Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 208	$ 271	$ 222	$ 289
Costs incurred	45	43	129	132
Amortization	(49)	(51)	(150)	(158)
Change in contract costs held for sale	3	(35)	6	(35)
End of period balance	207	228	207	228
Acquisition Costs | Held-for-sale
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	31		34
End of period balance		35		35
Acquisition Costs | Held-for-sale | ILEC Business
Capitalized Contract Cost [Roll Forward]
End of period balance	28		28
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	188	217	186	216
Costs incurred	38	37	119	112
Amortization	(35)	(37)	(113)	(111)
Change in contract costs held for sale	(2)	(31)	(3)	(31)
End of period balance	189	186	189	186
Fulfillment Costs | Held-for-sale
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	33		32
End of period balance		$ 31		$ 31
Fulfillment Costs | Held-for-sale | ILEC Business
Capitalized Contract Cost [Roll Forward]
End of period balance	$ 35		$ 35