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Leases (Supplemental Balance Sheet Information Related to Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finance leases:    
Property, plant and equipment $ 28 $ 27
Accumulated depreciation (2) (1)
Property, plant and equipment, net 26 26
Accrued liabilities 2 2
Other non-current liabilities 10 11
Total finance lease liabilities $ 12 $ 13
Weighted average remaining lease term:    
Operating Lease, Weighted Average Remaining Lease Term 9 years 3 months 18 days 9 years 6 months
Finance Lease, Weighted Average Remaining Lease Term 6 years 7 months 6 days 7 years
Weighted average discount rate:    
Operating Lease, Weighted Average Discount Rate, Percent 4.00% 4.20%
Finance Lease, Weighted Average Discount Rate, Percent 3.40% 4.10%