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Notes and Contracts Payable (Schedule of Notes and Contracts Payable) (Parenthetical) (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
2.40% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date	Aug. 15, 2031
Fixed interest rate	2.40%
Senior Notes | 2.40% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date		Aug. 15, 2031
Effective interest rate		2.44%
Senior Notes | 4.00% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date		May 15, 2030
Effective interest rate		4.05%
Senior Notes | 4.60% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date		Nov. 15, 2024
Effective interest rate		4.60%
Senior Notes | 4.30% unsecured notes
Debt Instrument [Line Items]
Senior unsecured notes maturity date		Feb. 01, 2023
Effective interest rate		4.35%
Mortgages
Debt Instrument [Line Items]
Maturity year		Nov. 01, 2023
Collateral value		$ 37	$ 38
Fixed interest rate		5.26%
Notes Payable, Other Payables
Debt Instrument [Line Items]
Other notes and contracts payable maturities in year		2024
Weighted-average interest rate		4.21%	4.28%

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