Schedule III - Real Estate and Accumulated Depreciation - Change in Accumulated Depreciation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period	$ 2,011	$ 2,004	$ 1,832
Additions during period:
Depreciation expense	256	268	280
Deductions during period:
Transfers to assets held for sale	(24)		(15)
Dispositions, including casualty losses	(206)	(262)	(85)
Foreign exchange effect	1	1	(8)
Balance at end of period	$ 2,038	$ 2,011	$ 2,004