Revenue Recognition - Schedule of Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Held-for-sale | Latin American Business and ILEC Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance		$ 32
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 192	215	$ 202	$ 222
Costs incurred	29	41	65	84
Amortization	(39)	(49)	(80)	(101)
Change in contract costs held for sale	1	1	(4)	3
End of period balance	183	208	183	208
Acquisition Costs | Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	11		6
End of period balance	10		10
Acquisition Costs | Held-for-sale | Latin American Business and ILEC Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance				32
End of period balance		33		33
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	182	187	192	186
Costs incurred	39	41	79	81
Amortization	(36)	(39)	(71)	(78)
Change in contract costs held for sale	1	(1)	(14)	(1)
End of period balance	186	188	186	188
Fulfillment Costs | Held-for-sale, Not Discontinued Operations | EMEA Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	15		0
End of period balance	$ 14		$ 14
Fulfillment Costs | Held-for-sale | Latin American Business and ILEC Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance				34
End of period balance		$ 31		$ 31