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Leases (Schedule of Additional Lease Information) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Cash outflows for lease liabilities:    
Operating cash flows, Finance lease $ 1 $ 3
Weighted average remaining lease term (years), Finance lease 8 years 6 months 8 years 6 months
Weighted average discount rate, Finance lease 4.20% 4.20%
Operating cash flows, Operating lease   $ 1
Investing cash flows, Operating lease $ 12 27
Right-of-use assets obtained in exchange for new lease liabilities, Operating lease $ 1 $ 1
Weighted average remaining lease term (years), Operating lease 1 year 10 months 24 days 1 year 10 months 24 days
Weighted average discount rate, Operating lease 3.20% 3.20%