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Pension and Postretirement Benefits (Plan Assets by Percentage Allocation) (Details) | Dec. 31, 2020 | Dec. 31, 2019
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United States | Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 57.00% |
Pension Plan | United States | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 0.00% | 0.00%
Plan assets, actual allocation (as a percent) | 1.00% | 1.00%
Pension Plan | United States | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 43.00% | 43.00%
Plan assets, actual allocation (as a percent) | 43.00% | 40.00%
Pension Plan | United States | Global Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 31.00% | 31.00%
Plan assets, actual allocation (as a percent) | 30.00% | 28.00%
Pension Plan | United States | Global Real Assets |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 12.00% | 12.00%
Plan assets, actual allocation (as a percent) | 13.00% | 12.00%
Pension Plan | United States | Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 57.00% | 57.00%
Plan assets, actual allocation (as a percent) | 56.00% | 59.00%
Pension Plan | United States | Diversified Credit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 12.00% | 12.00%
Plan assets, actual allocation (as a percent) | 14.00% | 12.00%
Pension Plan | United States | Liability Driven Investment |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 45.00% | 45.00%
Plan assets, actual allocation (as a percent) | 42.00% | 47.00%
Pension Plan | Foreign Plan | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 1.00% | 2.00%
Plan assets, actual allocation (as a percent) | 1.00% | 2.00%
Pension Plan | Foreign Plan | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 2.00% | 2.00%
Plan assets, actual allocation (as a percent) | 2.00% | 2.00%
Pension Plan | Foreign Plan | Global Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 1.00% | 1.00%
Plan assets, actual allocation (as a percent) | 1.00% | 1.00%
Pension Plan | Foreign Plan | North American Companies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 1.00% | 1.00%
Plan assets, actual allocation (as a percent) | 1.00% | 1.00%
Pension Plan | Foreign Plan | Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 51.00% | 50.00%
Plan assets, actual allocation (as a percent) | 51.00% | 50.00%
Pension Plan | Foreign Plan | Liability Driven Investment |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 12.00% | 7.00%
Plan assets, actual allocation (as a percent) | 12.00% | 7.00%
Pension Plan | Foreign Plan | U.K. Government Gilt Index |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 39.00% | 43.00%
Plan assets, actual allocation (as a percent) | 39.00% | 43.00%
Pension Plan | Foreign Plan | Other types |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 46.00% | 46.00%
Plan assets, actual allocation (as a percent) | 46.00% | 46.00%
Pension Plan | Foreign Plan | Multi-Asset Category |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 20.00% | 19.00%
Plan assets, actual allocation (as a percent) | 20.00% | 19.00%
Pension Plan | Foreign Plan | Buy-in Contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 20.00% | 21.00%
Plan assets, actual allocation (as a percent) | 20.00% | 21.00%
Pension Plan | Foreign Plan | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets, target allocation (as a percent) | 6.00% | 6.00%
Plan assets, actual allocation (as a percent) | 6.00% | 6.00%

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