Business Combinations (Details) - USD ($)
$ in Millions |
|
1 Months Ended |
3 Months Ended |
7 Months Ended |
10 Months Ended |
12 Months Ended |
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Mar. 09, 2018 |
Dec. 31, 2017 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Sep. 30, 2018 |
Sep. 30, 2018 |
Sep. 30, 2018 |
Dec. 16, 2017 |
Dec. 15, 2017 |
Sep. 30, 2017 |
| Business Acquisition [Line Items] |
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| Goodwill |
|
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$ 2,764
|
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|
$ 2,764
|
$ 2,764
|
$ 2,764
|
$ 2,658
|
$ 2,658
|
$ 3,542
|
| Revenue |
|
$ 148
|
735
|
$ 692
|
$ 672
|
|
2,247
|
|
|
|
|
| Operating income (loss) |
|
$ 2
|
11
|
$ (49)
|
$ (89)
|
|
(125)
|
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| Spoken |
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| Business Acquisition [Line Items] |
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| Purchase price |
$ 172
|
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| Cash considerations |
157
|
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| Contingent consideration |
14
|
|
15
|
|
|
15
|
15
|
15
|
|
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|
| Net payable to company in settlement of contingent consideration |
1
|
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|
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| Goodwill |
122
|
|
$ 116
|
|
|
116
|
116
|
$ 116
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|
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| Decrease in tax liabilities, measurement period adjustments |
|
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$ 4
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| Net liabilities acquired |
8
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| Fair value of intangible assets acquired |
64
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| Acquisition related costs |
3
|
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| Compensation expense related to acquisition |
$ 7
|
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| Revenue |
|
|
|
|
|
|
8
|
|
|
|
|
| Operating income (loss) |
|
|
|
|
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|
$ 31
|
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| Estimate of Fair Value Measurement | Spoken |
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| Business Acquisition [Line Items] |
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| Performance targets |
3
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| Former Owners and Employees | Spoken |
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| Business Acquisition [Line Items] |
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| Contingent consideration |
$ 16
|
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| Spoken Employees | Spoken |
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| Business Acquisition [Line Items] |
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| Contingent consideration |
4
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| Technology-Based Intangible Assets | Spoken |
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| Business Acquisition [Line Items] |
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| Acquired intangible assets |
56
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| Maximum | Technology-Based Intangible Assets | Spoken |
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| Business Acquisition [Line Items] |
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| Acquired intangible assets, weighted average useful life |
|
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4 years 11 months
|
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| In Process Research and Development | Spoken |
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| Business Acquisition [Line Items] |
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| Acquired intangible assets |
5
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| Customer relationships and other intangibles | Spoken |
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| Business Acquisition [Line Items] |
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| Acquired intangible assets |
$ 3
|
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| Acquired intangible assets, weighted average useful life |
|
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7 years 6 months
|
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