Nature of Operations and Basis of Presentation - Narrative (Details) $ in Millions		5 Months Ended	6 Months Ended
	Apr. 29, 2025	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2025 USD ($) Segment	Apr. 14, 2025	Dec. 31, 2024 USD ($)
Business Combination [Line Items]
Number of reportable segments				5	5
Restricted cash			$ 0	$ 0	$ 0		$ 0
Contract asset			98	98	98		69
Unearned revenue			2,500
Capitalized contract costs			$ 324	$ 324	$ 324		$ 291
Minimum
Business Combination [Line Items]
Amortization period of capitalized contract cost			2 years	2 years	2 years
Maximum
Business Combination [Line Items]
Amortization period of capitalized contract cost			5 years	5 years	5 years
Scenario, Plan | Minimum | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff
Business Combination [Line Items]
Expected term of completion for spinoff transaction	12 months
Scenario, Plan | Maximum | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff
Business Combination [Line Items]
Expected term of completion for spinoff transaction	18 months
Forecast
Business Combination [Line Items]
Total enterprise value		$ 3,100
OSTTRA | Forecast
Business Combination [Line Items]
Pre-tax gain on sale		220
Gain on sale after tax		$ 140
OSTTRA | Corporate Joint Venture
Business Combination [Line Items]
Investment in joint venture percentage			50.00%	50.00%	50.00%	50.00%
Noncontrolling interest ownership by noncontrolling owners percentage			50.00%	50.00%	50.00%	50.00%