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Subsequent Events (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended			6 Months Ended
	Aug. 01, 2025 USD ($) numberOfTowers $ / shares	Jul. 14, 2025 USD ($)	Aug. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Aug. 04, 2025 USD ($)	Dec. 31, 2024 USD ($)
Subsequent Event [Line Items]
Purchase price							$ 10
Income tax expense (benefit)					$ 4	$ 14	24	$ 41
Accrued taxes					37		37			$ 30
Interest Expense					45	$ 45	84	$ 91
Wireless operations
Subsequent Event [Line Items]
Net Assets					$ 2,400		$ 2,400
Subsequent event
Subsequent Event [Line Items]
Purchase price		$ 17
Purchase price paid at time of close		$ 7
Income tax expense (benefit)				$ (50)
Cash received from divestitures	$ 2,629
Interest Expense				$ 48
Lessor, Operating Lease, Term of Contract	15 years
Minimum Number Of Towers Retained | numberOfTowers	2,015
NumberOfTowersToBeExtendedTenancyTerm | numberOfTowers	600
Subsequent event | Senior Notes
Subsequent Event [Line Items]
Long-term debt	$ 364
Subsequent event | Series A Common Shares
Subsequent Event [Line Items]
Special dividend | $ / shares	$ 23.00
Subsequent event | Common Shares
Subsequent Event [Line Items]
Special dividend | $ / shares	$ 23.00
Subsequent event | Array Term Loan Agreements
Subsequent Event [Line Items]
Amount borrowed during the period			$ 325
Subsequent event | Array Term Loan and Export Credit Financing Agreements
Subsequent Event [Line Items]
Amount repaid									$ 863
Subsequent event | Contingent consideration
Subsequent Event [Line Items]
Business divestiture agreement amount	$ 89
Subsequent event | Debt Exchange
Subsequent Event [Line Items]
Long-term debt	1,680
Subsequent event | 6.7% Senior Notes
Subsequent Event [Line Items]
Long-term debt	55
Subsequent event | 6.7% Senior Notes | Debt Exchange
Subsequent Event [Line Items]
Long-term debt	$ 489
Interest rate	6.70%
Subsequent event | 6.25% Senior Notes
Subsequent Event [Line Items]
Long-term debt	$ 106
Subsequent event | 6.25% Senior Notes | Debt Exchange
Subsequent Event [Line Items]
Long-term debt	$ 394
Interest rate	6.25%
Subsequent event | 5.5% March 2070 Senior Notes
Subsequent Event [Line Items]
Long-term debt	$ 98
Subsequent event | 5.5% March 2070 Senior Notes | Debt Exchange
Subsequent Event [Line Items]
Long-term debt	$ 402
Interest rate	5.50%
Subsequent event | 5.5% June 2070 Senior Notes
Subsequent Event [Line Items]
Long-term debt	$ 105
Subsequent event | 5.5% June 2070 Senior Notes | Debt Exchange
Subsequent Event [Line Items]
Long-term debt	$ 395
Interest rate	5.50%
Subsequent event | Minimum
Subsequent Event [Line Items]
Accrued taxes	$ 250
Subsequent event | Maximum
Subsequent Event [Line Items]
Accrued taxes	$ 300

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