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Debt - Additional Information (Detail) € / shares in Units, € in Millions, £ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 EUR (€) shares | Dec. 31, 2019 MXN ($) CreditFacility € / shares shares | Dec. 31, 2018 MXN ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 EUR (€) shares | Dec. 31, 2019 GBP (£) shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average cost of borrowed funds |  | 4.16% | 4.31% |  |  |
Commercial paper | $ |  | $ 2,599.1 |  |  |  |
Number of revolving syndicated credit facilities | CreditFacility |  | 2 |  |  |  |
Number of shares delivered | shares |  | 71,063,212,170 |  | 71,063,212,170 | 71,063,212,170 | 71,063,212,170
Investments accounted for using equity method Koninklijke KPN [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Number of shares delivered | shares | 224,695,844 |  |  |  |  |
Percentage of shares outstanding | 5.00% |  |  |  |  |
Nominal outstanding amount of bond | € | € 750 |  |  |  |  |
Sale of share price per share | € / shares |  | $ 3.3374 |  |  |  |
Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | € | € 900 |  |  |  |  |
Borrowings, maturity | 2073 | 2073 |  |  |  |
Revolving Syndicated Credit Facility One [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | $ |  |  |  | $ 2,000 |  |
Borrowings, maturity |  | 2021 |  |  |  |
Revolving Syndicated Credit Facility Two [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | $ |  |  |  | $ 2,500 |  |
Borrowings, maturity |  | 2024 |  |  |  |
Syndicated revolving credit facilities [member] | Telekom Austria [member] | Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | € |  |  |  |  | € 1,000 |
Series One Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | € |  |  |  |  | € 550 |
Borrowings interest rate |  | 6.375% |  | 6.375% | 6.375% | 6.375%
Capital securities beginning redemption period |  | 2023 |  |  |  |
Borrowings, original currency |  | Euros |  |  |  |
Series Two Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | £ |  |  |  |  |  | £ 550
Borrowings interest rate |  | 6.375% |  | 6.375% | 6.375% | 6.375%
Capital securities beginning redemption period |  | 2020 |  |  |  |
Borrowings, original currency |  | Sterling pounds |  |  |  |
Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Percentage of leverage for equity credit |  | 50.00% |  |  |  |
Lines of credit [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Commercial paper | $ |  | $ 53,645.0 | $ 29,651.0 |  |  |
Lines of credit [member] | Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, maturity |  | 2020 | 2019 |  |  |
Borrowings interest rate |  | 0.03% |  | 0.03% | 0.03% | 0.03%
Mexico [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Commissions or the reimbursements for Mexican tax withholdings |  | 4.90% | 4.90% |  |  |

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