Provision (Benefit) for Income Taxes - Significant Components of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax liabilities:
Properties and equipment	$ 938	$ 797
Deferred tax liabilities, Derivatives, net	0	33
Deferred Tax Liabilities, Gross	938	830
Deferred tax assets:
Accrued liabilities and other	156	137
Alternative minimum tax credits	21	40
Loss carryovers	682	665
Deferred tax assets, Derivatives, net	5	0
Total deferred tax assets	864	842
Less: valuation allowance	216	213
Total net deferred tax assets	648	629
Deferred Tax Liabilities, Net	$ 290	$ 201