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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Supplemental disclosures:
Cash paid for income taxes, net of refunds	$ 31	$ 15
Cash paid for interest	103	106
Non-cash investing and financing activities:
Construction in progress additions included in accounts payable	17	8
Change in accounts payable related to construction in progress additions	9	(5)
Landlord incentives for leasehold improvements	$ 0	$ 1

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Increase (Decrease) in Accounts Payable, Construction in Progress

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Landlord Incentives for Leasehold Improvements

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Future cash outflow to pay for construction in progress expenditures that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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