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Segment, Geographic and Other Revenue Information - Narrative (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 Operating_Segment | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) Operating_Segment | Oct. 01, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of business segments | Operating_Segment |  |  |  | 2 |  |
Assets | [1] |  |  | $ 167,838 |  | $ 171,797
Forecast [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of business segments | Operating_Segment |  | 3 |  |  |  |
Adjustment [Member] | Corporate [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Costs |  |  | $ (19) |  | $ (40) |
Adjustment [Member] | IH [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Costs |  |  | (125) |  | (344) |
Adjustment [Member] | EH [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Costs |  |  | $ (36) |  | $ (114) |
[1] | Amounts may not add due to rounding.

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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