Goodwill and Other Purchased Intangible Assets Other Purchased Intangible Assets (Details 2) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Gross customer-related and other intangible assets	$ 3,364	$ 3,361
Less accumulated amortization	(2,980)	(2,783)
Net contract, program and other intangible assets	$ 384	$ 578