Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets:
Assets	$ 378	$ 257
Liabilities:
Derivative instruments	20	101
Fair Value, Recurring
Assets:
Assets	378	257
Total	1,384	1,861
Liabilities:
Derivative instruments	20	101
Mortgage and loans payable	672	684
Senior notes	11,454	11,740
Total	12,146	12,525
Money market and deposit accounts | Fair Value, Recurring
Assets:
Cash and cash equivalents	1,006	1,604
Level 1 | Fair Value, Recurring
Assets:
Assets	0	0
Total	1,006	1,604
Liabilities:
Derivative instruments	0	0
Mortgage and loans payable	0	0
Senior notes	10,935	11,166
Total	10,935	11,166
Level 1 | Money market and deposit accounts | Fair Value, Recurring
Assets:
Cash and cash equivalents	1,006	1,604
Level 2 | Fair Value, Recurring
Assets:
Assets		257
Total	378	257
Liabilities:
Derivative instruments		101
Mortgage and loans payable	672	684
Senior notes	519	574
Total	1,211	1,359
Level 2 | Money market and deposit accounts | Fair Value, Recurring
Assets:
Cash and cash equivalents	$ 0	$ 0