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Leases (Narrative) (Details)
$ in Millions
 3 Months Ended
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