Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Purchase Obligations During the six months ended June 30, 2019, the Company amended an agreement with a wireless network provider, which resulted in a fixed purchase obligation totaling approximately $80 million through 2022. There have been no other material changes to the Company’s purchase obligations outside the ordinary course of business as compared to December 31, 2018. Legal Proceedings The Company is subject to various claims and lawsuits in the ordinary course of business, which include contractual disputes; worker’s compensation; employment matters; product, general, and auto liability claims; claims that the Company has infringed on the intellectual property rights of others; claims related to alleged security system failures; and consumer and employment class actions. The Company is also subject to regulatory and governmental examinations, information requests and subpoenas, inquiries, investigations, and threatened legal actions and proceedings. In connection with such formal and informal inquiries, the Company receives numerous requests, subpoenas, and orders for documents, testimony, and information in connection with various aspects of its activities. The Company records accruals for losses that are probable and reasonably estimable. These accruals are based on a variety of factors such as judgment, probability of loss, opinions of internal and external legal counsel, and actuarially determined estimates of claims incurred but not yet reported based upon historical claims experience. Legal costs in connection with claims and lawsuits in the ordinary course of business are expensed as incurred. Additionally, the Company records insurance recovery receivables from third-party insurers when recovery has been determined to be probable. The Company’s accrual for ongoing claims and lawsuits not within scope of an insurance program was not material and in most cases the Company has not accrued for any losses as the ultimate outcome or the range of possible loss cannot be estimated. The Company’s accrual for ongoing claims and lawsuits within scope of an insurance program totaled $76 million and $74 million as of June 30, 2019 and December 31, 2018, respectively. Environmental Matters In October 2013, an ADT subsidiary was notified by subpoena that the Office of the Attorney General of California, in conjunction with the Alameda County District Attorney, is investigating whether certain of the subsidiary’s electronic waste disposal policies, procedures, and practices are in violation of the California Business and Professions Code and the California Health and Safety Code. During 2016, Protection One was also notified by the same parties that it was subject to a similar investigation. The investigations have been inactive since December 2016 other than a status conference conducted in May 2019. The Company is coordinating joint handling of both investigations and continues to fully cooperate with the respective authorities. Wireless Encryption Litigation The Company is subject to five class action claims regarding wireless encryption in certain ADT security systems. Jurisdictionally, three of the five cases are in Federal Court (in districts within Illinois, Arizona, and California), and both of the remaining two cases are in Florida State Court (both in Palm Beach County Circuit Court). Each of the five plaintiffs brought a claim under the respective state’s consumer fraud statute alleging that The ADT Corporation and each of its consolidated subsidiaries prior to the consummation of the ADT Acquisition made misrepresentations and material omissions in its advertising regarding the unencrypted wireless signal pathways in certain security systems monitored by The ADT Corporation. The complaints in all five cases further allege that certain security systems monitored by The ADT Corporation are not secure because the wireless signal pathways are unencrypted and can be easily hacked. In January 2017, the parties agreed to settle all five class action lawsuits. In October 2017, the U.S. District Court for the Northern District of California entered an order granting preliminary approval of the settlement. Notice to class members was issued in November 2017, and the claim submittal process has been completed. A fairness hearing regarding the settlement was conducted in February 2018, after which trial court stayed the settlement proceedings pending an appellate ruling on a related legal issue. The appellate court issued a ruling in early June 2019, and in July 2019 the trial court entered an order granting final approval of the settlement. Shareholder Litigation Five substantially similar shareholder class action lawsuits related to the January 2018 IPO of ADT Inc. common stock were filed in the Circuit Court of the Fifteenth Judicial Circuit in and for Palm Beach County, Florida in March, April, and May 2018 and have been consolidated for discovery and trial and entitled In re ADT Inc. Shareholder Litigation. The lead plaintiffs seek to represent a class of similarly situated shareholders and assert claims for alleged violations of the Securities Act of 1933, as amended (“Securities Act”). The plaintiffs allege that the Company defendants violated the Securities Act because the registration statement and prospectus used to effectuate the IPO were false and misleading in that they allegedly misled investors with respect to litigation involving the Company, the Company’s efforts to protect its intellectual property, and the competitive pressures faced by the Company. The defendants moved to dismiss the consolidated complaint in October 2018. In July 2019 the Florida state court denied the Company’s motions to dismiss the complaint, but reserved its ruling on the motion to dismiss by the Company’s outside directors and requested further briefing. A similar shareholder class action lawsuit entitled Perdomo v ADT Inc., also related to the January 2018 IPO, was filed in the U.S. District Court for the Southern District of Florida in May 2018, for which the plaintiff filed an Amended Complaint in January 2019 as directed by the Court. The defendants moved to dismiss the Amended Complaint in March 2019. The motions are fully briefed and remain pending before the federal court. California Independent Contractor Litigation In August 2017, Jabra Shuheiber filed civil litigation in Marin County Superior Court on behalf of himself and two other individuals asserting wage and hour violations against the Company. The action is entitled Jabra Shuheiber v. ADT, LLC (Case Number CV 1702912, Superior Court, Marin County). Mr. Shuheiber was the owner/operator of a sub-contractor, Maximum Protection, Inc. (“MPI”), who employed the other two plaintiffs in the litigation. In August 2018, in response to the California Supreme Court’s decision in Dynamex Operations West, Inc. v. Superior Court of Los Angeles County, counsel for Mr. Shuheiber provided the Company with a proposed amended complaint that modified the wage and hour claims such that they were brought on a class basis. The proposed class is not clearly defined but appears to be composed of two groups of individuals: 1) individual owners of sub-contractors who performed services for the sub-contractor; and 2) individuals with no ownership interest in a sub-contractor who were employed by the sub-contractor and provided services pursuant to a contract between the sub-contractor and the Company. In October 2018, the Company answered Plaintiffs First Amended Complaint and filed a Cross-Complaint against Plaintiff’s sub-contracting company for indemnification pursuant to the term of ADT’s sub-contract. Los Angeles Alarm Permit Class Action In June 2013, an ADT subsidiary was served with a class action complaint in California State Court entitled Villegas v. ADT. In this complaint, the plaintiff asserted that the ADT subsidiary violated certain provisions of the California Alarm Act and the Los Angeles Municipal Alarm Ordinance for its alleged failures to obtain alarm permits for its Los Angeles customers and disclose the alarm permit fee in its customer contracts. The plaintiff seeks to recover damages for putative class members who were required to pay enhanced false alarm fines as a result of the ADT subsidiary not obtaining a valid alarm permit at the time of alarm system installation. The case was initially dismissed by the trial court and judgment was entered in the ADT subsidiary’s favor in October 2014, which the plaintiff appealed. In September 2016, the California Appellate Court reversed and remanded the case back to the trial court. In November 2018, the trial court granted the plaintiff’s motion for class certification and certified four subclasses of customers who received fines from the City of Los Angeles on or after May 31, 2010 for a false alarm and for not having an alarm system permit: a pre-March 2009 class of customers installed by the ADT subsidiary; a pre-March 2009 class of customers installed by ADT Authorized Dealers; a post-March 2009 class of customers installed by the ADT subsidiary; and a post-March 2009 class of customers installed by ADT Authorized Dealers. TCPA Telemarketing Class Action On May 13, 2019, ADT was served in a putative Telephone Consumer Protection Act (“TCPA”) class action lawsuit captioned, Mark Fitzhenry v. ADT LLC and Safe Streets USA LLC, filed in the U.S. District Court for the Southern District of Florida. Plaintiff seeks to recover statutory damages allowed under the TCPA on behalf of himself and others similarly situated based on his receipt of a single telemarketing call allegedly made by or on behalf of a third-party ADT authorized dealer. ADT is being defended and indemnified by the authorized dealer. Tax Sharing Agreement On September 28, 2012, Johnson Controls International plc (as successor to Tyco International Ltd., “Tyco”) distributed to its public stockholders The ADT Corporation’s common stock (“Separation from Tyco”), and The ADT Corporation became an independent public company. In connection with the Separation from Tyco, The ADT Corporation entered into a tax sharing agreement (“2012 Tax Sharing Agreement”) that governs the rights and obligations of The ADT Corporation, Tyco, and Pentair Ltd. (formerly Tyco Flow Control International, Ltd., “Pentair”) for certain pre-Separation from Tyco tax liabilities, including Tyco’s obligations under a 2007 tax sharing agreement (“2007 Tax Sharing Agreement”) among Tyco, Covidien (“Covidien”), now operating as a subsidiary of Medtronic, and TE Connectivity Ltd. (“TE Connectivity”). As of June 30, 2019, there have been no material changes to the 2012 Tax Sharing Agreement as compared to December 31, 2018.