Disposition of IT and Mission Support Services (Details 1) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Jan. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Group
Disposal Group, Including Discontinued Operation, Consideration			$ 3,400
Pre-tax gain on sale of business	$ 2,000
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, Attributable to Parent, before Income Tax	$ 20	$ 247

Amount before tax of income (loss) from an individually significant component disposed of or held-for-sale attributable to parent. Excludes discontinued operations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration