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Intangible assets -Summary of Sensitivity Analysis of Significant Actuarial Assumption (Detail) | Dec. 31, 2023 | Dec. 31, 2022
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Networks [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax discount rates | 10.00% | 9.00%
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 | 10.50% | 10.00%
Terminal growth rates | 1.50% | 2.00%
Vonage [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax discount rates | 11.00% | 9.50%
Terminal growth rates | 3.50% | 3.50%
Cradlepoint [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax discount rates | 11.00% | 9.50%
Terminal growth rates | 3.50% | 2.00%
iconectiv [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax discount rates | 10.50% | 10.00%
Terminal growth rates | 3.50% | 2.00%
Emodo [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax discount rates | 14.50% | 14.50%
Terminal growth rates | 2.00% | 2.00%
Red Bee Media [Member] |  |
Disclosure of information for cash-generating units [line items] |  |
Post-tax discount rates | 12.50% | 11.00%
Terminal growth rates | 2.00% | 2.00%

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