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Divestiture - Additional Information (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Feb. 28, 2025	Dec. 19, 2024	Sep. 19, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Goodwill [Line Items]
Goodwill and acquired intangible assets				$ 436		$ 436		$ 437
Business Processing [Member]
Goodwill [Line Items]
Revenue					$ 81		$ 158
Business Processing [Member] | Federal Government [Member]
Goodwill [Line Items]
Revenue					14	4	29
Business Processing [Member] | State and Local Government [Member]
Goodwill [Line Items]
Revenue					18	8	35
Business Processing [Member] | Tolling Authorities [Member]
Goodwill [Line Items]
Revenue					17	11	33
Government Services [Member]
Goodwill [Line Items]
Gain (loss) on sale of subsidiaries, net		$ (28)
Government Services [Member] | Business Processing [Member]
Goodwill [Line Items]
Sale of equity interests in subsidiary	$ 44
Revenue				$ 0	49	$ 23	97
Healthcare Services [Member]
Goodwill [Line Items]
Goodwill and acquired intangible assets			$ 112
Gain (loss) on sale of subsidiaries, net			$ 219
Healthcare Services [Member] | Business Processing [Member]
Goodwill [Line Items]
Revenue					$ 32		$ 61

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