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Commitments and Contingencies Purchase Obligations (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Feb. 28, 2021	Jun. 30, 2021
Radio Conversion Purchase Commitments
Long-term Purchase Commitment [Line Items]
Purchase commitment, amount		$ 55
Customer Contract Purchase Commitments
Long-term Purchase Commitment [Line Items]
Purchase commitment, amount	$ 67

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=adt_RadioConversionPurchaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=adt_CustomerContractPurchaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: