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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

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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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: