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Retirement Benefits (Schedule of Weighted-Average Assumptions) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
United States      
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 3.98% 3.33% 3.73%
Expected return on plan assets 6.09% 6.01% 6.01%
Weighted-average assumptions used to determine benefit obligations at measurement date      
Discount rate 2.89% 3.98%  
Int’l      
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 2.90% 2.50% 2.60%
Expected return on plan assets 5.09% 5.20% 5.40%
Weighted-average assumptions used to determine benefit obligations at measurement date      
Discount rate 2.05% 2.90%