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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Apr. 11, 2018 | Sep. 30, 2016 | Mar. 31, 2018
Commitments and Contingencies Disclosure [Line Items] |  |  |
Purchase commitments, period (up to) |  |  | 150 days
Total future minimum lease payments under noncancelable operating leases |  |  | $ 9,800
Typical term of leases (not exceeding) |  |  | 10 years
Unconditional purchase obligations |  |  | $ 8,300
VirnetX I | Pending litigation |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Award from legal proceeding, due to other party |  | $ 302 |
Award from legal proceeding, due to other party, revised amount, determined in subsequent proceedings |  | $ 440 |
VirnetX II | Pending litigation | Subsequent event |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Award from legal proceeding, due to other party | $ 503 |  |

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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
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- Definition Amount awarded to other party in judgment or settlement of litigation, revised as a result of post-trial or other subsequent proceedings. + References No definition available. + Details
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- Definition Period covered by the short-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P5M13D' represents the reported fact of five months and thirteen days. + References No definition available. + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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