Wireline - Narrative (Details)		3 Months Ended		9 Months Ended
	Sep. 06, 2022 USD ($) whollyOwnedSubsidiary	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Asset Acquisition [Line Items]
Disposal group, pre-tax loss		$ 1,071,000,000	$ 0	$ 1,071,000,000	$ 0
Gain on disposal		(1,071,000,000)	0	(1,071,000,000)	0
Impairment expense		0	0	477,000,000	0
Sprint
Asset Acquisition [Line Items]
Impairment expense			$ 0	477,000,000	$ 0
Loss on disposal group held for sale				258,000,000
Operating lease, impairment loss				212,000,000
Impairment of other intangible assets				7,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wireline Business
Asset Acquisition [Line Items]
Number of subsidiaries owned | whollyOwnedSubsidiary	2
Purchase price in consideration for the purchased interests	$ 1
Transaction fees payable	700,000,000
Monthly installments due in year one	350,000,000
Monthly installments due thereafter	$ 350,000,000
Monthly installments (in period)	42 months
Disposal group, pre-tax loss				(121,000,000)
Gain on disposal				121,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wireline Business | Other current liabilities
Asset Acquisition [Line Items]
Disposal group, fees payable		29,000,000		29,000,000
Disposal group, liabilities payable		24,000,000		24,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Wireline Business | Other long-term liabilities
Asset Acquisition [Line Items]
Disposal group, fees payable		613,000,000		613,000,000
Disposal group, liabilities payable		$ 35,000,000		$ 35,000,000