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Earnings or Loss Per Share - Potential Diluted Effect of Diluted Loss Per Share (Details) shares in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2026 $ / shares shares	Sep. 30, 2026 shares	Sep. 30, 2025 shares	Sep. 30, 2026 shares	Sep. 30, 2025 shares
Outstanding options, SARs and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)		60.4	38.6	60.4	45.0
Outstanding options, SARs and RSUs \| LILA Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)	17.4
Conversion ratio	1.43
Weighted average exercise price (in dollars per share) \| $ / shares	$ 6.98
Outstanding options, SARs and RSUs \| LILAK Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)	35.7
Weighted average exercise price (in dollars per share) \| $ / shares	$ 6.81
Outstanding PSUs and PSARs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)		11.8	8.5	11.8	8.6
Outstanding PSUs and PSARs \| LILA Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)	3.9
Weighted average exercise price (in dollars per share) \| $ / shares	$ 9.70
Outstanding PSUs and PSARs \| LILAK Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)	7.9
Conversion ratio	1.47
Weighted average exercise price (in dollars per share) \| $ / shares	$ 9.50
LTVP and ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities excluded (in shares)		6.0	5.8	6.0	5.8