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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract] |
Schedule of cash flows related to income taxes, interest, construction in process and dividends | Cash flows related to income taxes, interest, construction in process and dividends were as follows:
| Six Months Ended June 30,
| 2018 |  | 2017
| (in millions)
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 | — |  |  | (7 | )
Landlord incentives for leasehold improvements | — |  |  | 1 |
Dividend accrual | 65 |  |  | — |

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