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Equity Share Repurchase (Policies) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Share Repurchase and Retirement [Policy Text Block] | During February 2019, the Company approved a share repurchase program (the “Share Repurchase Program”), which authorized the Company to repurchase shares of the Company’s Common Stock (up to a certain amount). The Share Repurchase Program terminated in accordance with its terms on March 23, 2021.

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- Definition Share Repurchase and Retirement [Policy Text Block] + References No definition available. + Details
Name: | adt_ShareRepurchaseandRetirementPolicyTextBlock
Namespace Prefix: | adt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration