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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental disclosures:    
Cash paid for income taxes, net of refunds $ 8 $ 10
Cash paid for interest 52 53
Non-cash investing and financing activities:    
Construction in progress additions included in accounts payable 8 9
Change in accounts payable related to construction in progress additions 0 (7)
Landlord incentives for leasehold improvements 0 1
Dividend accrual $ 65 $ 0