Supplemental Balance Sheet Detail - Components of Supplemental Balance Sheet Detail (Parenthetical) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Balance Sheet Detail [Line Items]
Other	[1]	$ 285	$ 174
Accrued Liabilities [Member]
Supplemental Balance Sheet Detail [Line Items]
Other		129	17
Marine Vessels [Member]
Supplemental Balance Sheet Detail [Line Items]
Depreciation expense		$ 128	$ 115	$ 93
Maximum [Member]
Supplemental Balance Sheet Detail [Line Items]
Percentage of total current liabilities		5.00%

[1] Includes $129 million in 2019 and $17 million in 2018 associated with accrued liabilities incurred in connection with the Amazon Modification Agreements, as defined in Note 14, Lease Obligations.