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Retirement Benefits (Schedule of Target Plan Allocation) (Details) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
United States | Equity funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 50.00%
United States | Equity funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 53.00%
United States | Fixed income funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 37.00%
United States | Fixed income funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 40.00%
United States | Real estate funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 1.00%
United States | Real estate funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 1.00%
United States | Other | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 9.00%
United States | Other | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 9.00%
Int’l | Equity funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 1.00%
Int’l | Equity funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 60.00%
Int’l | Fixed income funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 0.00%
Int’l | Fixed income funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 99.00%
Int’l | Hedge funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 0.00%
Int’l | Hedge funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 34.00%
Int’l | Real estate funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 0.00%
Int’l | Real estate funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 10.00%
Int’l | Other | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 0.00%
Int’l | Other | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) |  | 20.00%
Scenario, Forecast | United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 100.00% |
Scenario, Forecast | United States | Equity funds and securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 51.00% |
Scenario, Forecast | United States | Equity funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 41.00% |
Scenario, Forecast | United States | Equity funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 68.00% |
Scenario, Forecast | United States | Fixed income funds and securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 39.00% |
Scenario, Forecast | United States | Fixed income funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 31.00% |
Scenario, Forecast | United States | Fixed income funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 47.00% |
Scenario, Forecast | United States | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 0.00% |
Scenario, Forecast | United States | Real estate funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 1.00% |
Scenario, Forecast | United States | Real estate funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 1.00% |
Scenario, Forecast | United States | Real estate funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 1.00% |
Scenario, Forecast | United States | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 9.00% |
Scenario, Forecast | United States | Other | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 7.00% |
Scenario, Forecast | United States | Other | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 10.00% |
Scenario, Forecast | Int’l |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 100.00% |
Scenario, Forecast | Int’l | Equity funds and securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 22.00% |
Scenario, Forecast | Int’l | Equity funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 1.00% |
Scenario, Forecast | Int’l | Equity funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 50.00% |
Scenario, Forecast | Int’l | Fixed income funds and securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 54.00% |
Scenario, Forecast | Int’l | Fixed income funds and securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 35.00% |
Scenario, Forecast | Int’l | Fixed income funds and securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 100.00% |
Scenario, Forecast | Int’l | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 7.00% |
Scenario, Forecast | Int’l | Hedge funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 0.00% |
Scenario, Forecast | Int’l | Hedge funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 22.00% |
Scenario, Forecast | Int’l | Real estate funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 3.00% |
Scenario, Forecast | Int’l | Real estate funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 0.00% |
Scenario, Forecast | Int’l | Real estate funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 20.00% |
Scenario, Forecast | Int’l | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 14.00% |
Scenario, Forecast | Int’l | Other | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 0.00% |
Scenario, Forecast | Int’l | Other | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations (in percentage) | 42.00% |

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