Percentage		1.60%
Senior notes, stated interest rate		1.40%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%

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