Discontinued Operations - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 12, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair value consideration		$ 46	$ 37
Divested Business | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total consideration	$ 1,200
Proceeds from divestiture of businesses	1,000
Aggregate principal amount, consideration	50
Aggregate principal amount, contingent consideration	150
Fair value contingent consideration	$ 43
Stated interest rate	8.00%
Initial period	18 months
Option to extend	6 months
Transition services agreement	$ 15
TSA services income		26	19
Pass-through costs		35	42
Revenue		42	577	$ 1,024
Gain (loss) on sale		(9)	(10)	0
Cost of services, exclusive of depreciation and amortization		42	425	684
Income tax expense (benefit)		12	59	16
Divested Business | Discontinued Operations, Disposed of by Sale | Customer Care Commercial Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		44	23
Divested Business | Discontinued Operations, Disposed of by Sale | Cloud Services Segments
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncash goodwill impairment charge				$ 148
Cost of services, exclusive of depreciation and amortization		$ 42	71
Income tax expense (benefit)			$ 41
Divested Business | Discontinued Operations, Disposed of by Sale | Fair Value
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair value consideration	$ 35