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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Supplemental disclosures:    
Cash paid for income taxes, net of refunds $ 13 $ 10
Cash paid for interest 55 56
Non-cash investing and financing activities:    
Construction in progress additions included in accounts payable 10 8
Change in accounts payable related to construction in progress additions 2 9
Landlord incentives for leasehold improvements $ 0 $ 1