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Retirement Benefits (Schedule of Weighted-Average Assumptions) (Details) | 12 Months Ended
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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% |

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