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Acquisitions (Schedule of Intangible Assets Acquired) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 20, 2021 | Oct. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Customer relationships |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Amortization Period (in years) |  |  | 14 years | 15 years
Frazer-Nash Consultancy Limited |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair Value | $ 89 |  |  |
Weighted Average Amortization Period (in years) | 14 years |  |  |
Frazer-Nash Consultancy Limited | Backlog |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair Value | $ 10 |  |  |
Weighted Average Amortization Period (in years) | 1 year |  |  |
Frazer-Nash Consultancy Limited | Customer relationships |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair Value | $ 79 |  |  |
Weighted Average Amortization Period (in years) | 16 years |  |  |
Centauri L L C |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair Value |  | $ 226 |  |
Weighted Average Amortization Period (in years) |  | 13 years |  |
Centauri L L C | Backlog |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair Value |  | $ 28 |  |
Weighted Average Amortization Period (in years) |  | 1 year |  |
Centauri L L C | Customer relationships |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair Value |  | $ 198 |  |
Weighted Average Amortization Period (in years) |  | 15 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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