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Retirement Benefits (Schedule of Weighted-Average Assumptions) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
United States      
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 2.00% 2.89% 3.98%
Expected return on plan assets 5.19% 5.72% 6.09%
Weighted-average assumptions used to determine benefit obligations at measurement date      
Discount rate 2.45% 2.00%  
Int’l      
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 1.40% 2.05% 2.90%
Expected return on plan assets 4.67% 3.70% 5.09%
Weighted-average assumptions used to determine benefit obligations at measurement date      
Discount rate 1.80% 1.40%