Goodwill and Other Purchased Intangible Assets Other Purchased Intangible Assets (Details 2) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Gross customer-related and other intangible assets	$ 3,365	$ 3,364
Less accumulated amortization	(3,060)	(2,980)
Net contract, program and other intangible assets	$ 305	$ 384