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Intangible assets - Summary of Sensitivity Analysis of Significant Actuarial Assumption (Detail)
Dec. 31, 2024
Dec. 31, 2023
Networks [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates 9.50% 10.00%
Terminal growth rates 2.00% 2.00%
Cloud Software and Services [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates 10.00% 10.50%
Terminal growth rates 1.50% 1.50%
Global Communications Platform [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates 13.50% 11.00%
Terminal growth rates 3.50% 3.50%
Enterprise Wireless Solutions [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates 11.00% 11.00%
Terminal growth rates 3.50% 3.50%
iconectiv [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates   10.50%
Terminal growth rates   3.50%
Emodo [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates   14.50%
Terminal growth rates   2.00%
Red Bee Media [Member]    
Disclosure of information for cash-generating units [line items]    
Post-tax discount rates   12.50%
Terminal growth rates   2.00%