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Commitments and Contingencies (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Indefinite-lived trademarks | $			$ 987,000,000
Obligations Under Tax Agreements
Loss Contingencies [Line Items]
Obligations included in liabilities | $	$ 2,000,000	$ 2,000,000
Wireless Encryption Litigation
Loss Contingencies [Line Items]
Number of claims	5
Wireless Encryption Litigation, Federal
Loss Contingencies [Line Items]
Number of claims	3
Wireless Encryption Litigation, State
Loss Contingencies [Line Items]
Number of claims	2
Shareholder Litigation
Loss Contingencies [Line Items]
Number of claims	5
Tyco International
Loss Contingencies [Line Items]
Liability threshold | $	$ 500,000,000
Tax liability sharing percent	27.00%

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- Definition

This represents the liability threshold under a tax sharing agreement.

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- Definition

The percentage of the tax liability that will be borne by the participating entity of a tax sharing agreement.

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- Definition

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- 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.

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- Definition

Number of pending claims pertaining to a loss contingency.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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