v3.5.0.1

Acquisitions (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2016	Mar. 27, 2015
Business Combinations [Abstract]
Payments For Dealer Generated Customer Accounts And Non Dealer Bulk Account Purchases	$ 282	$ 267

X

- Definition

The cash outflow associated with the purchase of customer accounts from third parties.

+ References

No definition available.

+ Details

Name:	adt_PaymentsForDealerGeneratedCustomerAccountsAndNonDealerBulkAccountPurchases
Namespace Prefix:	adt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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