Business Combination - Schedule of Fair Values of the Identified Intangible Assets and their Useful Lives (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Intangible assets, Fair Value	$ 510	$ 406
Maxwell Technologies, Inc. [Member]
Business Acquisition [Line Items]
Intangible assets, Fair Value	105
Developed technology [Member] \| Maxwell Technologies, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, Fair Value	$ 102
Useful Life (in years)	9 years
Customer relations [Member] \| Maxwell Technologies, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, Fair Value	$ 2
Useful Life (in years)	9 years
Trade names [Member] \| Maxwell Technologies, Inc. [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, Fair Value	$ 1
Useful Life (in years)	10 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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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.

+ References

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- Definition

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

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