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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
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