v3.5.0.1

Basis of Presentation and Summary of Significant Accounting Policies (Schedule of Subscriber System Assets Depreciation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 27, 2015	Mar. 31, 2016	Mar. 27, 2015
Subscriber System Assets Depreciation Expense [Line Items]
Depreciation	$ 120	$ 107	$ 237	$ 211

X

- Definition

[Line Items] for Subscriber System Assets Depreciation Expense [Table]

+ References

No definition available.

+ Details

Name:	adt_SubscriberSystemAssetsDepreciationExpenseLineItems
Namespace Prefix:	adt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration