Supplemental Disclosures of Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Supplemental disclosure of cash flow information:
Interest paid during the period	$ 29	$ 45
Income taxes paid during the period, net of refunds	1	1
Non-cash investing and financing activities:
Capital expenditures included in accounts payable and accrued expenses	1	4
Dividends payable on common stock	0	11	$ 11
Recognition of right of use operating lease assets and operating lease liabilities	0	28
Financing of insurance	$ 11	$ 14