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Segment Reporting - Additional Information (Detail) $ in Millions				6 Months Ended
	Feb. 28, 2025 USD ($)	Dec. 19, 2024 USD ($)	Sep. 19, 2024 USD ($)	Jun. 30, 2025 USD ($) Segment	Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | Segment				3
Total assets				$ 50,222	$ 51,789
Healthcare Services [Member]
Segment Reporting Information [Line Items]
Gain on sale of subsidiaries, net			$ 219
Government Services [Member]
Segment Reporting Information [Line Items]
Gain on sale of subsidiaries, net		$ (28)
Business Processing [Member]
Segment Reporting Information [Line Items]
Total assets				0	103
Business Processing [Member] | Government Services [Member]
Segment Reporting Information [Line Items]
Sale of equity interests in subsidiary	$ 44
Other Segment [Member]
Segment Reporting Information [Line Items]
Total assets				$ 1,200	$ 1,300

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