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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

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+ References

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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

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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
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