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Basis of Presentation and Summary of Significant Accounting Policies Radio Conversion Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended | 48 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2022
Subsequent Event [Line Items] |  |  |  |  |  |
ADT Radio Conversion Revenue | $ 9 | $ 1 | $ 18 | $ 1 |  |
Forecast [Member] | Minimum |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Radio Conversion Cost |  |  |  |  | $ 50 | $ 200
Forecast [Member] | Maximum |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Radio Conversion Cost |  |  |  |  | $ 100 | $ 325

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- Definition Radio Conversion Cost, net + References No definition available. + Details
Name: | adt_RadioConversionCostNet
Namespace Prefix: | adt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Radio Conversion Revenue + References No definition available. + Details
Name: | adt_RadioConversionRevenue
Namespace Prefix: | adt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |