Debt - Schedule of Long-Term Credit Facilities (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024	Feb. 29, 2024
Debt Instrument [Line Items]
Facility Capacity	$ 22,000,000,000
Unused Capacity	11,963,000,000
Principal Amount Outstanding	5,441,000,000
Verizon revolving credit facility
Debt Instrument [Line Items]
Facility Capacity	12,000,000,000		$ 12,000,000,000	$ 9,500,000,000
Unused Capacity	11,963,000,000
Principal Amount Outstanding	0
Amount drawn from credit facilities	0
Various export credit facilities
Debt Instrument [Line Items]
Facility Capacity	10,000,000,000
Unused Capacity	0
Principal Amount Outstanding	5,441,000,000
Amount drawn from credit facilities	$ 0	$ 1,000,000,000