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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Retirement Benefits [Line Items] |  |  |
Defined Contribution Plan, Cost | $ 35 | $ 66 | $ 62
Pension Benefits |  |  |
Retirement Benefits [Line Items] |  |  |
Large Cap US Equitiies | 100.00% | 100.00% |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 6 |  |
Other Postretirement Benefits |  |  |
Retirement Benefits [Line Items] |  |  |
Large Cap US Equitiies | 59.00% | 59.00% |
Fixed Income Securities | 40.00% | 40.00% |
Cash Fund Investments | 1.00% | 1.00% |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 8 |  |
Minimum [Member] | Other Postretirement Benefits | Equity [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage | 25.00% |  |
Minimum [Member] | Other Postretirement Benefits | Fixed Income Investments [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage | 65.00% |  |
Maximum [Member] | Other Postretirement Benefits | Equity [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage | 35.00% |  |
Maximum [Member] | Other Postretirement Benefits | Fixed Income Investments [Member] |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage | 75.00% |  |

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- Definition Percentage of mutual fund that is invested in large-cap U.S. equities. + References No definition available. + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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