Disposition of IT and Mission Support Services (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 30, 2021	Dec. 07, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Group
Accounts receivable, net		$ 110
Unbilled receivables, net		269
Other current assets		9
Property, plant and equipment		14
Operating lease right-of-use assets		38
Goodwill		1,195
Total assets of disposal group held for sale		1,635
Trade accounts payable		(99)
Accrued employee compensation		(59)
Advance payments and billings in excess of costs incurred		(31)
Other current liabilities		(42)
Non-current operating lease liabilities		(27)
Total liabilities of disposal group held for sale		(258)
Disposal Group, Including Discontinued Operation, Consideration				$ 3,400	$ 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	$ 245