Goodwill and Other Purchased Intangible Assets Other Purchased Intangible Assets (Details 2) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Acquired Finite-Lived Intangible Assets [Line Items]
Gross customer-related and other intangible assets	$ 3,371	$ 3,365
Less accumulated amortization	(3,117)	(3,060)
Net contract, program and other intangible assets	$ 254	$ 305