Background (Details)	3 Months Ended	24 Months Ended
	Mar. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) divestiture	Jan. 01, 2024	Mar. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)	Oct. 03, 2022 state
Change in Accounting Estimate [Line Items]
Number of business divestitures | divestiture		3
Accumulated deficit	$ (17,850,000,000)	$ (17,907,000,000)
Book overdraft balance	0	$ 0
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | ILEC Business
Change in Accounting Estimate [Line Items]
Number of states in which the business is conducted | state						20
Change in Accounting Method Accounted for as Change in Estimate
Change in Accounting Estimate [Line Items]
Depreciation	(16,000,000)
Depreciation, net of tax	$ (12,000,000)
Diluted earnings per common share (in dollars per share) | $ / shares	$ 0.01
Fiber Network Assets
Change in Accounting Estimate [Line Items]
Property, plant and equipment,useful life (in years)		25 years	30 years
Correction of Error from Understatement of Revenues and Network Expenses Prior to 2021
Change in Accounting Estimate [Line Items]
Accumulated deficit				$ (63,000,000)	$ (63,000,000)