Summary of significant accounting policies (Details) $ in Billions |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2021
USD ($)
segment
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Dec. 31, 2020
USD ($)
|
|
| Accounting Policies [Abstract] | ||
| Number of operating segments | segment | 1 | |
| Accumulated depreciation and amortization on property, plant and equipment | $ | $ 9.2 | $ 9.0 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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