Goodwill and Other Purchased Intangible Assets Other Purchased Intangible Assets (Details 2) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Intangible Asset, Acquired, Finite-Lived [Line Items]
Gross customer-related and other intangible assets	$ 3,372	$ 3,371
Less accumulated amortization	(3,164)	(3,117)
Net contract, program and other intangible assets	$ 208	$ 254