Segment and Related Information - Schedule of Segment Reporting Information to Consolidated Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Assets By Segment [Line Items]
Consolidated assets	$ 14,631	$ 16,132
Cash and cash equivalents	879	1,113
Corporate fixed assets, net	7,916	8,327
Corporate goodwill	150	151
Deferred income taxes	410
Operating Segments [Member]
Schedule Of Assets By Segment [Line Items]
Consolidated assets	12,325	13,806
Intersegment Eliminations [Member]
Schedule Of Assets By Segment [Line Items]
Elimination of intersegment receivables	(170)	(271)
Other [Member]
Schedule Of Assets By Segment [Line Items]
Cash and cash equivalents	879	1,113
Corporate fixed assets, net	519	520
Corporate goodwill	145	146
Deferred income taxes	642	560
Other	$ 291	$ 258