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Notes and Contracts Payable (Schedule of Notes and Contracts Payable) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Aug. 31, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |  |
Trust deed note due November 1, 2023, collateralized by land and buildings with net book values of $37 and $38 at December 31, 2021 and 2020, respectively, fixed interest rate of 5.26% | $ 8 |  | $ 12
Other notes and contracts payable with maturities through 2024, weighted-average interest rates of 4.21% and 4.28% at December 31, 2021 and 2020, respectively | 4 |  | 6
Debt And Capital Lease Obligations Before Discounts Premiums Debt Issuance Costs | 1,662 |  | 1,018
Unamortized discounts and debt issuance costs | (14) |  | (7)
Notes and contracts payable net of unamortized discount and debt issuance costs | 1,648 |  | 1,011
2.40% unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes | 650 | $ 650 | 0
4.00% unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes | 450 |  | 450
4.60% unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes | 300 |  | 300
4.30% unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes | $ 250 |  | $ 250

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