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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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