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Debt - Credit Facilities, Non-Cash Transaction, Guarantees (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024	Feb. 29, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Facility Capacity	$ 23,000,000,000		$ 23,000,000,000
Unused Capacity	11,962,000,000		11,962,000,000
Principal Amount Outstanding	5,706,000,000		5,706,000,000
Debt extinguishment gains (losses)	90,000,000	$ 85,000,000	289,000,000	$ 224,000,000
Guarantee of Debentures of Operating Telephone Company Subsidiaries
Debt Instrument [Line Items]
Principal amount outstanding in connection with the guarantee of debt obligations	614,000,000		614,000,000
Network Equipment | Alternative Financing Facility
Debt Instrument [Line Items]
Value of purchase assets financed			1,200,000,000	942,000,000
Long-term debt maturing within one year	2,400,000,000		2,400,000,000				$ 2,200,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Facility Capacity	12,000,000,000		12,000,000,000		$ 12,000,000,000	$ 9,500,000,000
Unused Capacity	11,962,000,000		11,962,000,000
Principal Amount Outstanding	0		0
Equipment Credit Facilities
Debt Instrument [Line Items]
Facility Capacity	11,000,000,000		11,000,000,000
Unused Capacity	0		0
Principal Amount Outstanding	$ 5,706,000,000		5,706,000,000
Amount drawn from credit facilities			$ 0	$ 1,000,000,000

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