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Leases (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Leases [Abstract] |
Operating Lease, Weighted Average Remaining Lease Term | 4 years 7 months 6 days
Lessee Operating And Finance Leases Remaining Lease Terms | 20 years
Operating And Finance Leases, Options To Extend Lease Terms | 20 years
Operating And Finance Leases, Options To Terminate Lease Term | 1 year
Operating Lease, Weighted Average Discount Rate, Percent | 5.20%
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities | $ 39

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