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Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Retirement Benefits [Line Items] |  |  |
Defined Contribution Plan, Cost | $ 65 | $ 35 | $ 66
Pension Benefits |  |  |
Retirement Benefits [Line Items] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 5 |  |
Large Cap US Equitiies | 100.00% | 100.00% |
Other Postretirement Benefits |  |  |
Retirement Benefits [Line Items] |  |  |
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 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=123447040&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=123450688&loc=d3e4587-114921 + Details
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- Definition Percentage of investment to total investment within defined benefit plan asset category. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&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 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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