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Balance Sheet Components - Schedule of Carrying Amount of Goodwill by Geographical Regions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 5,737	$ 5,654	$ 5,372
Impact of foreign currency exchange	(233)	83	(256)
Goodwill, ending balance	5,504	5,737	5,654
MainOne
Goodwill [Roll Forward]
Goodwill, beginning balance	111
Goodwill acquired during the period			111
Goodwill, ending balance		111
Entel Chile
Goodwill [Roll Forward]
Goodwill, beginning balance	381
Goodwill acquired during the period			381
Goodwill, ending balance		381
Entel Peru
Goodwill [Roll Forward]
Goodwill, beginning balance	46
Goodwill acquired during the period			46
Goodwill, ending balance		46
Americas
Goodwill [Roll Forward]
Goodwill, beginning balance	2,631	2,631	2,210
Impact of foreign currency exchange	(72)	0	(6)
Goodwill, ending balance	2,559	2,631	2,631
Americas \| MainOne
Goodwill [Roll Forward]
Goodwill acquired during the period			0
Americas \| Entel Chile
Goodwill [Roll Forward]
Goodwill acquired during the period			381
Americas \| Entel Peru
Goodwill [Roll Forward]
Goodwill acquired during the period			46
EMEA
Goodwill [Roll Forward]
Goodwill, beginning balance	2,467	2,378	2,473
Impact of foreign currency exchange	(118)	89	(206)
Goodwill, ending balance	2,349	2,467	2,378
EMEA \| MainOne
Goodwill [Roll Forward]
Goodwill acquired during the period			111
EMEA \| Entel Chile
Goodwill [Roll Forward]
Goodwill acquired during the period			0
EMEA \| Entel Peru
Goodwill [Roll Forward]
Goodwill acquired during the period			0
Asia-Pacific
Goodwill [Roll Forward]
Goodwill, beginning balance	639	645	689
Impact of foreign currency exchange	(43)	(6)	(44)
Goodwill, ending balance	$ 596	$ 639	645
Asia-Pacific \| MainOne
Goodwill [Roll Forward]
Goodwill acquired during the period			0
Asia-Pacific \| Entel Chile
Goodwill [Roll Forward]
Goodwill acquired during the period			0
Asia-Pacific \| Entel Peru
Goodwill [Roll Forward]
Goodwill acquired during the period			$ 0